Factory Michelin Tires.....???

[Volfy]

The symptoms of an unbalanced wheel/tire is usually very predictable, so it's relatively easy to diagnose. Unless the wheel/tire is grossly out of balance, you won't hear/feel it at lower speeds. Then above a certain speed, you start to hear/feel a rhythmic pulsing. The higher the speeds, the higher the frequency and amplitude. If it's on the front, it'll get bad enough that above some speed on the hwy, the steering wheel will start to shake.

Slow down the speed of your car, and the rhythmic pulsing will subside. Speed up, and the vibration will get worse again.

 

[Nightkidzero13]

What you're describing is exactly the sound I've had a few times with cars at speed with a balancing issue. In my most recent case, it was one of the rear tires even though I also felt a slight shake in the steering wheel. Road force and almost back to smooth as silk (my tires are 20k miles, so they'll never be new again).

I am hoping that's what it is because I cant find any mechanical reason why this noise would be present. I was concerned because you can feel a small shake in the steering wheel slowing down but that is also not consistent. I replaced the front brakes with R1 concepts because they were cheap and better than stock until I can put some DBA rotors on it.

 

[Nightkidzero13]

The symptoms of an unbalanced wheel/tire is usually very predictable, so it's relatively easy to diagnose. Unless the wheel/tire is grossly out of balance, you won't hear/feel it at lower speeds. Then above a certain speed, you start to hear/feel a rhythmic pulsing. The higher the speeds, the higher the frequency and amplitude. If it's on the front, it'll get bad enough that above some speed on the hwy, the steering wheel will start to shake.

Slow down the speed of your car, and the rhythmic pulsing will subside. Speed up, and the vibration will get worse again.

Yeah that makes sense but because of its inconsistent nature that was why i didnt think tires could be the culprit but I am noticing they used a large amount of weights to balance the tires out atleast on one or two wheels. That kind of leads me to think one of the wheels might have a small bend or deflection in it. The roadforce should expose or identify any of those possibilities. I can get the wheels straightened through work as we use a company to do Land Rover Rims all the time. I am also going to try running slightly less inflation in the tires because when up to operating temp they all read like 40-41. I have never owned a car that wanted pressures as high as this car does and i am wondering if it is a noise produced by the tires being what I consider over inflated

 

[Snicklefritz]

I am also going to try running slightly less inflation in the tires because when up to operating temp they all read like 40-41.

This is probably worse than you think. I've "triangulated" between the TPMS and two handheld gauges. The handheld gauges are within c. 1 lb. of each other. The TPMS thus reads 3-5 lbs. lower than the actual psi. If that is the case with your TPMS, then you are actually closer to 45 psi at running temperatures.

 

[Nightkidzero13]

This is probably worse than you think. I've "triangulated" between the TPMS and two handheld gauges. The handheld gauges are within c. 1 lb. of each other. The TPMS thus reads 3-5 lbs. lower than the actual psi. If that is the case with your TPMS, then you are actually closer to 45 psi at running temperatures.

I will make the adjustments and see if that clears anything up

 

[stoopid]

The symptoms of an unbalanced wheel/tire is usually very predictable, so it's relatively easy to diagnose. Unless the wheel/tire is grossly out of balance, you won't hear/feel it at lower speeds. Then above a certain speed, you start to hear/feel a rhythmic pulsing. The higher the speeds, the higher the frequency and amplitude. If it's on the front, it'll get bad enough that above some speed on the hwy, the steering wheel will start to shake.

Slow down the speed of your car, and the rhythmic pulsing will subside. Speed up, and the vibration will get worse again.

Yes mine was at a particularly higher speed and consistent/reproducible. But at what 'higher speed' depends, on prior cars they were at higher and lower speeds than my recent example. In the case of the lower speed example long ago, it happened at the lower speed then went away after a certain speed then returned, with about 20MPH between. That might have been because there were two tires out of balance.

As for TPM measurements, my TPM is about 1 PSI low. Which is to say - negligible. I keep my tires close to spec, having to inflate/deflate a few times a year because of the temp swings from summer to winter. I've seen low 40s PSI once or twice, usually 40 PSI is max and that's with Vegas heat. My experience with tire pressure causing drive quality issues, is that one or more of the tires have to be vastly under inflated. If they're in the ballpark of spec and within a few PSI of each other there's never a ride quality issue.

I know the temptation is to try everything one can first. But sometimes you need a tire doctor to examine. Road force will also reveal if there's any belt issue or bulges, as it will be obvious on the more precision machine. If the tires aren't bald yet, it's worth exploring this still IMHO.

 

[Nightkidzero13]

Yes mine was at a particularly higher speed and consistent/reproducible. But at what 'higher speed' depends, on prior cars they were at higher and lower speeds than my recent example. In the case of the lower speed example long ago, it happened at the lower speed then went away after a certain speed then returned, with about 20MPH between. That might have been because there were two tires out of balance.

As for TPM measurements, my TPM is about 1 PSI low. Which is to say - negligible. I keep my tires close to spec, having to inflate/deflate a few times a year because of the temp swings from summer to winter. I've seen low 40s PSI once or twice, usually 40 PSI is max and that's with Vegas heat. My experience with tire pressure causing drive quality issues, is that one or more of the tires have to be vastly under inflated. If they're in the ballpark of spec and within a few PSI of each other there's never a ride quality issue.

I know the temptation is to try everything one can first. But sometimes you need a tire doctor to examine. Road force will also reveal if there's any belt issue or bulges, as it will be obvious on the more precision machine. If the tires aren't bald yet, it's worth exploring this still IMHO.

I am def having them road forced, just a matter of getting my lazy techs to do it lol. Hopefully early next week I can get it squeezed in and see what the results are