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Discussion Starter · #1 · (Edited)
From all the research I (and all of you) have done, appears the ZHP rack has the same ratio as other 330s, but may have a unique part number. I came across an interesting factoid while doing this research - all photos of racks on actual ZHPs, depict an identical (differing manufacture dates) yellow tag, listing ZF part number. Again, perhaps coincidental, but I have come across 5 actual photos (enclosed) and they all have the same tag. Further, the production dates of these 5 racks range from 10/03 to 05/05, so appears there may have been some consistency using this specific rack across the years. I have also seen standard 330i tags and they have different ZF numbers.

So... just thought I would share. I ended up finding one of these on Ebay - and there is another out there as well.
 

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FYI. ZF produces all of the E46 gears. There are 4 different variations on the gear. Start of production to 06/00 is the first revision of the 323-330 gear, there is an updated part number for racks from 06/00. There is another gear which works with e46 compact. Finally there is a gear for the M3.

I'm not sure what was updated on the gear for the 330 in 06/00 (I believe that was the date). I can find out if you guys are curious.....
 

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Discussion Starter · #3 ·
FYI. ZF produces all of the E46 gears. There are 4 different variations on the gear. Start of production to 06/00 is the first revision of the 323-330 gear, there is an updated part number for racks from 06/00. There is another gear which works with e46 compact. Finally there is a gear for the M3.

I'm not sure what was updated on the gear for the 330 in 06/00 (I believe that was the date). I can find out if you guys are curious.....
roger -
the point I am trying to make is thus far, there seems to be a consistent part number (via yellow tag) for those racks actually currently in a ZHP. This part number IS different from other 330s.

As noted below, the typical part number for an -01 and up 330i rack is 32136757651; however, the racks I have photographed reflect a "6757 650" extension" not -651. Thus, a different rack. To clarify, I have enclosed a pic of a typical 330 rack, ending in '651.

4/1999 to 4/2001 used part# 32136753438
3/2001 to 4/2001 used part# 32132282296 (in the M sports package II only)
4/2001 to 9/2001 used part# 32136755065
9/2001 to present used part# 32136757651
 

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Here is a mystery. My '01 330Ci with production date 12/2000 has this rack: 32136753438 (see attached pic)

Car was not built until 12/2000 but yet it has a rack wit ha 5/2001 date? :hmm:

It appears to be a 3.2 turns for lock to lock. I would have to assume it is a 13.7:1.

Check this out: http://forum.e46fanatics.com/showpost.php?p=9803842&postcount=4

Looking through RealOEM, BMW apparently couldn't make up their mind with steering racks.

323
up to 9/1998 used part# 32131096283
9/1998 to 4/1999 used part# 32131097315
4/1999 to 4/2001 used part# 32136753438

328
up to 9/1998 used part# 32131096283
9/1998 to 4/1999 used part# 32131097315
4/1999 to 4/2001 used part# 32136753438

325
4/1999 to 9/2001 used part# 32136753438
11/2000 to 9/2001 used part# 32131097316 (in the M sports package II only)
9/2001 to present used part# 32136755065

330
4/1999 to 4/2001 used part# 32136753438
3/2001 to 4/2001 used part# 32132282296 (in the M sports package II only)
4/2001 to 9/2001 used part# 32136755065
9/2001 to present used part# 32136757651

M3
all production dates used part# 32132229397

M3 Competition Package
12/2004 to present used part# 32132282642

M3 CSL
all production dates used part# 32132282642
More info on racks here:
http://forum.e46fanatics.com/showthread.php?t=667263

and

http://forum.e46fanatics.com/showthread.php?t=405802
 

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Discussion Starter · #10 · (Edited)
I was always under the impression that ZHPs come with a more aggressive steering ratio than regular 330's.
the ZHP was sold using marketing material stating they had a quick 13.7 ratio. as is turns out, all 330i ('01 +) have a 13.7 ratio as well. the question has always been - is there a unique rack in the ZHP? what is unique about it? and what is the part #?

from my documented research above, the 5 examples of racks IN ZHPs all contain the same ZF part number, ending in -650. the racks from a normal 330 end in -651 (or other depending on the year).

even though the ratio may ostensibly be the same, I am now a believer that the -650 rack is, in fact, specific to the ZHP. I have found evidence this rack was used from 03 to 05, which coincides with the ZHP offering. it is possible the rack may have tighter tolerances, upgraded internals, or other performance characteristics separating it from the standard 330 rack. there are many examples in the high-performance car world where "normal" components were further refined/modified and then were assigned a unique part number - at times deeply hidden within the bowels of the manufacturing documentation (Chevy is notorious for this)

I have read a case of a ZHP owner taking his car in for a leaking rack under warranty, only to have a -651 rack installed in lieu of the -650 that was removed. This tells me the -650 racks are not readily available by the dealer for replacement. I suspect the dealer just chose to pull a rack of the shelf. Strangely, I've not been able to find this part number in any parts list, further raising the mystique about this rack.

so... I am just presenting the data I found - and, I am of the opinion this is the unique rack.

I welcome any other ZHP owners to provide data of the tag for comparison.
 

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More aggressive than even the M3. I think the numbers are as follows:

ZHP Ratio = 13.7:1
M3 Ratio: 15.4:1
Reg 330: ~16:1
Where did you get those numbers? From all research I've done, the normal M3 has a higher ratio than the non-Ms to make up for the extra caster angle M3s have.

If you don't already know, a higher caster angle makes the steering wheel more self centering and harder to turn, the further turned from straight ahead.
 

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Discussion Starter · #12 ·
Where did you get those numbers? From all research I've done, the normal M3 has a higher ratio than the non-Ms to make up for the extra caster angle M3s have.

If you don't already know, a higher caster angle makes the steering wheel more self centering and harder to turn, the further turned from straight ahead.
This is what I located:

Steering ratio:
ZHP/330 has the steering ratio of 13.7:1
M3 is 15.4:1
M3 Competition 14.5:1.
 

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I thought it was the ZCP M3s that had the quicker rack and the ZHPs had an upgraded suspension (dampers, springs, and control arms) with a lot of Meyle HD bushings, some alcantara, cams and some software.
 

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just bumping this since I just picked up a zhp rack..






apparently this number is the same on the z4m roadster(NOT the coupe since it apparently has a faster 12.8 ratio)
but this number is different on late model e46 330i's racks...
hrmmmm





I dont have a regular late model e46 330 rack for comparison though.
 

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^Rack body number is not necessarily indicative that rack internals are the same. It just means they may not have needed to re-engineer another one body to house the internals of the rack. :idea: Unless a dissection is done from both racks or someone who worked on these while at ZF-Lenksysteme GmbH, there is still no 100% definitive answer. :tsk: Alternatively, we need a couple professional drivers in a double blind driving study to help us determine if a car with and without a ZHP rack is actually faster with all other variables being equal (like year, model, and power steering pump). This driver must NOT be given knowledge about different racks. Pick your poison and roll with it. Otherwise, it will always be the hype of those thinking their ZHPs are better than the rest. :rolleyes:
 

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LOL very true.
I personally dont think the ratio is different...but there maybe be some other internal differences. All just speculation. unless someone wants to take the time to disect both. we will never know for sure.
 

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will a '04 330i ZHP rack fit/work in my 1999 328i (e46)
 
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