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#8787530 - 09/12/16 08:57 AM New Milk Thread and Track day update :D
4age Offline
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Been probably 6 months now. I got a 328 Touring.
Most boring version possible: premium trim, automatic and xdrive.
For Canada, we never got the rwd wagon, so xdrive was the only choice. And for me, the primary purpose of this car was to haul my bike gear + wife to bike races in comfort with plenty of room to spare. This car does that in spades \:D

The original car out of the box didn't drive all that well - tons of feel through the steering, and the motor is a darn peach. But the car has loaded with a bunch of fun sapping features that BMW baked into the xdrive setup. This like BMW variably boosting brake pressure depending on the speed you are going and amount of pedal travel used in the brake. This made for inconsistent braking and the pedal firming up at different spots in the range of travel depending on what speed you hit the brakes at.

It also tries hard to vector power from front to rear axles multiple times in a corner when you're getting the car loose. The transfer case simply bangs the clutch and it makes for abrupt power transfer - the car shifts front and rear each time the clutches are hit. It's like a mild clutch kick. really bad. That and it had brake vectoring and reduces engine power when it calculates when the brakes are overheating (calculates! Not measured!). I coded all of this stuff off, and now it operates with a static 40:60 rear biased awd power distribution, and no brake funkiness. Car drives better.

Car is updated with paddle shifter retrofit, Bilstien stocks and camber plates. Oh and it has the intake manifold and tune out of a 330i - making it a 330i motor (that is the only difference - this wagon now has 255hp vs 230hp originally)

Track video: https://www.youtube.com/watch?v=RDxCVvs5v-s

As can be seen on the track video - especially at around 3:42, the car rotates quite a lot on entry. Get it setup right for a corner with trail braking, and the back end will rotate very nicely. I set it up like a fwd car (-2.5f, -1r camber, -0.1f, 0.1r toe), and note that the front end toes out under compression (and rear toes out on lift), so the whole car gets loose in a trail braking situation. Hillariously fun on track.



Above, you can see me setting it up for a corner. Look how loaded the front tires are and unloaded the back is - and the camber difference. The back end is near 0 in that situation...and toe would be about 0 as well! I previously had the car lowered - looked sick...however, it drove like ass. Xdrive has reduced shock travel - and despite putting short stroke shocks on it, it bottomed out everywhere. On track, it would ride the bump stops and randomly understeer out of no where. I ended up selling the lowering springs (Eibachs) and went back to the stock xdrive springs. Car is way way way way better. Below is when the car was lowered...it did look damn cool doe.



Up next is m sport bumpers. It already has a bmw performance wheel, so I may as well continue the sport package retro fit and grab the sport seats too \:\) Oh and oil cooler. Car pulls timing on the track big time. Get's way too hot. I removed one of the under panels beneath the transmission and it helped big time - though timing is still pulled. Oil temps get too high, and the cooling system is burdened with cooling both the motor and transmission together.

Car drives great though, and is fun. Probably the only driver focused wagon in existence (ok - other than the Polestar).

For the nerdy, best lap time on ddt was 1:50.
This is on BFG SC2's, which are 380 tread wear tires. With real tires, it'll be in the 1:48 range no problem.
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#8787544 - 09/12/16 09:06 AM Re: New Milk Thread and Track day update :D [Re: 4age]
Denis Si Offline
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Nice. Love the wagon. Need to the daycare for kids to end so I can start looking at German milk myself
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#8787545 - 09/12/16 09:07 AM Re: New Milk Thread and Track day update :D [Re: Denis Si]
Choco 'Nuck Offline
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I'm loving it. Euphoric 2.0 ;\)
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#8787684 - 09/12/16 10:54 AM Re: New Milk Thread and Track day update :D [Re: Choco 'Nuck]
Screamin Type ARGH! Offline
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haha nice man.

and cool starry bra.

those front brakes gonna wear out quick lol.
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#8787750 - 09/12/16 11:39 AM Re: New Milk Thread and Track day update :D [Re: Screamin Type ARGH!]
4age Offline
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 Originally Posted By: Screamin DC2R
haha nice man.

and cool starry bra.

those front brakes gonna wear out quick lol.


Dunno. This is the first car in a long line of cars where I do not have to worry about the brakes. Pedal is always solid, and brakes hold up even at DDT.
It's on stock size rotors with nothing but Ferrodo DS2500 front pads and Castrol SRF fluid. Works perfect on the current setup. No fade all day at DDT. It has factory brake ducts which help a lot. And I removed the rotor splash shields which also help a lot \:\)
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#8787756 - 09/12/16 11:48 AM Re: New Milk Thread and Track day update :D [Re: 4age]
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 Originally Posted By: 4age
 Originally Posted By: Screamin DC2R
haha nice man.

and cool starry bra.

those front brakes gonna wear out quick lol.


