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911st 911st is offline
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
Mostly a 930 is old tec but the concepts are the same.

Better intercooling, larger more efficient turbo, freer flowing exhaust.

The motor is intake port limited and the cams are basically an RV TQ cam. Great for street work but limit gross HP potential.

CIS uses a pretty restrictive metering system that slows turbo response so lag is a thing that is lived with.

However your limitations as noted is the gross fuel delivery of CIS, the mechanical limits of the motor that will only allow so much pressure in the cylinders before the heads start to lift, and the thermal limits of an air cooled motor. Most limit there boost to .9 bar w the stock IC or 1 bar on a built motor.

AFR's are kept a little fat because CIS dose not have any real adaption capability and is not the best at balanced fueling per cylinder.

If you want a 500hp motor you might look to an EFI conversion right up front to keep from doing things twice.

Good luck.

Last edited by 911st; 07-19-2010 at 08:32 AM..
Old 07-19-2010, 08:26 AM
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