China Man Posted April 9, 2005 Share Posted April 9, 2005 What the difference in using a 2.5" and a 3" decat pipe on a Jspec? Does it really matter what size diameter, surely a restrictor ring will limit the gas flow more than the pipe size right? China Link to comment Share on other sites More sharing options...
Alex Posted April 9, 2005 Share Posted April 9, 2005 Sometimes you canget away with a 2.5 and no restrictor ring...but you'll never get away with it on a 3"...so you can either try for decatted without a ring or just know you'll have to get a ring...pays your money etc etc Link to comment Share on other sites More sharing options...
Chris Wilson Posted April 9, 2005 Share Posted April 9, 2005 A 2.5 inch pipe will still need restricting so why spend more on a 3 inch? A 2.5 pipe will flow enough exhaust gas flow for at least 500 BHP on a turbo car, with no real restriction. People are jumping on a bigger is better bandwagon for fashion reasons at the moment, IMO. I am spending a HUGE amount of money building a trick RB26 Skyline engine for myself with a desired 600 BHP. I won't be using a 3 inch system, let alone a 4 inch. Link to comment Share on other sites More sharing options...
dude Posted April 9, 2005 Share Posted April 9, 2005 A 2.5 inch pipe will still need restricting so why spend more on a 3 inch? A 2.5 pipe will flow enough exhaust gas flow for at least 500 BHP on a turbo car, with no real restriction. People are jumping on a bigger is better bandwagon for fashion reasons at the moment, IMO. I am spending a HUGE amount of money building a trick RB26 Skyline engine for myself with a desired 600 BHP. I won't be using a 3 inch system, let alone a 4 inch. Does the wife also agree with this way of thinking Chris , smaller is better I have to disagree the Starions i used to work on showed a massive improvement just from fitting a bigger downpipe and i KNOW my car spools quicker than others with similar turbos (im talking the 67 i started with ) and ive got the big HKS cams !!!!! Dude Link to comment Share on other sites More sharing options...
dude Posted April 9, 2005 Share Posted April 9, 2005 Re the cost im getting some 3" double de-cats made up and there is virtually no difference in price So the dude philosophy is 'Go Big or stay at home'!!!!! Dude Link to comment Share on other sites More sharing options...
supra dan Posted April 9, 2005 Share Posted April 9, 2005 Re the cost im getting some 3" double de-cats made up and there is virtually no difference in price So the dude philosophy is 'Go Big or stay at home'!!!!! Dude how much are they dude? Link to comment Share on other sites More sharing options...
China Man Posted April 9, 2005 Author Share Posted April 9, 2005 thank you Chris and dude, I guess if my car is standard and I am going to install a restrictor ring there will be no different in 2.5 or 3" There are a few pipes for sale here therefore I ask the question. many thanks China Link to comment Share on other sites More sharing options...
dude Posted April 9, 2005 Share Posted April 9, 2005 how much are they dude? If icant make the cheapest on the BBs i wont bother !!!! They will all come with 2 sizes of restrictor at no extra cost .Prices soon on the new website .As soon as thats up and running it'll be in the traders section along with all the other products , cages etc Dude Link to comment Share on other sites More sharing options...
imi Posted April 17, 2005 Share Posted April 17, 2005 Whats the standard piping on the Jspec Sup TT?...looks either 2.25 or 2.5... Bearing that in mind, if one were to remove the CATs but still keep the cat-back standard piping then a restrictor ring wouldnt be needed? Link to comment Share on other sites More sharing options...
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