Dunno. This is the first car in a long line of cars where I do not have to worry about the brakes. Pedal is always solid, and brakes hold up even at DDT.
It's on stock size rotors with nothing but Ferrodo DS2500 front pads and Castrol SRF fluid. Works perfect on the current setup. No fade all day at DDT. It has factory brake ducts which help a lot. And I removed the rotor splash shields which also help a lot \:\)


nice
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#8787785 - 09/12/16 12:10 PM Re: New Milk Thread and Track day update :D [Re: Screamin Type ARGH!]
zc911 Offline
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Nice!
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#8787836 - 09/12/16 12:41 PM Re: New Milk Thread and Track day update :D [Re: zc911]
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Awesome! If you need any coding done let me know. Keep an eye out for a set of beige sport seats as well will ya? \:\)
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#8787845 - 09/12/16 12:48 PM Re: New Milk Thread and Track day update :D [Re: zc911]
Euphoricuck Offline
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Nice steering wheel
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#8787915 - 09/12/16 01:26 PM Re: New Milk Thread and Track day update :D [Re: Euphoricuck]
phoenixrage Offline
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that red 86 tho
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#8787920 - 09/12/16 01:28 PM Re: New Milk Thread and Track day update :D [Re: phoenixrage]
4age Offline
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 Originally Posted By: phoenixrage
that red 86 tho

Yep!
It was on 120 tread wear tires. Gave my buddy's ITR a good run for the money \:D
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#8787924 - 09/12/16 01:33 PM Re: New Milk Thread and Track day update :D [Re: 4age]
phoenixrage Offline
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wish I had the $$$ for the track time to push my car that hard.
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#8787950 - 09/12/16 01:55 PM Re: New Milk Thread and Track day update :D [Re: phoenixrage]
Lafora Offline
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love the fact that you track a wagon :D. that alignment...nice \:D

i'm not sure if that amount of corner entry rotation in some cases actually hurts you more than helps you.

lemme rephrase: i'm sure it hurts, but i'm not sure if you feel the same.

look at the spots where you turn in once and the car tracks beautifully. the spots where turning-in via the nose gets a bit overzealous and it gets......non-ideal, especially in combination corners. a lot of the mid-exit u/s that i see actually started from that (not sure if you felt those u/s places)

question: when it rotates as you turn it on the nose, you have to get quickly back on the throttle to stop the rotation? but you aren't on full throttle?


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#8787993 - 09/12/16 02:34 PM Re: New Milk Thread and Track day update :D [Re: Lafora]
4age Offline
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Lafora has chimed in!!!
I agree - the amount of entry rotation actually hurts in some cases, and slows down the lap overall. It's entertaining though, and I do not mind that it's a sloppy mess. I have no intention to make this wagon competitive - I just want to have a ton of fun out there driving the snot out of this - and mission accomplished as you can see \:\)

That said, yes there is mid to exit understeer--this happens as soon as I get back on the throttle. Expected, but also necessary...as I get the car to turn in on the nose as you say (trailing brakes - on brakes until car is pointed to turn-in point, no gas until I want rotation to stop). I do not utilize full throttle to stop the rotation - the car will push too much.

That said, I'm at a loss at how to get the car to drive better. My first outing was dreadful (i have a video of that, but it's a snoozefest) with a more typical alignment one would expect on a rwd biased car. I really wanted it to loosen up on entry so I can get it to play ball...and then play with the gas to get the car to play nice from mid corner to exit.

I don't think I'd need to touch the alignment to get it to play nice - I just need to adjust pressures. But again, it's fun as is, and I have it setup this way purposely. My hot pressures are 36f 41r LOL
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#8788022 - 09/12/16 02:56 PM Re: New Milk Thread and Track day update :D [Re: 4age]
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^sorry if you already wrote it - but what about thicker adj. front sway bar install? did a bigger one on my s2k (Whiteline 3-way adj) and it helped a lot especially after realignment with more neg camber and 0 toe. eventually left it on the middle setting.

maybe dial in more rear camber as well, no?

i like the toe aspect with and without load, i can totally feel what it'd be doing with your description given lol. before i got toe down on the s2k that shit was super0-d0rift0 even with the slighest excessive turn-in or touch of early throttle trying to exit from apex ha.

also yes changing tires would make a huge difference too as you mentioned.
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#8788033 - 09/12/16 03:00 PM Re: New Milk Thread and Track day update :D [Re: 4age]
titty sprinkles Offline
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car is still looking good! always been a fan of the wagons, the M bumpers will look sick on it.
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#8788036 - 09/12/16 03:01 PM Re: New Milk Thread and Track day update :D [Re: Screamin Type ARGH!]
4age Offline
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^i dont feel like the front end needs to be touched.
It's dialed and I like the way it behaves. To Cyril's point, the car isn't fast because of over rotation in some instances. But it's fun and engaging \:\)

It's the back end that needs to be dialed down, and tire pressures can do a big thing to fix that IMO. I'm actually going to an M3 rear sway bar to get the car to rotate more in lift throttle situations - it currently does not rotate in throttle lift - it only does so under trail braking (talking about 0 elevation here).

