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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 10-02-2012, 10:59 AM   #141
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Quote:
Originally Posted by zhp43867 View Post
Oh lord. From now on anyone who gets anything zhp should just say, "I got a steering rack from it-which-cannot-be-named. Combined with a steering wheel from it-which-cannot-be-named and control arms from it-which-cannot-be-named I have changed the entire steering experience!"

And SeanC has had a zhp and non-zhp so Alex, Mango, and everyone else is out to lunch. You will not change his mind, and you shouldn't, because he has owned both and none of you others have. You just endlessly research part numbers and ETK diagrams. I too have owned both as well and concur with Sean's statements.
my friend is shop foreman at a bmw dealer here in socal and i asked him about this yesterday. he laughed pretty good when i told him people were saying their zhp rack is different
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Old 10-02-2012, 11:03 AM   #142
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I think it's interesting that people want the quickest rack they can find... but wouldn't that make high-speed steering response annoying and twitchy? Z4 is a short wheelbase car meant for track duty. 3-series (M3 included) are longer wheel base and probably geared for high speed stability (what's the toe-in on the M3?) all I'm saying is careful what you wish for. I know on the S2000s (Ap1 I think) people complained about the steering being too twitchy at speed so they put a more "tame" rack in for later models. Just what I had read
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Old 10-02-2012, 12:01 PM   #143
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They addressed this in the m3.
The lock to lock is the same as the 330 but the gearing is dynamic. So it's slower in the middle and quicker while turning hard.
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Old 10-02-2012, 03:54 PM   #144
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They addressed this in the m3.
The lock to lock is the same as the 330 but the gearing is dynamic. So it's slower in the middle and quicker while turning hard.
Most BMW racks are this way actually, and they have been for decades.
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Old 10-02-2012, 11:07 PM   #145
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They addressed this in the m3.
The lock to lock is the same as the 330 but the gearing is dynamic. So it's slower in the middle and quicker while turning hard.
I'll have to check when I'm in my car next, but I'm fairly sure the M3 requires more turns lock to lock.
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Old 10-02-2012, 11:13 PM   #146
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I'll have to check when I'm in my car next, but I'm fairly sure the M3 requires more turns lock to lock.
maybe i misremembered that part. but i know the m3 rack is dynamic.
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Old 10-02-2012, 11:17 PM   #147
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maybe i misremembered that part. but i know the m3 rack is dynamic.
I think what's unique to the M3 is speed-sensitive variable assist power steering. I'm not sure if the steering rack has anything to do with that though

Edit: Actually you may be right. From my research, in the e36 days, the steering ratios were linear on non-Ms and progressive on Ms. Not sure whether or not that carried over to the e46
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Old 10-02-2012, 11:24 PM   #148
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I thought the standard E46 was variable-assist power steering as well? That's what I remember reading in the manual. I feel like the M3 has to have something special about its steering rack if the 330 has a quicker ratio than it.
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Old 10-02-2012, 11:27 PM   #149
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I thought the standard E46 was variable-assist power steering as well? That's what I remember reading in the manual. I feel like the M3 has to have something special about its steering rack if the 330 has a quicker ratio than it.
I think it has to do with the M3s different suspension geometry. I don't know if you've driven one, but the steering feels quite a bit stiffer than even a ZHP despite the taller steering ratio. BMW might have decided that a 13.7 would require too much effort
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Old 10-02-2012, 11:40 PM   #150
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Got it. That would make a lot of sense. Sometimes I forget that it's an entirely different car underneath the skin. I've never driven one, always wanted to
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Old 10-03-2012, 12:08 AM   #151
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Edit: Actually you may be right. From my research, in the e36 days, the steering ratios were linear on non-Ms and progressive on Ms. Not sure whether or not that carried over to the e46
Actually, E36 M and non-M racks are identical excepting the '95 M3, and all E36 racks are progressive. You are thinking of Z3s--the Z3 non-M rack is the linear (non-progressive) one, whereas the MZ3 racks are progressive/variable rate.
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Old 10-03-2012, 12:12 AM   #152
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Actually, E36 M and non-M racks are identical excepting the '95 M3, and all E36 racks are progressive. You are thinking of Z3s--the Z3 non-M rack is the linear (non-progressive) one, whereas the MZ3 racks are progressive/variable rate.
Yeah I just saw that after looking up the part numbers. Is there any particular reason BMW stuck a linear rack on the non-M Z3s? And do we know for sure whether or not the E46 racks are linear?


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should post a pic of your E30.
Maybe after cleaning it up a bit . The car's definitely a little rough - but you can't expect too much for $1500. One thing that kinda sucks though is that at some point the engine was replaced, and it seems they "accidentally" put an eta engine in there instead of the normal i engine. But my buddy and I picked up an M20 from a junkyard... We intend to clean it up, stroke it to 2.7 or 2.8, and then swap the new engine in when we have time.
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Old 10-03-2012, 05:44 PM   #153
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The M3 employs essentially the same steering mechanism as the E46 3 Series: rack-and-pinion, with engine-speed-sensitive variable power assist.
Its overall ratio is 15.4:1, just slightly “quicker” than the 15.5:1 of regular (early) 3 Series models.
The power assist is calibrated for extra-firm road feel, and steering return action is enhanced by the increased caster.
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Old 10-03-2012, 11:46 PM   #154
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The M3 employs essentially the same steering mechanism as the E46 3 Series: rack-and-pinion, with engine-speed-sensitive variable power assist.
Its overall ratio is 15.4:1, just slightly “quicker” than the 15.5:1 of regular (early) 3 Series models.
The power assist is calibrated for extra-firm road feel, and steering return action is enhanced by the increased caster.
That's that then. I could have sworn I read somewhere that something was different, but I was probably also confusing that with the Z3/Z3M.
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Old 10-07-2012, 10:37 PM   #155
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1st picture (dirty rack) 2005 ZHP. 2nd picture (wiped off with a wet rag) my 2002 330i rack.



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Old 10-07-2012, 10:39 PM   #156
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Oh hey look, they're the exact same part - just as RealOEM and everyone else stated. What a shocker.
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Old 10-07-2012, 10:51 PM   #157
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^Yep. I was only doing what I was asked to do. Had both cars on a lift today. Perfect =)
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Old 10-07-2012, 10:53 PM   #158
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By the way, this particular ZHP had its control arms fail at 38,000 miles. Replaced under CPO
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Old 10-07-2012, 10:55 PM   #159
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^Yep. I was only doing what I was asked to do. Had both cars on a lift today. Perfect =)
Oh I know. I just don't know what else can possibly convince the naysayers.
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Old 10-08-2012, 12:47 AM   #160
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Oh I know. I just don't know what else can possibly convince the naysayers.
i gotcha

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