Originally Posted by SRT6 Gang Member
I believe you will notice the acceptable lean condition, where you’re a/f leans out around 5400 rpm in 3rd (max boost). Example: At WOT a/f will be 11.8, by the end of 3rd a/f will be leaner around 12.8. Those are my numbers but you should see a similar curve.
Just speaking for my car, like I said my A/F is 11,9 at redline in 4th and 5th. I have no "acceptable lean" condition. For most accurate A/F reading I recommend an "exhaust temperature corrected" wideband right after the engine. According to my tuner the values can differ up to 20-25%...