Which bump stop to use for Billstein b12 pro kit?

Rosetta Stoned · 02-13-2016, 06:23 PM

This morning I installed just the rear shocks and springs due to time constraints. These are the B12 shocks with eibach pro springs. My car is non-sport 2007 335i so this should give it a mild drop. My question however is which bump stop & dust cover should be used? The bavauto howto video shows reusing the stock bump stop and cover but they were not changing springs. So I threw it back together that way for now and not driving it. See attached pics for the difference in travel with each stop, it's about 1 1/4" more with the new stop.

mweisdorfer · 02-13-2016, 08:51 PM

You don't use a bump stop. The bump stop is built into the strut.

I am assuming you changed out the upper/ upper & lower/ upper shock mounts for the rear.

The front, you should change out the strut bearings/ mount.

The car will take about 2,000 miles to fully break in and settle the new suspension. At that time, you will need to get an alignment done.

The rear should have came with a bump stop inside the dust cover. I would use the one provided.

martinblair · 02-13-2016, 10:58 PM

Use the Bilstein supplied bump stop, NOT the OEM in the rears. As you have it shown, it's the Bilstein supplied bump stop, washer, then the blue boot over it. I have the same B12 kit. For what it's worth there are no bump stops in the front, as its internal to the Bilstein strut. Same as what came up in the thread below.

Bilstein B8 (sports) installation help http://www.e90post.com/forums/showthread.php?t=1202520

PrematureApex · 02-14-2016, 08:51 AM

Quote:

Originally Posted by mweisdorfer

You don't use a bump stop. The bump stop is built into the strut.

?

He's clearly talking about the rear shock, not the front strut.

Rosetta Stoned · 02-14-2016, 10:16 AM

Thanks for the replies! Yes this is the rears only right now and I put new upper and lower mounts along with spring pads. I'll be doing the fronts next weekend, spending valentines with the wife and kids

and not in the garage today.

Rosetta Stoned · 02-16-2016, 03:26 PM

Just to add to the confusion I had about it. Bavauto who supplied the strut&spring kit replied back saying to reuse existing, turner motorsports who supplied the install kit said to use new ones. I'm going with the new ones but figured I'd mention that in case someone else happens to search as I did. As mentioned this is for the rears only since the fronts have integrated stops.

cdgatti · 02-16-2016, 03:48 PM

I spoke with a rep from bilstein when I installed mine as well as turner and Bavauto they all said use the bilstein supplied bumpstops. I did and they work great.

02-13-2016, 06:23 PM	#1
Rosetta Stoned Second Lieutenant 99 Rep 254 Posts Drives: 2022 M3, 2023 X3 Join Date: Sep 2009 Location: Denver CO iTrader: (2) Garage List 2023 BMW X3 M40i [0.00] 2022 BMW M3 Competi ... [0.00]	Which bump stop to use for Billstein b12 pro kit? This morning I installed just the rear shocks and springs due to time constraints. These are the B12 shocks with eibach pro springs. My car is non-sport 2007 335i so this should give it a mild drop. My question however is which bump stop & dust cover should be used? The bavauto howto video shows reusing the stock bump stop and cover but they were not changing springs. So I threw it back together that way for now and not driving it. See attached pics for the difference in travel with each stop, it's about 1 1/4" more with the new stop. Attached Images __________________ MINE: 2022 M3Cx, Sky Grey, Driv/Exec/Park/Laser 1/26 Ordered, 4/26 Prod, 5/4 Assembly, 5/9 Port, 7/11 Transit, 8/3 Port, 8/18 Dealer, 8/25 Delivered WIFE: 2023 x3 m40i Last edited by Rosetta Stoned; 02-13-2016 at 06:49 PM.. Reason: fix attachments
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02-13-2016, 08:51 PM	#2
mweisdorfer Major General 1904 Rep 6,968 Posts Drives: 2007 Black/Black 335i e90 Join Date: Apr 2011 Location: Holly, MI iTrader: (0) Garage List 2007 BMW E90 335i [0.00] 2008 bmw x5 [0.00]	You don't use a bump stop. The bump stop is built into the strut. I am assuming you changed out the upper/ upper & lower/ upper shock mounts for the rear. The front, you should change out the strut bearings/ mount. The car will take about 2,000 miles to fully break in and settle the new suspension. At that time, you will need to get an alignment done. The rear should have came with a bump stop inside the dust cover. I would use the one provided.
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02-13-2016, 10:58 PM	#3
martinblair Private First Class 31 Rep 138 Posts Drives: 2010 328i Touring Join Date: Jan 2015 Location: Edmonton, AB iTrader: (0) Garage List 2010 328i xDrive To ... [0.00]	Use the Bilstein supplied bump stop, NOT the OEM in the rears. As you have it shown, it's the Bilstein supplied bump stop, washer, then the blue boot over it. I have the same B12 kit. For what it's worth there are no bump stops in the front, as its internal to the Bilstein strut. Same as what came up in the thread below. Bilstein B8 (sports) installation help http://www.e90post.com/forums/showthread.php?t=1202520
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02-14-2016, 10:16 AM	#5
Rosetta Stoned Second Lieutenant 99 Rep 254 Posts Drives: 2022 M3, 2023 X3 Join Date: Sep 2009 Location: Denver CO iTrader: (2) Garage List 2023 BMW X3 M40i [0.00] 2022 BMW M3 Competi ... [0.00]	Thanks for the replies! Yes this is the rears only right now and I put new upper and lower mounts along with spring pads. I'll be doing the fronts next weekend, spending valentines with the wife and kids and not in the garage today. __________________ MINE: 2022 M3Cx, Sky Grey, Driv/Exec/Park/Laser 1/26 Ordered, 4/26 Prod, 5/4 Assembly, 5/9 Port, 7/11 Transit, 8/3 Port, 8/18 Dealer, 8/25 Delivered WIFE: 2023 x3 m40i
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02-16-2016, 03:26 PM	#6
Rosetta Stoned Second Lieutenant 99 Rep 254 Posts Drives: 2022 M3, 2023 X3 Join Date: Sep 2009 Location: Denver CO iTrader: (2) Garage List 2023 BMW X3 M40i [0.00] 2022 BMW M3 Competi ... [0.00]	Just to add to the confusion I had about it. Bavauto who supplied the strut&spring kit replied back saying to reuse existing, turner motorsports who supplied the install kit said to use new ones. I'm going with the new ones but figured I'd mention that in case someone else happens to search as I did. As mentioned this is for the rears only since the fronts have integrated stops. __________________ MINE: 2022 M3Cx, Sky Grey, Driv/Exec/Park/Laser 1/26 Ordered, 4/26 Prod, 5/4 Assembly, 5/9 Port, 7/11 Transit, 8/3 Port, 8/18 Dealer, 8/25 Delivered WIFE: 2023 x3 m40i
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02-16-2016, 03:48 PM	#7
cdgatti Colonel 255 Rep 2,547 Posts Drives: e90 328i Join Date: May 2011 Location: KY iTrader: (4)	I spoke with a rep from bilstein when I installed mine as well as turner and Bavauto they all said use the bilstein supplied bumpstops. I did and they work great. __________________ OEM Black grill and Blackline tails - LCI halogens with Lux V2 coded as DRL - 3M Crystalline - BMS PBX - OEM Euro Airbox with K&N - Hardwired CTEK - Bilstein B6 w/OEM springs and SP perches - Conti DWS06 - HiFi-Helix DSP - JLAudio HD/XD-Morel - CD changer trim - AE optical out
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