Car Vibration - 50MPH+ - ZR-1 Net Registry Forums

msuhanek · 11-16-2016

My 1991 ZR1 has developed a vibration that appears to be coming from underneath, feeling it from my seat and through the steering wheel that is also vibrating a bit when it hits 50mph and over. Tires and balance are new. I will be taking in next week but wanted to get some feedback first on possible issues to look at.

Thanks for your help in advance.

billschroeder5842 · 11-16-2016

As you mention, your tires and balancing are new... did this situation happen after the new tires? If so, your wheels are out of balance.

You also need to check your U Joints. If they have issues, you will vibrate like hell.

msuhanek · 11-16-2016

Thanks, should have mentioned car vibrated b4 new tires and road force balance which leads to ujoints possibly but car only has 61k miles.

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Racinfan83 · 11-17-2016

If you find it let me know... Mine has 20k miles and I also have a vibration over say 55-60. Well documented in the forum. I have tried 2 sets wheels and tires, balances, rf balance, had the trans out to replace pilot bushing and inspected u-joints then, they were fine. Added C-beam plates when putting it back together so that is even more solid. So I still haven't figured it out... One thing I have not been able to do yet is to get with the FBI guys up north and try a completely different set of known good tires/wheels. One of these days hopefully I get time to do that...

Paul Workman · 11-17-2016

Quote:

Originally Posted by Racinfan83

If you find it let me know... Mine has 20k miles and I also have a vibration over say 55-60. Well documented in the forum. I have tried 2 sets wheels and tires, balances, rf balance, had the trans out to replace pilot bushing and inspected u-joints then, they were fine. Added C-beam plates when putting it back together so that is even more solid. So I still haven't figured it out... One thing I have not been able to do yet is to get with the FBI guys up north and try a completely different set of known good tires/wheels. One of these days hopefully I get time to do that...

BTDT...I think. I was getting a vibration - more like a "BUZZ" at speed. Did NOT go away when I shoved in the clutch, which lead me to thinking "drive shaft". So, I had a driveline shop install new SPICER U joints and balance the drive shaft. That CURED my "buzzing".

BTW, I have a set of stock wheels you can use for your testing. Lemmeknow if you want to borrow them.

Racinfan83 · 11-17-2016

Mine is a definite shake. Totally feels like out of balance tires. Both sets I have have been balanced and rebalanced. Gonna have to bring it up there some day and try one of your guys sets and see if that fixes it or if I have another issue. My joints on driveshaft were tight as can be when I had it out...

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We Gone · 11-17-2016

This may be way out there, but do you get the fly wheel rattle at shut down? I have seen the DM fly wheel go bad.

Quote:

Originally Posted by Pete

Most Z's have a rattle at start up till oil pressure, No worries.
At shut down it's flywheel, all stock Z's have dual mass flywheels most will have a bit of a rattle at shut down or springs in flywheel could be getting a little weak they are over 20 years old, again no biggie,when you do a clutch change deal with it then.

Pete

Racinfan83 · 11-17-2016

Nope.

Paul Workman · 11-18-2016

Just going through the checklist:

Half-shaft U-joints
Wheel bearing(s)
Suspension bushings
...
...
...

tonywy · 11-20-2016

I had the same issue, drove me nuts. Tried everything, tires , balancing, a known good set of wheels from my 86. I even changed the steering rack. Sitting in the garage staring at the car wondering whats up I pulled the right front shock off. It would only travel about two inches and stop. Low miles car no damage on shock. Changed shock and problem fixed. Just when you going you saw it all. Good luck.

11-16-2016	#1
msuhanek Join Date: Nov 2016 Location: Atlanta GA Posts: 13	Car Vibration - 50MPH+ My 1991 ZR1 has developed a vibration that appears to be coming from underneath, feeling it from my seat and through the steering wheel that is also vibrating a bit when it hits 50mph and over. Tires and balance are new. I will be taking in next week but wanted to get some feedback first on possible issues to look at. Thanks for your help in advance.

