Re: 100 Octane VS 91 Octane
I used to do two tank fulls of 100 octane when im doing a track day. First tank to get ECU to adjust and second tank is for day of road racing.
I stopped doing this after the track day I did with Timelord, HDDP, and X'ed at Cal Speedway.
During a session, X'ed was behind me and when we hit the oval where you normally go WOT, he said that a big cloud of black smoke (guessing carbon build up) came out of my exhaust. I assumed this was carbon build up from running rich.
So question is, does running on higher octane on a regular basis cause your engine to run rich thus the carbon build-up?