nsxtasy said:Yes, it's usually due to the balance of the wheels/tires.
If you still have the original wheels/tires, or if you have a friend with an NSX, you can swap the wheels/tires and verify whether the vibration still occurs with the other set. If it goes away, it's definitely the wheels/tires.
NSXTech said:As was mentioned, not all balancers are the same, and more important, neither are their operators. Most machines have a +/- .3 switch, which will tell the operator "ok" if within that range. Okay for some cars, NOT any Honda procuct I have ever seen. When I bought my Hunter DSP9000 balancer, I ordered it with switch deleted. They must be balanced to 0/0
Where the weights were placed depends on how the machine was set. Most modern balancers have at least 2, if not 3 settings for plane. If set for 'dynamic' you get readings for both outer rim placements. If set for 'static' you get a single plane, single weight placement, designed for outer rim only. Mine has an addl set setting for centerline single plane, designed precisely for tape weights on alloy wheels.
And the reason it comes and goes is quite simply, harmonic imbalance. The harmonic disturbance is strongest at a specific speed. Alignment can never cause a vibration, nor can brake rotors- unless you are braking when you feel it.
However, if your wheels are NOT hubcentric, its all a waste of time. You will never gets these balanced properly.
NSXTech said:The static setting is meant to be used with single placement outer rim only. Dynamic is for both rims, outer placement. The third Hunter method is called 'Optimize' and it is a PITA to do but allows for correct center inner wheel placement of tape weights.
Hub rings work if they are a perfect fit. They fit perfect when, 1) they have no measurable play when inserted into the wheel, and 2) have no measurable play when slipped over the hub. If you have just a bit at both, then when put together you have too much. You should barely be able to move the ring when inserted or installed, in either the wheel or on the hub.