Help me fight this frieken frequency (resonance) - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 04-15-2009, 02:12 PM   #21
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Alright I have a video of what's happening.

Fooling around at idle, I held my foot as steady as I could to bring the revs up to 4000RPM, as soon as you hit it it's like the starting gun at the Kentucky Derby, the revs just take off.

Crazy Acoustics. Very interested in seeing the dyno results and what's actually happening to my torque.




I promise, I'm not moving the pedal when the revs jump. Second video showing my foot not moving in one sec. The above video is NeoGenesis2004 doing it.
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Old 04-15-2009, 02:24 PM   #22
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another video showing my foot:

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Old 04-15-2009, 02:28 PM   #23
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I'll update any changes with my setup once I'm back on the road. Weeks though...
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Old 04-15-2009, 02:56 PM   #24
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sounds like air getting into the motor or sumpn
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Old 04-15-2009, 03:00 PM   #25
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Scott have you checked the springs on the butterfly? Maybe one of them broke or is loose?
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Old 04-19-2009, 04:26 PM   #26
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moved the resonance to 4300RPM and lessened the throttle effect.

Now i can hover the RPMs where I want and the resonance simmered down.

I gotta figure out a solution that can withstand boost and see what happens on the dyno with and without

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Old 04-23-2009, 11:50 AM   #27
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i ended up defeating nearly 100% with a 4" piece of vacuum hose.
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