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911st 911st is offline
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
The 3.0 turbo has about 10% less exhaust energy than a 3.3 because it it 10% smaller and about another 2% less because of its lower compression ratio at low rpm.

However, if the stock compression is kept it can run almost 2 psi or .1 bar more boost than a 3.3 because of its lower compression ratio and stay at the same effective compression ratio. That is a 3.3 at 1 bar has about the same effective compression ratio as a 3.0 at 1.1 bar.

It also has a much better stroke and rod for increased rpm.

When you brake it down it kind of presents an interesting situation.

One can put a smaller turbo on it like a GT30 or K27-7200 with SC cams that are advanced for great drivability, full boost by 3k with the EFI, and a power band that makes peak HP at 5500rpm and starts loosing power around 6k rpm. This would also probably fit the 4 speed well.

Or go with a larger turbo like a GT 35 or HF, open up the ports, run C2 cams retarded a little or a custom cam and run 1.1 bar boost with plans to make peak HP at around 6500rpm through 7000 rpm or so. But have a fair amount of lag before with full boost around 3600rpm +/-.

Make any sense?

Last edited by 911st; 01-25-2010 at 09:23 PM..
Old 01-25-2010, 09:16 PM
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