The afr you see on a dyno graph is at wot and is not the same as cruise afr.After I brought it down to 13-13.5, the noticeable pinging is gone and it 'feels' like it has more power. The engine builder told me that I need to test, but (for my motor specs) I should be running 12.5 (richest) -13.5 (the leanest). Through testing it was mostly running at 13.5-14 AFR at WOT.Driveshaft: Custom 2' shaft with larger universals and sliding spline to suit T-5. Stock 10.5' with Wilwood retracting slave cylinder mounted forward of the release arm and operated by a 7/8' Girling M/C in the stock pedal box.
You want to look at the AFR curve and make sure it is within your desired target AFR, lets use 11.2 as our target. On the right you can see the values for that moment which shows an AFR of 10.5 and 20psi.
