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M3 Track: Racing and DE Best mod for speed is learning to get the most out of what you currently have. Tracks and DE's is the place to start!


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Old Thu, Dec-31-2009, 04:45:06 PM   #1
backitoff
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Default Steering rack swap / ratio upgrade

Hi Guys new to the forum so a BIG hello!
I'm looking for some technical advice relating to replacing my steering rack as i'm not happy with the vague feel to the steering on my E46 M3. Nothings bent or worn its just a characteristic, and it's just not direct enough IMO.

Been looking at fitting a different ratio rack from another BMW. This seems to be quite common on E30's and E36's and from what I can make out the rack from a 1.9ltr Z3 is a great conversion for E36's, so i'm hoping that it will fit the E46???
Any info or links to this type of conversion would be a great help.

For reference I have found out the following:
E46 M3 rack ratio is: 15.4.1
M3CSL rack ratio is: 14.5.1
STD E46 rack ratio is: 13.7.1

Not sure on Z3 1.9 ratio??

Any help or advice would be appreciated.
Cheers!!
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Old Thu, Dec-31-2009, 09:51:32 PM   #2
jrf m3
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a board member had this done at a shoppe in abbotsford british columbia - miller performance

www.millerperformancecars.com

try them for the info about which rack etc.

his user name was lalexander (i think)
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Old Thu, Dec-31-2009, 11:33:26 PM   #3
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i don't know the actual steering ratio, but

92-98 E36 3.2 Turn to Lock Ratio Rack
92-98 E36 3.2 Turn to Lock Ratio Rack
95 E36 M3 3.0 Turn to Lock Ratio Rack
95-97 E36 Z3 1.9L 2.7 Turn to Lock Ratio

i would think that e46 m3 steering rack already has quicker ratio than previous generations. it's a huge difference driving an e30 m3 steering rack to e46 m3
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Old Fri, Jan-01-2010, 05:59:38 PM   #4
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the e46 ZHP steering rack is a popular swap
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Old Fri, Jan-01-2010, 07:10:17 PM   #5
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i agree the E46 M3 rack is much faster than the E36 M3 rack, however, i think it is still slower than i'd like (for autoX) but maybe only a little slower than i'd like for track.

i've driven an Evo9 and its rack is twitch-turn fast.
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Old Fri, Jan-01-2010, 10:11:16 PM   #6
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Quote:
Originally Posted by mastek View Post
the e46 ZHP steering rack is a popular swap
All 330's have the same steering rack (13.7:1), ZHP or otherwise.

The M3 ZCP does have a slightly faster ratio (14.5:1, versus 15.4:1) but IMO it isn't much of a difference to make a swap worthwhile.
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Old Mon, Jan-04-2010, 08:35:02 AM   #7
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Z4M Coupe 12.8:1
Z4M Roadster 13.7:1
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Old Wed, Jan-06-2010, 03:33:06 AM   #8
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Quote:
Originally Posted by GP20 View Post
Z4M Coupe 12.8:1
Z4M Roadster 13.7:1
that's what I'm talkin about.
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Old Thu, Mar-11-2010, 01:07:26 PM   #9
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Quote:
Originally Posted by GP20 View Post
Z4M Coupe 12.8:1
Z4M Roadster 13.7:1
Would those 2 fit a e46m without any problems?
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Old Sat, Mar-13-2010, 12:10:19 AM   #10
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+ 1

Would definietly like to know if Z4M Coupe 12.8:1 rack will work. Thats perfect for auto-x...
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Discussing Steering rack swap / ratio upgrade in the M3 Track: Racing and DE Forum - Best mod for speed is learning to get the most out of what you currently have. Tracks and DE's is the place to start! at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)