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hobieboy hobieboy is offline
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Join Date: May 2002
Location: Up North
Posts: 1,446
My 2 cents...
The 1st thing I would research is your static compression ratio. Factory 3.3 uses 7.0:1 compression and runs 14psi of boost. 934/935 runs 6.5:1 compression for 1.4bar boost (& the engine lasts 24 hours). I think the general rule of thumb is boost = 1.5 times static compression. So running 8.7:1 might be high IMHO, depending if you are using it on track or street (where you won't even get 10 sec boost at a time).

I don't have experience with OBX. But, the WG does come off the header. WG can vent via straight pipe to atmosphere. You'll also want/need a BOV (between air filter & butterfly somewhere).

I am also using MS-1 extra so the control part should be fine I'm also using Carrera FPR and stock 930 fuel pumps. With 550cc injectors, I'll get to 85% duty cycle at max boost & RPM on track.

Good luck & have fun with the project...
87 930 K27HFS/B&B/Twin-Plug... Megasquirted
Old 09-12-2008, 04:58 AM
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