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911st 911st is offline
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
Just a few thoughts.

Dose your car have an O2 sensor? Is it hooked up? A lot of 930 owner's disconnect it in there search of better throttle response. With a good working O2 your AFR will be adjusted by the Lambda computer at cruse and should get you better MPG.

You might check you idle CO / AFR's. I think stock is about 1% or 14/1 and many bump it ti around 3% or 13.5/1AFR in search of better throttle response or increased fuel delivery if running a 1 bar spring.

If you have good quality fuel and are running stock boost you might, might be able to dial in some added ignition advance for a possibly better throttle response and MPG.

A good sport muffler can help to.

PS: Did your mechanic check your CIS system pressure and more importantly, control pressure?

The WUR determins your control pressure which directly effects your Air Fuel Ratios. If it is not right you might set CO/AFR at idle and be way off at cruse. Even the Lambda computor may not be able to adjust around it and you will be fighting a losing battle. Investing in a good wide band O2 & AFR gauge is a very good idea with CIS. Also it is good maintaince to have your injectors checked and cleaned.

Last edited by 911st; 10-11-2010 at 08:50 AM..
Old 10-11-2010, 08:40 AM
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