3.5 rpm vibration - Miata Turbo Forum - Boost cars, acquire cats.

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Old 04-15-2013, 11:26 PM   #1
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Default 3.5 rpm vibration

OK, I've got a vibration that comes in at 3.5k rpm, then goes away if I hit 4k rpm. it doesn't do it if i'm floored, only when cruising at 3.5k. any ideas?

I'm running 8 pounds boost on a 96 miata. I've got flyin' miata computers, and intercooler, BOV, ram style header and a turbo taken from a 89 thunderbird. the vibration is so bad that the bolts holding the turbo on continually come loose, and two headers have cracked. it's not the exhaust, it's not hitting anything.

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Old 04-15-2013, 11:27 PM   #2
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One more note- i feel it most through the pedals. and it acts the same whether i'm sitting still, or on the freeway. it's rpm based, not speed based.
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Old 04-17-2013, 06:02 PM   #3
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check your tires
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Old 04-18-2013, 04:13 PM   #4
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wait, you're running a turbo and a header?

Also, does it make this sound/vibration when you're in neutral?
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