Thanks for that will give it a watch.
That's why I put pro in inverted quotes. The work that goes into Schirmer (when revealed), although the price is astronomical or simplicity of Raeder (they are the same dudes as Manthey) is sometimes genuinely jaw dropping, simple, yet precise.
I have just rough spring rates plucked all over the net in my spreadsheet. I might keep these as variables. I initially didn't see much point since they're stripped and I don't know if any lightening went on with the arms/knuckles nor know the weight of the disc let alone the entire car (the AP part numbers are in the PDF below if you feel like hunting). Would be difficult to figure out the frequency and irrelevant really as I will never run such tyre that offers this grip nor the aero. The front/rear wheel rate ratios are good to compare across a range (IIRC 3 main springs for homologation). But then, setup is up to the team, if they use the softest/stiffest front/rear or vice versa, we won't know.
E92:
https://www.bmwusa.com/content/dam/b...rsion_09_2.pdf
You can probably find these on real-oem too.
26.5mm front ARB
Main spring options (helper: 60-60-2):
140-60-160
140-60-180
140-60-200
22.5mm rear ARB
Rear C/O (use the known damper motion ratio, 0.83 IIRC with 80-50-20 helper):
160-50-130
160-50-150
160-50-170
F82:
ARB 30.4mm with triple adjustment
080-005 Helper (no idea what that is, 80mm long & 5nm/mm?)
140-60-180
140-60-200
140-60-220
Not surprised with these spring selection. Stripped weight would be as low as the E9x. The swivel bearing (aka knuckle) is practically the same sans some kingpin inclination improvement. Car is structurally stiffer and looks like new rules allowed some more aero performance. Not sure of tyre advancements either.
F82 rear C/O
ARB 26.5mm with triple adjustment
080-005 Helper
170-60-150
170-60-170
170-60-190
Despite rear C/O, I noticed (via realoem, and that is not 100% always correct) the lower camber arm is still the OEM part. Maybe homologation rule, no idea. Motorsport24/Schirmer are known to build their own lower link with their rear C/O.
However, the rear end is completely rose jointed, no rubber anywhere as you would expect. The rear F8x trailing arm (wishbone by internal references) stands out as do the axial mount on the toe arm, trailing arm (wishbone) which are standard on the road-going version as well.
Also no idea what the rear damper motion ratio is of the F8x.