EDIT: Problem is combo corners and chicanes as Lafora noted. If the car is already rotating and setup for turn 1, then by turn 2 it's kind of out of shape and understeering on exit...and not ideal to setup for the combo corner. I compensate by either trailing the throttle here (not enough rotation in this scenario doe - which is why i want a bigger rear bar), or by left foot braking to load the nose again. Basically, I'm using the brakes to load the front tires up to get it to "turn on the nose" for the subsequent turn. You can see in the vid I lose time in the s turns and chicanes, but catch everyone up on entry and braking zones \:\/


Edited by 4age (09/12/16 03:05 PM)
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#8788041 - 09/12/16 03:05 PM Re: New Milk Thread and Track day update :D [Re: 4age]
Lafora Offline
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if you want to get rid of the mid-exit u/s, ease off on driving it in on its nose. watch your clip again, every time the turn in isn't affirmative (ie you either turn in gingerly, or you turn it in and have to make a quick adjustment), it washes out by the time you get to the apex and you can't unwind as you want to. interestingly enough, every corner where you CAN turn it in with one firm input, the car just tracks like it's on rails. i won't bore you as to why that happens, but yours is not the first nor the last case that happens. I dare say at this level of driving (ie beginner-intermediate gentleman driver, kids with little car experience regardless of kartiing success) 95% of mid-exit u/s stems from that type of entry behaviour. Tl:DR; if you want to rid of the mid-exit u/s, fix the entry. It'll drive better. you might feel it's less fun, but it'll go where you want it to go when you want it to go.

Second educated guess from your reports and the car's behaviour is the feet are too happy. Either on brakes, or on throttle. GT cars rarely can be driven that way. Karts, yes; formula cars MAYBE (probably not); GT definitely not and I daresay production street cars definitely not. Basically the heavier the cars, and the more compliant the cars, the less you can rock the platform; and every time there's input (wheel, throttle, brake) the platform is being rocked. People who read this probably are thinking "so you're saying there needs to be coasting?" Believe it or not, yes there needs to be coasting. Coasting is when the car handles (and it'll rotate as well), it also lets you get on full power earlier. Name of the game isn't to get on power early, it's to get on FULL power early.

Go on youtube, search DTM, look at Marco Wittmann's recent onboard at race 2 at the nurburgring. I can watch that footwork all day. Confirmation bias aside, if I were to compare that onboard & footwork vs Wickens' footwork at the same race, give me MW's footwork all day, everyday. (one guy finished 3rd, one guy finished 14th btw....even though they're in the top 3 in the driver's standings overall this season)

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#8788042 - 09/12/16 03:07 PM Re: New Milk Thread and Track day update :D [Re: Lafora]
phoenixrage Offline
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now I gotta re-watch my footage from DDT.
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#8788044 - 09/12/16 03:08 PM Re: New Milk Thread and Track day update :D [Re: 4age]
titty sprinkles Offline
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interesting. you would think that the ass-end would be a little happy. the thicker swaybar should help with that tho.

front end does look good but something like this would be nice and aggressive to match the wheels.



i do like rice tho. lol
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#8788055 - 09/12/16 03:17 PM Re: New Milk Thread and Track day update :D [Re: Lafora]
4age Offline
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Thanks. I'm going to search up the Wittmann video you mentioned.
FWIW I don't *think* I am foot happy. I am coasting very often. I don't touch the power until I want the car to track out - usually that happens after I get the car pointed into the apex via trail braking. Thing is, the car pushes on power (open diffs here!), so my steering unwind is not as quick as optimal.

That said, I recognize the issue espeically in combo corners - turning this way is not the fastest way to do it. Totally get it. I am just having a ball out there. I'd rather be slower and have fun, than kick arse and not have fun - my S4 was the latter and I got tired of it quickly. I'll look to be less zealous about trail braking it in all over just to get the ass to come around next time. I'm sure it'll be faster. It's just...... I cannot resist XD XD XD

ESP in the wet: https://www.youtube.com/watch?v=-PpGodDX-gg
bahaha. Tires got too much scrub in a couple corners doe.
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#8788061 - 09/12/16 03:21 PM Re: New Milk Thread and Track day update :D [Re: 4age]
Lafora Offline
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still boggles the mind you track a wagon XD
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#8788285 - 09/12/16 07:46 PM Re: New Milk Thread and Track day update :D [Re: Lafora]
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Is this car in addition to the s4?
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#8788304 - 09/12/16 08:04 PM Re: New Milk Thread and Track day update :D [Re: JEFFOS]
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Don't worry jeff, no one balls more than you;)
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#8788350 - 09/12/16 09:03 PM Re: New Milk Thread and Track day update :D [Re: Choco 'Nuck]
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#8788558 - 09/13/16 08:05 AM Re: New Milk Thread and Track day update :D [Re: JEFFOS]
4age Offline
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 Originally Posted By: JEFFOS
Is this car in addition to the s4?

No.
Stupid but, I traded the S4.
I was paying 550 a month to finance something that I grew to not like very much.
Not very driver involving and too clinical of a performance drive. It's very capable, but took no skill to go fast. Didn't find it worth while to continue paying for something which I did not enjoy. Got rid of it > got the wagon > pocketed some money and now I have no car payments.

Crazy, right? XD Car ADD right here for sure.
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#8788560 - 09/13/16 08:07 AM Re: New Milk Thread and Track day update :D [Re: 4age]
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 Originally Posted By: 4age
 Originally Posted By: JEFFOS
Is this car in addition to the s4?

