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      12-13-2013, 06:08 PM   #61
Boss330
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Quote:
Originally Posted by solstice View Post
50% sounds high but if you know the psi at 650 hp and that this is with standard fuel it would be easier to compare. The GT2 RS as mentioned before makes similar power at similar displacement with 23 psi and the same 9:1 compression rate. That should be about 2 psi extra on the S55 at 10.2:1 compression rate. If the GT-R with 650hp runs 23psi as well it's an increase of 10 psi from stock. 2/10 is 20%.
The 997 Turbo S has 520hp from a 3.8l with 9.8:1 CR. There are several tunes for it like Switzer etc. The first stage is 600hp, then 700 and 800 on street gas.

http://switzerperformanceinnovation.com/web_en/switzer-cars/switzer-porsche/porsche-997/

The 600hp stage would be 470hp on a 3l and the 700hp stage would equal 550hp on a 3l. The 800hp street fuel stage would equal 630hp on a 3l engine (the last two stages has upgraded turbos, but still 9.8 CR).

So, it's definitely doable to get higher performance even with a high CR turbo engine!
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