Suspension, Brakes, Drivetrain discuss the wondrous effects of boost and your miata...
Sponsored by:
Sponsored by:

Defective kyb = vibration 60-70mph?

Thread Tools
 
Search this Thread
 
Old 05-14-2010, 04:01 PM
  #21  
AFM Crusader
iTrader: (19)
 
olderguy's Avatar
 
Join Date: Oct 2004
Location: Wayne, NJ
Posts: 4,667
Total Cats: 337
Default

Is it possible that a front and rear shock were switched?
olderguy is online now  
Old 05-14-2010, 09:50 PM
  #22  
Junior Member
Thread Starter
 
luiml73's Avatar
 
Join Date: Mar 2010
Location: Miami, FL
Posts: 76
Total Cats: 0
Default

I will work on the car tomorrow and post some pics of the F/Right coilover setup.
luiml73 is offline  
Old 05-15-2010, 03:11 AM
  #23  
Elite Member
 
jacob300zx's Avatar
 
Join Date: Jul 2007
Location: Houston, TX
Posts: 3,201
Total Cats: 145
Default

Bent shock shaft?
jacob300zx is offline  
Old 05-15-2010, 03:47 PM
  #24  
Junior Member
 
SolarYellow510's Avatar
 
Join Date: Apr 2008
Posts: 349
Total Cats: -2
Default

The shimmy went away on my '99 when I put on the Konis.

I also have a '91 with 188k miles and AFAIK original, basically non-functional shocks. Couldn't even drive it at 65-70 on the highway. Got the wheels balanced properly (no need for road force, just round wheels and tires and a proper dynamic balance) and it's rock-solid at all speeds.
SolarYellow510 is offline  
Old 05-16-2010, 06:57 PM
  #25  
Junior Member
Thread Starter
 
luiml73's Avatar
 
Join Date: Mar 2010
Location: Miami, FL
Posts: 76
Total Cats: 0
Default

Originally Posted by jacob300zx
Bent shock shaft?
I bought a new one on ebay this morning. I'll post after installed to see if it fixed problems.
luiml73 is offline  
Old 05-16-2010, 07:04 PM
  #26  
Elite Member
iTrader: (1)
 
NA6C-Guy's Avatar
 
Join Date: Feb 2008
Location: Birmingham Alabama
Posts: 7,930
Total Cats: 45
Default

Originally Posted by gospeed81
You'll probably have more luck at miata.net, since it affects almost every miata.

You need a good balance on your tires if you don't want to drive a paint shacker.
I have had my tires rebalanced like 3 times and still I have a shake at anything above 65ish. I wonder if it would have anything to do with only putting weights on the back of the wheel. I doubt it. I'm pretty sure it doesn't have anything to do with the 65mph shimmy though, since I have had it running smooth before with zero shake. So to the OP, just have the wheels balanced by someone who really takes their time to do it right, and has good equipment, and it may be OK.

Last edited by NA6C-Guy; 05-16-2010 at 11:06 PM.
NA6C-Guy is offline  
Old 05-16-2010, 10:07 PM
  #27  
Elite Member
 
jacob300zx's Avatar
 
Join Date: Jul 2007
Location: Houston, TX
Posts: 3,201
Total Cats: 145
Default

Tierod? Wheel bearing?
jacob300zx is offline  
Old 05-17-2010, 07:01 AM
  #28  
Junior Member
iTrader: (1)
 
BarbyCar's Avatar
 
Join Date: Apr 2007
Location: Toronto, Canada
Posts: 469
Total Cats: 25
Default

I just had to replace a rear brake rotor for this problem.

No pedal pulsing and multiple wheel balance attempts did not fix it. It took a trip to the dyno where I saw the driver's side rear wheel wobbling to find this.
BarbyCar is offline  
Old 05-20-2010, 01:14 PM
  #29  
Junior Member
 
Sam TII's Avatar
 
Join Date: Feb 2010
Posts: 279
Total Cats: 4
Default

Originally Posted by jacob300zx
Tierod? Wheel bearing?
+1, any howl with the vibration?
Sam TII is offline  
Old 05-20-2010, 04:35 PM
  #30  
Senior Member
iTrader: (1)
 
gesso's Avatar
 
Join Date: Mar 2010
Location: Bay Area, CA
Posts: 811
Total Cats: 270
Default

Originally Posted by luiml73
I bought a new one on ebay this morning. I'll post after installed to see if it fixed problems.
I was under the impression kyb's have lifetime warranties? I know you're not the orginal purchaser but most decent autoparts stores will help you out anyways (costs them very little, encourages you to return to them for other parts)
gesso is offline  
Old 05-20-2010, 09:44 PM
  #31  
Junior Member
Thread Starter
 
luiml73's Avatar
 
Join Date: Mar 2010
Location: Miami, FL
Posts: 76
Total Cats: 0
Default

Originally Posted by Braineack
is the sleeve taller than the shock body? They must be shortened if so. I have a feeling the body is riding on the sleeve...
I think you where right. The rear was flush, but the front sleeve was way taller(1"). It looks like the front sleeves are taller then the rears.



I raised the car about 1" on all sides, but the passenger front still sits 1/2" taller then all the other sides. Must be something wrong with that shock/shaft. Anyways the car rides much better now even though it doesn't look as nice anymore, but it will have to do untill my Vmaxx's arrive from FM.

Raised

luiml73 is offline  
Old 05-24-2010, 06:00 PM
  #32  
Newb
 
cfdrifter's Avatar
 
Join Date: Jun 2008
Location: West coast
Posts: 23
Total Cats: 0
Default

I've been chasing a vibration at 70 for months now. good luck.
cfdrifter is offline  
Old 05-24-2010, 07:57 PM
  #33  
Elite Member
 
jacob300zx's Avatar
 
Join Date: Jul 2007
Location: Houston, TX
Posts: 3,201
Total Cats: 145
Default

You need to cut those massive bump stops down. Even threads everywhere is no way to go, just raise until even for now.
jacob300zx is offline  
Old 05-24-2010, 11:06 PM
  #34  
Junior Member
 
SolarYellow510's Avatar
 
Join Date: Apr 2008
Posts: 349
Total Cats: -2
Default

Originally Posted by NA6C-Guy
I have had my tires rebalanced like 3 times and still I have a shake at anything above 65ish. I wonder if it would have anything to do with only putting weights on the back of the wheel. I doubt it.
Stop doubting it. Take your wheels off, use a good wheel cleaner like Eagle One to get all the dust off the inside, then take them to a place that uses tape weights to do a proper dynamic balance. The weight on the inside only takes out the hop, not the wobble.
SolarYellow510 is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Tony the Tiger
Miata parts for sale/trade
63
12-29-2016 02:23 AM
Jike Spingleton
Cars for sale/trade
3
09-20-2016 04:33 PM
lugee
Miata parts for sale/trade
5
03-02-2008 07:59 PM
arga
Insert BS here
3
12-08-2006 03:32 PM
slydin miata 619
Miata parts for sale/trade
10
10-25-2006 03:15 AM



Quick Reply: Defective kyb = vibration 60-70mph?



All times are GMT -4. The time now is 08:32 AM.