Burny Posted August 18, 2011 Share Posted August 18, 2011 After speeking to Ricky he says i will need a 3" exhaust sytem if i am to run 350bhp, some people are saying i will lose alot of back pressure??? opinions????? and if i was to have a 3" exhaust system the downpipe that i get with the zisco manifold is 2.5" so i take it this will be useless and il need Ricky to fabricate me a 3" downpipe? Quote Link to post Share on other sites
Russleh Posted August 18, 2011 Share Posted August 18, 2011 i dont know all this stuff but i remember a build a while ago of a guy who was running big power and hit a wall at like 320 and it was exhaust restriction. soon as it was 3" it was gains ahoy Russell Quote Link to post Share on other sites
Burny Posted August 18, 2011 Author Share Posted August 18, 2011 i dont know all this stuff but i remember a build a while ago of a guy who was running big power and hit a wall at like 320 and it was exhaust restriction. soon as it was 3" it was gains ahoy Russellohright i see, gdgd mine is like 2.25 at the moment so need it sorting, i think im gonna have to have a 3" downpipe made up though which will probably cost a fair bit Quote Link to post Share on other sites
Driver Posted August 18, 2011 Share Posted August 18, 2011 After speeking to Ricky he says i will need a 3" exhaust sytem if i am to run 350bhp, some people are saying i will lose alot of back pressure??? opinions????? and if i was to have a 3" exhaust system the downpipe that i get with the zisco manifold is 2.5" so i take it this will be useless and il need Ricky to fabricate me a 3" downpipe?May i ask why your wanting to keep backpressure ?on N/A yes it can help alot however on a turbo car the exhaust is litterally just to get the gasses out ASAP, in the turbo honda scene in the states alot of people will just run a bit of pipe to the ground or even out of the bonnet !ie Remember the less back pressure the better on a turbo applicationAnd stepping down from 3-2.5 after downpipe isnt a massive issue as gas speeds will be high down there anyway, its getting the gas out of the turbo thats important, although a 3" exhaust would help massivly at them power levels. Quote Link to post Share on other sites
wssoR Posted August 18, 2011 Share Posted August 18, 2011 I run a 2.5 into 3 inch decat and then 3inch all the way through, running 190bhp at the time, no loss In back pressure Quote Link to post Share on other sites
Burny Posted August 19, 2011 Author Share Posted August 19, 2011 I run a 2.5 into 3 inch decat and then 3inch all the way through, running 190bhp at the time, no loss In back pressureok awsome, think il go for the 3" all the way through then, gonna go fo the racetech manifold aswell now as it looks like it has slighlty bigger tubing on it compared to others, was your downpipe custom made? Quote Link to post Share on other sites
wssoR Posted August 19, 2011 Share Posted August 19, 2011 It is mate yeah Quote Link to post Share on other sites
Burny Posted August 20, 2011 Author Share Posted August 20, 2011 It is mate yeahok sound niceone il have to get ricky to custom make the whole lot then! more money................ lol Quote Link to post Share on other sites
Glanza_cl Posted August 21, 2011 Share Posted August 21, 2011 As Drivers said, the less restrictive the better... the more flow you can get post turbo the better it will be. 3" would be ideal for that power level but anything from 250-300 2.5 imo isnt to bad. Quote Link to post Share on other sites
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