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07-17-2017, 02:52 PM | #1 |
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Upgrading 135is Rear Bushings / Front Control Arms - Suggestions Needed
I've been doing research on the best route to tighten up my suspension after adding my eibach lowering springs and I'm hoping to get suggestions with this thread.
I read through both the threads at the top of this section about front and rear control arms upgrades and came to the conclusion that it seems only the front arms are worth upgrading and that the rear subframe bushings are the best upgrade for the rear. As of now I am planning on buying both of these kits: Rear bushing kit: https://www.ecstuning.com/b-assemble...3326763092kt1/ M3 front control arms kit: https://www.ecstuning.com/b-trw-part...1102283577mkt/ Should I buy that entire rear bushing kit or I should I only buy the subframe bushings by themselves? I received an install quote from my local shop, they said $1000 total in labor to install both kits if I provide parts. Is this reasonable? I am pretty green when it comes to suspension work/tech so please bear with me
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07-17-2017, 03:25 PM | #2 |
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The rear bushing kit is overkill.
Do whiteline inserts, whiteline bushings or just the M3 bushings. Replacing the front control arms is one of the easiest things you will ever do on this car. Look up threads to see how it is done. Final tighten on the ground!!!! Get an alignment.
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07-17-2017, 03:29 PM | #3 | |
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I would just add that your stock factory shocks are not great, and you should probably upgrade them to something like a Bilstein B8 or Koni setup that will better match the Eibachs. It would be a shame to spend $1000 and still have factory shocks... |
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07-17-2017, 06:43 PM | #4 | ||
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07-17-2017, 08:34 PM | #6 | |
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As Suprgnat indicated above, they are the shocks that are included in the M Sport suspension. Last edited by Esteban; 07-17-2017 at 09:43 PM.. |
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07-18-2017, 08:51 AM | #7 | |
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Yes as others have said, the "sport" package suspension is the same as the "m-sport" package suspension and is what comes on all 1 series cars if optioned that way (including 135is). The M Performance suspension is an upgrade available separately from BMW. I would recommend you add beefier shocks either from the M Performance suspension or other quality aftermarket brands like Bilstein, Koni etc. Last edited by asbrr; 07-18-2017 at 12:09 PM.. Reason: edit |
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07-18-2017, 07:31 PM | #8 | |
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Sounds like the general consensus is I should get some new shocks too. I'm just looking to upgrade slowly but surely.
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07-18-2017, 07:59 PM | #9 |
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Do something to firm up the rear toe arms. Either bushings or aftermarket arms.
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07-18-2017, 08:00 PM | #10 |
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The point to remember is that there are some economies to be had by doing multiple tasks at once. Like "while you're doing X, it also makes sense to do Y." Ask your shop or the experts here what to do at the same time.
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07-18-2017, 09:05 PM | #11 |
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If your car is a 2013 model and not travelled unusually high mileage, it seems a bit too soon to be replacing every bushing.
Both the shocks and rear subframe bushings are major weakness, so you might as well have the work done at the same time. Especially if you are installing M3 front arms. You should save on the workshop time and you don't need to go back and forward to the wheel alignment shop after every step. If you get the rear subframe bushings installed by a shop you will probably pay quite a lot no matter which rear bushings are used. I would say the M3 rear subframe bushings are an excellent quality and very durable option. It would be a pity to install some polyurethane part that will later start squeaking, degrade or crack. |
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07-19-2017, 11:00 AM | #12 | |
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This is a fair point. I think what I will have done first is the lowering springs + front control arms at the same time. Then in a couple months I'll go back for shock install once I decide on which ones to go with.
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07-19-2017, 11:03 AM | #13 | |
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07-19-2017, 11:17 AM | #14 | |
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I'd just recommend doing more research now and deciding on shocks, so you do them at the same time. Bushings etc are mostly a separate labour item with not too much overlap of shock/spring install. |
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07-19-2017, 10:08 PM | #15 | |
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My take aways from all of this: I have M wishbones, guide rods, camber arms, and Rogue toe arms. I'll take the combined weight savings of all the ///M rear components and they're a minor upgrade to overall stiffness and bushing compliance. I like the way they behave as as system, but have no objective data to back that up. ISTG, every time I limit bushing compliance my car gets more fun to drive. It's a curse. I swore I wouldn't do it this time. For no good reason, I also think the rear trailing arm bushings have been (largely) ignored. They are an equal partner in the overall suspension geometry. I'm looking at Genuine Group-N rubber and/or various aftermarket spherical options, and have a rear hub lying around with which to design a bushing extraction/installation tool. It'll happen when it happens, if it happens. I promised my Dad I'd get back to the Healey. Nah, I can do both! BTW, the Rogue toe arms were installed at 4915 miles along with the ///M wishbones and guides, and now all have an additional 27336 miles on them and are going strong. I purchased upgraded spherical bearings years ago and have yet to use them. On the other hand the original "Seals-it" seals have done their job and need replacement. My car has relatively low miles, but no one would say they've been easy
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Last edited by Suprgnat; 07-19-2017 at 10:37 PM.. |
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07-19-2017, 10:44 PM | #16 | |
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07-20-2017, 04:30 PM | #17 | |
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They are quoting me $550 in labor to install all 4 m3 front control arms, eibach springs, the aftermarket shocks, and alignment. I think it seems like a very fair deal. I am thinking about going with these shocks... mostly because my car is my daily and a 95% street car 5% track. https://www.ecstuning.com/b-koni-par.../21004036~kon/ Any other recommendations?
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07-20-2017, 04:42 PM | #18 | |
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The FSD's are good for a smooth ride, and replacement for the stock shocks. With a stiffer and lower spring like the Eibach, my personal preference would be to look at something like the Koni Sport shocks (Yellow) https://www.ecstuning.com/b-koni-par...rt/e9xkonispt/ Some folks have run the FSD for occasional track use - it's really about preference so do lots of reading/research on other peoples experience if you are not in a rush. |
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07-20-2017, 08:32 PM | #19 |
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So I'm working on the same issue for my IS, and I would not consider the FSDs. I have the FSDs on my e90, and they are better than the stock IS suspension, they just still like I'm driving my sofa. Mind you I came from a MINI, but I still prefer a more sporty ride, but still needs to handle the terrible roads here in Cincinnati...
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07-20-2017, 11:16 PM | #20 |
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If this is to remain a street car, upgrade the front control arm and rear subframe bushings to M3 and you will get a night and day difference. There is no need to do the entire rear kit.
$1000 is really good for the amount of work involved installing all those bushings. |
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07-26-2017, 06:01 PM | #21 |
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So I have decided to go with an ST Coilover kit as apposed to matching shocks/struts up with another brand of springs.
Next month I will be doing the m3 front controller arms and m3 subframe bushings, which I just won on an ebay auction for $115 for all 4 bushings. Does this sound like a solid path? I have the same shop doing the installs and they warranty the alignment for 6 months, including if I bring it back for more suspension work.
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07-26-2017, 09:38 PM | #22 |
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ST coilovers have unusual spring rates where the rear spring rate is too soft relative to the front. It may have been a deliberate design compromise to accept the stock rear subframe bushings, which may not tolerate higher rear spring rates.
KW V2 would be a better choice from a performance point of view, but I'm concerned it may not ride as well as some of the possible combos using the BMW performance springs. Also if you go for Koni or KW style adjustable dampers you will have trouble to access the top adjust points due to the position of the stock strut reinforcement bar. It will also prevent the installation of the dust caps for the front strut bearings. 1M coupe strut reinforcement bar is a good solution to solve these issues, but costs some $. |
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