#182608 - 02/16/06 06:06 PM
2.5 vs one of my custom 3 inch exhaust (dyno graphs)
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Turbo-charged
Post Master
Registered: 07/02/02
Posts: 2386
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this should answer all of your questions on whether or not a 3 inch exhaust is worth while on a turbo car. i previously tuned the car on 12psi and 15psi. with the new exhaust system i couldnt get the boost to go below 15psi.....(lovefab manifold with 38mm wastegate) so it made a perfect over lap of 15psi of 2.5 inch exhaust and 15psi 3 inch exhaust.
car is a stock bore H22 with love fab manifold, stock intake manifold, 2.5 downpipe, a custom 3 inch exhaust i did.....greddy intercooler with very restrictive intercooler piping. 93 octane pump gas. and stock cams
Absolutely NO changes done to the car other than the exhaust. NOTHING.
the little dip in the midrange is from very rich air/fuel in that area. the MSD took a crap during the dyno session so i dint get to clean that up. very minimal timing and rich and safe air fuel. needless to say, he was very pleased with his new exhaust system 
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#182609 - 02/16/06 07:06 PM
Re: 2.5 vs one of my custom 3 inch exhaust (dyno graphs)
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4doorEG
Post Master Sr
Registered: 11/23/01
Posts: 6113
Loc: Overland Park, KS
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That's only because it's a vtec engine 
Was this the dual exhaust setup you did for the car?
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#182610 - 02/16/06 07:13 PM
Re: 2.5 vs one of my custom 3 inch exhaust (dyno graphs)
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Turbo-charged
Post Master
Registered: 07/02/02
Posts: 2386
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#182614 - 02/16/06 10:49 PM
Re: 2.5 vs one of my custom 3 inch exhaust (dyno graphs)
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SamuraiSam
Post Master Sr
Registered: 07/29/02
Posts: 8828
Loc: Bellingham, WA
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Things don't work quite the same with superchargers.... freeing up backpressure doesn't have the same benefits as on an app. where you're pushing a turbine.
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#182615 - 02/17/06 01:15 AM
Re: 2.5 vs one of my custom 3 inch exhaust (dyno graphs)
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SiR Steel
Post Master Sr
Registered: 06/18/01
Posts: 8393
Loc: West Vancouver, BC, Canada
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Thanks for the advice, guys. I'll stick with what I have.
_________________________
2018 BMW M2 6MT
1977 British Leyland MINI Modded 1380cc LHD
2005 Piaggio Vespa ET2 Modded 70cc
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#182617 - 02/17/06 06:29 AM
Re: 2.5 vs one of my custom 3 inch exhaust (dyno graphs)
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OLDNAME
Post Master Sr
Registered: 12/13/99
Posts: 5436
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nice..shit over 70whp. but is that due to higher boost level.
man I wish I can bare the noise of the 3' dp though. arrrh.
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One of the last Si w/ BPU
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#182618 - 02/17/06 07:28 AM
Re: 2.5 vs one of my custom 3 inch exhaust (dyno graphs)
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Turbo-charged
Post Master
Registered: 07/02/02
Posts: 2386
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no the boost level is exactly the same, 15psi on those 2 runs.
with the smaller exhaust i had a "low boost" and "high boost" settings, with the wastegate placement i was unable to go below 15psi this time.
i took the old 15psi chart and over lapped the new 15psi chart, so no change it boost.
the same 2.5 inch downpipe was used for both runs you see as well.
Edited by Turbo-charged (02/17/06 07:28 AM)
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#182621 - 02/17/06 09:09 AM
Re: 2.5 vs one of my custom 3 inch exhaust (dyno graphs)
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Buzzbomb
Sr Member
Registered: 11/02/01
Posts: 1197
Loc: Bryan, Ohio, USA
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What about low boost applications like 5-8 psi? Due to budget reasons, I'm going to run the sucky Greddy downpipe and a 60MM (2 3/8") exhaust. I want to upgrade the downpipe to a 2.5 in the future, but not sure about the exhaust.
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#182623 - 02/17/06 12:54 PM
Re: 2.5 vs one of my custom 3 inch exhaust (dyno graphs)
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Buzzbomb
Sr Member
Registered: 11/02/01
Posts: 1197
Loc: Bryan, Ohio, USA
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I don't know about that. A half inch might stall the car. 
I would love to see a comparison test on a car runing 7psi.
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#182624 - 02/17/06 12:55 PM
Re: 2.5 vs one of my custom 3 inch exhaust (dyno graphs)
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baellremoteuse
Member
Registered: 10/07/05
Posts: 840
Loc: Michigan :)
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You like it when other people waste their time for your satisfaction, huh.
