I read many performance magazines regularly and have a seen many references to the low quality of California's 91 octane gas.

One magazine even went so far as to mention that No Cal gets better gas (even though it's all rated at 91).

This is causing many turbo upgrades to underperform in California due to the computers backing off timing. This could also cause dangerous detonation if the car or program is not tuned with this gas (or enough margin for this gas) in mind.

I blew the engine on my 94 Rx7 due to this exact issue. That car does not have a good knock sensor and is very weak overall compared to piston motors to begin with.

None of the above info is Porsche specific.

Does anyone have specific information reagarding this issue about the readily available CPU upgrade programs?

I guess if they are all designed with California gas to begin with, there are no real concerns. But if they are not, then a standard program may be dangerous or could at the very least be activating the knock sensor regularly in Cali.

 

No comments? come on guys......

 

mix with 100 octane, that will solve your problem.

 

speak for yourself.
Agree with Hamann. Mix it. I wouldn't think you would have that much to worry about the fuel with a M3 anyway.

 

I read here that two gallons of toulene will fix you right up....maybe just a rumore.

 

I agree that a mix with 100 is the best (toluene is very hazardous). With 91, I can sometimes hear a short burst of detonation at full boost at 5500 on a 100 degree+ day. That's before the ECU knows what's going on (i.e., I went from 70 to 100+ in less than 30 minutes and did not boost until I hit 100+ degrees).