What is this noise at high RPM?

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What is this noise at high RPM?

Postby Curves » Tue Jul 14, 2015 9:00 pm

https://www.youtube.com/watch?v=87lzUz6SCjo

This only happens during Autocross accelerating at high RPM. I cannot make it happen on the street. It gets progressively worse during the run. So heat related?

After 0:39 in the video to the finish listen whenever I accelerate at high RPM. Also listen to it when I stop for my time slip and drive into pre-grid.

2012 Miata Velocity Red SE, Ohlin DFV, 9kg/6kg, RPF1 17x9, RE-71R 245/40, PPE, Street Single, Moto-East Tune
Curves
 
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Re: What is this noise at high RPM?

Postby morrisg » Wed Jul 15, 2015 11:24 pm

Sounds like a vibration of metal on metal. My guess is your exhaust has shifted and its the mid-pipe vibrating against the body underneath the car. Check the hangars, too, they have been known to vibrate off the straight exhaust pegs (no mushroom retainer).
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