[ClayMan]

This is on an E93 with ~40000 km (25000 mi) that has Eibach Pro Kit springs and GC street camber plates since 17000 km (10000 mi). The alignment I went with zero'd out the static toe in front:

FRONT
Camber: -2.4/-2.5 deg
Caster: +6.9/+7.0 deg
Toe: 0

REAR:
Camber: -1.6/-1.6 deg
Toe: 0.08/0.08 deg toe-in (0.16 deg toe-in total)

On my E36 and other BMWs, this actually leads to pretty even tire wear. On the E93 though, the inner edges on the front tires are getting demolished - is this caused by soft / worn bushings in the front leading to a lot of dynamic toe-out? Which bushings should I check first that are the likely culprit?

[e90pilot]

It's not your bushings. It's the camber. You have quite a bit. Same thing happens in my car and I have M3 control and tension arms and I have the same settings in the front.

What he said...that's a lot of camber for a street car.

[ClayMan]

When I say "inner edges", I literally mean extreme wear on just the inner shoulder blocks. It's almost smooth compared to 8/32" left on the rest of the tire. Camber wear would be more of a gradual wear on the entire inner half..

My E36 with -3.2deg and 0 toe doesn't have this problem, that's why I'm convinced there's something else wrong. Or too soft.

[subieworx]

It's not the camber, it's the toe. E36's and 46's like 0 toe in the front, but not E9x's. You have to run a bit of toe in per side to keep the tire wear even. I used to run -3.2* on my 335 with a total of .10* toe in front and had no tire wear issues.

[mlifxs]

Originally Posted by e90pilot

It's not your bushings. It's the camber. You have quite a bit. Same thing happens in my car and I have M3 control and tension arms and I have the same settings in the front.

Hi, when you say you have settings in front, do you mean both camber and toe or just toe or....?

My front camber is at -1.0 and I'm sitting on un-installed Dinan camber plates, trying decide if there will be abnormal wear going -1.7 camber up front.

[HP Autosport]

Toe has more affect on tire wear. If you have -2+ on camber and zero toe, you will eat up the inside of the tire edges very quickly. Put some toe on the car and the wear will be much slower.

[DallasBoosted]

Originally Posted by HP Autowerks

Toe has more affect on tire wear. If you have -2+ on camber and zero toe, you will eat up the inside of the tire edges very quickly. Put some toe on the car and the wear will be much slower.

I have 3.3 degrees negative camber and 1/8" total toe and not seeing any significant inner tire wear.

[tres]

whats your front tire size?

Originally Posted by DallasBoosted

I have 3.3 degrees negative camber and 1/8" total toe and not seeing any significant inner tire wear.

Originally Posted by HP Autowerks

Toe has more affect on tire wear. If you have -2+ on camber and zero toe, you will eat up the inside of the tire edges very quickly. Put some toe on the car and the wear will be much slower.

Interesting. Does it have to do with bushing deflection? How about the rear?

It would be great to get a good alignment thread going on here...haven't really been able to find a solid thread on suggested numbers.

[DallasBoosted]

Originally Posted by tres

whats your front tire size?

245-40-18 front PSS street tires.

[HP Autosport]

Originally Posted by FCobra94

Interesting. Does it have to do with bushing deflection? How about the rear?

It would be great to get a good alignment thread going on here...haven't really been able to find a solid thread on suggested numbers.

Dynamic camber has everything to do with bushing deflection. With non-M arms you will need more toe-in.

[tres]

thanks im planning on running 255 35 18 with -2 degrees camber up front

Originally Posted by DallasBoosted

245-40-18 front PSS street tires.

[The HACK]

Originally Posted by ClayMan

This is on an E93 with ~40000 km (25000 mi) that has Eibach Pro Kit springs and GC street camber plates since 17000 km (10000 mi). The alignment I went with zero'd out the static toe in front:

FRONT
Camber: -2.4/-2.5 deg
Caster: +6.9/+7.0 deg
Toe: 0

REAR:
Camber: -1.6/-1.6 deg
Toe: 0.08/0.08 deg toe-in (0.16 deg toe-in total)

On my E36 and other BMWs, this actually leads to pretty even tire wear. On the E93 though, the inner edges on the front tires are getting demolished - is this caused by soft / worn bushings in the front leading to a lot of dynamic toe-out? Which bushings should I check first that are the likely culprit?

Let me guess. Still on Run-Flats?

[DallasBoosted]

Originally Posted by tres

thanks im planning on running 255 35 18 with -2 degrees camber up front

Should be fine. 275/40-17's fit on the front with my setup.

[tres]

thanks for the info

Originally Posted by DallasBoosted

Should be fine. 275/40-17's fit on the front with my setup.

[e90pilot]

Doesn't it also have to to with the way you drive? If you just drive on the freeway with that kind of camber you'd really be riding on the inner edge. If you're cornering more or only use that alignment for tracking you'll be using more of your tire.

[subieworx]

Think of it this way. Running lots of negative camber is the equivalent of walking down the street with your feet tipped in. Eventually this will wear out the inside of your shoes. Toe is the equivalent of dragging your feet sideways while walking. Your shoes will wear out much faster dragging them across the ground than simply walking.

[subieworx]

Hp auto. Please explain your dynamic camber cement in relation to amount of camber adjusted.

[HP Autosport]

Originally Posted by subieworx

Hp auto. Please explain your dynamic camber cement in relation to amount of camber adjusted.

Static camber is what you see on the alignment rack and dynamic camber is when the vehicle is exposed to loads while going forward or making a turn or just simply driving.

[subieworx]

I see my phone screwed up my question. I was interested in your explanation of bushing deflection change with camber change.

I'm definitely quite familiar with static vs dynamic camber. I'm not seeing how dynamic camber has everything to do with bushing deflection as you mention. On a macpherson strut car roll stiffness definitely plays a much larger roll in static vs dynamic camber than bushing deflection ever will. At least assuming bushings that are not infinitely soft.

[HP Autosport]

Originally Posted by subieworx

I see my phone screwed up my question. I was interested in your explanation of bushing deflection change with camber change.

I'm definitely quite familiar with static vs dynamic camber. I'm not seeing how dynamic camber has everything to do with bushing deflection as you mention. On a macpherson strut car roll stiffness definitely plays a much larger roll in static vs dynamic camber than bushing deflection ever will. At least assuming bushings that are not infinitely soft.

The front wishbone has deflection of at least 1/8-1/4", that in itself can caust a lost of 0.5 to 1 of camber.