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DDDD DDDD is offline
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Join Date: Jan 2007
Posts: 1,077
You are in serious danger of destroying your engine if you have messed with the boost already. You should not turn the knob ANY further than what it was set at, and even then you don't know if the prior owner was a nutcase or if he cranked the boost to sell the car, or what.

You need to actually have a read out of the Air to Fuel ratio your CIS is running to know if you can safely run ANY level of boost. You can adjust all this, of course, to a degree, but basically when on boost your AFR should never get above 12.3 at the most lean spot in your rev range, and it should stay around 12.0 if possible.

Unless you are ready to do this all yourself, turn the knob down and go to a mechanic.

Do not go out on the highway in 4th gear and start driving around randomly tuning it.

Don't do anything but check the AFR and tune it correctly for a given boost level, and don't try it yourself if you are not experienced in this matter.

You need a Porsche specialist mechanic that you can trust to drive your car and tune it with a real AFR meter and maybe a dyno.

My boost knob will turn up to 2.2 bars. That would burn up my engine in minutes. You have no idea how quickly you are going to ruin your engine if you just start turning that knob.

They call it the knob of death for a reason. And most mechanics will stick it under the seat or somewhere else so a guy won't mess with it.

Last edited by DDDD; 03-08-2007 at 08:36 PM..
Old 03-08-2007, 10:05 AM
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