[timo1980]

As the title says, I am wondering if I can switch to the sport or aggressive map if I were to mix 3 gallons of e85 in my tank? Only mods are an accessport, and a bmw performance exhaust.

[kiwi29]

it'd boost your octane rating to about 98 oct. if youre going with 3 gal. e85 + 13 gal 91
dont know too much about the cobb tuning products but i just wanted to let you know what your oct rating would be

[VNeBLOB42]

you should be fine. I am on 20% E85 and it fixed all timing corrections on S1 Sport. I have not bumped up to Aggressive due to the high Charged Air Temps (even though aggressive would be fine, just a preference). Still on stock IC.

Do some logging, 3 pulls in third gear WOT to 4th. Then change to S1 Aggressive (break in the new MAP after a few WOT pulls) and then do some more 3rd Gear pull logs. If your timing looks good, then i say you are good to go. Post the logs on the COBB thread to get some help on your logs.

E85 is amazing stuff.

check out my thread, some good info.

http://www.e90post.com/forums/showthread.php?t=716743


Here is a good web site to calculate E85 mixture. E85 is about 105 octane, but is less dense, thus takes more consumption.

http://www.intercepteft.com/calc.html

(see bottom calculator for mixing)