Ground Control Camber Plates and Camber Angle

[Flying Low]

I've done a total of 7 track days with the M4 (and 3 more with the turbo E46 M3). After initially getting the wrong spherical bearings on the GC plates; now with the correct Teflon bearings, the GC camber plates have been great with no noise at all in front after 2 track days and about 2000 miles on California's really lousy roads. Time and miles will tell how long they will last without noise but I can highly recommend the GC plates now. The M4 has Hoosier 285 and 295 front and rear. Two of the 7 track days on the M4 were done without camber plates and the front tires had a fair amount of wear on the outside edges. The next 5 track days on the M4 were with GC camber plates set at about 3 degrees negative and 3/32 inch toe out. The front Hoosiers are corded on the inside edges and are toast. I'm going to reduce to 2 degrees and see how that is. Also, I might reduce the toe out.

Has anyone else experienced cording on the inside edges of the front tires? And what is the sweet spot for front camber. It appears that TC Kline camber plates only go to 2 degrees negative and maybe this is the sweet spot. I did notice less braking capability with the 3 degrees as compared to no camber plates in front (stock camber).

Thanks,
Terry

[MasterP]

Toe out will kill tires for sure.

Really odd to see inner wear on a track setup. I run over 3 degrees negative camber and the outside still wears faster than inside.

[notoriousjje]

What suspension do you have? Do you have a lot of body roll?

Your toe is marginal. It will accelerate wear, but Chording the inside edges is weird. Hoosiers like a lot of camber too.

[Flying Low]

Adaptive suspension and OEM springs. I'll measure the front toe again. With the camber plates set for the street, I'm at about 3/32 inch toe in.

[larryn]

Stock springs, you can compress quite a bit. With -3.0deg camber up front, on compression will be considerably more. I run -3.0 on my E92 M3, and coilovers, and my track tires (NT01) wear fairly evenly. I am at zero toe.

The only other thing I can suggest is that you might be running too high tire pressure, which would also eat the inside edges.

[Jaymax85]

What noises were u hearing

[Flying Low]

No noises at all and I was running 35PSI hot. I'll try to get the alignment checked soon to see where exactly I am.

[M3 Number 86]

Originally Posted by larryn

Stock springs, you can compress quite a bit. With -3.0deg camber up front, on compression will be considerably more. I run -3.0 on my E92 M3, and coilovers, and my track tires (NT01) wear fairly evenly. I am at zero toe.

The only other thing I can suggest is that you might be running too high tire pressure, which would also eat the inside edges.

more camber on compression in a macpherson strut?

[CanAutM3]

Originally Posted by M3 Number 86

more camber on compression in a macpherson strut?

Yes, possible. It all depends on the suspension geometry and how it was designed.

[rwalker]

Originally Posted by jawwadh

What noises were u hearing

with the wrong spherical bearings, the front clunks severely over high-frequency bumps

the wrongness is that those spheres were machined too small, so they moved around in their sockets

[larryn]

Originally Posted by M3 Number 86

more camber on compression in a macpherson strut?

Yes, definitely. Just as when you lower the car, there is more camber induced.