I wish to subscribe to your newsletter. How bad is bad?

I'm sure others will have more to add to this, but very bad. It's damn near equal to running lean. Conventional wisdom is: more fuel, less knock, and that is generally true to a point (though it is a rather sloppy way to tune). Past this point, you get into a region of "rich preignition" where the extra fuel can actually exacerbate the knock problem instead of stave it off.

And this doesn't even take into account cylinder wash, MPG loss, and fouling. Generally speaking, there really isn't much of a reason to ever go richer than 11.0; and I would say even 11.0 is considered an AFR for more "extreme" setups.

Sparknotes: 10.0 under boost can do the same damage 14.0 can.

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Damn KraftWerks Digital Fuel Controller/Super/Power/Voodoo/band-aid card goes 10:1 on my AEM UEGO (this is max for this gauge btw) any time it sees over 4-5 psi. :facepalm:
I am significantly disappoint, but thank you for the edumication. Props for you

(Edit: John: Was also sorry to read about the accident but glad you and the wife made it out OK, and thanks for letting us vultures pick at the carcass. I await the updated part out thread with baited breath, I'm trying not to buy your ARTech and 2560)

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A lot of AFR gauges don't display beyond 10.0 so if you see 10.0 on the gauge in actuality you could be even more rich. Just something to consider. 10.0 is actually roughly the upper limit as far as when knock begins again. I've known some guys to run 10-10.5 safely, and some to start to experience knock at high RPMs at that level, while bad, it's doesn't seem to come on abrupt and catastrophic like lean knock can.

Thanks for the kind words, I got a weekend off the flight schedule so expect that updated thread soon. Both your items are still available. *evil grin.

/likewise ended threadjack.