TT (Mk1) Discussion Discussion forum for the Mk1 Audi TT Coupe & Roadster produced from 2000-2006

what size of turbo on TT225q???

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Old 12-12-2000, 10:05 AM
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It comes with the smallest KO4 they make!!! Really a KO3 Sport
Old 12-12-2000, 10:22 AM
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Whatever your friend has. I always thought the S4 was running higher boost than the 225.
Old 12-12-2000, 10:30 AM
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What do you think are setup is running?
Old 12-12-2000, 10:44 AM
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Default I've got a boost gauge, so I don't think, I know! Max peak is 23psi, max constant is 20psi

That's with version D K04 code. Version C would spike to 22psi and hold at 20psi.
Old 12-12-2000, 10:49 AM
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Default He has both, chipped is 1.0-1.1 bar, 14-16 psi, stock S4 is 0.8 bar or 11-12psi.

Don't forget twin turbos and a 2.7L V6.

There is no way with two small K03's two more cylinders and 0.9 more liter's it can have more lag. It is a much more powerful engine!
Old 12-12-2000, 11:18 AM
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Default What's different, the impeller, compressor or just the housing...?

'Cause if it's the housing then it's not a different turbo. Although the housing affects quite a bit....

A K04 is a K04, as far as I understand it. The housings can be different, however.
Old 12-12-2000, 12:24 PM
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Default Didn't think of it that way. I thought 2 turbo double the lag. :) I always thought the S4 was

running at 14psi. didn't think it was the same as the TT. Thanks for the info.
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