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I'm running a 12.5:1 A/F ratio (WOT), but it was on 91 octane. Surprisingly, when I drove to Ohio and got back to 93 octane, my A/F ratio was at 12.2 A/F (WOT) which is a negligible difference. I'm literally shooting black soot out of my exhaust though with the A/F that low and when the day comes to get it retuned, I'm going to go with 13:1 A/F Ratio. According to all of my research, I'm going to get better power numbers that way anyway.
I haven't really told this on any other post, but I had Honda Bob tune the car for a highway A/F ratio of 16.5:1 to 17:1 at a steady pace (this is NOT at WOT). The car seemed was getting better gas mileage and temperatures across the board did not raise, but instead, stayed consistent and safe. The reason I haven't said anything thus far was because I know that people would jump on me immediately for running such an unsafe fuel ratio, but I did it for 7 months with no negative results. Even the spark plugs and the ceramics looked good. No misfires have happened either (besides one that happens at WOT past the 6,000rpm range lately). But those are a result of something being wrong with my distributor.
If I were you, while you dyno the car, try to go for as close to 14.7:1 A/F ratio and compare power numbers to see what difference it makes, you might be pleasantly surprised with the results!
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