Has anyone installed the MRT Bump Steer/Roll Center Correction with an E46 rack or Z3 rack? If so how does it feel on the street? Is it twitchy on the highway/interstate?
I am looking to correct my bump steer and roll center from lowering my car, but do not care for the 30% increase in steering angle/shortening of the steering ratio. I know they have a kit where it does not increase the steering angle/ratio, but I do not want to install heim joints on a primarily street driven car.
From looking online it looks like the following cars have the following steering ratios:
E30 Rack = 20.5:1
95 E36 M3 Rack = 17.6:1
E36/Z3M Rack = 15.6:1
E46 M3 Rack = 15.4:1
E46 M3 CSL/ZCP Rack = 14.5:1
Z3 non M Rack = 13.9:1
E46 rack = 13.7:1
I know these steering ratios are dependent on the steering knuckle geometry for the front spindle, so I found some other specs on rotations and mm of rack travel.
Rack..................mm/rev.............lock-to-lock.....Travel (mm).... new mm/rev...... new travel(mm)
E30 (stock)..........36mm....................3.9...... .......140.4 .............. 46.8................182.5
E30 M3................38mm....................3.5..... ........133.0 .............. 49.4................172.9
E36 M3 (1995)......46mm....................3.25.......... 149.5 .............. 59.8................194.4
E36/7 Z3..............48mm....................2.7....... ......129.6 .............. 62.4................168.5
Z3 1.9L................53.5mm..................2.7... .... ....144.5.............. 69.6................187.9
E46.......................50mm...................3 ................150 ................ 65................195
E46 M3.................47mm..................3.2...... .........150 .............. 61.1..............195
E46 M3 ZCP.........50mm...................3.............. ....150.............. 65..................195
Z4M......................50mm..................2.8 ................140.............. 65..................182
I am looking to correct my bump steer and roll center from lowering my car, but do not care for the 30% increase in steering angle/shortening of the steering ratio. I know they have a kit where it does not increase the steering angle/ratio, but I do not want to install heim joints on a primarily street driven car.
From looking online it looks like the following cars have the following steering ratios:
E30 Rack = 20.5:1
95 E36 M3 Rack = 17.6:1
E36/Z3M Rack = 15.6:1
E46 M3 Rack = 15.4:1
E46 M3 CSL/ZCP Rack = 14.5:1
Z3 non M Rack = 13.9:1
E46 rack = 13.7:1
I know these steering ratios are dependent on the steering knuckle geometry for the front spindle, so I found some other specs on rotations and mm of rack travel.
Rack..................mm/rev.............lock-to-lock.....Travel (mm).... new mm/rev...... new travel(mm)
E30 (stock)..........36mm....................3.9...... .......140.4 .............. 46.8................182.5
E30 M3................38mm....................3.5..... ........133.0 .............. 49.4................172.9
E36 M3 (1995)......46mm....................3.25.......... 149.5 .............. 59.8................194.4
E36/7 Z3..............48mm....................2.7....... ......129.6 .............. 62.4................168.5
Z3 1.9L................53.5mm..................2.7... .... ....144.5.............. 69.6................187.9
E46.......................50mm...................3 ................150 ................ 65................195
E46 M3.................47mm..................3.2...... .........150 .............. 61.1..............195
E46 M3 ZCP.........50mm...................3.............. ....150.............. 65..................195
Z4M......................50mm..................2.8 ................140.............. 65..................182
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