Throttle body FAIL!
#25
Broken throttle shafts are quite common. Stock or modified engine, brace or no brace, N/A or F/I.. no discrimination. The only common denominator is frequent use at 7000rpm.
MX-5 Miata Forum - Throttle shaft breakage
MX-5 Miata Forum - Throttle shaft breakage
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#31
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edit: Just found his email. $350-400 for a one-off, plus $75 core charge. 3-day turnaround. The shop is British Car Service in Tuscon, AZ, and the guy's name is Ryal Greenwood.
#32
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micropolish the hole and threads on the shaft to stress relieve them. if it's a recurrent 7k rpm abuse that causes the failure, it's vibration-induced fatigue probably from a manufacturing defect, not a material defect. just remove the stress risers and it'll be much better.
#33
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That brace doesn't do ****. I put 200,000 miles on my miata without it, never a problem, and I had also milled down that rod through the butterfly. I've put another 200,000 combined on 3 other Miatas I've owned with that brace removed and never any problem.
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