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Lead by example *67, not with threats.
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#182625 - 02/17/06 01:47 PM
Re: 2.5 vs one of my custom 3 inch exhaust (dyno graphs)
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TypeSlow
Post Master Jr
Registered: 01/14/02
Posts: 1646
Loc: Port Charlotte, FL
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good stuff TC. how about anything on 3" exhaust and 3.5" or 4" e-cutout?
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TakE iT tO thE tRacK!!!
2000 Si ~~~ UNDER CONSTRUCTION ~~~
Coming Soon: GT3586 and a buttload of other goodies!!
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#182626 - 02/17/06 02:43 PM
Re: 2.5 vs one of my custom 3 inch exhaust (dyno graphs)
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Buzzbomb
Sr Member
Registered: 11/02/01
Posts: 1197
Loc: Bryan, Ohio, USA
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Quote:
You like it when other people waste their time for your satisfaction, huh.
And what is that suppose to mean?
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#182631 - 02/18/06 05:14 AM
Re: 2.5 vs one of my custom 3 inch exhaust (dyno graphs)
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SamuraiSam
Post Master Sr
Registered: 07/29/02
Posts: 8828
Loc: Bellingham, WA
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any coupe/sedan 96-00 civic can use the same exhaust IIRC.
Resonator would be a great addition.
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#182632 - 02/18/06 02:00 PM
Re: 2.5 vs one of my custom 3 inch exhaust (dyno graphs)
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SiRocket
Post Master Sr
Registered: 03/05/00
Posts: 4795
Loc: [ downtown los angeles. ]
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my 3inch on my vortech was horrid, but thats because it sounded like a damn all motor car as it is in between the mix... lol... can't wait to have my 3inch d/p going into that exhaust now
_________________________
Ricky..- 2000 Civic Si (ebp) Laskey, Benson, Full-Race, Jb Weld, gt3582r powered | 628whp - 370wtq - 2005 Scion Xb (blue.o.p) w/ 121,000+ miles | turbo sleeper in progress - 1987 Dodge Conquest Tsi w/ 65,000 miles | 1.0bar on an 18g RIP Earl Laskey djRICKY.jay
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#182633 - 03/20/06 08:49 PM
back from the dead.
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vspecsir
Poster
Registered: 03/25/03
Posts: 266
Loc: 808 State
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Well I finally upgraded my exhaust. Prior to this upgrade, I was using a Greddy SP, the baffle in the muffler is blown, and I have a blown cat too. I ended up buying a 3" Kteller exahust, 3" test pipe, 18" resonator, and The 5x8 magnaflow muffler from kteller, bolted up to a spoolin performance 3" downpipe...  This thing is F'ING LOUD!!!!! I dont know how your guys can drive with the Kteller setup, the interior is louder then the exterior. Low rpm cruising @ 2500-3500rpm is just drowing! the power increase is insane though, a much more noticable difference and I"m only running 6psi on a greddy kit. I need to come up with a solution, or I'm selling this thing too loud! This is my daily driver so it's irritating.
here's a vid (cold start & idle)
http://videos.streetfire.net/video/FB7316E7-E86A-41FF-8343-7969FA24F56A.htm
Edited by vspecsir (03/20/06 09:59 PM)
_________________________
00' Civic Si L'dat
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#182637 - 03/20/06 10:00 PM
Re: back from the dead.
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vspecsir
Poster
Registered: 03/25/03
Posts: 266
Loc: 808 State
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chewbaccasi, didn't you get a vibrant 3"? I think you posted a vid of it before but I dont remember. no resonator, sheesh... your crazy. maybe it's because I'm used to Greddy exhaust systems
_________________________
00' Civic Si L'dat
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#182639 - 03/20/06 11:19 PM
Re: back from the dead.
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2000Sivortech
Jr Member
Registered: 09/15/05
Posts: 378
Loc: orlando,florida usa
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thermal 3" is super quiet even with no resonators or cat
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#182640 - 03/21/06 12:01 AM
Re: back from the dead.
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ChewiSi
Post Master Sr
Registered: 11/15/03
Posts: 8376
Loc: Colorah rah
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heres the link again, its not as loud from the outside as it is on the inside. Drones on the inside.
revving
http://media.putfile.com/DSCF288337
brake boosting= hell on clutch?
http://media.putfile.com/rollin263
Quote:
thermal 3" is super quiet even with no resonators or cat
i think its the muffler on the thermal exhaust that quiets them down.
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