ur-quattro differences (continued)

[Dave Eaton <Dave.Eaton@clear.net.nz>]

after the recent debate about the effects of upsizing wheels and tyres on 
an ur-quattro, there was some debate about the chassis changes between the 
wr, mb and rr-series ur-quattro chassis.

i've done some digging about this issue and come up with the following.  my 
main sources are the autocar road tests which contain full dimensional 
information, cross-checked with my owners manual (for the rr)

anyway, suffice to say that there were dimensional changes between the 
early wr (series 1) and the last wr (series 2) cars.  to recap, the early 
cars had the 205/60 15 tyres on 6x15 et45 wheels, the series 2 cars had 
8x15 wheels with an et24 offset.  as stated in my previous emails, there 
were a number of changes to the suspension by way of new wishbones, ball 
joints and the deletion of the rear anti-roll bar between the series 1 and 
2 models.  the major differences of course were the changes in wheels from 
the 6x15" to the 8x15 with 215/50 15 tyres.  there were no changes to the 
caster, camber and toe between the models.

below is detailed the dimensional differences between the models (in mm), 
series 1 wr 1st and series 2-4 wr, mb and rr last.

wheel base	2524	2524
front track	1421	1461	(+40mm)
rear track	1458	1494	(+36mm)
ground cl	165	153	(-12mm)
length    	4404	4404
width     	1723	1723
weight   	1291kg	1395kg

in summary therefore, it is clear that there was a change in track which 
occurred with the wishbone/balljoint replacement which occurred at the end 
of the '82 model year for the '83 year.  this was at the end of 
85-c-902-000, and the start of 85-d-900-001. in summary at the front,  the 
changes involved new lower wishbone, ball joint, and new shock absorbers 
and anti-roll bar (along with their rubber mountings). there was a change 
in front springs at 85-e-900-324 (nov '83, during the '84 model year). at 
the rear the anti-roll bar was deleted and a new wishbones specified, tie 
rod, and the ball joints.  the rear strut also changed for the '83 model 
year, along with the rear shocks changed and the coil springs.

if i've worked it out correctly, the hub-to-hub measurement of the series 1 
front is (1421-45-45) 1331mm while for the series 2 it is (1461-24-24) 
1413mm.  that's a change of 82mm.  at the rear it works out to 1368 (series 
1) and 1446mm (series 2), for a difference of 78mm.

dave
'95 rs2
'90 ur-q