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Originally Posted by eng92
Says who?
Depending on VE, you can generally get more hp from timing than you will from a lean afr.
In certain rpm ranges, I can get close to 5 degrees more timing at 12.5 than at 13.5.
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In my dyno experience I've noticed that
my A33B gets very picky whenever there are large fluctuations re: AFR. Also, I've seen, again only in
my dynos where my car makes more power whenever it is closest to 14:1. This could be because of the indirect affect of AFR conditioning via MAF V alterations.
I’ve tuned anywhere from 12.5 – 14.0. And 14.0 seems to be the favored area for power production. But again in my case, whenever I go leaner, my timing gets bumped ever so slightly.
So in the end, forget what I said and do what makes most power for your particular set-up.