So forgive me for intruding here but I'm curious about the best AFR for direct injection. I've lurked and found several examples of what appear to be very lean afrs on dyno plots. I drive a direct injected mazdaspeed6 and everyone in mazdaland is trying to hit 11.5:1 or thereabouts with a couple of outliers tuning to 12.5:1. Can anyone speak with authority about the optimum afr for DI? Shiv?
Examples:
http://www.e90post.com/forums/showthread.php?t=29708
http://www.e90post.com/forums/showthread.php?t=105342
http://www.e90post.com/forums/showthread.php?t=105080
http://www.e90post.com/forums/showthread.php?t=104489
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