I get a vibration in the car at 71 mph* and am trying to identify which whe el is unbalanced. Reasoning that the vibes would be greatest directly over the wheel in question, I downloaded a recording accelerometer app onto two smartphones and put them (i) in the boot over the wheels and went for a sp in down the local dual carriageway then (ii) put them in the footwells and did the same. I can easily see the vibrations at 16 Hz on the spectrum plots, the problem is that the levels are extremely similar above all four wheels and none of them stand out as being worse than the others.
So how can I pin it down to one wheel. I don't want to attach anything belo w the suspension springs. Or could it be that all 4 wheels are a bit unbal anced.
rusty
- the indicated 71 mph is legal as the speedo reads about 4 mph fast.