Quote:
Originally Posted by Taylor95
Going back to the original topic does anyone have input on doing something more reasonable such as running a 9:1 ratio on regular gas? I think doing that is fairly easy if I get the right cam. Right now my vehicle is at 8.7:1. Under normal circumstances 9:1 would require midgrade.
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Talk to an engine builder. If they know your engine platform well they will pretty much tell you what will run on xx octane or even e85 (cheap race gas). Oops they talk about what the max comp you can run on each fuel is with the pay to play video.
I'm a Ford/Chevy guy so LS limit for 87 octane is 10:1. Ford limit for 87 on the 2011+ Coyote is 11:1. I typically won't really mess with 93 though because it cost like 20% more in my area and if you run the thermodynamic formula bumping up the comp up one point (say... 10 to 11) to run 93 is only going to get you 2.5% gain (in efficiency) (The bump in comp and 6 points of octane would be around 6% gain power) .