Drive Line Question - Miata Forumz - Mazda Miata Chat Forums
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NA (1989-1997) NA Miata discussion within. The MX5's first generation, the NA, sold over 400,000 units from 1989 to 1997.

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Old 01-31-2012, 08:20 PM   #1
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Default Drive Line Question

Hey guys, I was driving my Miata back from work today and noticed that there was a vibration at higher speeds. Around 55-60 MPH on the highway. The first thing I am thinking is a drive line with bad u-joints. So I climbed underneath it and grabbed the drive line. When I attempted to rotated the drive line it seemed to be be a little bit of play. Now when the car is in gear should I be able to turn the drive shaft a little bit or should there be no play in it what so ever? I am trying to remember how a bad u-joint should react when I let off the gas and then accelerate again. Now I did check all 4 wheels to make sure that everything is tight and they were. I did grab the rear half shafts and they seemed all tight too. Any help on the matter would be great.

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Old 01-31-2012, 08:23 PM   #2
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may want to give this a read the 65 shimmy, these cars are notorious for having a shimmy, mine starts at around 55 and stops around 75. http://www.miata.net/garage/65_mph.html

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Old 01-31-2012, 08:35 PM   #3
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Very interesting read. I will have to take off the locking lug nuts and get them replaced. I will also have to see if the local Les Schwab has this more precise wheel balance machine. Thanks for the heads up Red.
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Old 01-31-2012, 08:40 PM   #4
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np, its not going to fix all of the vibration but should help. there is a bit in the chassis if i remember from my reading on the subject
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Old 01-31-2012, 08:44 PM   #5
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From my understand, it seems to be a resonance frequency of the chassis. Not much you can do about it. Even with a Hunter balance machine it doesn't go away, as much techs don't have to get the force balance below 20.

I have learned to live with it, but unfortunately as you get stiffer springs, the vibration gets worse. Best thing to do is cage the car
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Old 02-01-2012, 12:15 AM   #6
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you will get used to it after a while.if you want to keep the security lug nuts. move to all of something like this http://www.summitracing.com/search/D.../?autoview=SKU
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Old 02-01-2012, 03:43 AM   #7
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Keep in mind I use the same security lugs on all 4 studs, but when I got rid of the daises a lot of vibration went away.
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Old 02-01-2012, 08:41 AM   #8
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I have the shimmy. It moved a bit with the FM Frame Rails and the roll bar towards 65. So, I drive 60 or 70 unless I want the vibration.

TL;DR Drive harder and you won't notice.
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Old 02-01-2012, 12:09 PM   #9
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Fwiw, I got my car with bossfrog rollbar, and bbs wheels. I never EVER have had this shimmy that so many have experienced. I dont know why, but my guess is the rollbar.
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Old 02-01-2012, 07:37 PM   #10
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Quote:
Originally Posted by Dntlift View Post
Fwiw, I got my car with bossfrog rollbar, and bbs wheels. I never EVER have had this shimmy that so many have experienced. I dont know why, but my guess is the rollbar.
if you get bored one day take it out and drive around, bet you get it then
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