No.
Stupid but, I traded the S4.
I was paying 550 a month to finance something that I grew to not like very much.
Not very driver involving and too clinical of a performance drive. It's very capable, but took no skill to go fast. Didn't find it worth while to continue paying for something which I did not enjoy. Got rid of it > got the wagon > pocketed some money and now I have no car payments.

Crazy, right? XD Car ADD right here for sure.


almost similar feeling i had with teh STI but in addition it was a gas pig lol.

sounds like you need an AAAAAAARRRGGGHHH

or better yet get a DD and first gen NSX as track toy ;\)
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#8789492 - 09/13/16 10:02 PM Re: New Milk Thread and Track day update :D [Re: 4age]
iamfob Offline
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 Originally Posted By: 4age
 Originally Posted By: JEFFOS
Is this car in addition to the s4?

No.
Stupid but, I traded the S4.
I was paying 550 a month to finance something that I grew to not like very much.
Not very driver involving and too clinical of a performance drive. It's very capable, but took no skill to go fast. Didn't find it worth while to continue paying for something which I did not enjoy. Got rid of it > got the wagon > pocketed some money and now I have no car payments.

Crazy, right? XD Car ADD right here for sure.


time for you to go back to basics like Risky

maybe go back to a 91 EF Civic with no power steering, crank windows. Light weight and VTEC...dat feelz
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#8789595 - 09/14/16 07:54 AM Re: New Milk Thread and Track day update :D [Re: iamfob]
Euphoricuck Offline
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And zip ties
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#8789964 - 09/14/16 01:54 PM Re: New Milk Thread and Track day update :D [Re: Screamin Type ARGH!]
4age Offline
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 Originally Posted By: Screamin DC2R
 Originally Posted By: 4age
 Originally Posted By: JEFFOS
Is this car in addition to the s4?

No.
Stupid but, I traded the S4.
I was paying 550 a month to finance something that I grew to not like very much.
Not very driver involving and too clinical of a performance drive. It's very capable, but took no skill to go fast. Didn't find it worth while to continue paying for something which I did not enjoy. Got rid of it > got the wagon > pocketed some money and now I have no car payments.

Crazy, right? XD Car ADD right here for sure.


almost similar feeling i had with teh STI but in addition it was a gas pig lol.

sounds like you need an AAAAAAARRRGGGHHH

or better yet get a DD and first gen NSX as track toy ;\)


I actually seriously think about the NSX.
But in reality, if you had one, would you track it?
With most groups - I probably wouldn't due to lack of safety. That's not exactly a car that is easily fixable (body wise) if something went awry. Would need to go to baller track days with less cars/people and more open track \:\)

BTW a guy following the wagon on track said I lift the inside rear tire everywhere. Bahaha. On stock sways. Brilliant. I tried it on the street and yup, you can feel it. And if you have the wheel in the air and get on the gas > and the wheel drops back down, there will be a jolt from the drive line shock and the wheel hitting the tarmac with traction again. A bmw that tripods...in the back. Yes XD XD XD
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#8790043 - 09/14/16 02:49 PM Re: New Milk Thread and Track day update :D [Re: 4age]
LNXGUY Moderator Offline
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I'd love to track the 335d but I'd be afraid I'd bust something
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#8790109 - 09/14/16 03:39 PM Re: New Milk Thread and Track day update :D [Re: LNXGUY]
4age Offline
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 Originally Posted By: LNXGUY
I'd love to track the 335d but I'd be afraid I'd bust something


Go to a day with instructors.
Worth doing - you will learn a lot of car control and it applies to daily driving. Trillium BMW club is inexpensive and their instructed track days are dirt cheap at Mosport (250 a weekend???).
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#8790111 - 09/14/16 03:40 PM Re: New Milk Thread and Track day update :D [Re: 4age]
Risky Business Offline
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 Originally Posted By: 4age
track days are dirt cheap


Said no one ever

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#8790162 - 09/14/16 04:28 PM Re: New Milk Thread and Track day update :D [Re: Risky Business]
Choco 'Nuck Offline
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 Originally Posted By: Sir Risky Business
 Originally Posted By: 4age
track days are dirt cheap


Said no one ever

Lulz, stock pads will be cooked on the 335d after a few laps

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#8790183 - 09/14/16 05:00 PM Re: New Milk Thread and Track day update :D [Re: Choco 'Nuck]
titty sprinkles Offline
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^when's your new milk thread?
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#8790207 - 09/14/16 05:26 PM Re: New Milk Thread and Track day update :D [Re: Choco 'Nuck]
4age Offline
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 Originally Posted By: Chocolate Canuck
 Originally Posted By: Sir Risky Business
 Originally Posted By: 4age
track days are dirt cheap


Said no one ever

Lulz, stock pads will be cooked on the 335d after a few laps


Any pads with a new driver will be cooked after a few laps. Makes no diff!
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#8790208 - 09/14/16 05:27 PM Re: New Milk Thread and Track day update :D [Re: Risky Business]
4age Offline
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 Originally Posted By: Sir Risky Business
 Originally Posted By: 4age
track days are dirt cheap


