What is this noise at high RPM?

Miata Parts, Intakes, Superchargers, Headers, Exhausts, Shocks, Springs, Sway Bars, Brake Kits, Autocross and track mods.
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Joined: Mon Jan 09, 2012 1:32 pm
Location: San Diego

What is this noise at high RPM?

Post by Curves »


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
Posts: 128
Joined: Mon Nov 15, 2010 12:02 am

Re: What is this noise at high RPM?

Post by morrisg »

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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