DodgySam Posted November 25, 2009 Share Posted November 25, 2009 full 3'' system made a missive gain on my car I was told by everyone to get a 3" exhaust on the gtir. I rang turbo vehicles and then Steve Murch and asked them their opinion and they both said for a T28 to run a 2.5" exhaust. A gtir with a std turbo will get too much free spool with a 3" and will lose hp. For a wrx or an evo a 3" is perfect. An rb20det a 2.5", an rb25det and upwards a 3" So each engine is different...and for each size turbo its different. The best way to get an exhaust for a turbo car is to talk to someone who really truely knows what they are talking about...a professional if you will. And again this is the same with intercoolers and their sizings and flow capacities AND their piping sizes. The length of the piping makes a large difference too. On a quarter mile drag run most street cars with a fmic wont actually get any benefit from the intercooler being at the front of a car until after 3/4s of the way down the track. Heat wrapping intercooler piping will also effect their performance as keeping the radiant engine heat out of them will make the lag less and make them more efficient. A well flowing decent thickness top mount intercooler is excellent as long as the car is moving at more than 50kph. Its only at low speed and at a stop where they lose all usefulness. Like hot air in the engine bay also increases the amount of bogging a car has upon take off from a stop, so heat wrapping or ceramic coating exhausts makes your car bog down less on takeoff. Anyway IM TIRED AND AM STARTING TO not know if any of this is making sense at all...so i will end my post now. Quote Link to comment Share on other sites More sharing options...
H05TYL Posted November 25, 2009 Share Posted November 25, 2009 On a quarter mile drag run most street cars with a fmic wont actually get any benefit from the intercooler being at the front of a car until after 3/4s of the way down the track. Actually the intercooler acts as a heat sink, with no external air flow (car not moving) it will absorb heat from the air flowing through it until it's temperature rises to the same temp as the air flowing through it. Quote Link to comment Share on other sites More sharing options...
sentra Posted November 25, 2009 Share Posted November 25, 2009 too small wastegate trying to hold small boost figure on a small turbo bandaid fix restrict exhaust exit slow turbo down edit to dodgey sam Quote Link to comment Share on other sites More sharing options...
skyline1981 Posted November 26, 2009 Share Posted November 26, 2009 Also consider length of piping to get to the front coolers and back again. Long lengths will add to volume also. And then the piping often gets nicely warmed up again as it goes back thru the engine bay, nulling some effect from the intercooler. Sometimes the factory does know best eh! Quote Link to comment Share on other sites More sharing options...
kpr Posted November 26, 2009 Share Posted November 26, 2009 A gtir with a std turbo will get too much free spool with a 3" and will lose hp. what? bigger the better i say, within reason. then sort out your boost control if it overboosts, as someone else said. Quote Link to comment Share on other sites More sharing options...
d.p.n.s Posted November 26, 2009 Share Posted November 26, 2009 im running a pretty big fmic on my escort 350x450x70 (i think) with 3" in and outlets standard c18det and turbo and 2.5" intercooler tubes and there in pretty much no lag atall. and being a 1800 turbo the biggest i will go to on the exhaust will be 2.5" cheers dan Quote Link to comment Share on other sites More sharing options...
H05TYL Posted November 27, 2009 Share Posted November 27, 2009 also at anyone who thinks they have lag with a standard turbo. Try a T51R on a bridgeported 13bee.... Quote Link to comment Share on other sites More sharing options...
Simon Posted November 27, 2009 Share Posted November 27, 2009 "Ayop mate, answers anti-lag init?" Quote Link to comment Share on other sites More sharing options...
bubblegoose Posted November 27, 2009 Share Posted November 27, 2009 makes evos sound like rotors on fast forward Quote Link to comment Share on other sites More sharing options...
My name is Russell Posted November 27, 2009 Share Posted November 27, 2009 Sounds familiar ... is this what the WRC cars have i presume? Quote Link to comment Share on other sites More sharing options...
thegreatestben Posted November 27, 2009 Share Posted November 27, 2009 Yes, my assistant managers evo 6.5 has it, sounds mean in the car park but the animates staff aren't too pleased with it Quote Link to comment Share on other sites More sharing options...
Simon Posted November 27, 2009 Share Posted November 27, 2009 Is stupid unless on a rally car tbh. Must blow exhaust wheels to smithereens. Quote Link to comment Share on other sites More sharing options...
thegreatestben Posted November 27, 2009 Share Posted November 27, 2009 oh his is a rally car so thats ok Turbos blowing up are cheap compared to ralliart LSD's blowing up apparently Quote Link to comment Share on other sites More sharing options...
My name is Russell Posted November 27, 2009 Share Posted November 27, 2009 oh lol is that Piran? Quote Link to comment Share on other sites More sharing options...
eke_zetec_RWD Posted November 27, 2009 Share Posted November 27, 2009 lol u know pirian?? Quote Link to comment Share on other sites More sharing options...
My name is Russell Posted November 27, 2009 Share Posted November 27, 2009 Went to school with him and went model train club wiff em ... then we both got a phone call 8 odd years later from the police asking if one of the supervisors touched us because he was in jail for kiddy fiddling Quote Link to comment Share on other sites More sharing options...
thegreatestben Posted November 28, 2009 Share Posted November 28, 2009 LOL piran is my 2ic. gonna have to hit him up bout that did you go to hvhs or you mean primary? Quote Link to comment Share on other sites More sharing options...
My name is Russell Posted November 28, 2009 Share Posted November 28, 2009 Primary and intermediate Quote Link to comment Share on other sites More sharing options...
crooked Posted November 30, 2009 Share Posted November 30, 2009 Child fiddling... Everything within reason, put a front mount on a friends wrx, never do that.. top mounts work alot better for that application, intercoolers are designed to lose 2-4 psi , long piping creates lag, aswell as oversized intercoolers, i ran a custom 400x400x100 on my vr4 with 240+ atw and it worked wonders comared to my 700x600x70 off the shelf item.. Quote Link to comment Share on other sites More sharing options...
Simon Posted November 30, 2009 Share Posted November 30, 2009 Isn't society funny... Obviously the bigger the intercooler the more it cools the turbo. Quote Link to comment Share on other sites More sharing options...
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