11-16-2016	#2
billschroeder5842 Join Date: Nov 2016 Location: Southlake, TX Posts: 584	Re: Car Vibration - 50MPH+ As you mention, your tires and balancing are new... did this situation happen after the new tires? If so, your wheels are out of balance. You also need to check your U Joints. If they have issues, you will vibrate like hell. __________________ Bill Schroeder Texas Proud! 1991 Corvette ZR1 #1388 2015 Challenger Scat Pack Shaker

11-16-2016	#3
msuhanek Join Date: Nov 2016 Location: Atlanta GA Posts: 13	Re: Car Vibration - 50MPH+ Thanks, should have mentioned car vibrated b4 new tires and road force balance which leads to ujoints possibly but car only has 61k miles. Sent from my iPhone using ZR-1 Net Registry

11-17-2016	#4
Racinfan83 Join Date: Apr 2013 Location: Eastern Missouri Posts: 773	Re: Car Vibration - 50MPH+ If you find it let me know... Mine has 20k miles and I also have a vibration over say 55-60. Well documented in the forum. I have tried 2 sets wheels and tires, balances, rf balance, had the trans out to replace pilot bushing and inspected u-joints then, they were fine. Added C-beam plates when putting it back together so that is even more solid. So I still haven't figured it out... One thing I have not been able to do yet is to get with the FBI guys up north and try a completely different set of known good tires/wheels. One of these days hopefully I get time to do that... __________________ [LEFT][SIGPIC][/SIGPIC][/LEFT] [CENTER][COLOR=Indigo][SIZE=4][I][B] Now Sold 1990 ZR-1 #2093, Black on Black..[/B][/I][/SIZE][/COLOR][/CENTER]

11-17-2016	#6
Racinfan83 Join Date: Apr 2013 Location: Eastern Missouri Posts: 773	Re: Car Vibration - 50MPH+ Mine is a definite shake. Totally feels like out of balance tires. Both sets I have have been balanced and rebalanced. Gonna have to bring it up there some day and try one of your guys sets and see if that fixes it or if I have another issue. My joints on driveshaft were tight as can be when I had it out... Sent from my LG-H830 using ZR-1 Net Registry mobile app __________________ [LEFT][SIGPIC][/SIGPIC][/LEFT] [CENTER][COLOR=Indigo][SIZE=4][I][B] Now Sold 1990 ZR-1 #2093, Black on Black..[/B][/I][/SIZE][/COLOR][/CENTER]

11-17-2016	#8
Racinfan83 Join Date: Apr 2013 Location: Eastern Missouri Posts: 773	Re: Car Vibration - 50MPH+ Nope. __________________ [LEFT][SIGPIC][/SIGPIC][/LEFT] [CENTER][COLOR=Indigo][SIZE=4][I][B] Now Sold 1990 ZR-1 #2093, Black on Black..[/B][/I][/SIZE][/COLOR][/CENTER]

11-18-2016	#9
Paul Workman Join Date: Nov 2007 Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri Posts: 6,493	Re: Car Vibration - 50MPH+ Just going through the checklist: Half-shaft U-joints Wheel bearing(s) Suspension bushings ... ... ... __________________ Good carz, good food, good friendz = the best of timez! 90 #1202 "FBI" top end ported & relieved Cam timing by "Pete the Greek" Sans secondaries Chip & dyno tuning by Haibeck Automotive SW headers, X-pipe, MF muffs Former Secretary, ZR-1 Net Registry

11-20-2016	#10
tonywy Join Date: Feb 2014 Location: Pennsylnania Posts: 18	Re: Car Vibration - 50MPH+ I had the same issue, drove me nuts. Tried everything, tires , balancing, a known good set of wheels from my 86. I even changed the steering rack. Sitting in the garage staring at the car wondering whats up I pulled the right front shock off. It would only travel about two inches and stop. Low miles car no damage on shock. Changed shock and problem fixed. Just when you going you saw it all. Good luck.