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de cat pipe
#1545172
21/07/2015 21:03
21/07/2015 21:03
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Evo8fq300
Unregistered
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Evo8fq300
Unregistered
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hi all, having read various threads about de cat pipes I am still a little in the grey about true gains from putting a de cat pipe on my 20v turbo. I have a Front mounted intercooler, upgraded turbo, exhaust system, blow off dump valve, gtec 2 chip, cone air filter. what
can someone clarify if I was to put a de cat pipe on what would I gain in relation to bhp, torque etc...?
cheers in advance
Phil
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Re: de cat pipe
[Re: ]
#1545294
23/07/2015 14:21
23/07/2015 14:21
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Joined: Dec 2005
Posts: 17,367 Staffordshire
Nigel
Forum veteran
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Forum veteran
Joined: Dec 2005
Posts: 17,367
Staffordshire
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You'll also get stronger boost at higher revs, again, due to lower back-pressure
Quite simply, at anything over about 5,000 - 5,500 rpm, the turbo runs out of puff, as it struggles to overcome the backpressure in the downpipe (partly caused by the downpipe being small and partly because the cat is restrictive)
Removing the cat removes part of the restriction and allows better breathing - you'll notice you can reach 6,000+ rpm before the boost starts to tail off
Its at this point that you start chasing each new weak point as it becomes apparent - what next? bigger downpipe? - that'll sort the weedy standard downpipe's restriction. Damn, now the standard 2" V-Band adapter to the turbo is the restriction - new turbo? Great, now its the injectors, etc etc ad-infinitum
Its a slippery slope....
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