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NoDOHC · 09-09-2009, 08:27 PM

Rotary and piston are really the same here. They both use the same fuel and the same ignition source.

Unfortunately, the AFR you should run depends on how much boost you are running and what your dynamic compression ratio is. It also depends on your ignition timing.

If I tune a boosted car, I aim for 12.7:1 - 13.0:1. But I never like to go more than 7 psi on a 8-8.5:1 compression ratio car. If you have 8.5:1 + carbon build up + excessive boost (>10 psi) then you should run much richer (I have seen guys run as rich as 10:1AFR at 25 psi).

As I said before, if you run conservative timing, you can run a little leaner. If you run rich, you can get away with a little more advanced timing.

Please don't take offense, but if you have to ask this question, maybe you should get someone to help you tune your car and save the expense of a rebuild.

09-09-2009, 08:27 PM	#2
NoDOHC The quest for more torque Join Date: Sep 2008 Location: Sheboygan, Wisconsin Posts: 855 Rep Power: 17	Rotary and piston are really the same here. They both use the same fuel and the same ignition source. Unfortunately, the AFR you should run depends on how much boost you are running and what your dynamic compression ratio is. It also depends on your ignition timing. If I tune a boosted car, I aim for 12.7:1 - 13.0:1. But I never like to go more than 7 psi on a 8-8.5:1 compression ratio car. If you have 8.5:1 + carbon build up + excessive boost (>10 psi) then you should run much richer (I have seen guys run as rich as 10:1AFR at 25 psi). As I said before, if you run conservative timing, you can run a little leaner. If you run rich, you can get away with a little more advanced timing. Please don't take offense, but if you have to ask this question, maybe you should get someone to help you tune your car and save the expense of a rebuild. __________________ 1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers) 1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)