I started with factory street settings on 19" wheels/tyres
Tried track settings on the street and it was a bit firm so backed off the fronts towards street settings and rears, one notch down for B&R settings.
Switched to 18" wheels on MPSS 245&265/40/18 then had the car fettled by Center Gravity (CG) - see thread in the link below
https://f87.bimmerpost.com/forums/sh....php?t=1633253
Post fettling by CG, my car's damper settings (18" 245/265 MPSS tyres @ 31psi cold)
Front axle
Rebound 11 clicks open
Compression 7 clicks open
Rear axle
Rebound 8 clicks open
Compression 6 clicks open
Dampers set harder in the rear than the front for 2 reasons:-
1. When assessing compression/suspension travel with all dampers set too full soft, Chris @ CG was amazed at how firm MPC front springs were. Hence, less bump dialed in as springs don't need as much support due to their stiffness. Conversely, less rebound to balance between enough weight transfer, limited body movement and optimising compliance to ensure tyre contact patch consistency.
2. The concept of bumpstops being secondary spring effectively means that they prohibit spring travel/damper stroke which, when c/w ride height, maybe sub-optimal when expecting suspension to remain effective at managing tyre contact patch/compliance. This was the case with my car, in the rear it showed evidence of bumpstop contact. With dampers set too full soft, rear MPC spring rates are less than the front. Therefore, rear needs more support from the dampers ie higher bump setting and more rebound to re-settle springs quicker.
For trackdays, if need be, increase rebound stiffness in 2 click increments F&R and gauge how the car feels.
Works very well.
BP