Moderators: IMOC Moderators, IMOC Committee Members
My front wings are FG but one does not sit 14mm higher than the other. 
What else can it be?- Circuit Pack 
You'd be surprised how far off bodywork can be without it being obviously noticable. Particularly aftermarket fibreglass parts. Measure to a point that's structurally fixed and relevant to the suspension. I'd suggest the inboard end of the track control arms. It's not as convenient as measuring the arches but it's a hell of a lot less meaningless. Ideally this should be a poured concrete surface which has been wet enough to be allowed to settle under gravity and then measured to be flat and level. A driveway or car park that 'looks right' isn't really good enough. Done properly it'll compensate for any variation in the chassis anyway. Corner weighting is the equivalent of adjusting one leg of a table so that it doesn't wobble. The absolute lengths of the table legs is less important than having the weight correctly distributed over them. If you've fitted suspension with adjustable ride height then it's really essential to get this done.kaiowas wrote:For a start, measure your ride height properly.
Secondly make sure you're taking measurements on a proper flat and level surface.
Finally, forget about the measured ride heights and have it corner weighted instead.
We conceded that the datums we were using were not good enough. The MK2 fronts do not fit either. 
From memory the SW20 one measured from the the control arm at the chassis end. As Kaiowas says though, any fixed point on the chassis is fine to measure from. Bodywork is not!