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Vibration coasing and goes away accelerating

NA (1989-1997) NA Miata discussion within. The MX5's first generation, the NA, sold over 400,000 units from 1989 to 1997.

Vibration coasing and goes away accelerating

Old 06-17-2013, 08:15 AM
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Join Date: Jun 2013
Location: MA
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Default Vibration coasing and goes away accelerating

So I got recently a 92 Miata and it has a vibration that does increase with speed, enough to be very noticeable. Going along coasting and giving a little gas it will do it but if I accelerate or punch it the vibration is gone instantly.

Any ideas,thoughts?

- Runs great 58k Miles
- Not a spec of rust on it

It has the 14" alloys that came on it orig.

My plan is in the very very near future is to put on:
Roto Gris and Tires
Tein Coilovers (slammed)
BossFrog Clearview Single Hoop

At some point
Frog Ribs
Frog Rails
Carbon Fiber Hood and Trunk
Ford 5.0
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Old 06-17-2013, 11:40 AM
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Join Date: Jul 2011
Location: Canton, MI
Posts: 2,601

These cars are notorious for having a shimmy, so that's probably what your noticing. But picking up the brace that goes from seat belt tower to tower helps a bit or roll bar, and also a good spin balance for the tires and wheels.
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Old 06-19-2013, 01:46 PM
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Join Date: Jul 2011
Location: Tampa, FL; Lake Jackson (Atlanta), GA
Posts: 1,901

If you plan on slamming the car the sway bars and frog parts will be a waste of money. If there is no suspension travel because you are down on the bumpstops then the rest is wasted cash. Spend it on ISC Racing tophats to gain some travel if you do insist on slamming it.
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Old 06-28-2013, 09:07 AM
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Join Date: Dec 2011
Location: Oakville, Ct
Posts: 60

It is your car to do what you like to, but I don't understand the mixed use of the car....slam it and go 10 mph, but you want a 5.0 under the hood.
If you are going to REALLY do the v-8 swap, do that before you drop it to the weeds. You might find you like fast with good handling over looks. Just my $.02 to throw away.
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