Track day: WTF is happening to my dash?

JamesCH

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2009 Mazdaspeed3; 1991 Turbo Miata
At an Auto-X this weekend a very peculiar thing started happening to my Miata: if I launched hard (4-5k rpm) my dash fuse would blow near the 1-2 shift. If I launched under 4k it would be fine. No shorting out under extreme braking or lateral acceleration. It's probably a short somewhere, but where? Has this happened to anyone else?
 

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