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#1
09-04-2005, 09:32 AM
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exhaust/velocity
Hey, assume that i made a quick disconnect infront of my catalytic converter on my 97 sl. I heard that u could gain around 20hp instantly, and also heard that u risk burning valves because u decrease exhaust velocity, and backflow pressure< which is the good thing? If someone could tell me if this is ok, and the other exhaust options on a naturally aspirated 3000 thatd be great.
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#2
09-04-2005, 09:47 AM
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those kind of exhaust lengths are for pro drag cars man. yes you would increase some HP, doubtfull it be 20 more though, thats not likely from a 3.0 V6 but youd deffenetly have some consequenses. the car might not even idle correctly without backpreasure, you might burn valves, you'd deffenetly have tons of back-fire, predetonation.
why do you think race cars have thier engines fully re-built after a few runs?
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 06 GTO: SLP Longtubes, SLP Loudmouth II K&N intake, Ported Intake Manifold, Ported Throttle body, MAF screen delete. Tunned by Jeremy Formato. 381whp, 376wtq. 07 Ion Redline: Bone stock w/ factory Competition package. In response to a race my wife had while pregnant with our baby: Quote:
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#3
09-04-2005, 11:59 AM
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Re: exhaust/velocity
If your turbo you will be fine.
If your NA you should still be fine, but be ready for backfiring everytime you let off the gas. Race engines are rebuilt every run due to the amount of power they are making. The parts wont hold up for more than a run or 2.
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A few "bolt on" mods, a couple "cut, smash, hammer, weld, etc" mods, and a couple "why the hell do I need this/what the hell is this" weight reductions.
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#4
09-04-2005, 05:53 PM
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Re: exhaust/velocity
I just hollowed my cat yesterday and i have smoke coming from the exhaust now. Any ideas why? I did notice a big difference in the take off power though.
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'91 3000GT SL K&N FIPK Homemade ground wire kit NGK Iridium plugs MSD 8.5mm wires homemade test pipe Its nice to have an uncle with experience and a shop! Hence all of the homemade shit!  COMING SOON 3sx lightweight pulley Intrax lowering springs 2 Seat Conversion
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#5
09-05-2005, 12:38 PM
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Re: exhaust/velocity
Could be the remaining little bits of honeycomb burning up, or it could be excess unburnt fuel getting burned in the exhaust.
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96 3000gt vr4 -K&N FIPK -Proboost mbc -Cusco front + rear strut bars -Greddy type-s -ATR downpipe -no cats -15Gs, 3sx aluminum pulley, FMIC, SAFC, walboro pump, EVO 560ccs, and Meth Injection Kit all waiting to go in shortly. Your 1996 Mitsubishi 3000GT VR-4 is the 92nd out of the 315 that were made that year. Only 21 of which are exactly identical.
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#7
09-06-2005, 09:30 PM
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What whp and qtr mile gains could u expect from 3sx's long na headers and straight cat? on a stock 97 sl.
Also i cant find the stock quarter mile time for the 97 sl i would assume it is aroung 15.2 -manual?
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#8
09-06-2005, 09:36 PM
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Re: exhaust/velocity
Yeah, mid 15s probably. I know 14.9 has been done on a stock SL. As far as gains with the new long-tube headers, I honestly don't know if anybody has dynod or raced with them yet. I wouldn't expect more than 10-15 tops, but that again is just a guess.
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96 3000gt vr4 -K&N FIPK -Proboost mbc -Cusco front + rear strut bars -Greddy type-s -ATR downpipe -no cats -15Gs, 3sx aluminum pulley, FMIC, SAFC, walboro pump, EVO 560ccs, and Meth Injection Kit all waiting to go in shortly. Your 1996 Mitsubishi 3000GT VR-4 is the 92nd out of the 315 that were made that year. Only 21 of which are exactly identical.
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