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E9X bumpstops
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01-27-2012, 11:19 PM | #1 |
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Just wanted to share with those who've been talking about bumpstops and sport (non-c/o) springs lately:
I've wanted to get the BMW PS springs for over a year to go with my koni's. I didn't want the whole 'new' PS kit because of how lousy my oe zsp dampers were and just figured the koni's would have better (and adjustable) damping than whatever BMW provides w/the PS kit. The PS kit dampers were engineered to be used with runflats and I've been off of those for 3 yrs and have <19 lb wheels. The PS springs have been available for over 2 years but you couldn't get the front PS bumpstops seperate from the kit (I've been asking Tischer for over a year). The rear PS bstops have been available. Lot's of folks have added the PS springs to the 'original' or V1 PS kit but that kit was engineered to be used w/zsp springs. Anyway, I didn't want to mismatch springs and bumpstops, so after 1-2 yrs of waiting I contacted Dan@UnitedBMW (1addicts vendor) ; he contacted BMWNA about getting the front PS bstops seperately and voila-1 month later I've got 'em I want to thank a few of you guys that have the new V2 PS kit for answering some questions I've read a few threads where people are installing PS or aftermarket sport springs and wondering what to do about bstops. I think jwong77 and luckyu have used the E36 M3 front and Z4 rear bstops and are happy with the results (this might be what Dinan uses for their E9X susp kits). But if you're going to install the PS springs, why not use the bstops engineered to work w/those springs? They're used as a secondary spring after all. The p/n is 31 33 6 789 540. For comparison's sake I measured the height of the old v1 and new v2 PS bstops and the zsp bstops. The v1 bstops feel alot firmer than the other 2 and are taller; the front v2 bstops are firmer and shorter than zsp; the rear v2 bstops are shorter than zsp and feel close in firmness. I have no way to measure density or rate with these bstops but here are the measurements: From left to right are: ZSP F-2 3/4", V1 F-3 1/16", V2 F-2 3/8", ZSP R-2 7/8", V1 R-3 1/8", and V2 R-2 5/8" Last edited by cvc 22349a; 01-27-2012 at 11:52 PM.. Reason: sp |
01-28-2012, 04:39 AM | #2 |
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So just for clarification; your suspension is Koni (yellow?) dampers, BMW PS springs (yellow ones?) and V2 PS bumpstops? Can you provide a performance and ride quality review compared to your old zsp suspension? Thanks.
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01-28-2012, 09:54 AM | #3 |
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Sure, when I get the PS springs installed. Still riding on the zsp springs and koni sports.
'Freelo' has PS springs and koni sports on his car, but I think he still has the zsp bstops which is definately better than riding on the v1 PS bstops.
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01-28-2012, 01:06 PM | #4 | |
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Regarding your comment about non-rft's and lighter wheels, can you elaborate on why such a set-up would motivate you to avoid the ps dampers? I'm planning on an v1 PS install and am curious about the effects of less unsprung weight with that setup. |
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01-28-2012, 01:23 PM | #5 | |
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01-28-2012, 01:27 PM | #6 |
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thanks, just trying to understand the effect
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01-28-2012, 07:17 PM | #7 |
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Great post, and good job getting BMW to make these available!
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2007 328i ZSP. M3 suspension: custom valved Bilstein shocks, Hyperco race springs, M3 lower control arms front and rear, M3 sway bars, and M3 subframe bushings. E46 front guide supports. Euro tail lights.
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01-28-2012, 08:32 PM | #8 |
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Great ! This is one of those must-bookmark threads, as this info is for the 1st time now available. I think I agree these are prob the best fit for the PS yellows, although from the application lists for the p/n's it seems to me like a parts bin approach by BMW. Thanks cvc !
The only other comparo I'd personally be interested in is against the E36 M3 front and Z4 rear bstops set mentioned in the OP, which have been used by some people because the v2 bstops were not avail to order. If someone has them pls post the heights.
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01-29-2012, 09:46 PM | #9 |
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Thx again for those v1 bstpos I'll pass 'em along if I'm happy w/the PS springs
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01-29-2012, 09:49 PM | #10 | |
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01-30-2012, 03:19 PM | #11 |
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I wish I had measured the bumpstops prior to installing them in my car.
Anyways, good job on getting the PS bumpstops available. If I wasn't so happy with my setup, I would be interested in these bumpstops as well.
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01-30-2012, 03:43 PM | #12 |
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As cvc 22349a pointed out, I have the Koni sports with the BMW performance springs (the newer ones), but I am just using the ZSP bumpstops.
I'm very interested to hear the review on this. As I guessed, there seems to be a bigger difference in the front bumpstops, which makes sense since there is more lowering with the BMW performance springs in the front. My ride is very good now, but I wonder if it would remove a bit of the bounciness still present in the front if I changed to these PS v2 bumpstops. Any experts able to chime in on what a difference the switch to the shorter matched PS bumpstops should make?
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01-30-2012, 05:22 PM | #13 | |
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I noticed you have Velocity toe arms. Do you feel any difference in everyday driving from those?
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01-30-2012, 05:56 PM | #14 |
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Thanks luckyu for your advice on this. Makes sense to change when I have the next opportunity. I'll contact the vendor that has these parts.
The Velocity toe arms. They are solid looking parts for sure and the OEM toe arms are pretty flimsy. I do not think you'd notice the difference when you are in everyday driving. However, when I am really pushing the car at its limits in turns, I now have dramaticall improved stability. The theory is the rear axle maintains proper camber and minimum deflection. I cannot isolate the toe arms too specifically, however, since I did the subframe bushings and guide arms at the same time.
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Koni sport shocks, BMW performance springs, M3 arms and sways front and rear, M3 subframe bushings, Velocity toe arms, M3 front strut bar, Cobb, ETS FMIC, Vishnu charge pipe, RPI scoops, M3 steering wheel, M3 carbon leather interior trim, Advan RS 18 inch wheels, Pilot sport tires
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01-30-2012, 06:53 PM | #15 | |
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2007 328i ZSP. M3 suspension: custom valved Bilstein shocks, Hyperco race springs, M3 lower control arms front and rear, M3 sway bars, and M3 subframe bushings. E46 front guide supports. Euro tail lights.
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01-31-2012, 11:11 AM | #18 |
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true, though on a car that isn't lowered much (if at all), I doubt it's anything to worry about. Especially on the longer bumpstops like what I had on my car.
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02-01-2012, 02:23 PM | #19 | |
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btw, thx for answering previous pm questions
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2007 E90 335i, TiAg, 6AT, ZPP, ZSP, ZCW, 6FL, HD
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02-01-2012, 02:26 PM | #20 |
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+100
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2007 E90 335i, TiAg, 6AT, ZPP, ZSP, ZCW, 6FL, HD
Quaife lsd, ETS fmic, GIAC s/w, Dinan intake/exhaust/oc, Koni/M3 susp, Apex Arc 8, Mich PSS |
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02-01-2012, 02:28 PM | #21 |
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I'll let you drive my car again when I get 'em installed but that won't be for a while. Springs first then toe links and alignment.
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2007 E90 335i, TiAg, 6AT, ZPP, ZSP, ZCW, 6FL, HD
Quaife lsd, ETS fmic, GIAC s/w, Dinan intake/exhaust/oc, Koni/M3 susp, Apex Arc 8, Mich PSS |
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