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  #21  
Old 23-06-2011, 09:23 AM
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Interesting, you can imagine that raising the subframe up especially if you've lowered the car will reverse some of the extra camber/toe. The only issues as said is the angle of the propshaft but this should have enough give in the joint, the rear diff bush does definitely, so it would all raise up together.

It's a shame the diff's mounted on the subframe otherwise you could play about with this easier (also clearance from the boot floor isn't that great above the diff at it's highest point).

I don't imagine it would affect the ride height much/at all, the angle of the trailing arm where the spring sits is moving all the time anyway, it may just re-angle it slightly but not enough to change the ride height noticeably IMO.
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  #22  
Old 23-06-2011, 09:29 AM
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Quote:
Originally Posted by c_w View Post
It's a shame the diff's mounted on the subframe otherwise you could play about with this easier (also clearance from the boot floor isn't that great above the diff at it's highest point).
Also the Diff is mounted to the subframe AND also the "ear" which is attached to the body, so you'd have to modify that too. On a racecar you could cut through the boot floor and make a much stronger and height adjustable bracket to attach the diff.
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  #23  
Old 23-06-2011, 11:19 AM
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http://www.e30m3project.com/e30m3per...m_pickup-1.jpg

In this picture you can see how the DTM version had the roll adjustment. They had subframe bolted into body and the trailinarm could be moved up and down. Also the toe and camber were adjustable by separate adjustments. Moving the subframe does the same roll adjustment. It does change ride height a bit, but cause of the roll adjustment is +/- aprox 3mm maximum, the ride height changes propably cannot even be measured. Ride height changes cause the spring perch angle changes slightly twisting the spring a bit. This isnt significant change. Also the diff mounting is so flexible it dont need anything done. Shaft angles dont change either too much. But, I dont suggest anybody to do such adjustment, except if theyr racing and are lookinf for the last tenth of the second. To clubracers its easier to change toe or rear ride height to make car understeer/oversteer as wanted. For serious racers this is one important place to make adjustments. Forexample, you can choose the cars ride height as you want, then adjust the roll axis to make the car handle as you wish, along with the other adjustments.
http://www.131abarth.com/bmw_325.htm some pics of our racer. Going to 24 hours race in three weeks, should make some slight maintenance to make it do the whole race! We won it last year.
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  #24  
Old 23-06-2011, 12:20 PM
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Quote:
Originally Posted by exdos View Post
Also the Diff is mounted to the subframe AND also the "ear" which is attached to the body, so you'd have to modify that too. On a racecar you could cut through the boot floor and make a much stronger and height adjustable bracket to attach the diff.
As said I reckon the diff ear would have enough give if the subframe is raised 10mm. The subframe probably moves more than that in normal use anyway on the standard front bushes!

Looks like the E30 race setup was quite different though.
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  #25  
Old 23-06-2011, 12:30 PM
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Quote:
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Looks like the E30 race setup was quite different though.
Very little like the OEM set-up. With many of these racecars there's barely any similarity to the production car to which they are supposed to be.
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  #26  
Old 07-02-2012, 03:23 PM
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found this picture on a old thread of the spacer fitted,

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  #27  
Old 07-02-2012, 03:29 PM
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Dave,

Thanks for that, I'll put that in a current thread on the zroadster forum.
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