Said no one ever


Said the back to basics 4%er
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#8790338 - 09/14/16 08:35 PM Re: New Milk Thread and Track day update :D [Re: 4age]
Euphoricuck Offline
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 Originally Posted By: 4age
I tried it on the street and yup, you can feel it.
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#8790485 - 09/15/16 07:54 AM Re: New Milk Thread and Track day update :D [Re: Euphoricuck]
4age Offline
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Registered: 09/11/01
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 Originally Posted By: Euphoricuck
 Originally Posted By: 4age
I tried it on the street and yup, you can feel it.


why u laff. round about in milton
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#8790494 - 09/15/16 08:10 AM Re: New Milk Thread and Track day update :D [Re: 4age]
Risky Business Offline
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He is saying he is a better driver than you in a smug round about recline your seat after an on ramp type of way.
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#8790515 - 09/15/16 09:02 AM Re: New Milk Thread and Track day update :D [Re: Risky Business]
Euphoricuck Offline
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Registered: 11/05/03
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He didn't feel shit. Senna over here
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#8790519 - 09/15/16 09:04 AM Re: New Milk Thread and Track day update :D [Re: Euphoricuck]
Screamin Type ARGH! Offline
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#8790521 - 09/15/16 09:08 AM Re: New Milk Thread and Track day update :D [Re: Euphoricuck]
4age Offline
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 Originally Posted By: Euphoricuck

He didn't feel shit. Senna over here


i'm sorry that you cannot tell when the front end loads so much and the back end get's off the ground @_@ esp in an awd car that jolts once the rear tire hits the ground again under power. the last bit is the very obvious indicator.

remember - open diff. the car is spinning the lifted tire. what happens when it touches the ground? surely you can feel that if you're not too busy reclining the seat :p
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#8790568 - 09/15/16 09:54 AM Re: New Milk Thread and Track day update :D [Re: 4age]
Euphoricuck Offline
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Registered: 11/05/03
Posts: 92703
Loc: Canadistan
Interesting fantasy.
You can feel the extra power everytime you wax the car , can't you
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#8796680 - 09/21/16 06:19 PM Re: New Milk Thread and Track day update :D [Re: Euphoricuck]
Lafora Offline
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Registered: 12/16/01
Posts: 4623
I am not entirely sure if an OEM company, by design, will have a rear toe curve in pitch to have a negative slope. its entirely possible for sure, but probably not on a wagon designed for the masses. Just seems completely backwards if one thinks about it.

edit: typed heave when i meant pitch.


Edited by Lafora (09/22/16 09:03 PM)

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#8796910 - 09/22/16 08:24 AM Re: New Milk Thread and Track day update :D [Re: Lafora]
4age Offline
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Registered: 09/11/01
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Loc: North York, Ontario, Canada
 Originally Posted By: Lafora
I am not entirely sure if an OEM company, by design, will have a rear toe curve in heave to have a negative slope. its entirely possible for sure, but probably not on a wagon designed for the masses. Just seems completely backwards if one thinks about it.


Just to make sure I am understanding english XD
You are saying that a car with a rear end which toes out in droop is unlikely--yeah? But this means that the rear end toes in on compression, which reduces rear steer. You are seeing that it's more common for it to toe-in under droop and toe out under compression? I know that the 2nd gen RX7 did this rear steer thing (amongst other cars such as Mercury Cougar), but those were known to be the less traditional setups.
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#8797635 - 09/22/16 05:27 PM Re: New Milk Thread and Track day update :D [Re: 4age]
hyper-s2k Offline
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Registered: 12/01/05
Posts: 14556
Loc: T dot O dot, Canada
 Originally Posted By: 4age
 Originally Posted By: JEFFOS
Is this car in addition to the s4?

No.
Stupid but, I traded the S4.
I was paying 550 a month to finance something that I grew to not like very much.
Not very driver involving and too clinical of a performance drive. It's very capable, but took no skill to go fast. Didn't find it worth while to continue paying for something which I did not enjoy. Got rid of it > got the wagon > pocketed some money and now I have no car payments.

Crazy, right? XD Car ADD right here for sure.


I think zc911 is the poster boy of car ADD.

I think I need you / lafora to give me some pointers on the track - i'm still digesting all the notes from this post. \:D
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#8797653 - 09/22/16 05:44 PM Re: New Milk Thread and Track day update :D [Re: hyper-s2k]
Mr Fatty Offline
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Registered: 11/08/06
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I really like those BMW wagons. Always wanted one myself
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#8797666 - 09/22/16 06:07 PM Re: New Milk Thread and Track day update :D [Re: Mr Fatty]
4age Offline
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Thanks Fatty. I see you have a Crosstrek tho - and a manual one at that.
Those are super nice. It was on my short list as well \:\)

@Hyper Lafora is basically saying to not go full retard on the rotation. Too much slows you down. I was doing it for laughs, but he is making sure that there isn't the misconception that looser/more sideways = faster. It costs time. If you watch the video, you'll see that on a number of corners, I still have the steering wheel turned in at corner exit - despite rotating the car in on entry. Problem here is loose off power and push on power. The choice here is to manage it such that the car is braked/turned in/rotating towards apex at the right moment so that you can go full gas to stop rotation and unwind on corner exit....rather than slide with glee all over the place.

