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#1935290 - 10/10/07 02:24 AM Re: So a supra just dominated... [Re: ErikB]
Nealoc187 Offline
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 Originally Posted By: ErikB
damn! Hey, what did that SVS viper run? (the stars and stripes)


a guy I know (charles) tuned that car. he's a good friend of one of my best friends. the guys there at that shop are all awesome, the driver of that car (Ron Jr.) ran the dyno when I dyno'd there. he and his dad let us have the run of the place one saturday, there are some retarded cars being put together in there all the time but they made us promise not to give away any setups or take any pictures or video of any setups. it was pretty frickin cool.
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#1944757 - 10/13/07 02:20 AM Re: So a supra just dominated... [Re: Krisiun]
homer Offline
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Very impressive - the Hennessey Viper in the R&T shootout did 220 in the mile (beating the Veyron as well)

http://www.roadandtrack.com/article.asp?section_id=31&article_id=5675

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#1945231 - 10/13/07 01:23 PM Re: So a supra just dominated... [Re: ]
Mr. Knowitall. Offline
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 Originally Posted By: 00Formula
 Originally Posted By: Euphoric
thats retardo....even with all that spinning to get up to that speed. amazing!


The spinning actually helps I think to a certian extent.
I know it does at the dragstrip vs hooking and bogging, or just feeding in
enough throttle to not spin.
By spinning and still accelerating at a decent rate, read moderate slippage,
your putting down more hp. That way your not bogging the engine, and will
achieve a faster speed, but not a faster time to cover the same distance.


You're a tool. He isn't spinning the tires to keep the motor in the powerband. he is trying furiously with his right foot to keep the turbo moderately spooled.

That car doesn't make dick for power before the turbo spools, and if he could put down the traction limit it's faster than spinning.

Period.

If you had a spinning/burning out tire and I had one that was stationary I could create a stronger co-efficient of friction, and if we both put our tires on a plank I could pull it away from you.

If I can apply more power, then I can accelerate faster. Race cars don't go skidding around corners for at least two reasons: 1 is scrubing speed, but the other is because there is more traction available, more force to keep your car on the road, when the tires are not slipping.

Y`know the scrub scrub before the chirp chirp? Well the scrub scrub is the most you can get out of a tire, and when you go chirp chirp you're also going slower.
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#1945563 - 10/13/07 05:12 PM Re: So a supra just dominated... [Re: ]
kyden Offline
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you're missing the point. race car drivers are trying to beat a 'clock'. the point of this is to have the greatest "trap" at the end of the mile. anyone who's ever been to a dragstrip understands this. when you spin, you end up with a higher trap speed, but a shittier time. in this case, no one actually cares about the ET
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#1945971 - 10/13/07 08:27 PM Re: So a supra just dominated... [Re: ]
Professor Paki Administrator Offline
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Chuck you beat me to it.

Also, I recall that optimum acceleration occurs with the tires spinning about 10% faster than if they had full traction?

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#1946627 - 10/14/07 03:42 AM Re: So a supra just dominated... [Re: Professor Paki]
Nealoc187 Offline
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Unless someone can show me some mathematics to substantiate the claim, I will continue to refute the old wives tale that spinning your tires makes for faster trap speeds. In my experience, that has never been the case. The only time I've found it to hold true is in comparison to a bogging situation.

Full traction acceleration > wheel spinning acceleration
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#1947287 - 10/14/07 02:38 PM Re: So a supra just dominated... [Re: Nealoc187]
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Slip angle in a turn is, to some degree(lol punny), about scrubbing speed you would otherwise brake off. There are too many complicated aspects involved in track racing vs. this idea of force applied and traction.

But in the end the tire that has already lost traction (maybe 7* doesn't slip the tire?) can apply less force.

