03-26-2020, 09:57 PM | #89 | |
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Do some more reading about it. Modern suspension systems are designed with a compressible bump stop and the bump stop is in use a lot more than you would think. The basic concept is that the bump stop is used to create a variable rate spring that reduces body roll by firming up rapidly under compression around turns. |
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03-27-2020, 11:53 PM | #90 | |
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From my experience of working on suspension components in the past, non of the bump stops showed any sign of stress marks, so I figured they’re there as a ‘crash pad’. Thanks for sharing the information. |
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03-31-2020, 08:31 AM | #91 |
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That's crazy I thought bump stops were last resort energy reduction to reduce damage to shocks or chassis? According to above they're an integrally used part of suspension travel?
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04-01-2020, 12:30 AM | #92 | |
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The MRC suspension on my previous Camaro didn’t even have one. I guess it depends on the design. |
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04-03-2020, 05:23 AM | #93 |
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FWIW, on my MPerf coilovers even at oem ride height settings, there was plenty of free movement of strut damper rod before the b/stop came into play., enabling combo of v firm springs and good damping tweaks to be effective.
Not so at the rear, damper stroke minimal before rear b/stops came into play but prohibiting the damper effectiveness and weight transfer to the rear. Trimmed 10mm off both rear bumpstops allows more damper stroke. With tweaking the damper settings, my car has more rear wheel travel with effective damping which translates to far better use of tyres - more traction and conering grip. In general, my car's manners have improved too esp if pedalling along a bumpy A or B road - both ends of the cars working more cohesively than before whether 1 up or 4 up.
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04-03-2020, 11:03 AM | #94 |
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Don't forget about motion ratios when thinking about damper stroke. With the rears in particular, since the damper is further inboard of the wheel carrier that means the damper moves less than the wheel does. On my F31 that motion ratio is about 0.84. In the front, since the damper mounts to the knuckle itself, it has a higher motion ratio and the damper travel is much closer to the actual wheel travel.
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04-03-2020, 06:04 PM | #95 | |
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With adjustable dampers, the bump response can be tweaked so bstops role is more to prohibit bottoming out. Chopping the bstops on my car has worked a charm but I wouldn't recommend as a default mod for everyone.
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04-06-2020, 03:02 AM | #96 |
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How is the balance of the car with these springs? Does it have more or less understeer?
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05-02-2020, 02:15 AM | #99 |
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Lockdown probably messing up R&D plans just now 🤔
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05-08-2020, 01:14 PM | #101 |
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Just got some there from evolve. Will fit them when I'm home in about 2 weeks. Kinda wanted to do a drop of about 15mm on the front and 5 on the rear. As previous comment said anymore feed back would be great as this is the only info I could find on them !
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05-24-2020, 03:14 AM | #104 |
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So did we ever find out if not replacing the rear bump stop (or at least trimming it) will be an issue? I'm about ready to pull the trigger on these but wanna be sure I'm not going to kill my stock rear bump stops...
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06-10-2020, 06:50 PM | #106 |
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No real update Detox. My original review still stands, and now I've got used to them, they feel stock to me, which I think was their plan and my requirement.
I've noticed a couple of bad potholes transferring to the cabin, but then that's a fact of life in Sydney. My regular Sunday morning circuit is showing the same behaviour I reported above, with traction light (depending on mode of course) coming on later than stock. There's no uncomfortable "bounce" that I've heard with other kits. Whether that's because I didn't slam it to the ground (15mm drop all round), I don't know, but I figure a medium drop will do the dampers a favor whilst Evolve hopefully come up with the matched Bilstein damper they said was being worked on. |
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06-11-2020, 01:30 PM | #107 |
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Maybe worth subscribing to this thread
Video: MSS Height Adjustable Spring System for F8X https://f80.bimmerpost.com/forums/sh....php?t=1690765
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06-12-2020, 07:12 PM | #108 |
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By the time I put PS4S on the car after doing the carbon brace not sure I feel the need for aftermarket springs MSS or otherwise now.
I wouldn't know what I'd be trying to achieve and not having a goal is pointless. The car is so transformed by the brace at slow speeds and when getting on it in the Twisties. The car is intuitive and not skittish anymore. So why upset things and spend cash without reason? I'd sooner update the intercooler now tbh as heatsoak seems apparent to me as an issue I'd like to go away. |
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06-12-2020, 07:50 PM | #109 | |
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Please don’t misunderstand my comment that I’m trying to dissuade people from buying MSS springs... that’s not my intention at all. Whatever improvements the MSS springs (or any other after market upgrade) make will be further improved by doing the brace retrofit. And without doing the retrofit you’re not giving the stock suspension or any aftermarket upgrades the chance to work at their best. |
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06-13-2020, 02:02 AM | #110 | |
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I agree 100% with yrs and Nezil's sentiments about the F8x alloy (and CFRP) brace retrofit. It reads like on road you're happy with where yr car is at. No offence intended but perhaps the next area to focus on is driver tuition ? If not, and wanting to fettle the cars hardware alittle further, any HAS is a cost effective way to add the ability to corner weight the car. Not to be dismissed if done properly and will help even a road car in the twisties.
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