Increased NVH after Suspension

[Merchant Marine S550]

Recently installed CB005 and FRPP Track dampers and SP083 springs. I've also installed Nitto Invo tires. Car handles like it's on rails, but I have developed an increased vibration around 50-100mph. I can live with it, but it's not ideal. Would the springs/dampers increase vibration, or the CB005? I will be getting the tires balanced again-it's possible that I lost a weight somewhere on the road.

Is it possible that the subframe is not aligned properly when I installed the CB005?

Sponsored

 

[Burkey]

Recently installed CB005 and FRPP Track dampers and SP083 springs. I've also installed Nitto Invo tires. Car handles like it's on rails, but I have developed an increased vibration around 50-100mph. I can live with it, but it's not ideal. Would the springs/dampers increase vibration, or the CB005? I will be getting the tires balanced again-it's possible that I lost a weight somewhere on the road.

Is it possible that the subframe is not aligned properly when I installed the CB005?

Did you get an alignment after doing all of this?
Tyres can make a big difference to road noise, not sure about vibrations unless they’re out of balance?
CB005 typically makes very little (if any) perceptible change to NVH.

 

[NotMarc]

What was the last thing to change before the noise started? As @Burkey asked, did you recently get an alignment (maybe with the installation of those tires)? If so, maybe the bushings could stand to be clocked or something else revisited since they would have loosened up several things to do a 4 wheel alignment.

If they're not brand new, maybe the tires are wearing poorly (out of round/cupped or no longer balanced (lost a wheel weight)).

Just guessing.

 

[Det_Riot]

You mentioned nothing about an alignment after install. As other have mentioned, first thing I would do is get a 4 wheel alignment on the car, especially if you never did one after the springs and shocks. After that I'd look at getting the wheels rebalanced and making sure everything is tight. Were the wheels and tires on the car before the part install?

 

[EFI]

What exactly is vibrating? I could be the tires being out of balance, or it could be the suspension not being aligned and or torqued properly but the only way to tell that is to know what's vibrating

Did you clock your bushings after the install?

 

[Norm Peterson]

Where do you feel this vibration the most? Steering wheel (somewhere up front), or seat cushion (probably out back)?


Norm

 

[NightmareMoon]

Vibration, especially speed sensitive, has just got to be from the wheel/tire balance.

Suspension changes (removing rubber from the bushings, added braces, changing joint types) can cause bumps and surface irregularities to transmit to the driver, but a continuing vibration on a smooth road is going to be from the wheels & tires (or driveshaft, or engine), because that's the only stuff moving on a smooth road.

 

[BmacIL]

It can be driveshaft angle vibration. Many cases of the highway vibration issue stem from shifted subframes. I'd agree it's probably tires, and is probably just noticeable now that there's much less isolation.

 

[Merchant Marine S550]

All,

I had a 4 wheel alignment but will be going to a different shop to have another one done. The tech had a very hard time getting my preferred settings (BMR Street Handling specs), and seemed clueless about the set up.

I clocked all of the required bushings after the install.

I did everything at once (suspension and tires). Tires have less than 1000 miles on them and show no wear. I noticed the vibration throughout, it is noticeable in the floorboard and through the steering wheel. I will look for my alignment specs to upload. I know the pinion angle is at 0 degrees, which is important because when it's any different than that you can see vibrations.

Damn this car handles great though, even at only -0.5 rear camber and -1.2 front camber. Can't wait to see what a good alignment will do.

Sponsored