Air Fuel mixture readings??

[Kim291]

I just installed an air fuel mixture gauge on my vee. I am not sure what is considered a good reading. I used to have an EGT guage and I know what that reading should be, but not sure what the Air fuel guage should be.

What is considered lean and what is considered to rich.

Any suggestions?

Thanks
Kim Madrid
FV 29

[Dean Curtis]

Kim I've run an air/fuel mixture gauge for a while now. You should be looking for 12.9. 12.4 will be too rich and much slower. Mid 13's my be too lean. Have fun

[Hardingfv32]

You should do a little research on Google to learn about the nuances of the wide band readings. Must be wide band.... $200 plus.

If you run with alcohol the readings will be a little different. If you use Lambda readings then the fuel type is not relevant.

For best results the system showed be calibrated on a dyno in the exact manner in which you plan to use it.

Brian

[Diamond Level Motorsports]

12.4-12.6 With race fuel on the dyno showed the best power.

[Hardingfv32]

"One interesting tidbit I'll add: I have 3 LM1 tuners from innovate, and if I take the same cables and the same O2 sensor and calibrate it on each LM1 unit, all 3 will have different readings, in a range of about .7 AFR from lowest to highest. I bought all 3 new, and all 3 have the same internal settings. 2 of them have been sent in for repairs, sent back with the exact same (different from each other) calibrations. be wary of your gauge readings, even if the sensors are new. What it comes down to is that they are great for comparison, but not great for perfect data. Use other sensors such as EGT, plus spark plug color, dyno results, and common sense to make the most of your tune. Data you gain from any one sensor will never be the inherent truth."

Brian