Hi,
I bought a rebuilt steering box from a company a while back. They said they were sure that the box was the special edition 850CSi one that had the quicker steering ratio, but when I ran the ZF part number on the steering box it seems like its from a regular 850/750i.
I thought someone on here would probably know and I want to see if I can get some info before I call the company and demand a refund because they seemed very unwilling to admit that its not the correct box when I first sent them an email about it.
The number on the box is: ZF 8054501241
This is my Steering Box out of a 1991 BMW 850, No idea what a CSI one looks like
They look the same but the part number should be different since the ratios are different.
workshop manual shows for all E31 a ratio of 13.5, E32 14.5, see page 32-16 https://www.bmwtechinfo.com/repair/main/941en/index.htm
Shogun tricks and tips for the E32 series are HERE!
So it's a lie that someone made up about how the CSi had quicker ratio than the others?
Well, I don't know who told you that, or what you were actually told -- but the CSi does in fact have a different steering box than the other 8 series cars. However, the ratio isn't what's different. Instead, the CSi's power steering assist is road speed sensitive, rather than engine speed sensitive. I assume the steering box is a different part; I'm sure the controller is also different.
Mike Barrett
94 850CSi, Hellrot over silbergrau dunkel/silbergrau hell
96 850Ci, Oxfordgrun over silbergrau hell
There are numerous steering boxes available for the E31 - and there are at least three Servotronic (Hydro Steering) modules to go with them. All Servotronic systems are road-speed sensitive but I would guess there is a difference in speed-to-assistance mapping for the CSi versions. The CSi versions are also different depending on country variant and further complicated by the availability of AHK in the Euro versions - goodness knows what all the differences are!
http://www.realoem.com/bmw/enUS/show...diagId=32_0287
http://www.realoem.com/bmw/enUS/show...diagId=32_0674
http://www.realoem.com/bmw/enUS/show...diagId=32_0287
http://www.realoem.com/bmw/enUS/show...diagId=32_0294
Last edited by Timm; 10-25-2018 at 03:19 PM.
Timm..2007 E64 650i Individual Sport..1999 E31 840ci Individual Sport..ex owner of 2000 E38 740..1999 E38 740i V8 M62..1998 E38 735i V8..1993 E32 730i V8..1988 E28 518i
My BMW Repair YouTube Channel
My Current 840ci Sport Individual
My Current 650ci Sport Individual
My E31 Repair and Information Website
My E38 Repair and Information Website
My E63/E64 Repair and Information Website
Chase - Heroes to a generation
Bookmarks