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larry is correct. you can't just tune for say 11.3:1 and call it a day otherwise the autotune feature in the ems would be worth a damn. timing is way more important than afr and it is more difficult to get correct as well. for a street tuned 4g63 by a novice tuner, the most I would shoot for would be 11:1 even with zero knock and that's with zero ignition advance because I'm cautious when it comes to tuning. basically, when I tune, it's for a safe conservative afr with zero knock and then I play with timing slowly and gradually. furthermore, timing will help spool more than afr as a rule of thumb.
leaning it out in the lower range to promote spool is rather silly too becuase it's very bad for the turbo (similar to antilag ports in the manifold) and you simply can't change the characteristics of the turbo with an overly agressive tune. if the turbo runs out of efficiency above 25 psi, then running race fuel and clamping the wastegate line just isn't the same thing as running a proper turbo. thus, the hard parts dictate your tuning to a large extent.
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