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Lowering advice please

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clayjo
Posts: 13
Joined: Fri Mar 15, 2013 6:00 pm
Location: Wilton, CT

Lowering advice please

Post by clayjo » Mon Mar 05, 2018 3:26 pm

I have an 88 US 635csi and may be in need of new front struts. I have the SLS in the back and everything is still functional well (imagine that)?!

Is there a setup that allows me to lower the front a little and adjust the SLS ride height in the rear? I have 16” rims and not an overly aggressive driver.

Or if there’s already a thread someone is aware of, please point me in the right direction. Couldn’t find much with SLS components.

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Brucey
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Re: Lowering advice please

Post by Brucey » Mon Mar 05, 2018 5:13 pm

you can buy lowering springs for the front that will give about a 1" drop. You can make fine adjustments with the rubber spring pads. These springs work with standard length strut inserts, eg Bilstein HDs (B6). Lowering any more than that gets you into a regime where the camber angles are screwed up enough that you will likely get bad tyre wear unless corrected.

At the rear a (ghetto) solution is to simply cut a turn out of the standard SLS springs, and/or adjust the SLS ride height correction (which is on a closed loop feedback via a linkage) accordingly.

cheers
~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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Bostn635csi
Posts: 40
Joined: Thu Jun 19, 2014 11:40 pm
Location: Boston

Re: Lowering advice please

Post by Bostn635csi » Tue Mar 20, 2018 9:40 pm

Hello, I bought my front springs from Ireland Engineering. Lowered front by 1".
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Kevin
1988 BMW 635csi, 5-speed
Lachsilber

SORIANOTRON
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Joined: Tue Oct 31, 2017 7:58 pm
Location: Honolulu

Re: Lowering advice please

Post by SORIANOTRON » Thu Apr 05, 2018 2:53 am

looks very nice man, well done =D>

clayjo
Posts: 13
Joined: Fri Mar 15, 2013 6:00 pm
Location: Wilton, CT

Re: Lowering advice please

Post by clayjo » Tue Apr 17, 2018 9:46 pm

nice one Mr. Bostn635! Do you have SLS in the rear too?

Can anybody recommend a different strut insert other than Billstein? Can't find them anywhere. Backordered from Billstein. I assume i just need the inserts?

Bilstein B6 Performance Shocks - 34-002339

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Bostn635csi
Posts: 40
Joined: Thu Jun 19, 2014 11:40 pm
Location: Boston

Re: Lowering advice please

Post by Bostn635csi » Tue May 15, 2018 2:11 am

Hello, my SLS was removed years ago. Replaced with Bilsteins and H&R springs.
Kevin
1988 BMW 635csi, 5-speed
Lachsilber

Tommys 89 635
Bigcoupe supporter
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Location: San Mateo, CA just South of San Francisco

Re: Lowering advice please

Post by Tommys 89 635 » Thu Jun 07, 2018 4:50 pm

Back in the day (I think late 90's) when my sls was going out, I decided I will never put much weight in the trunk and it was cheaper to replace the springs and shocks then replace the sls so I decided on the Dinan setup up which included Bilstein shocks. After a coupe years of rear tire wear, tire replacements and alignments, I decided to spend the money on the Dinan adjustable rear subframe kit. I wish I would have done earlier.
Unfort Dinan no longer manufacture anymore E24 products from what I understand but I believe Turner Motorsports and Ireland may have the camber kits. If you want to keep the sls then change the springs, I'm sure that there are folks on this site have done that and can chime in. If not, probably a good idea to get the rear camber kit. Good luck.
Tommy
1989 635 CSI (Second owner since 1995, driven daily and retired in 2013 to occasional driving)
2011 335D

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OnTheFritz
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Location: Tulsa, OK

Re: Lowering advice please

Post by OnTheFritz » Sun Jun 10, 2018 9:17 pm

I recently installed OE blue-stripe springs from an E30 (PN 31 33 1 127 503) in the front and lowered it by about 1-1.25in. They were the same size overall (height and diameter) but the coils were marginally thinner. Same number of turns. I also opted to retain the SLS since we somewhat recently got it working again. It rides just like it did with the original springs (yellow stripe, don't remember PN, I can go look), but you do have to trim the bump stops a bit. Cheap way to get more low on the front
8/87 635CSi A w/ Conforti chip, #3266516
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