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I think you need a rear spoiler, the trunk is way way low and short on the Miata. Apparently the lexan duckbill/"whale tail" that is pretty popular raises the pressure over the rear enough to add a huge amount of grip on the track.
I unfortunately crashed my MR2 so now I'm thinking about an old Miata. One idea I came up with is to retard the intake cam a bit; do you know if that's easy to do? I heard about people tweaking timing by moving around the cam position sensor (I've only worked with VVT cars so this is hilarious to me), I figured the cams themselves might be easy to get to as well.
I would guess that the cams have too much overlap at low load since there's no VVT. A bonus of that mod would be that maximum hp might increase (and the Miata could definitely use some of that...).
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