Quote:
Originally Posted by 8686
I noticed that in your last run the AFR is going very rich according to the dyno like 10 on 4500 rpm. on the log, it is reading 12.17.
Can any one help in explaining why is that happing.
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Looks like his OEM wideband is not calibrated. OEM calibration only reads around that low. You have to re-write the axis on the tune to lower it and make it readable. However below ~12AFR the oem sensor is not terribly accurate and its update frequency is fairly low.
The dyno wideband is a little more reliable. However if you remove a cat on the car the dyno will start to read more accurately. So it might start to look slightly richer at the tail pipe.