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Originally Posted by RS61
Yeah the alignment shop is the best of the best, recommended by literally everyone over here. Spent 20 mins on the phone with them today talking it through.
Definitely possible that something has knocked the alignment out. But we talked about how if one of the rear toes was out, it wouldn't be just during the acceleration that it would show up, you'd have a sense of it in general while driving. They said that in 95% of cases it ends up being the tyres, but there's 5% chance that something at the back is amiss, maybe a damper that behaves differently during the squat.
One thing they suggested trying is to swap the rear wheels around to see if it changes the dynamic. Would definitely confirm that it's not the tyres, and that there's nothing wrong with the actual wheels. Seems an easy test so going to give that a go.
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I had an E92 M3 that had a slight mismatch of toe in at the rear and it did drive quite oddly....especially on acceleration where the rear would tend to steer the car. It was a while ago but IIRC going from accelerating to sudden closed throttle also felt weird.
The rear suspension typically has some static toe-in if OEM.
Under acceleration the rear wheels tend to toe-out, reducing the amount of static toe-in...but maintaining enough that the car tracks in a straight line.
If the rear wheels have a different static toe-in side to side you can get rear wheel steer...especially under acceleration.
If the rear static toe-in is correct but the rear wheels toe-out a different amount under acceleration then that can also cause rear wheel steer.
If that makes sense.
Wheel swap seems a good idea to start with.