This is ultra basic physics. Things require X to start sliding, and X-Y to keep sliding. The difference, or the Y value, exists. I think we're done?
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#1947305 - 10/14/07 02:44 PM Re: So a supra just dominated... [Re: Professor Paki]
Mr. Knowitall. Offline
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 Originally Posted By: pakisho
Apparently Tommy (owner of the supra) ran the 228mph on the second day after switching to 18 inch wheels, which allowed him to hook in third.


Experiencowned. Well, we have shitty anecdotal evidence supporting both sides, but Newtonian physics supporting only 1.

I think you're wrong.
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#1947652 - 10/14/07 04:59 PM Re: So a supra just dominated... [Re: ]
00Formula
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Every real world experience at the drag strip has shown me that slight tire slippage produces higher traps and higher ET's.
Hooking will produce a lower ET and lower trap speed.

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#1947818 - 10/14/07 06:31 PM Re: So a supra just dominated... [Re: ]
Mr. Knowitall. Offline
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 Originally Posted By: 00Formula
Every real world experience at the drag strip has shown me that slight tire slippage produces higher traps and higher ET's.
Hooking will produce a lower ET and lower trap speed.


Except for when this supra put on sticker tires and trapped higher.
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#1947836 - 10/14/07 06:36 PM Re: So a supra just dominated... [Re: Mr. Knowitall.]
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It seems the 7* slip angle is to put a new load on the tire which improves traction.
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#1948081 - 10/14/07 07:51 PM Re: So a supra just dominated... [Re: Mr. Knowitall.]
00Formula
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 Originally Posted By: Mr. Knowitall.
Except for when this supra put on sticker tires and trapped higher.


Notice the term "slight slippage". Of course if you put 6" wide snow tires on a 1000rwhp car your not going to trap very high, due to extreme slippage.

I'm sure he still had slippage even with the sticker tires, correct?

Excessive slipping is just as bad as bogging the engine from too much grip if
your worried about trap speed.

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#1948222 - 10/14/07 08:34 PM Re: So a supra just dominated... [Re: ]
BeeKiller Offline
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Heres the in car

http://www.youtube.com/watch?v=uU8DxXhwdSI

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#1948652 - 10/14/07 10:32 PM Re: So a supra just dominated... [Re: BeeKiller]
Euphoricuck Offline
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I wonder if he pedaled a bit more if it woudl help..?

nothing like driving 200+ mph with one hand on the wheel
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#1948719 - 10/14/07 10:52 PM Re: So a supra just dominated... [Re: Euphoricuck]
BeeKiller Offline
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If the shits gonna go sour at 200+ I dont think it matters if you had 10 hands on the wheel.
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#1949954 - 10/15/07 12:50 PM Re: So a supra just dominated... [Re: homer]
John Titor Offline
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 Originally Posted By: homer
Very impressive - the Hennessey Viper in the R&T shootout did 220 in the mile (beating the Veyron as well)

http://www.roadandtrack.com/article.asp?section_id=31&article_id=5675



that story was a good read. i remember it saying the viper could've kept going had it had more road (or runway)
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#1950933 - 10/15/07 05:42 PM Re: So a supra just dominated... [Re: ]
Impulsive Online   nohc
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I think basic frictional physics don't apply to the tire/pavement interface.

We had a thread a couple years back and theoretically, the contact patch of the tire doesn't change frictional force, but we all know you hook better with bigger tires. Why? My guess is that tires, tire treads, asphalt are not theoretically ideal. They are not smooth and there is likely some additional frictional forces occuring beyond the normal force and coefficient.
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#1958240 - 10/17/07 08:01 PM Re: So a supra just dominated... [Re: ]
BeeKiller Offline
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 Originally Posted By: 98_1LE
 Originally Posted By: Mr. Knowitall.
 Originally Posted By: pakisho
Apparently Tommy (owner of the supra) ran the 228mph on the second day after switching to 18 inch wheels, which allowed him to hook in third.


Experiencowned. Well, we have shitty anecdotal evidence supporting both sides, but Newtonian physics supporting only 1.

