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Street tuning the spark timing is asking for trouble. You are trying to pick out a torque regression in a sea of noise coming from wind and all sorts of other sources. You use accelerometers and do opposing direction runs, but you still have a ton of signal noise. Doing this is like trying to hear your elderly grandma from across the room at a frat party. And no, you can't just tune for detonation.
To do it right, use a dyno. To get close, but not guaranteed optimal, street tune it and hope you don't hit a semi or get a ticket.
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