#10467, "Need Help understanding A/F mixture, and what is acceptible"
I had it in my mind that 11:1 was a leaner mixture than 12:1 on the A/F ratio. I was just told on another board that when I'm running from 12.5 down to 11.5 I am running richer. Is this true?
Also, what is the acceptible range to run your A/F ratio on the 4G63. What is my target A/F ratio to have?
#10468, "RE: Need Help understanding A/F mixture, and what is acceptible" In response to Reply # 0 Jun-23-04 06:13 AM by Mattcky2k
I belive 14;7 is the perfect mixture, and as the number increases (16.2, 17.6, 19.4)that is a lean reading, and as the number decreases (14.3, 13.8, 13.2)that is a rich reading. And of course at idle the reading will/should be constantly changing and under WOT a good reading would be 13;0 or richer. Anything below that might be to lean.
1997 Mitsubishi Eclipse GSX: K&N Filter, John Sheppard built transmission with GVR4 1st gear, autometer boost gauge, "free mods", Greddy type-s BOV, broken shifter
#10471, "RE: Need Help understanding A/F mixture, and what is acceptible" In response to Reply # 3
I dont' think there is an "optimal" air fuel, simply because i'm pretty sure it differs by compression (in NA cars). I think 14.7 is correct for like 8:1 compression, though. NOt sure how to do it with a turbo, if compression matters, boost, or whatnot
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Black 98 GST missing her owner and looking for a new one...Inquiries welcome
#10472, "RE: Need Help understanding A/F mixture, and what is acceptible" In response to Reply # 4
If you don't have a wideband o2 sensor, don't tune with the Air Fuel ratio. The stock sensor is not nearly accurate enough to be used to properly tune the car.
1st gens should have the o2s around .92, and 2Gs should be slightly higher at around .96. (conservatively tuned). But again, tune using timing advance and knock.
