Sorry to post this here guys, but I know I will get the experienced answer I need. OK so its not a P-car but it is a TT

I checked my VIN and my CL600 is a "California" car, as well I am almost positive my ECU tune was for 91 octane as it came from South Dakota. In its current tune its making 492/572 at the wheels but Im in MD where we have 93 at every pump. My question is this...should I get my ECU retuned for 93 octane to squeeze that last bit of HP out of it, wouldnt that be optimal? thanks guys.

j

 

yes you will be able to run different timing and A/f mixtures.

 

thanks for the response. Im definitely making way more than stock, i wonder how much HP i could stand to gain with a retune.

 

You can always just use the extra octane as insurance. Whenever I have had a race file , I like it to be tuned a bit lower than the actual fuel rating I am using to take into consideration fuel quality issues. I run a 100 octane file on 104 at the track just to be safe. You will get better performance numbers with a few extra octane , but I choose not to push the envelope for safety sake. Kevin