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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Fri, Jul-13-2018, 01:42:38 AM   #21
Volke
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Default Re: MK20 ABS unit differences

Quote:
Originally Posted by terraphantm View Post
I don't know if my measurements were accurate enough to say for sure whether or not the ZHP rack is 49mm vs 50mm or M3 rack 46mm vs 47mm. I also never had a ZCP rack on hand, I can't confirm or deny whether there's a measurable difference there.

Edit: In this post (which I believe was closer to when I actually changed steering racks and did the measurements), I said the M3 was ~46.5 mm/rev. http://www.m3forum.net/m3forum/showp...0&postcount=13
Are you absolutely sure the ZHP rack is progressive? I assume it's a yellow tag 712?

My 330 rack measurements definitely said 50mm/rev at center, it had exactly 3 turns lock to lock and 150mm total travel which makes it 100% linear. I don't think mine is a 712 though. I'll crawl under the car when I get it back from the cage fabricator next week. If your rack is 50mm/rev at center and gets faster, it would also be less that 3 turns lock to lock.

EDIT: Let's postpone this discussion for now. I'll start a thread later to document stuff in one place after I have my M3 rack on hand and my car back so I can get my 330 rack part number.
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Last edited by Volke; Fri, Jul-13-2018 at 01:51:52 AM.
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Old Fri, Jul-13-2018, 01:46:22 AM   #22
terraphantm
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Default Re: MK20 ABS unit differences

Mine takes about 2.75 turns lock to lock if I recall correctly.

Edit: This non-ZHP also seems to be about the same L2L. An 04 non-ZHP and ZHP should have the same rack

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Old Fri, Jul-13-2018, 01:55:36 AM   #23
Volke
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Default Re: MK20 ABS unit differences

Interesting. Yeah, I'll definitely get a thread started later to get everything sorted and documented in one place. It would be nice to have a definitive guide to rack swaps.
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Old Sat, Aug-04-2018, 02:38:37 PM   #24
Volke
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Default Re: MK20 ABS unit differences

Update: I got a chance to measure my E46 M3 rack. It is without a doubt 100% linear and has a rate of 47mm/rev.

Also, based on a picture of a ZCP/CSL rack turned all the way to the left that a friend shared, that appears to be linear too. Using the 47mm/rev of my rack and the published 15.4:1 and 14.5:1 ratios of the M3 and ZCP respectively, we can calculate the ZCP rack to be 50mm/rev. This is the same as the 330 rack on my car. Unfortunately, I can't say what 330 rack part number I have since I bought a BMW reman part and they seem to have removed the original ID tag.

Still planning on starting a separate thread to document all this when I have a chance to do a write up on how to measure the racks and what to look for.

EDIT: Someone measured and confirmed the ZCP rack to be 50mm/rev for me

EDIT 2: The M3/ZCP knuckle has a 130mm leverage arm on steering inputs. The fact that a 50mm/rev rack on the ZCP gives 14.5:1 ratio, and a 50mm/rev rack on a 330 gives 13.7:1 means that the 330 knuckles must have a shorter leverage arm. It should be ~123mm, but there may be some slight rounding errors in the 13.7 and 14.5 numbers.
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Last edited by Volke; Sat, Aug-04-2018 at 02:48:12 PM.
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Discussing MK20 ABS unit differences in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)