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decating thema

Would it increase the effect on my thema 16v turbo if i de-cat it? and how much?
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what about the q4? it's almost the same engine.
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Join Date: Jan 2003
Location: A Twisted Mind..........
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A de cat pipe gives approx 5 bhp more on a standra motor so probably be more on a turbo
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One of the things you need to take into account when you decat a turbo engine, the back pressure is going to make the turbo spin up quicker as the pressure differential across the turbo's impeller is going to be larger, this will give you a much better midrange torque curve without doing anything else. However the downside of this is that if you turbo has seen quite a few miles then the seals are not going to be as good as they should be, and as such you may get oil being blown out through the seal and burnt in the exhaust, when you take your foot off of the accelerator, which is good if you are trying to lay a smoke screen but not so good when you pull up to the traffic lights with your window open.


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