^^ My car does the same thing. I've fluctuated as much as 3mph at the track with very similar DA conditions. A 3mph difference in the same car is EASILY felt. And I'm not a slow shifter at all. Although I don't own a Z, we share in the same frustration.
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'06 Accord 6spd Coupe
Bolt ons/3.84s/Tune
13.28 @107.56 - 2.19 60'
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