I think you're wrong.
Somehow I missed this gold last time I read this thread.

Technically you are 100% wrong (IMO). Without some slip, it is not possible to get a car moving. With an auto, the torque converter slips. In a stick car, it neither the tires nor the clutch slips, either something breaks or the motor stalls; 100% of the time.

Whats Newton got to say about dat?


Or... You do a wheelie. You are right, something has to give for a car to go from a stop to motion.

Suspension setup has more to do with how well a car "hooks" than the tires do (to an extent). I have seen cars, similar horsepower, one with good suspension and crap radials, one with crap suspension and slicks, and had the car with the radial tires stay right at the door of the slicked up car.

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#1961994 - 10/18/07 11:24 PM Re: So a supra just dominated... [Re: ]
Mr. Knowitall. Offline
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 Originally Posted By: 98_1LE
 Originally Posted By: Mr. Knowitall.
 Originally Posted By: pakisho
Apparently Tommy (owner of the supra) ran the 228mph on the second day after switching to 18 inch wheels, which allowed him to hook in third.


Experiencowned. Well, we have shitty anecdotal evidence supporting both sides, but Newtonian physics supporting only 1.

I think you're wrong.
Somehow I missed this gold last time I read this thread.

Technically you are 100% wrong (IMO). Without some slip, it is not possible to get a car moving. With an auto, the torque converter slips. In a stick car, it neither the tires nor the clutch slips, either something breaks or the motor stalls; 100% of the time.

Whats Newton got to say about dat?


...


...


...


Are you kidding me? We are discussing the amount of forward acceleration a tire can generate, and you run in here all retarded yelling, "YOU NEED TO SLIP THE CLUTCH TO GET THE CAR TO START ROLLING!!!"

No shit dude; we are discussing the amount of acceleration the tire can generate when you're in gear driving.
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#1962765 - 10/19/07 10:10 AM Re: So a supra just dominated... [Re: Impulsive]
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 Originally Posted By: Impulsive
I think basic frictional physics don't apply to the tire/pavement interface.

We had a thread a couple years back and theoretically, the contact patch of the tire doesn't change frictional force, but we all know you hook better with bigger tires. Why? My guess is that tires, tire treads, asphalt are not theoretically ideal. They are not smooth and there is likely some additional frictional forces occuring beyond the normal force and coefficient.


Most physics professors will suggest it is due to the superior distribution of heat of the larger tire.

I will add that a larger tire will make up for the lack of the suspension's ability to control and dampen rapid suspension movements, by simply having more tire everywhere; more likely that some of it is hitting the ground. Its not a good way to go, but it is the case.

Ian
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#1962843 - 10/19/07 10:39 AM Re: So a supra just dominated... [Re: qksl2]
Impulsive Online   nohc
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Heat or no heat, you get more traction with a larger tire.

A physic professor is looking at is F=Nu (mornal force times a coefficient). I'm arguing that there are more forces at play than that, otherwise, pizza cutters would give good traction (even prior to any heat).
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#2057817 - 11/21/07 11:24 PM Re: So a supra just dominated... [Re: Impulsive]
00Formula
Unregistered



Old thread, but I just wanted to point out the amount of slippage in the Supra that trapped 228mph vs this TT Ford GT that trapped 222 mph.

Supra vid already posted:
http://www.youtube.com/watch?v=uU8DxXhwdSI

TT Ford GT
http://www.youtube.com/watch?v=VnoT0vXVnsE

For this effort I think the Supra had the superior launch, wheelspinrevlimiterbouncing.
The GT bogged on the 222.2mph run, though he tried to launch like the supra
and ended up in the dirt on the third try

Edit: Count the shifts too
Supra shifts 5 times, using all 6 gears
Ford GT shifts 4 times using only 5 gears


Edited by 00Formula (11/21/07 11:32 PM)

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#2058908 - 11/22/07 12:25 PM Re: So a supra just dominated... [Re: ]
Lost^
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that supra is badical
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