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Old 09-24-2011, 02:49 AM   #1
kuleinc
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Default Weird rear toe, what's most likely bent?

I bought my m3 ti with considerable front left suspension damage and both left wheels were bent. I fixed front suspension, front alignment is great, checked rear (non adjustable of course), and found my right rear toe was zero and my left rear toe was almost 5mm toed out! I inspected the control arm bushings, they didn't seem to have any play, and were just starting to gef cracks. I do think my rear subframe bushings are done, can these cause the rear toe to change? I was not sure. If the subframe bushings don't affect toe, then something is bent, nothing jumped out at me, so are the arms or subframe more likely to be bent? I don't want to waste money changing subframe bushings on a suspect subframe...

Any advice from someone else that's been through this would be great...
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Old 09-25-2011, 12:15 AM   #2
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I'd guess the trailing arm.
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Old 09-25-2011, 06:23 AM   #3
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Any other votes?
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Old 09-25-2011, 10:00 PM   #4
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Whether they look good or not, the bushings are likely shot and worn in. Even brand new, parts wont always put it in spec let alone, equal out on both sides and give you a 0 thrust angle. You need to install toe and camber kits to place the rear where it needs to be per your alignment specs, whether custom and lowered or to OE. Theres no real way around it.
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Old 09-26-2011, 03:37 AM   #5
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Like the Ireland engineering kit? Or is there something better?
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Old 09-26-2011, 03:42 AM   #6
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as a certified alignment tech, theyre all the same, just pricing differences. It all depends on your install. You can weld in the camber and toe plates to accomodate for being lowered, to gain more positive camber and get toe to a feasibile spec. Or if its a dd and youre trying to save tire life, compromising handling, you can adjust accordingly.
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Old 09-26-2011, 03:54 PM   #7
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It is my daily, and it just about finished ruining a setup of Z1 Star Specs, as the shop that did the alignment after I repaired the front end, failed to mention there were SERIOUS rear alignment problems. The car does see Infineon every couple of months, so it does go to the track, the alignment specs aren't hard to figure out, just hard to acheive with no adjustment possible. I only asked about the weld in kits, as we installed a IE kit on another more stock LOW TI and he came back and the rear alignment had shifted, so either the kit is bad OR my mechanic didn't tighten the bolts and or the customer bumper something?

I'm also trying to figure out some better spring setup. I have CUT (I know WTF? right) front stock M3 springs and 4 cyl Ti H&R Race rear springs. I'm thinking about doing front H&R Race springs and some stock rear M-tech springs from a 4 cyl car? I can't/won't put coil overs on, as my commute is 70 miles round trip 5 days a week and they won't last. Any spring combo suggestions? I have adjustable Koni Sport shocks on all four corners...
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Old 09-26-2011, 04:16 PM   #8
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There is a good thread in the bimmerforums track section discussing why the eccentric tabs/bushings won't stay put. Basically once adjusted, the eccentric bushings fight each other because they are no longer coaxial.

They also believe that once the spring coil binds it creates a fulcrum that places more stress on the rtabs which causes the alignment to move. They are specifically talking about SpecE30 cars which use H&R race springs. As most of us know, H&R race drop the car way too far with too little spring rate to compensate. This lets the springs coil bind fairly easily.

Supposedly, Ireland Engineering is designing a new weld in kit that addresses these issues.

http://forums.bimmerforums.com/forum....php?t=1683367
http://www.e30tech.com/forum/showthread.php?t=107867
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Old 09-26-2011, 04:23 PM   #9
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is there a better spring with a higher rate?
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Old 09-26-2011, 04:27 PM   #10
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Coilovers, you can have any spring rate you want.
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Old 09-26-2011, 04:56 PM   #11
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Can't do that. It doesn't look like anything came of the spec E30 guy and hsi rear alignment moving issues...
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Old 09-26-2011, 05:02 PM   #12
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Turner says these dont fit 318ti's, I bet they do. Has anyone tried them? In addition to my rear alignment problem, I also have a cut spring and 4 cylinder car spring problem...

Seems like these might help the rear not bottom out, which seems is what the problem is with the Weld in IE adjusters?
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Old 09-26-2011, 06:53 PM   #13
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^^^^Not sure what you are referring to at Turner...

I bought used TC Kline rear springs and ran them without the adjusters (just stacked spring pads) and that let me pick my ride height and spring rate. Felt way better than the H&R sports.
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Old 09-29-2011, 03:54 AM   #14
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I was referring to these:

http://www.turnermotorsport.com/p-37...pring-set.aspx

Anyone tried em yet?
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