Inside Tyre Wear

[brasiliangringo]

Thanks for the upload but i find it makes no sense tbh. I cant see why bolt 2 needs to be touched for toe adjustment and find Audi's workshop procedure (as is sometimes the case) for something simple very convoluted, but perhaps i am completely missing something!

[ainarssems]

You do TOE adjustment the usual way with track rod ends, after that you do constant S adjustment using bolt 2 to make sure TOE changes as it should when suspension goes up and down, then recheck normal TOE. If it's not done correctly TOE will be correct when car is stationary but could be wrong when car is loaded or when going over bumps and suspension travels up and down.

I can put up full adjustment procedure later.

[ainarssems]

I made a quick picture to show the idea. I have of course exaggerated the angles to better show the idea.



Top picture shows the correct way, middle if the bolt 2 is tightened too little and bottom if it is tightened too much. In either of these cases you can adjust TOE to specifications while car is stationary and unloaded but when driving and suspension travels up and down it will change incorrectly.

[brasiliangringo]

Thanks for the drawing as it certainly helped explain something i had no idea about. As said, have no hands on alignment experience so this was useful + just re-read in ELSAWIN what you posted up.

[ainarssems]

There is nothing wrong with you not knowing. The problem is that many garages and technicians that change track rods and perform wheel alignment are not aware of this. They fully tighten bolt 2 when changing track rod end so you end up like bottom picture and then set TOE without adjusting constant S. So your TOE is correct when stationary and unloaded but changes by greater value then normal when loaded or when suspension is compressed over bumps and you end up with too much TOE-out in those conditions which result in inside edge tyre wear.