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Turbonut
Join Date: Jun 2009
Location: Estonia, Europe
Posts: 1,261
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I would leave the 8.5 CR as is and use max 1.0 bars of boost. That would make a VERY quick car and not even compareable to factory 930's with their on-off type of power curve.
You can do that because of EFI+twin-plug.
Shimming the cylinders is bad idea because you are losing squish area which is pretty important to prevent detonation and improve performance. If you would be stuck on 10+ CR and those pistons, then shimming would be reasonable but with 8.5 CR I wouldn't even consider it.
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'83 924 (2.6 16v Turbo, 530hp),'67 911 hot-rod /2.4S, '78 924 Carrera GT project (2.0 turbo 340 hp), '84 928 S 4.7 Euro (VEMS PnP, 332 HP), '90 944 S2 Cabriolet
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