Recently purchased a 2013 Grand Sport, 14,000 miles. Had a vibration throught the steering wheel at about 70 to 95 mph. Car still had original tires on it so I thought that was probably the problem. Put new Continentals on all 4, 4 wheel alignment and front end inspection. Shop said all good. Nothing has changed. Same vibration, same speeds. Any suggestions on what to check now? Thanks!

 

Congratulations on landing a 013 Grand Sport and Welcome to the forums. If you are sure the vibrations are coming from the front, and you have done the obvious, I think that leaves the brake rotors it's about the only thing left. If you decide to change rotors you might consider maybe Drilled and slotted rotors with ceramic carbon fiber type pads if you'r going to the trouble. Do you feel a pulsing in the brake pedal when Braking? If you do that is rotor runnout that can cause vibration also. I would try and then go from there. That's my opinion.

 

I have not tried the brake pedal to see if it pulsates but I will certainly try that. I get no pulsating at low speeds. Gonna try road force balance tomorrow but it seems to me that because it had no change with new tires and balancing (static) it is most likely not tires 😐

 

Rotating tires or replacing tires will change tire viberations as a general rule. High speed viberations can be related to drive line also, U-Joints, Drive line rubber bushings going bad or lose drive line bolts. That vibration can travel to the front steering. Normally drive line vibrations can be felt in the seats and floor pans and through the engine and transmission mounts. If you haven't brake pulsing at 50 mph and above they are probably fine, you would notice. One thing You can try, If you have the ability to do so would be to place the rear of car on jack stands, preferably under the rear suspension to keep the rear axels straight. (I would use 2 sets of jack stands) 2 under the body. Remove the rear tires and bolt the rotors to the axle hub with lug nuts with washers or old style lug nuts that you can reverse and tighten the rotor with 3 to 5 lug nuts. Run the cat at 75 to 95 mph to see if the vibration can be duplicated. Thats a good test for drive line vibrations.

 

Retorqed wheels and had them spin balanced. All appears good now! Thanks all!

 

Welcome to the forum. Good to see that you solved the problem.

 

Yeh, that was going to be my suggestion, check the torque on the lug nuts. Most shops just tighten with their air guns and don't bother to torque the wheel lugs. Congrats on the "13" GS, I have one as well and enjoy every minute I get to drove it.