It's not the best recommendation, but you could push until you either hear a little pinging on hard acceleration or you don't feel any more power difference. On the dyno, the lack of power gain would be more readily apparent. As for the pinging, the knock sensor should pull timing out at the first sign of it but you should still hear a couple ticks before the PCM reacts. If you've hit this point, back off at least 1 degree, if not 2, and call it good. Remember, if you get poor quality fuel you may get pinging on a tune that would otherwise run fine.
Take care.
__________________
Bill Cohron - The Mad Doctor  
Power Hungry Performance - The ORIGINAL in Ford performance tuning... Since 1997!
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