Ainar raised this issue about the Constant S alignment when I posted about wheel alignment after a track rod end replacement. I talked to the indy garage and it appears that it wasnt done. I did some further research
The explanation of why its required:
Bump or rebound alters the toe-in as a function of the bump and rebound travel. The resultant toe values are referred to as the toe-in curve.
The change in toe constant "S" is set with the vehicle raised by way of vertical adjustment of the track rod end. The wheel alignment computer determines the toe constant "S" by way of one measured value in the initial position and one when raised. In doing so, the actual values are compared to the specifications and displayed on the monitor.
Different adapters are required for raising depending on running gear .
Incorrect adjustment of the toe constant will result in inaccurate steering on braking/accelerating or driving over an uneven surface.
Elsa web shows how it is done:
http://elsaweb.spaghetticoder.org/do...F-F/20839457/2
The attached file is an alignment procedure for VAG vehicles. It mentions different vehicles so I am not sure how specific it is. It states the conditions after which alignment AND S-point adjustment is required. (i.e. replacement of specific components and, of course uneven tyre wear!)
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2002 D2 S8 – Ming Blue, Valcona leather, Vavona wood insert, solar sunroof (to be fitted), Heated rear seats, extended leather pack, 18” Avus, ski hatch, Bose, auto dim rear view mirror, rear blind.
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