roboldham Posted November 6, 2002 Share Posted November 6, 2002 Okay folks - I have heard conflicting info as to the best custom or otherwise downpipes to get for late TTs (VVTi too) What are peoples views on this - pros / cons of options below: Custom CW downpipes Larger 3" custom downpipes Off the shelf downpipes Cheers! R Quote Link to comment Share on other sites More sharing options...
ChrisR Posted November 7, 2002 Share Posted November 7, 2002 Rob, I have Chris Wilson Decat pipes and i know that they do a good job in keeping the boost down, although am unsure if the results are a different on a VVTI. Chris's pipes and something like a Blitz/HKS exhaust will push the boost to 18 psi which is the limit on stock turbos. Some cars will run higher than that and will require a restrictor ring fitting, i would have thought too bigger pipes (3") would give too much boost unless you were keeping the stock cat back exhaust. Hopefully some of the other guys will offer some other comments. Regards Chris Quote Link to comment Share on other sites More sharing options...
Billy Posted November 7, 2002 Share Posted November 7, 2002 i to have cw down pipes with a blitz nur spec r i make 1 bar of boost i think all cars differ you will just have to try and see cw pipes are real top quality and chris is a great guy allways willing to give advise Quote Link to comment Share on other sites More sharing options...
GavinL Posted November 8, 2002 Share Posted November 8, 2002 Hi... If you are removing only one cat go with whatever you like... If it's both cats you will need to control boost levels then go with the CW pipes. I can't think of anyone else offering anything better for the J-spec especially the VVTI Quote Link to comment Share on other sites More sharing options...
roboldham Posted November 8, 2002 Author Share Posted November 8, 2002 Originally posted by GavinL Hi... If you are removing only one cat go with whatever you like... If it's both cats you will need to control boost levels then go with the CW pipes. I can't think of anyone else offering anything better for the J-spec especially the VVTI Well I have been to see Leon and he showed me some custom 3" downpipes that he flogs (not Wison specials!) - and I plan to do a full de-cat He raves about them but what concerns me is that I dont want to always run up to my boost limit for stock TTs all the time. So - if I went for these swanky 3" jobbies and went for a full de-cat - would't I be able to control the boost (ie. keep it lower, even down to standard levels) with a Boost Controller - then just whack it up when its funtime? Or am I effectively going to be maxing out all the time with a full-decat and 3" DPs, boost controller or not? R Quote Link to comment Share on other sites More sharing options...
GavinL Posted November 8, 2002 Share Posted November 8, 2002 Originally posted by roboldham Well I have been to see Leon and he showed me some custom 3" downpipes that he flogs (not Wison specials!) - and I plan to do a full de-cat He raves about them but what concerns me is that I dont want to always run up to my boost limit for stock TTs all the time. So - if I went for these swanky 3" jobbies and went for a full de-cat - would't I be able to control the boost (ie. keep it lower, even down to standard levels) with a Boost Controller - then just whack it up when its funtime? Or am I effectively going to be maxing out all the time with a full-decat and 3" DPs, boost controller or not? R I would imagine that Leon uses a restrictor ring to keep boost to pre determined level (around 17psi). Boost controllers are designed to increase boost although Leon has some success with trimming J-spec cars with the Blitz DSBC. IMO the difference between stock boost and 17psi really isn't so much as to really worry about on a day to day basis, it doesn't represent such a big jump and with RLTC fitted the performance is perfectly useable all year round. Quote Link to comment Share on other sites More sharing options...
ChrisR Posted November 8, 2002 Share Posted November 8, 2002 I believe you cant lower boost with a boost controller, just increase it. Anyone??? Edited: Whoops someone beat me to it. Quote Link to comment Share on other sites More sharing options...
roboldham Posted November 8, 2002 Author Share Posted November 8, 2002 Originally posted by GavinL I would imagine that Leon uses a restrictor ring to keep boost to pre determined level (around 17psi). Boost controllers are designed to increase boost although Leon has some success with trimming J-spec cars with the Blitz DSBC. It seems you are correct. I rand Leon and he said that if the car demonstrated boost spikes then he drops in a drilled restrictor plate - keeping the boost down to stock - then you can wind it up with the boost controller. Cool. R Quote Link to comment Share on other sites More sharing options...
Matt Harwood Posted November 8, 2002 Share Posted November 8, 2002 Originally posted by Chris Rimes I believe you cant lower boost with a boost controller, just increase it. Anyone??? Edited: Whoops someone beat me to it. Definately possible. Leon reduced mine using the DSBC. In Leons words "it's a boost CONTROLLER" Quote Link to comment Share on other sites More sharing options...
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