It's all weight transfer amirite. Load the front tires to get the car to dance. Load the rear tires to stop the dance. Needs to be executed at the right moments to string corners together in the most efficient manner.
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#8797851 - 09/22/16 09:00 PM Re: New Milk Thread and Track day update :D [Re: 4age]
Lafora Offline
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Registered: 12/16/01
Posts: 4623
 Originally Posted By: 4age
 Originally Posted By: Lafora
I am not entirely sure if an OEM company, by design, will have a rear toe curve in heave to have a negative slope. its entirely possible for sure, but probably not on a wagon designed for the masses. Just seems completely backwards if one thinks about it.


Just to make sure I am understanding english XD
You are saying that a car with a rear end which toes out in droop is unlikely--yeah? But this means that the rear end toes in on compression, which reduces rear steer. You are seeing that it's more common for it to toe-in under droop and toe out under compression? I know that the 2nd gen RX7 did this rear steer thing (amongst other cars such as Mercury Cougar), but those were known to be the less traditional setups.


The rear toe is one of a rare few parameters that plays an enormous amount in terms of sensitivity on limit balance / stability. In english that just means that the slope of the curve of us/os to per deg toe change is steeper for rear toe than it is for the front.

So having said that, and keeping in mind this is an OEM vehicle that isn't a sports car by design, I am skeptical it'll have a bumpsteer curve that has a negative slope in droop. It well could have, I don't know, but I'm not sure if mrs soccer mom would appreciate the back end dancing around as she's stoping for an unsight snoopy crossing the road in front of her with Timmy in the back seat munching on a doughnut

If you look at it from an emergency situation avoidance point of view, it'd make even less sense to have a rear bump steer curve with a negative slope (ie losing rear toe in as pitch angle increases). Person stands on the brakes AND steer at the same time. As he/she steers, rear toe out increases, increasing agility and therefore decreasing stability (keep in mind more often than not, the front geometric roll centre height is also lower than that of the rear relative to the car's CGH; so you have MORE roll angle on the front vs the rear, thereby reducing the effect of roll-steer (regardless of its slope on the curve) at the INITIAL steering input on the rear ANDDDDD have a quicker response in the back relative to the front simply due to the RCH - CGH relation). How many Joe Schmoes do you think can handle that shit in an emergency? Not to mention the probability of rear ride height increasing a large range is higher than the probability of rear ride height decreasing a large range (ie a person gunning the car enough to squat OUT of a corner). So in that case, why wouldn't you have a rear bump steer curve that toes in on droop and out on compression? You're unloading the rear tires, thereby decreasing its grip AND you're giving it toe out under OEM situation? the more I write this and the more I reason along that line, the more unlikely I feel it to be the case.

People don't often drive a car hard enough in transient for a rear toe out bump steer to wad it up into the wall. But they sure as hell will brake hard enough and need the steering to have it lose control. Does that make sense?

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#8797876 - 09/22/16 09:13 PM Re: New Milk Thread and Track day update :D [Re: 4age]
Lafora Offline
Post Master Sr


Registered: 12/16/01
Posts: 4623
 Originally Posted By: 4age
Thanks Fatty. I see you have a Crosstrek tho - and a manual one at that.
Those are super nice. It was on my short list as well \:\)

@Hyper Lafora is basically saying to not go full retard on the rotation. Too much slows you down. I was doing it for laughs, but he is making sure that there isn't the misconception that looser/more sideways = faster. It costs time. If you watch the video, you'll see that on a number of corners, I still have the steering wheel turned in at corner exit - despite rotating the car in on entry. Problem here is loose off power and push on power. The choice here is to manage it such that the car is braked/turned in/rotating towards apex at the right moment so that you can go full gas to stop rotation and unwind on corner exit....rather than slide with glee all over the place.

It's all weight transfer amirite. Load the front tires to get the car to dance. Load the rear tires to stop the dance. Needs to be executed at the right moments to string corners together in the most efficient manner.


This is where what I'm going to write is tricky, not tricky in terms of a feedback / advise point of view, but what I write highly depends on how the driver approaches the corner.

I dare say 90% of the time, for drivers who range from beginner lappers all the way up to even experienced karters just starting to get into a car for the first time, most corner exit u/s is caused by corner entry o/s. Assuming they dont' arrive at the corner with their front tires on fire.

Think about this.

You want the car to rotate quick on entry, so you shallow up the line, because by instinct, that's what you'd do. By shallow I'm talking the car's traj; so in essence you're running an initial tighter arc, because if you swing a wide arc that requires more steering input at the initial entry phase when you square up the corner, the car will probably come around on you so fast it'll get even hairier, quicker.

