Major Vibration Issues
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Joined: Jul 2005
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From: B'ville, New York
Major Vibration Issues Mike @ New Era had to take the car off the dyno the car started vibrating so bad. I can't figure out what is wrong with my Z28, once 65mph hits the car is vibrating really bad. Since and I think before I started modding the car I had a little vib but now the car is out of control. I have replaced every thing the rearend (bearings, gears, wheel bearings) and balanced the tires. Every component has been checked to see if they are loose are tight. I'm at a total loss on what to do. They couldn't even finish tuning the car, mike had to take it on the street and tune it. I have no idea what is wrong. This absolutely ******* sucks..... 
On The Tree
Joined: Feb 2005
Posts: 120
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From: Cleveland, Ohio
Originally Posted by Mike2000Z28
Mike @ New Era had to take the car off the dyno the car started vibrating so bad. I can't figure out what is wrong with my Z28, once 65mph hits the car is vibrating really bad. Since and I think before I started modding the car I had a little vib but now the car is out of control. I have replaced every thing the rearend (bearings, gears, wheel bearings) and balanced the tires. Every component has been checked to see if they are loose are tight. I'm at a total loss on what to do. They couldn't even finish tuning the car, mike had to take it on the street and tune it. I have no idea what is wrong. This absolutely ******* sucks.....
It has a brand new NHRA approved aluminum driveshaft as well . He has replaced the axles , tires and wheels are good he has tried different wheel/tire combos and it didn't fix it , the pinion angle is at -2 degrees with a fixed edelbrock torque arm . The car has billstein shocks all the way around and I believe it is lowered 1.25 inches , it also has some umi suspension products in the back including lower control arm relocation brackets and nonadjustable panhard rod . Hoping for someone to chime in here , I drive cars every day with similar mods done and even no mods done , and have never seen a car vibrate like this and not know what the hell is doing it . I had to pull it off the dyno because it was vibrating so bad .
The only thing I can think of at this point is frame damage ???? As this car has now been doing this for nearly a year now . From what Mike tells me , it always vibrated a little bit at that speed but over the past year it has gotten much worse , I would really like for maybe some other guys that have had issues to maybe throw something out here that had an experience like this to help him fix this issue , even though I know he has posted this a few times before .
The only thing I can think of at this point is frame damage ???? As this car has now been doing this for nearly a year now . From what Mike tells me , it always vibrated a little bit at that speed but over the past year it has gotten much worse , I would really like for maybe some other guys that have had issues to maybe throw something out here that had an experience like this to help him fix this issue , even though I know he has posted this a few times before .
Teching In
Joined: Oct 2004
Posts: 32
Likes: 0
Im a tire tech soto say. This may sound stupid but if it has aftermarket wheels some times they dont have clearance around lugnut on backside(recessed area) for the rotor clips put on from factory. this can cause vibration.
Check lug for centering issues.
Have the tires/wheels ROADFORCE balanced
Just because wheel/tire 0's on Dynamic spin balance dosent meen the tire wont vibrate. due to low and high spots in the tire and or wheel.
Check lug for centering issues.
Have the tires/wheels ROADFORCE balanced
Just because wheel/tire 0's on Dynamic spin balance dosent meen the tire wont vibrate. due to low and high spots in the tire and or wheel.
On The Tree
Joined: Feb 2005
Posts: 120
Likes: 0
From: Cleveland, Ohio
Originally Posted by New Era Performance
It has a brand new NHRA approved aluminum driveshaft as well . He has replaced the axles , tires and wheels are good he has tried different wheel/tire combos and it didn't fix it , the pinion angle is at -2 degrees with a fixed edelbrock torque arm . The car has billstein shocks all the way around and I believe it is lowered 1.25 inches , it also has some umi suspension products in the back including lower control arm relocation brackets and nonadjustable panhard rod . Hoping for someone to chime in here , I drive cars every day with similar mods done and even no mods done , and have never seen a car vibrate like this and not know what the hell is doing it . I had to pull it off the dyno because it was vibrating so bad .
The only thing I can think of at this point is frame damage ???? As this car has now been doing this for nearly a year now . From what Mike tells me , it always vibrated a little bit at that speed but over the past year it has gotten much worse , I would really like for maybe some other guys that have had issues to maybe throw something out here that had an experience like this to help him fix this issue , even though I know he has posted this a few times before .
The only thing I can think of at this point is frame damage ???? As this car has now been doing this for nearly a year now . From what Mike tells me , it always vibrated a little bit at that speed but over the past year it has gotten much worse , I would really like for maybe some other guys that have had issues to maybe throw something out here that had an experience like this to help him fix this issue , even though I know he has posted this a few times before .
Hope this helps.
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Joined: Jul 2005
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From: B'ville, New York
My driveshaft doesn't show signs on the input shaft that it is moving around, but I definitely have to take a harder look at it. I'm at a totally loss to what to do about the bad vibes.
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Joined: Feb 2005
Posts: 120
Likes: 0
From: Cleveland, Ohio
Originally Posted by Mike2000Z28
My driveshaft doesn't show signs on the input shaft that it is moving around, but I definitely have to take a harder look at it. I'm at a totally loss to what to do about the bad vibes.
Originally Posted by brifri
Im a tire tech soto say. This may sound stupid but if it has aftermarket wheels some times they dont have clearance around lugnut on backside(recessed area) for the rotor clips put on from factory. this can cause vibration.
Check lug for centering issues.
Have the tires/wheels ROADFORCE balanced
Just because wheel/tire 0's on Dynamic spin balance dosent meen the tire wont vibrate. due to low and high spots in the tire and or wheel.
Check lug for centering issues.
Have the tires/wheels ROADFORCE balanced
Just because wheel/tire 0's on Dynamic spin balance dosent meen the tire wont vibrate. due to low and high spots in the tire and or wheel.
There has been 3 different wheel tire combos tried on the car to see if it went away , so it is not the wheels or tires , the rear rotors are not warped , when you hit the brakes the car smoothly comes to a stop . The only thing that hasn't been checked or replaced is the trans output shaft , or the motor mounts , not sure the motor mounts would cause the rear of the car to shake though . Keep me posted Mike .
Staging Lane
Joined: Jan 2006
Posts: 79
Likes: 0
From: Southern Indiana
have you guys seen this thread in the handling section?
https://ls1tech.com/forums/suspension-brakes/436736-vibration-highway-come-inside.html
i am considering motor mounts myself i have checked/replaced everything else!
https://ls1tech.com/forums/suspension-brakes/436736-vibration-highway-come-inside.html
i am considering motor mounts myself i have checked/replaced everything else!
