Something is wrong Car Alignment

[Nuked]

I just went out and measured mine since we have similar setups.

27.5" both sides. They were pretty much even, if anything within 1/8" or less difference.
From top of tire to body panel was 1/2" on both sides. I just eyeballed it with the tape measure and didn't use a straight edge, so not precise but close enough to give an idea.

BMR SP080 springs, BMR lockout kit, -1.8 camber both sides on rear.

When I did my install I went a side at a time. Dropped both subframe bolts out, removed shock to install Steeda bushing, pushed down on subframe/control arm to remove stock spring, installed BMR spring and cradle kit and shock, then tightened up. I had zero issues with alignment on either side, so I was lucky. Threaded in the bolts by hand then tightened. Did not do any bushing clocking.

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[CEHollier]

Thanks nuked. Yes we both should have approximate rear drops. Tires will affect overall distance top fender well to ground. What really made no sense was rear height increasing. I liked the stance before these guys touched it.

 

[CEHollier]

Spec sheet for the job. Any constructive input is appreciated.

 

[BmacIL]

Nowhere near enough rear camber. Possibly from the clocking error. Should be around -1.5 and symmetric. That could be a good chunk of your L/R inconsistency for sure. Rear toe is on the lower end of what you want, but ok. It'll probably increase a tad when the bushings get sorted back out. Front camber looks good, but I'd like to see that front toe be more symmetrical and positive rather than negative if it's not 0.00 each side.

 

[Roadway 5.0]

Front camber and rear toe look great. Front toe is a touch out, my preference is a touch in (.06 to .12 each wheel). Credit to your shop for getting nearly flat zeros on rear camber, though having some is preferred on a daily driver.

In the end, I don’t see anything on this sheet that would cause uneven ride height in the rear.

 

[BMR Tech]

Tweaking the alignment should do the trick.


Set it up like this, and enjoy:

 

[BmacIL]

Also that nearly positive camber would have a significant impact on tire to well measurement, as well as the 0.6 deg difference between the two giving a L/R offset difference.

 

[CEHollier]

So the shop that did the work wants to charge me $100 to re-index the bushings. Rambles on about my suspension not being stock. He cannot account for how the ride height increase after I showed him no camber change in front and ride height increased 1/8 inch. Also the front had already been re-indexed. He could not explain this discrepancy. I'm bringing it to another shop. A big thank you to Steeda Tech and Jamie Bell with Steeda. Also a shout out to Brian BmacIL. The information and guidance all of you gave me to figure this out was extremely helpful.

 

[Volstang]

I just replaced the stock Pirelli PZeros on my '15 and my fronts had too much camber and it wore the inside of the tires. I had an alignment after I installed my BMR 81/88 springs back in Jan '17. After getting a fresh set of Firestone Indy 500s earlier this week, I took the car in for an alignment and was informed that I had too much camber and there wasn't enough adjustment to get it right. The guy showed me how much camber it had and you could see the wheels leaning in good bit. He had to elongate some holes, I believe it was the ones that connect the strut to the spindle, to obtain enough adjustment. Wheels are what they need to be now though. He also noticed that my passenger side height is 1/8" higher than my driver side. Not sure if that is normal variance in the springs or what. The springs are properly seated and everything looks right. I'm not too worried about that amount of difference. Just glad my camber is correct so I don't wear out my tires prematurely.

 

[BmacIL]

I just replaced the stock Pirelli PZeros on my '15 and my fronts had too much camber and it wore the inside of the tires. I had an alignment after I installed my BMR 81/88 springs back in Jan '17. After getting a fresh set of Firestone Indy 500s earlier this week, I took the car in for an alignment and was informed that I had too much camber and there wasn't enough adjustment to get it right. The guy showed me how much camber it had and you could see the wheels leaning in good bit. He had to elongate some holes, I believe it was the ones that connect the strut to the spindle, to obtain enough adjustment. Wheels are what they need to be now though. He also noticed that my passenger side height is 1/8" higher than my driver side. Not sure if that is normal variance in the springs or what. The springs are properly seated and everything looks right. I'm not too worried about that amount of difference. Just glad my camber is correct so I don't wear out my tires prematurely.

FYI unless you have a lot of camber (more than -2.5, for instance), it's not going to have a huge contribution on wear. Some, yes, but toe is what causes uneven wear much more than camber, especially on non-driven wheels. If you have -1.6 to -2 front camber and zero toe, it'll be much less inside wear than -1.0 and 0.3 deg of toe.

 

[Volstang]

My toe was out a bit but nothing crazy. My camber was out quite a bit. Everything is good now though!

 

[NightmareMoon]

FYI unless you have a lot of camber (more than -2.5, for instance), it's not going to have a huge contribution on wear. Some, yes, but toe is what causes uneven wear much more than camber, especially on non-driven wheels. If you have -1.6 to -2 front camber and zero toe, it'll be much less inside wear than -1.0 and 0.3 deg of toe.

Well a bunch of people (myself included) with less than 2.5 degrees of camber do see tires cording on the inside edge before they get to the wear bars in the middle of the tire. Its a common thing on these cars. IDK if tire pressure is a contributing factor. For me this, this happened at 20k miles on frequently rotated MPSS tires with ~2.3' camber front, 0 front toe, and ~1.7 camber rear with 0.15 toe in per side. The conventional wisdom doesn't seem to account for the results a bunch of us are getting.

So naturally, now I'm running more camber and more toe

 

[BmacIL]

Well a bunch of people (myself included) with less than 2.5 degrees of camber do see tires cording on the inside edge before they get to the wear bars in the middle of the tire. Its a common thing on these cars. IDK if tire pressure is a contributing factor. For me this, this happened at 20k miles on frequently rotated MPSS tires with ~2.3' camber front, 0 front toe, and ~1.7 camber rear with 0.15 toe in per side. The conventional wisdom doesn't seem to account for the results a bunch of us are getting.

So naturally, now I'm running more camber and more toe

Yeah but not only street driven right? Hard braking on track will chew up inside shoulders too with lots of camber, particularly if you're at stock height and don't have the anti-dive that some lowering gets you.

Mine is at -1.9 front and I'm getting flat wear, or at least close enough that I can't accurately measure any taper with a depth gauge.

 

[NightmareMoon]

Yeah but not only street driven right? Hard braking on track will chew up inside shoulders too with lots of camber, particularly if you're at stock height and don't have the anti-dive that some lowering gets you.

Mine is at -1.9 front and I'm getting flat wear, or at least close enough that I can't accurately measure any taper with a depth gauge.

Nope, those tires were 100% street driven. That set of MPSS didn't see one single day at an autox or track.

Wear across the surface looked even and flat... except for the very inside shoulder edge, which was cord.

It happens, and I've seen a handful of posts from other bewildered owners who only drive on the street with the exact same inside wear issue. Almost seems ... normal? I need to bump my standard pressures from 31-32 to 33 and see if it helps at all on this set of MP4S.

 

[CEHollier]

Everything was lined out by AMR automotive in Baton Rouge. My stance is back, tires are in the fenders, and ride is much better. BmacIL your alignment specs were very helpful. After they reindexed the bushings it dropped 2-3/16 inch. Adding negative camber tucked the tires. I thank all for their input. I'm a little wiser when it comes to suspensions now.

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