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01-16-2019, 06:09 PM | #1 |
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Hello all having some alignment gremlins this week.
Had BMW try and do an alignment after doing a full M3 suspension swap including rear subframe. The main issue according to the Tech is the rear toe not being able to get within spec making the rear ended extremely squirrely. He aligned it to M3/1M specs. His best guess is the ECS trailing arms are too short. So I will be measuring them and comparing to the OEM trailing arms in a few days. Another solution would be to use adjustable toe arms from Dinan or HPA; however I'm not sure if this is just putting a bandaid on a larger underlying issue. Attached are the alignment specs. Curious what everyone thinks could be wrong.
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01-16-2019, 07:16 PM | #3 |
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Actually I measured the ride height to be pretty close to the 1Ms ride height. It's low but not slammed. Guess I'll look into adjustable toe arms.
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01-16-2019, 07:24 PM | #4 | |
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I like it just the way it is! PS - those red numbers, though. lol
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Yeineken1300.50 |
01-16-2019, 08:03 PM | #5 |
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That is a LOT of toe out in the rear. I would think it would be barely drivable. If you reduce the rear camber, it would be closer. Basically, what you want is to set the toe adjusters to maximum, then turn down the rear camber until the toe comes into spec. Basically backwards to doing a normal alignment. You won't have much camber, but at least it will be driveable. Your rear tires will be done in no time as it sits.
Then go find some shorter arms. |
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01-17-2019, 09:16 AM | #8 |
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Did you also swap rear knuckles?
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01-17-2019, 10:44 AM | #9 | |
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I did not change the rear knuckles. From my research that isn't necessary. But I may be wrong. https://www.1addicts.com/forums/show...=748574&page=4 Now that I've had some more time to think about it I really suspect that the rear is just too low for the OEM arms and I need something adjustable as others have stated.
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01-17-2019, 01:15 PM | #10 |
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You replaced #17 & #13 with the M control arms right>? I think you will need to replace #10 to adjust the rear toe properly. There are Manza and Megan rear toe arms out there. Megans runs about twice the price of Manza arms. I will be also doing the M3/1M rear suspension soon and wonder IF I will need these rear toe arms. ??? https://www.e90post.com/forums/showthread.php?t=1075804 something like this... http://www.manzousa.com/index.php/bm...-m-models.html Dackel PS: Your ride height looks perfect to me. Not slammed at all. HP Autosport has some insight on what parts are needed?
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Yeineken1300.50 |
01-17-2019, 06:35 PM | #11 |
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@Dackelone yes all arms have been replaced with M and M3 subframe. #10 was replaced with ECS trailing arms. #10 is also the same part across 135is and 1M/M3s. I still need to get it on the lift and make sure the ECS trailing arms are the same length as OEM.
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01-18-2019, 03:32 PM | #12 | |
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Ended up talking to someone at Dinan to check on the range of adjustability on their toe arm (considering this brand) and here's what one of their engineers had to say.
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Also starting to contemplate this is just a bad alignment job. my car: m3:
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01-18-2019, 04:02 PM | #13 | |
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Is it adjustable like the Manza unit I posted? Yes, #10 is the same arm used on a M3/1M and a non M car(like a 135i). That is why you need to replace this part with a link(that is adjustable, like Manza or Megan) to bring your rear toe back to factory specs. Perhaps you should have a second alignment shop take a look at your car. Maybe the first shop just wasn't comfortable working on your hybrid M suspension. ? Dack
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01-18-2019, 04:18 PM | #14 | |
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#10 is the trailing arm that is the same across non-m and m. - ecs trailing arms. https://www.ecstuning.com/b-ecs-part...SABEgJN7PD_BwE which are direct replacements for #10.
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01-27-2019, 08:44 AM | #15 |
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Bit of an update.
The trailing arms are not the problem. They are the exact same size between stock and ecs. So this leads me to think it is possible that the knuckles between the 1M and 135i are more different than I thought. For the time being upgraded to the Dinan toe arms and raised the rear slightly with the TCKline adjusters. Will update again when I get the alignment done.
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02-05-2019, 04:55 PM | #17 |
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Not really. The Dinan toe arms fixed the problem. As to why the OEM M3 arms with M3 rear subframe didn't not work is still up in the air.
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