In reading various threads both in English and in translated German, it has yet to be fully explained why the three different options. I understand that with the 10 and 20mm it seems to promote better driveline alignment (at the guibo especially) but my concern is about the bump steer and screwed up suspension dimensions. Have any of you experienced this? Is there a remedy? I've also read that some have attempted to do the conversion without the spacer and that it isn't an issue with the E30 unlike in the E36 where it may not clear the steering rack.
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Velocity Motor Works
1972 2002
1983 533is
1987 325is (Roxanne)
1988 M6
1989 M3
1989 325ix (Darth Maul)
Gone: 1974 2002, 1984 318i , 1985 318i, 1988 325ix Sedan, 1988 325ix Coupe, 1991 318is, 1991 318i, 1994 525iT, 1995 325is, 1996 M3 Coupe, 1997 328is, 2001 325i, 2001 Z3 2.5i, 2001 330i, 2001 525iT, 2006 F-250 SD and more... -
Idk how bumpsteer has become what it is on this forum, but lowering the subframe won't cause the car to magically have more. What it effects is the roll center and it puts the control arms at a point on the camber curve that is even less desirable.
It is also supposedly better for the guibo, but I haven't done the measurements to say for sure. I can tell you that I ran mine with no spacers and my guibo lasted just as long as it did when I had an m30, I had no vibrations and an extra inch of ground clearance over spaced subframes.Byron
Leichtbau -
Well this is why I ask because I do not know.sigpic
Velocity Motor Works
1972 2002
1983 533is
1987 325is (Roxanne)
1988 M6
1989 M3
1989 325ix (Darth Maul)
Gone: 1974 2002, 1984 318i , 1985 318i, 1988 325ix Sedan, 1988 325ix Coupe, 1991 318is, 1991 318i, 1994 525iT, 1995 325is, 1996 M3 Coupe, 1997 328is, 2001 325i, 2001 Z3 2.5i, 2001 330i, 2001 525iT, 2006 F-250 SD and more...Comment
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I haven't noticed any real difference with or without spacers - have built one of each type.
In my opinion it's better to use spacers as then you have correctly aligned driveline, and the biggest advantage is that you can use E32 / E34 - type expansion tank bolted to firewall above the engine. There is no other option that would work as well and problem-free.- E34 M5 (x 2) -
- E30 V8 Cabrio "Kylpyamme" -
- Alpina D10 Touring #33/94 -
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- E46 318i Touring -
- Toyota Hiace 4wd -Comment
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Very good point Jonsku.
I was planning on using the Mishimoto aluminum expansion tank mounted remotely myself. My motor is out of a 740iL and I don't want to source or cut up a new acoustic cover. I like the "all-the-way-to-the-back look."
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Velocity Motor Works
1972 2002
1983 533is
1987 325is (Roxanne)
1988 M6
1989 M3
1989 325ix (Darth Maul)
Gone: 1974 2002, 1984 318i , 1985 318i, 1988 325ix Sedan, 1988 325ix Coupe, 1991 318is, 1991 318i, 1994 525iT, 1995 325is, 1996 M3 Coupe, 1997 328is, 2001 325i, 2001 Z3 2.5i, 2001 330i, 2001 525iT, 2006 F-250 SD and more...Comment
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As soon as my car is out of storage I will be pulling my subframe spacers. I am not a huge fan of how low everything sits now. I ave a coolant resevoir out of a w126 Mercedes so that won't be an issue for me. I will just have to remake my steering shaft.
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MarkComment
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I like MM's solution to the spacers. Turning the offset FCABs 90 degrees down.
I'm a big fan of proper driveline alignment, so I got the spacers. Plus, the more room the better under that hood.1974.5 Jensen Healey : 2003 330i/5Comment
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Can you elaborate on your solution slammin.e28guy? Who is MM?sigpic
Velocity Motor Works
1972 2002
1983 533is
1987 325is (Roxanne)
1988 M6
1989 M3
1989 325ix (Darth Maul)
Gone: 1974 2002, 1984 318i , 1985 318i, 1988 325ix Sedan, 1988 325ix Coupe, 1991 318is, 1991 318i, 1994 525iT, 1995 325is, 1996 M3 Coupe, 1997 328is, 2001 325i, 2001 Z3 2.5i, 2001 330i, 2001 525iT, 2006 F-250 SD and more...Comment
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1974.5 Jensen Healey : 2003 330i/5Comment
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Thanks!sigpic
Velocity Motor Works
1972 2002
1983 533is
1987 325is (Roxanne)
1988 M6
1989 M3
1989 325ix (Darth Maul)
Gone: 1974 2002, 1984 318i , 1985 318i, 1988 325ix Sedan, 1988 325ix Coupe, 1991 318is, 1991 318i, 1994 525iT, 1995 325is, 1996 M3 Coupe, 1997 328is, 2001 325i, 2001 Z3 2.5i, 2001 330i, 2001 525iT, 2006 F-250 SD and more...Comment
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Angle of the driveline is the most important, suspension can be sorted from there. I am running 20mm spacers and 20mm RCS as well to correct the control arm geometry and have had no suspension issues. With roll center spacers you will need to run at least 16" rims.Last edited by fronton; 03-25-2013, 04:09 AM.
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The steering rack mount and lower control arm pivot (ball joint) are both on the front subframe. Moving the subframe does not change their relationship to each other.
Anti dive would be slightly affected because the rear control arm pivot stays fixed, but any meaningful amount of bumpsteer has not been introduced.Lorin
Originally posted by slammin.e28Comment
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