So you shallow up the line with less steering input, but you have to dial MORE input in to make it the rest of the corner. This is all fine if you don't have to correct the initial steering and back off of the steering angle; if you do, forget it, it's game over. First 30% of the corner, you have steering input X. If you correct, you're either at 0 or worst, -X degree. By the time you gathered up the car, say another 20% of the corner has blown by. So now for the remaining 50% of the corner, you need to put > X deg of input to make it around. Meanwhile, you're seeing it's time to step on the gas, so you get on the gas and dial MORE input because you need to make it around the corner. No way in hell will the car not push under those circumstances. Even if you get the car to the apex, if it isn't pointed correctly, it's still going to cost time. I don't have empirical hard data that I can show you that this is the case, but for the past 10 seasons, combining video and data, this is what I see more often than not.

Worst is in a racing situation if the driver AND the engineer doesn't see this, they're FUCKED. Driver comes in, bitching about corner exit u/s. So the engineer loosens up the car. The more they loosen the car, the worse it gets. A dog chasing its tail and they're suddenly wondering why the fuck they're a second off their reference lap.

THAT is why I'm a huge supporter of rotation at steady state (ie no input); because it makes the diagnosis and cure SO much more efficient. Does the car need to rotate on entry? Yes. But does it need to rotate fast on its nose? No.

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#8797953 - 09/22/16 10:24 PM Re: New Milk Thread and Track day update :D [Re: Lafora]
4age Offline
XD XD XD XD
Post Master Sr


Registered: 09/11/01
Posts: 3969
Loc: North York, Ontario, Canada
 Originally Posted By: Lafora
 Originally Posted By: 4age
 Originally Posted By: Lafora
I am not entirely sure if an OEM company, by design, will have a rear toe curve in heave to have a negative slope. its entirely possible for sure, but probably not on a wagon designed for the masses. Just seems completely backwards if one thinks about it.


Just to make sure I am understanding english XD
You are saying that a car with a rear end which toes out in droop is unlikely--yeah? But this means that the rear end toes in on compression, which reduces rear steer. You are seeing that it's more common for it to toe-in under droop and toe out under compression? I know that the 2nd gen RX7 did this rear steer thing (amongst other cars such as Mercury Cougar), but those were known to be the less traditional setups.


The rear toe is one of a rare few parameters that plays an enormous amount in terms of sensitivity on limit balance / stability. In english that just means that the slope of the curve of us/os to per deg toe change is steeper for rear toe than it is for the front.

So having said that, and keeping in mind this is an OEM vehicle that isn't a sports car by design, I am skeptical it'll have a bumpsteer curve that has a negative slope in droop. It well could have, I don't know, but I'm not sure if mrs soccer mom would appreciate the back end dancing around as she's stoping for an unsight snoopy crossing the road in front of her with Timmy in the back seat munching on a doughnut

If you look at it from an emergency situation avoidance point of view, it'd make even less sense to have a rear bump steer curve with a negative slope (ie losing rear toe in as pitch angle increases). Person stands on the brakes AND steer at the same time. As he/she steers, rear toe out increases, increasing agility and therefore decreasing stability (keep in mind more often than not, the front geometric roll centre height is also lower than that of the rear relative to the car's CGH; so you have MORE roll angle on the front vs the rear, thereby reducing the effect of roll-steer (regardless of its slope on the curve) at the INITIAL steering input on the rear ANDDDDD have a quicker response in the back relative to the front simply due to the RCH - CGH relation). How many Joe Schmoes do you think can handle that shit in an emergency? Not to mention the probability of rear ride height increasing a large range is higher than the probability of rear ride height decreasing a large range (ie a person gunning the car enough to squat OUT of a corner). So in that case, why wouldn't you have a rear bump steer curve that toes in on droop and out on compression? You're unloading the rear tires, thereby decreasing its grip AND you're giving it toe out under OEM situation? the more I write this and the more I reason along that line, the more unlikely I feel it to be the case.

People don't often drive a car hard enough in transient for a rear toe out bump steer to wad it up into the wall. But they sure as hell will brake hard enough and need the steering to have it lose control. Does that make sense?


Totally agree with what you are saying, and this is what i thought as well. However, when i put my car on the alignment rack, the rear toe went negative as soon as i swapped my eibachs for my stock springs (read: raising ride height reduced rear toe).

I will write more in the morning, but c&d confirms this with a k&c machine.
Excerpt: "The f30 outside rear wheel toes in significantly more when subjected to cornering loads. This is a stabilizing feature to induce understeer, and BMW apparently implemented it as an alternative to the e90 staggered (larger in back) tire sizes."

http://blog.caranddriver.com/a-tale-of-t...l-so-different/

Fwiw i have not driven a car in recent times that turn in this well under a trail braking situation. It is far more lively than the audi and even the boss under braking. The toe curve is for the win on this one. Loses toe on droop.

