Understanding AFR's
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Understanding AFR's
I know 14:7.1 is perfect. I am trying to learn/understand what the lower numbers or higher numbers mean. I had my car dynoed on Saturday and my AFR is way off! I guess cruising ratio is 15:5.1 to 16 and then it drops to 8.9? I just had a mail in reflash, drove the car and it didn't feel right, that's why I went to the dyno and put down a whopping 178whp and 230 torque. I talked to Al and he said send it back but it doesn't sound like the reflash. I am just a noobie lost in Kansas .
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The ratio is parts Air : parts gasoline. 14.7:1 is 14.7 parts Air to 1 part gasoline... The higher the ratio (15.5:1 for example), the LEANER the mixture, i.e. more air. A lower number means your mixture is RICH (i.e. 10:1), which is safer for the motor. How are you measuring AFR for cruising? did you get the 8.9:1 from the AF reading on the dyno? Sounds like she's rich under load.
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BLiu
Evo Engine / Turbo / Drivetrain
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Jul 27, 2004 11:55 AM