Weird vibration at 85 mph

[DavidKFla]

I would hope that they at least use a Hunter machine with road force balancing. Then, as you pointed out, the machine should be calibrated correctly. And it's quite important that the Smart Weight setting is turned off. Otherwise the tires won't be balanced nearly as well as they could be.

These days it's unfortunately much easier to find a store with the good Hunter equipment than one that also has a person who truly knows how to use it.

Heck, I recently got a set of tires and wheels from Tire Rack, and in normal fashion put them on the balancer since I know they use Smart Weight. This time the balancing was unusually bad. Not so much the numbers, but two of the wheels had weights 180 degrees apart, on the same plane.

On one I simply pulled the same amount off in both places, and sure enough, perfect balance.

Anyway, the amount of weights used really isn't an issue. I often end up with the wheel with the most weights having the lowest road force numbers. So much for putting the least amount of weights in the front...if the tires are correctly balanced.

I use a little tire shop up the road that have a couple racers that work there. They understand what is needed to get your tires right.

Too many times people at the big stores have no clue.

 

[AeroF16]

I’ve used Discount Tire in Phoenix and here in UT on all my vehicles. Have only ever had the one issue which wasn’t their fault, it was just a bad tire.

Not all of them are bad haha.

 

[Paladin06]

2020 hcwb....Driving above or below 85 and the vibration/pulse is gone. 85mph and you feel the vibration through the steering wheel, brake and gas pedals and the floor boards.

Tire balance?
Driveshaft?

Any thoughts appreciated. Has nitto slicks on the back and stock tires on the front.

I had the same issue on the Redeye. It turned out to be a tire balance issue.

 

[2ndAmend]

Good old flat spots.

The easy solution to flat spots is get some 1/2" thick pink foam sheet insulation and cut squares to park on.

The most common cause of vibration is bad balance.

I have to wonder if the DR's are cold and unhappy, or maybe they moved on the wheel. Did you mark the wheel and tire when you installed them?

 

[DavidKFla]

The easy solution to flat spots is get some 1/2" thick pink foam sheet insulation and cut squares to park on.

The most common cause of vibration is bad balance.

I have to wonder if the DR's are cold and unhappy, or maybe they moved on the wheel. Did you mark the wheel and tire when you installed them?

Mine definitely move. They were marked and the detail guy rubbed them off with tire shine.
They'll need to be rebalanced after this next event.

 

[16GoManGoHC2]

Harmonics

Agree here, these cars seem to have a resonance point around 85 mph, seen lots of posts on it over the years and 85 mph a repeating number in the posts, mine the same, but comes and goes, the more rubber you take out of the isolation points (cradle bushings, Diff brace, etc) the more you feel it.

 

[Jimmy N.]

Simple solution: Don't go so damn slowly.

85 is for when stuck behind someone and waiting for it to be clear to pass. I have paid for eight gears, so I want to use them all.

 

[TraxMoe]

Mine definitely move. They were marked and the detail guy rubbed them off with tire shine.
They'll need to be rebalanced after this next event.

EEEEH GOD man rubber isn't supposed to shine. What the HELL is wrong with that detail guy

 

[BULL]

EEEEH GOD man rubber isn't supposed to shine. What the HELL is wrong with that detail guy

There's a fine line between rubber actually being black, and shining...

.02

 

[ChargerChallenger]

My hood starts lifting and rippling at buck fifty should I complain?

 

[TraxMoe]

There's a fine line between rubber actually being black, and shining...

.02

You show me one tire that ever came off the production line that was shinny and then I'll agree with you . Maybe those Piss Zero tires do though LOL

 

[DavidKFla]

You show me one tire that ever came off the production line that was shinny and then I'll agree with you . Maybe those Piss Zero tires do though LOL

Don't get your panties in a bunch...


It just looks clean.

 

[Jimmy N.]

You show me one tire that ever came off the production line that was shinny and then I'll agree with you .

Some Toyos do. Recently got a set of AT IIIs and thought somebody had smeared some of that miserable tire goop on them.

 

[1971demon]

My hood starts lifting and rippling at buck fifty should I complain?

All Mustangs do that..

 

[ChargerChallenger]

All Mustangs do that..

I didn’t think Mustangs could go that fast but yeh My Charger HC all day everyday😎

 

[1971demon]

I didn’t think Mustangs could go that fast but yeh My Charger HC all day everyday😎

WTF...where's the U Tube video on the new red eye...how does it compare to yer old Charger...I'm gettin tired of watchin yer old re runs...

 

[ChargerChallenger]

WTF...where's the U Tube video on the new red eye...how does it compare to yer old Charger...I'm gettin tired of watchin yer old re runs...

 

[1971demon]

bout fuckin time

 

[ChargerChallenger]

bout fuckin time

I was hoping to grab the last run one 1000 plus Hp but I am out since Stellantis is Ass Hats at this point.

 

[Jimmy N.]

I was hoping to grab the last run one 1000 plus Hp but I am out since Stellantis is Ass Hats at this point.

I'm still hoping for the 6-door.