04-22-2020, 12:40 AM | #1 |
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Rear Strut Brace
Anybody look into tower braces for the rear on the F87 M2?
My friend has just installed his AST 5100 which have a CO design, now he's been concerned about potential structural weak points of the car and looking for options of reinforcement. Only one I can really find is this: https://ultraracing-usa.com/bmw-m2-f...ts-adjustable/
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04-22-2020, 06:34 AM | #2 |
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The main problem with these cars is the loose nut behind the wheel.
Hope the advertising strategy goes well in the meantime. |
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04-22-2020, 09:35 AM | #3 | |
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Mason Engineering do superb X braces for e series m3. Photo attached hopefully illustrates my point....
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04-22-2020, 12:35 PM | #4 | ||
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04-22-2020, 01:08 PM | #6 |
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BAF Motorsport here in the UK make one for BMW F2x series that will fit F87....
http://www.bafmotorsport.co.uk/bmw-1...ar-strut-brace
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04-22-2020, 07:49 PM | #7 | |
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04-23-2020, 02:14 PM | #8 | |
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I used those from Japan, they work noticable well: |
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04-23-2020, 03:01 PM | #9 |
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Thanks! I'll be looking into it more soon. Warranty is up this year so finally gonna grab some charge pipes, turbo outlet, intercooler, vtt cbc (already have it and ready to go) plus alot of other small supporting mods.
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04-24-2020, 12:01 PM | #10 |
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These ARC Power rear braces Peter_VIE mentioned look pretty interesting. Looks like the type 4 upper and lower carbon fiber braces go for 38k yen each, or about $350 USD each on their website, but I can't figure out how you would purchase them: https://translate.google.com/transla...torefine.co.jp
Any thoughts on how well these might perform? It looks like the upper brace might be beneficial but the lower brace might not be very effective unless it were tied together like an x brace.
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Last edited by nothingman; 04-24-2020 at 12:17 PM.. |
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04-24-2020, 12:54 PM | #11 |
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I just ordered the BAF in black, Will report back when I install it.
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04-24-2020, 01:24 PM | #12 |
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BAF and Mason look like the best ones so far but Mason doesn't seem to have anything for the newer models, according to their website.
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04-24-2020, 02:47 PM | #13 | |
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04-24-2020, 04:01 PM | #14 | |
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04-25-2020, 03:34 AM | #15 |
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04-25-2020, 03:44 AM | #16 | |
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Ah so there is a concern of coilovers (if I am under standing correctly) possibly causing damage to the structure of the car? Well braces probably wouldn't help too much. For the E46 the only solution was to spot weld through the two layers of the frame and use spray foam, and thicken critical mounting points with the reinforcement plates. There should be no concern with the 2 series chassis imo (especially with just coilovers...), Bmw races this chassis professionally (along with countless smaller race teams) and there have been alot of enthusiasts that have beaten on this chassis without issue. IF there was a structural weakness then the only real solution would be reinforcement plates like on the e46, or perhaps a full cage.
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04-25-2020, 03:47 AM | #17 |
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looking forward to seeing the results.
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04-25-2020, 11:48 AM | #18 | |
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Also the design seems faulty. Directing all of the force to a single point in the center of the top tube. Maybe the steel is strong enough to handle the force. Or maybe I'm totally wrong about it being a problem in the first place. I'm not an engineer, so correct me with why I'm wrong. But I imagine something like this would be more effective. And could be made of lightweight carbon. |
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04-25-2020, 02:43 PM | #19 | |
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04-25-2020, 03:26 PM | #20 |
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I think the utility of it is more to distribute the load created by the suspension. By stiffening the chassis you force the load to stay in the in the suspension instead of flexing the chassis. The suspension is there to work, as much as possible.
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04-25-2020, 03:55 PM | #21 |
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Well, the extra bracing at the front on the M2C does appear to make a difference, so good point.
But, BMW don't fit anything like the items earlier in this thread to either their M235i Racing, or their M4 GT4. These lack the rear seat back too, so it appears if this is an area that BMW's engineers are concerned about under the loads imposed by racing, the roll cage is dealing with it. Obviously, the condition of many public roads may impose stresses and strains not anticipated by BMW's engineers (have a look at GMs reaction to the destruction of their prototypes on Australian roads). But, it still sounds like yet another instance of superfluous bracing for commercial reasons by aftermarket suppliers... |
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04-25-2020, 05:42 PM | #22 | |
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I am honestly ready to do anything to make my M2 more comfortable/compliant and that's why I bought a OEM used front strut brace. The roads are so bad around here and it's hard to make fine tune the compromise with streetability and track ability..
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