Edit - if u look at stock e90 alignment numbers you see why it is alignedthat way as well. It cAlls for a whack load of rear toe. Something to the tune of .3 degrees. So soccer moms can enjoy a stable rear end at the expense of tires \:\)


Edited by 4age (09/22/16 10:26 PM)
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#8797961 - 09/22/16 10:31 PM Re: New Milk Thread and Track day update :D [Re: Lafora]
4age Offline
XD XD XD XD
Post Master Sr


Registered: 09/11/01
Posts: 3969
Loc: North York, Ontario, Canada
 Originally Posted By: Lafora
 Originally Posted By: 4age
Thanks Fatty. I see you have a Crosstrek tho - and a manual one at that.
Those are super nice. It was on my short list as well \:\)

@Hyper Lafora is basically saying to not go full retard on the rotation. Too much slows you down. I was doing it for laughs, but he is making sure that there isn't the misconception that looser/more sideways = faster. It costs time. If you watch the video, you'll see that on a number of corners, I still have the steering wheel turned in at corner exit - despite rotating the car in on entry. Problem here is loose off power and push on power. The choice here is to manage it such that the car is braked/turned in/rotating towards apex at the right moment so that you can go full gas to stop rotation and unwind on corner exit....rather than slide with glee all over the place.

It's all weight transfer amirite. Load the front tires to get the car to dance. Load the rear tires to stop the dance. Needs to be executed at the right moments to string corners together in the most efficient manner.


This is where what I'm going to write is tricky, not tricky in terms of a feedback / advise point of view, but what I write highly depends on how the driver approaches the corner.

I dare say 90% of the time, for drivers who range from beginner lappers all the way up to even experienced karters just starting to get into a car for the first time, most corner exit u/s is caused by corner entry o/s. Assuming they dont' arrive at the corner with their front tires on fire.

Think about this.

You want the car to rotate quick on entry, so you shallow up the line, because by instinct, that's what you'd do. By shallow I'm talking the car's traj; so in essence you're running an initial tighter arc, because if you swing a wide arc that requires more steering input at the initial entry phase when you square up the corner, the car will probably come around on you so fast it'll get even hairier, quicker.

So you shallow up the line with less steering input, but you have to dial MORE input in to make it the rest of the corner. This is all fine if you don't have to correct the initial steering and back off of the steering angle; if you do, forget it, it's game over. First 30% of the corner, you have steering input X. If you correct, you're either at 0 or worst, -X degree. By the time you gathered up the car, say another 20% of the corner has blown by. So now for the remaining 50% of the corner, you need to put > X deg of input to make it around. Meanwhile, you're seeing it's time to step on the gas, so you get on the gas and dial MORE input because you need to make it around the corner. No way in hell will the car not push under those circumstances. Even if you get the car to the apex, if it isn't pointed correctly, it's still going to cost time. I don't have empirical hard data that I can show you that this is the case, but for the past 10 seasons, combining video and data, this is what I see more often than not.

Worst is in a racing situation if the driver AND the engineer doesn't see this, they're FUCKED. Driver comes in, bitching about corner exit u/s. So the engineer loosens up the car. The more they loosen the car, the worse it gets. A dog chasing its tail and they're suddenly wondering why the fuck they're a second off their reference lap.

THAT is why I'm a huge supporter of rotation at steady state (ie no input); because it makes the diagnosis and cure SO much more efficient. Does the car need to rotate on entry? Yes. But does it need to rotate fast on its nose? No.


I suspect the problem you describe is much more prominent on mid engine or rear engine cars. I can totally see this being a very typical scenario in a 911. Now that is loose on entry and mad dog push on exit (stock anyways). I can especially see someone diaming more steering in a 911 mid corner too - after having rotated on entry and getting back on the throttle to keep dat ass in line. I dont necessairly this being the case as often in a front engine car doe. Less pushy on the gas -- especially spmething like solid axle mustang
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#8797966 - 09/22/16 10:45 PM Re: New Milk Thread and Track day update :D [Re: 4age]
Lafora Offline
Post Master Sr


Registered: 12/16/01
Posts: 4623
 Originally Posted By: 4age

http://blog.caranddriver.com/a-tale-of-t...l-so-different/

Fwiw i have not driven a car in recent times that turn in this well under a trail braking situation. It is far more lively than the audi and even the boss under braking. The toe curve is for the win on this one. Loses toe on droop.

Edit - if u look at stock e90 alignment numbers you see why it is alignedthat way as well. It cAlls for a whack load of rear toe. Something to the tune of .3 degrees. So soccer moms can enjoy a stable rear end at the expense of tires \:\)



putting it on a k&c machine....fucking hell that is awesome.

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#8798097 - 09/23/16 07:09 AM Re: New Milk Thread and Track day update :D [Re: Lafora]
Euphoricuck Offline
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Registered: 11/05/03
Posts: 92703
Loc: Canadistan
So much talk. So much slow XD
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#8798223 - 09/23/16 09:12 AM Re: New Milk Thread and Track day update :D [Re: Euphoricuck]
4age Offline
XD XD XD XD
Post Master Sr


Registered: 09/11/01
Posts: 3969
Loc: North York, Ontario, Canada
This is some Risky level trolling going on XD
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#8798771 - 09/23/16 02:28 PM Re: New Milk Thread and Track day update :D [Re: 4age]
titty sprinkles Offline
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Registered: 08/22/05
Posts: 17187
Loc: Toronto,Ontario
damn, the closest i get on the street is full stiff on the suspension and sport + mode. such racecar many slow lol.

car does handle very nice, 4ws kicks in, stiffer steering wheel, it's fun for a road refrigerator
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