Join Date: Jun 2006
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The front wheels are linked together through the rack and track rods, whether the engine is on or off ain't gonna make any difference, unless there is wear on some part. If there is wear on any part of the suspension/steering, laser, or any other alignment equipment isn't going to give any useful info as halting the car with or without the brakes, rolling forward or backward, prior to the measurement are all going to give inconsistent readings.Tracking is done on the wheel rims and is therefore independent of any flexing in the tyres.
To clarify the above assertion that tracking is done on the wheel rims, well that depends on what tracking equipment is being used!
The "laser" stuff sits on the sidewall of the tyre.
The "optical" (Dunlop) type sits on the wheel rim.
There is a system that measures the physical force acting on the road surface through the tyre.
You drive over the plates and aim for a zero deviation of the gauge.
I have used the latter for over 20 years.
There may be other systems too.
Currently in freddybabe's garage:
Hymer Motorhome and MgF.