Originally Posted by dubcac

I wouldn't go over 11.0:1 or so without a tunable ECU like hondata/etc. I've seen 12:1 run on pump gas with hondata...but a lot of timing was pulled out. I had a friend running 13:1 on the street, and he had to mix 2 gallons of Toluene with each tank of gas...and he was running a J&S Safeguard.