Thanks for the advice. I took the rear end to pieces, it was quite dirty/dusty but the the bulk head seemed to be well seated. I decided to chamfer the chassis slightly exactly as it shows in the manual just to be sure, I also removed a tiny bit of flashing on the bulkhead where the inserts sit. I cleaned it all up and put it back together and the tweak's gone
.
Is running without the motor plate brace recommended?
On my brace the thread's are stripped anyway... So may be time to get an alloy one.
I actually ran the car today, it was on a tight indoor track running foam tyres. I transferred the shocks and tyres over from my B4. The rear tyres didn't have much left and I'd been struggling for rear grip with the B4, so thought the chassis change would be an interesting comparison.
I was blown away by how well balanced the X6 was! Traction out of corners simply wasn't an issue. I went from 4 to 3 rear toe to actually get a little more steering. I also put 0.060" up from 0 for anti-squat to try and get a bit more side bite mid corner, this was the only place grip felt a little low. Compared to the B4 pace was 1-2 tenths up, but the biggest thing was taking the knife edge out of the handling, very happy
.