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03-09-2011, 10:57 PM | #23 |
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Since you already have ZCP, the only thing I would do is to get a high-end coil over... at least KW CS or equivalent. Don't bother with the lower end set ups. The M3's suspension, while somewhat soft, is very competent and predictable, and you haven't experienced its true potential until you've taken it onto the track.
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10-29-2012, 01:28 AM | #26 | |
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05-30-2013, 04:40 PM | #29 |
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pardon my ignorance, but are people pairing lowering springs with e36 bump stops because they are shorter and the car wont be constantly riding on the oem bump stops?
how does the ride quality/handling differ between a car lowered on springs with and without modified bump stops? thanks! |
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06-24-2015, 09:42 PM | #32 | ||
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2 potential reasons why they don't: - The drop isn't as low as the H&R or RD sport etc - Swifts are linear springs as opposed to progressive like most of the ones available for our cars Another reason why I stuck to the e92 bump stops is that BMW builds modern cars to ride on bump stops. There is a lot of technical details about it on this site and others. So I had to consider the fact that there must have been some advancement in the quality/material/condition of the current bump stops versus ones built for the e36.
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Current Bimmer: '16 F80 M3, '20 F87 M2c Gone but never forgotten: '13 FO e92 M3, Swifts, volks/advan, Akra Evo, Kics R40 Past: Alpine white e46 323i, Jet Black e39 530, Saph Black e60 530, Space Grey N54 e92 335, Mineral White N55 e92 335 |
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09-30-2018, 12:45 AM | #33 |
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Since this thread starts off talking about bump stops, I thought I'd share my research on this topic with the community.
While its been well documented that the E9x M3 stock suspension engages the bumpstops after just a small travel, I hadn't found any hard data on the bumpstop spring rate or what the force-compression curve looks like. For the hard core track folks who's stiff springs keep them mostly off the bumpstops this won't matter so much. But for those of us considering tweaking our street cars to still be primarily street cars, knowing the bumpstop rates helps us understand the stock suspension baseline better. I bought a fresh new E92 front bumpstop to measure it (and not be thrown off by tired 10-year-old foam). My measurement system was a hydraulic press, a dial indicator, and a bathroom scale. The bathroom scale tops out at 350lb so that's the limit of my data but that turned out to be enough. To get the bumpstop to behave properly the center needs to be supported with a shaft as it would be on the car (otherwise the bumpstop folds over), so I fashioned a support shaft, then a top plate with a hole for the shaft to pass through and a larger collar to press down on the top plate to compress the whole thing. I took two passes up and down in travel. I had a lot of stiction between the shaft in the center and the inner surface of the bumpstop which caused the offset in force for one of the passes. But I show all the data including this because the slopes are consistent despite the offset. Here's the data I was actually a bit surprised to see the initial rate is so low at about 100 lb/in. Then after about an inch of travel the bumstop starts to stiffen up a lot, reaching about 700 lb/in by 1.5" of compression From this data I'd say the stock bumpstop makes an effective progressive spring, the first half-inch or so (on my car it measures a bit over 3/4" but others including Steve Dinan reported only 1/2") of travel without engaging the stop is about 160 lb/in (stock front springs), then the next inch of travel adds 100lb/in for total 260 lb/in rate, and after that the stop starts to get rigid and becomes truly a "stop". I also acquired an E36 bump stop to compare. The stop is slightly shorter as others have reported, but the initial rate is very similar. The transition to the stiff 700 lb/in rate occurs a couple tenths of an inch sooner, similar to the overall shorter length of the E6 vs E92 bumpstop. These characteristics make it a good option if you're looking to retain the stock bumpstop behavior but need it slightly shorter.
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2008 E92 6MT carbon roof (sunroof would burn my bald spot) Last edited by MidLifeM3; 09-30-2018 at 12:53 AM.. |
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