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03-05-2024, 04:17 PM | #1 |
First Lieutenant
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Drives: 2013 BMW 135is
Join Date: Nov 2016
Location: San Francisco, CA
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BMW 135is CONVERTIBLE Suspension Refresh Upgrade
I saw this thread https://www.1addicts.com/forums/show....php?t=1567496 and this thread https://www.1addicts.com/forums/show....php?t=1203243 and this thread https://www.1addicts.com/forums/show....php?t=1147857
but I noticed all these threads are for the coupe. I'd think the only real difference is shock and springs. Now, my real struggle is when going out and sourcing parts... trying to find the parts for the convertible is hard. Bilstein, Ohlins, Koni, Eibach, etc. all really don't list accurate descriptions for parts out there. There's *no way* the shocks for a 128i and a 135i should be the same on a convertible and yet some manufacturers suggest the same shocks. You look at coupe shocks and they break it down by 128 and 135. They do this for springs too - which to me screams it even more insane. Originally, I had this idea of redoing my whole suspension setup, getting some kinda wacky square setup, and yadda yadda... but I've given up on that. I just need something that is slightly better than OEM and I'm gonna replace some inserts and whatnot. (rear subframe, transmission, whatever else is recommended) Any suggestions? It would be nice if there was someone with a 135i convertible that could chime in with what they did and if it works great. I'm looking for stock ride height and all that because I need as much suspension travel as I can get with the roads in the bay. |
03-05-2024, 04:28 PM | #2 |
Brigadier General
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It might be obvious, but differences are usually due to weight of the car at either corner, and whatever ride characteristics they wanted baked in. It's almost certain parts will physically swap but there's a chance ride height might be a little higher or lower (or stiffer or softer) than whatever was the intended application. Not too surprised the shocks are the same if the spring rates were actually similar.
Not the answer tot he question but maybe something to think about if you are considering parts from another application. |
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03-08-2024, 02:37 PM | #3 |
Lieutenant
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ST Suspensions lists different part numbers for the coupe and convertible coilovers. I'd assume it's because the rear parts are different. You can reach out to them to see what the differences are.
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04-13-2024, 09:15 AM | #5 |
Enlisted Member
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Drives: 08 135 6MT vert
Join Date: May 2019
Location: Charlotte, NC
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When I finally realized after 10 years (150k miles) my 135 e88 suspension needed help 6 years ago, I went with Koni Yellows (adjustable front). Kept the factory sport springs, and added Whiteline RSFB inserts. That was a great day! Transformed the car, and 45k miles later it is still sweet. It is a DD for spirited driving (modest needs). It also has a Dinan stage 1 tune from around the same time.
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