Front Uprights update

[amg6975]

Direct bolt on but the E92 M brakes won't work. You need F3x/F8x or non-M E9x brakes, yeah?

Any info on geometry changes and part numbers?

Edit: Did some digging. Part numbers are 31219500209 and 31219500210. They're $2,500 each. Geometry changes look like a little additional caster and camber. No mention of roll center anywhere.

[Track/S]

Originally Posted by amg6975

Direct bolt on but the E92 M brakes won't work. You need F3x/F8x or non-M E9x brakes, yeah?

Any info on geometry changes and part numbers?

Right, but i don't think anyone who wants to use GTS knuckles is going to want to use OEM brakes.

Part numbers:
31219500210
31219500209


I have the knuckles scanned, I am calculating to compare with the price of BMW, I think I could make them cheaper, and also make it in such a way that it can be mounted in E and F series without any modification for abs sensors and calipers.

[tsk94]

Somewhat related... I'm thinking of doing F8X front uprights on my E92. I have lots of M4 bits from my M4 track car that I want to transfer over to an E92 M3, including the full BW Alcon BBK. Was thinking about swapping on the F8X front knuckles to use the Alcons on the E92 that way. Then source the E9X rear caliper bracket, or make a custom one for the rear kit.

When people do the F8X upright swap, are they still using E92 control arms? Can you use the F8X front tension arm if you do the upright as well? Or would you still need to use an E92 specific arm? tdott Would you happen to know?

[amg6975]

Originally Posted by Track/S

Right, but i don't think anyone who wants to use GTS knuckles is going to want to use OEM brakes.

Yes probably but then anyone with a BBK already on their car will need a new adapter at the least.

[Track/S]

Originally Posted by amg6975

Yes probably but then anyone with a BBK already on their car will need a new adapter at the least.

I have BBK brackets for F series, these can be mounted on E series with some spacers.

[gmx]

Originally Posted by 911r

M4 GTS knuckles are a direct bolt on? M4 GTS arms necessary? Have you measured the change in geometry?

Bolt on, swapping nothing you can expect some more neg camber (not the correction knuckles) at a higher ride height. Again, assuming you change nothing else except the knuckle, hub.

Tension strut hole to hole is the same IIRC. The other arm will put your wheel into the fender liner.

[tdott]

Originally Posted by tsk94

When people do the F8X upright swap, are they still using E92 control arms? Can you use the F8X front tension arm if you do the upright as well? Or would you still need to use an E92 specific arm? tdott Would you happen to know?

I am still using the E9x arms with the f8x uprights.

Not sure what changes would be if using f8x tension arms.