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      07-14-2012, 10:10 AM   #57
dfv2's Avatar

Drives: 2009 CTS-V
Join Date: Apr 2010
Location: Upstate NY

iTrader: (3)

Originally Posted by benzy89 View Post
Well your timing will be a lot better, but it's not like your car will go from the stock 300/300 tune to 320/330
Benz, there's quite a difference in torque between 6 degrees at X load vs 10 degrees at x load especially in the upper rpm's.

On ACN swill, you may very well be missing out on 20 whp at 6000 rpm. In my observations the stock DME is designed to ride the knock sensor/correction system and generally take advantage of whatever octane is available. On good 93 octane I still pull timing across cylinders on Stg0.

What I should do is run my tank down to vapor, fill with 1.5 gallons crap 91 from a mom/pop and do a few pulls. Then add 1 gallon of e85 and do a few pulls. I'd compare the logs and the resulting csv dyno's. At least it would help us understand the influence of cleaning up timing on the stock rom with e85.