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Old 12-10-2003, 10:11 PM   #160
Scooby Specialist
Member#: 40501
Join Date: Jul 2003
Location: Paris, FR
2005 Decathalon 21sp
One WheelSeanPower


Not necessarily.

I'd be really careful hitting 17psi on pump gas without tuning fuel. Even then, I'd be really careful hitting 17psi on the stock turbo. It can be done, but it's just not efficient. Pull some boost out - run 16 perhaps. Remember, when it's colder, the air is more dense. When the air is more dense, it's holding more O2 at a given boost level AND flow rate boosting your AFRs.

Also, don't tune for MAX boost in 3rd. If you do, I can practically guarantee you will knock in 4th and 5th, under higher loads. 17psi in 3rd can easily be 18 in 4th.

Since you're seeing knock, the last thing you want to do is add timing.

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