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02-12-2015, 07:15 PM | #24 |
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I am still of the approach that replacing all of those bushings to something completely solid would make the most difference... that is always the place of most flex.
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02-12-2015, 08:13 PM | #25 | |
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02-12-2015, 09:01 PM | #26 |
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Interesting that the trailing arms and their bushings are the same for the 135i and M3.
Found this online about a E90 M3 trailing arm failure that the owner could not remember any situation that would have caused it. The buckling away from the fuel tank and slow progressive failure is a strong argument to leave the trailing arms stock for safety reasons. http://www.m3post.com/forums/showthread.php?t=413117
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02-12-2015, 09:34 PM | #27 | |
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02-13-2015, 01:44 PM | #28 |
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02-20-2015, 03:18 AM | #29 | |
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Does anyone just sell the monoballs which fit in the guide rod inners and the upper wishbone as well or we are stuck with one mono and one bushing? I looked on realoem but the parts are sold complete with the mono/bush pressed into arms. |
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02-24-2015, 05:34 PM | #30 | ||
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Incidentally, the M3 rear arm ball joints are swaged in as you can see from the following section: |
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02-24-2015, 06:15 PM | #31 | |
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02-26-2015, 08:04 PM | #32 | |
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02-26-2015, 08:33 PM | #33 |
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My custom toe arms are now anodized and assembled. I am posting the ball joint assembly details because they are indicative of how the M arm ball joints are assembled.
As noted previously, the cavity that houses the ball joint is hemi-spherical. These internal components were salvaged from an M3 toe arm. Unlike some plastic ball joint bearings, this one is not split and it must be forced into position and fixtured there before the ball joint is permanently swaged. Here you can see that the plastic bearing does not fully seat itself in the cavity unless it is forced into place. This fixture presses on the plastic bearing directly to seat it fully. Pushing on the steel part of the ball joint is not effective in seating the plastic bearing. The geometry of the lip and of the swaging tooling required a bit of trial and error to develop, but the result is a consistent and sound swage, with no sign of cracking. And here is the big picture, showing the custom toe arms in comparison to the OE pressed steel part. The pin center-to-center distance of the custom arm is identical to that of the OE part. |
03-04-2015, 10:44 PM | #34 |
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Before installing the new arms I tested their compressive stiffness as an assembly vs. the OE toe arm.
My toe arms are identical in compressive stiffness to the M3 toe arms (which are approximately twice as stiff as the OE arms). Here they are installed: |
03-06-2015, 08:32 PM | #35 |
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The toe arms look very nice and should be durable too.
What do you think about swapping the lower camper arms for the M3 ones? Do you think change to the shock mounting would make much difference? |
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03-08-2015, 03:29 AM | #36 |
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From the info on the 1st post, the OE trailing arm is "safer" than the ECS trailing arms? So I take it there is no real benefit to changing out the trailing arms? Thoughts?
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03-08-2015, 07:06 AM | #37 | |
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http://www.1addicts.com/forums/showthread.php?t=1075240 I found the lower shock mount on the OE camber arm to be quite stiff - significantly stiffer than the upper mount. I haven't tested an M3 shock lower mount, but it would be shock dependant anyway, as it is part of the shock. The OE lower shock mount is stiff enough that I don't see it being a problem. |
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03-08-2015, 07:10 AM | #38 |
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Gap's post #26 illustrates this pretty well. The OE arm fails progressively away from the fuel tank and it bends rather than snaps. A broken suspension arm will let the wheel flail around more, presumably damaging more stuff.
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03-08-2015, 09:40 AM | #39 |
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If these parts don't provide any advantage, why would the BMW Motorsports engineers develop them? I don't think it's just to charge more for M cars.
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03-08-2015, 05:42 PM | #40 | |
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03-18-2015, 12:56 AM | #41 |
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Purely a guess: They are comprehensively redesigning the suspension. The suspension arms were redesigned to meet the target goal that the engineers at ///M specified (whatever that may be). I'm not engineer, but the way I read it, it appears that a lot of the 1M/M3 suspension arms are not independently "better" (however you want to quantify that) but all work cohesively with the changes to the knuckle, shocks, springs, etc. to meet their specific goals.
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05-06-2015, 08:16 AM | #43 | |
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