What should my air fuel ratio be? I just messing with my fuel pressure right now so I can drive with the methanol. Widebanding it as soon as the meth kit goes on. Boosting 12 psi for now.. So what should I go for on the wideband?

 

no one??

 

I run a progressive system from alkycontrol.com and the guy that makes them (Julio) said 11.7-11.8ish range works best.

 

thank you!

 

To me, that sounds too/pig rich, although adding alcohol causes the effective A/F ratio of combined fuels, to be equivelantly slightly leaner, it also slows down the burn speed. BTW, gasoline makes for a poor choice as a cooling medium, contrary to popular opinion. I suggest you tune your A/F ratio by lambda. Lambda is not affected by the difference of stoich of either fuel. With stoich being 1.0 of course, shoot for something in the area of .85-.9 for max power, not allowing for a ratio slightly richer of the optimum figure obtained, as a safety factor, as one would for gasoline alone. For reference, .85 lambda for gas would be equivelant to 12.5 A/F. For instance, one would tune for max power, and run slightly richer of that. For a .25 A/F cushion, if so desired (and recommended) lambda would be appr. .17 lower, or a new range from .833-.883.