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Re: SLS - ETM?, BSG? general comments on SLS (archive)
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Posted by Joe on May 28, 2002 at 10:18:21:

In Reply to: Re: SLS - Check the `88 M6 ETM posted by Ron Serafine -Bronzit M6,`88M5,CeylonTII on May 25, 2002 at 23:24:05:

Ron, questions are for the E-28 '88 M5 SLS. I assume ETM is an Electrical Tech Manual? I don't have access to a BMW Electrical manual -- is it available online? I suppose I should break down and get one. I don't have email or I'd ask you to forward your MSWord write up one more time. What is the BCG technical library and is it available online?

I'm glad I took a look to figure out how the SLS works. I had some misconceptions that the SLS was an active suspension system, which it is not. The system response is too slow to do anything other than correct for rear axle static loading, such as having the trunk full of gold bars or three adults in the back seat. I think the SLS set-up as implemented actually exacerbates body roll in cornering because the two shocks are hydraulically linked. In a cornering situation, only the (relatively) small diameter of the hydraulic lines and (possibly) a metered orifice in the T-block would prevent the higher pressure in the compressed shock from working to extend further the already extended shock, thus making the body roll worse. While I like the idea of keeping the car original, I'm now leaning toward disabling the SLS when it comes time to replace the rear shocks.

I still don't know a good test to determine whether an accumulator is shot without removing it from the car. Any thoughts?

Thanks, Joe

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