I have a 'canned' tune that advances timing ~ 3 degrees over stock in some tables (total of 18 degrees) at WOT. In ideal circumstances (the absence of knocking or pinging which would reduce ignition timing) I cannot increase my timing easily without purchasing some additional tuning equipment. What I can do is skew the fueling at various MAF sensor readings via a MAF translator. I can also increase boost to approximately 15psi with a smaller pulley I have on order.
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1997 Pontiac Grand Prix GTP
i/h/e, Aquamist 2c, 13psi / stock blower
13.95@102.69mph
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