[Ausmurry]

Well I definitely pushed the limits, I recently did M3 control arms on my 2017 340i rwd, and then got some et30 18x9 ARC-8 with 255/40r18s. I am very much so rubbing the fenders mainly from the forward caster of the arms.

I was hoping with some camber/caster plates I could correct the caster and adjust camber to get stuff to not rub, I am having trouble finding a caster/camber plate that will allow me to pull my caster back, does anyone have any suggestions? Attached are some pics.

[TurboWeasel]

How does the F80 get around that problem? Different knuckles?

[Dom147]

Originally Posted by TurboWeasel

How does the F80 get around that problem? Different knuckles?

wider fenders.

[Dom147]

Originally Posted by Ausmurry

Well I definitely pushed the limits, I recently did M3 control arms on my 2017 340i rwd, and then got some et30 18x9 ARC-8 with 255/40r18s. I am very much so rubbing the fenders mainly from the forward caster of the arms.

I was hoping with some camber/caster plates I could correct the caster and adjust camber to get stuff to not rub, I am having trouble finding a caster/camber plate that will allow me to pull my caster back, does anyone have any suggestions? Attached are some pics.

I unfortunately met the same fate when doing the m3/m4 control arm retrofit on my f22. I had millway street camber plates and was on a 18x9 ET42 wheel with a 12mm spacer. It took all of what the camber plate would give me in order to tuck it in behind the fender (the m control arms add about 10mm of "poke" by pushing out the entire suspension) which ended up being about -4 degrees of camber. This still didnt fix the issue of the caster which I thought would have been corrected by purchasing the m thrust arms too. I guess not. I ended up switching back to the stock arms and it fixed all my problems.

In summary, I wouldn't use camber plates to correct the issue since, the already added camber from the m control arms and the future camber for the plates will be a lot. Adjustable caster bushings could potentially resolve your forward rubbing issue but not the poke issue.

[TurboWeasel]

Originally Posted by Dom147

wider fenders.

I meant pushing the wheel forwards, not the wheel poke. Or does the M3 have different shape fenders? F30 and F80 have identical wheelbase according to wikipedia, so I'm guessing not.

[Dom147]

Originally Posted by TurboWeasel

I meant pushing the wheel forwards, not the wheel poke. Or does the M3 have different shape fenders? F30 and F80 have identical wheelbase according to wikipedia, so I'm guessing not.

The M cars do indeed have different shaped fenders and fender liners. Wheelbase is just the distance between the front and rear axles of a vehicle, so both can be simultaneously true.

I wonder if OP had also done the thrust arms. Like I said in my previous post, they didn't fix the castor issue for me but perhaps it would for him as others have reported? For added value, my caster before the M LCA's and thrust arms was 7.2 L and 7.5 R. After the M upgrade it was 8.4 L and 8.6 R.

[casualDIYer]

When I had an F22 I swapped both front arms to fix both camber, then castor issues. I do recall needing a spacer though to fit the thrust arm properly to the mount point on the subframe. There is a ton of info on this for this platform and the f22. Keep searching. You’ll find someone else whose done the same thing.

[Dom147]

^

I recall doing the same thing. Here is the thread that I used going into very great depth on how to go about it.

https://www.2addicts.com/forums/show....php?t=1079766

[alohasurftoad]

Although I'm unaware of the reason OP chose to use M-arms.

If it was for the monoball bushings, I'd swap out the M3 arms to standard F3/4 series arms with monoballs, such as VAC, Millway, Dinan, Turner, etc. and get Millway or other quality camber plates if extra negative camber was desired

[TurboWeasel]

Originally Posted by Dom147

The M cars do indeed have different shaped fenders and fender liners. Wheelbase is just the distance between the front and rear axles of a vehicle, so both can be simultaneously true.

I wonder if OP had also done the thrust arms. Like I said in my previous post, they didn't fix the castor issue for me but perhaps it would for him as others have reported? For added value, my caster before the M LCA's and thrust arms was 7.2 L and 7.5 R. After the M upgrade it was 8.4 L and 8.6 R.

Yup. Distance between front and rear hub centres, no? So if the F80's front wheels are more forward than the F30's as stock, surely that increases the wheelbase? That's why I asked if the F80's knuckles are different because they can move the caster back by altering the control arm ball joint position.

If not that, perhaps it's all in the F80's subframe?

By fender shape I meant is the wheel arch arc moved forward to compensate for the wheel being further forward?

Interesting stuff. I'm keen on this mod but not keen on how the front wheels sit in the arches afterwards. There must be a way re centre the wheel again using stock F80 parts?

[casualDIYer]

Originally Posted by alohasurftoad

Although I'm unaware of the reason OP chose to use M-arms.

If it was for the monoball bushings, I'd swap out the M3 arms to standard F3/4 series arms with monoballs, such as VAC, Millway, Dinan, Turner, etc. and get Millway or other quality camber plates if extra negative camber was desired

I’m on K-Mac’s front camber bushings for f30 xDrive. The plus, up to 2 degrees of camber with little to no noticeable loss in comfort with regards to noise and vibration. Cons: 2 degrees of camber. That’s it. Think of it like an M sport upgrade rather than M performance. The instructions lack details regarding the placement of the lock washer. It’s krickey up the digerydoo = a wee bit crappy mate