My car is a 2011 CTS V sedan, 53k miles with heads,cam, intake, pulleys, E85, FBO, etc. This whole ordeal started last summer when I bought a set of MT ET Street 17 inch 305/45s for the rear American Thrust rims I got with the car. On any launch of more than 1/4 throttle however it sounded and felt as if the tires were scrubbing. So I sold them and put the stock wheels and tires back on. However, the car had the same issue even with the stock wheels back on and the car also started feeling as if it was bottoming out on any kind of bump. So at the mileage and reading of shock failures at 30k, I replaced the rears on Friday hoping that was the entirety of the issue.
Well the car certainly rides better but I still have the same rapid vibration/ noise sensation on even moderate acceleration. It literally feels as if something is vibrating against the frame of the car. The harder you get into the throttle the more prominent it is. Any ideas what this could be? I've asked on FB and someone mentioned engine mounts but the issue only presents itself on acceleration. If its a factor, the car has 3 inch exhaust coming off of longtube headers and the exhaust often catches on the peak of my driveway backing the car out since my lot is a slope. I would gladly take the car to a shop to figure this out since I absolutely don't want to throw parts at the issue but there are no decent speed shops within 2 hours despite the size of the city I'm in. Anybody have any ideas?
Well the car certainly rides better but I still have the same rapid vibration/ noise sensation on even moderate acceleration. It literally feels as if something is vibrating against the frame of the car. The harder you get into the throttle the more prominent it is. Any ideas what this could be? I've asked on FB and someone mentioned engine mounts but the issue only presents itself on acceleration. If its a factor, the car has 3 inch exhaust coming off of longtube headers and the exhaust often catches on the peak of my driveway backing the car out since my lot is a slope. I would gladly take the car to a shop to figure this out since I absolutely don't want to throw parts at the issue but there are no decent speed shops within 2 hours despite the size of the city I'm in. Anybody have any ideas?