Quote Originally Posted by farmtruc View Post
IMO it's not a big deal if it's too rich. When the a/f ratio is too rich, the truck will bog and not feel strong.
Even a 10.5 or 10.2 a/f ratio (at least on my truck and avalanche) still feels pretty decent.
If the a/f ratio is in the 9.0 area, the truck just don't run, so it's obvious that there is an issue, so detonation isn't a concern for me when running rich.
I've never had detonation occur when a vehicle runs too rich, cause 10.5 still isn't too rich, just my opinion.

I've heard others say this, that a rich condition will cause KR, but I haven't experienced it, but I'd like to hear about it.
Same here, I've had mine in the 9ish area (not by choice) and the engine started to bog down a little but no detonation or KR on the data logs. I keep my AFR around 10.8 on meth running hi boost and it pulls HARD. According to chemistry, running too rich shouldn't cause detonation but I really don't have a way to "MythBust" this.