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Message: <blockquote data-quote="The Tank" data-source="post: 109628" data-attributes="member: 3040"><p>Big J is correct on the detonation but it was only at WOT. I have to run 93 in my truck that is tuned for 87. I can't say for certain and I'm not going to bash JDM because I knew the risk of doing a mail order tune but one of the problems I had was a CEL for rear O2s and now the CEL is gone. AFR at WOT is in the 12s I just can't remember off the top of my head where in the 12s it was but I want to say it was 12.0. These hypercraptic pistons that Ford uses are fairly strong piece so I don't think I've made ugly babies in the cylinder.</p></blockquote><p></p>