stevemersey Posted April 30, 2012 Share Posted April 30, 2012 An update on my original comment. I had put 9mm (2 x shims) under my rack, after some preliminary estimates but have now reduced this to 4.5 after some further measuring using a laser. (1991 S3) This seems to give a better result over a wider range of travel. Link to comment Share on other sites More sharing options...
OliverSedlacek Posted April 30, 2012 Share Posted April 30, 2012 It varies, I've found optimums at 6mm, 2mm and 1.5mm. Link to comment Share on other sites More sharing options...
irrotational Posted April 30, 2012 Share Posted April 30, 2012 Thanks Paul - will have a look next time I have my head down there Link to comment Share on other sites More sharing options...
EFA Posted April 30, 2012 Share Posted April 30, 2012 Eugene, Why would ride height have any effect on bump steer? I think you meant to say parallel to the lower wishbone, but that would only be true if the wishbones were equal length, which means no camber on roll. It is a very complicated subject. Link to comment Share on other sites More sharing options...
stevemersey Posted May 1, 2012 Share Posted May 1, 2012 I found this here useful for visualising the arc the hub was taking and the consequent camber change before I started with bump steer. Link to comment Share on other sites More sharing options...
AMMO Posted May 1, 2012 Share Posted May 1, 2012 On my 1989 chassis with the old type steering rack I had to lower the rack considerably. Before it was toeing out something ridiculous on bump. Over 2 degrees from memory. I lowered the rack almost as far as it would go by milling down the brackets. It now has a tiny amount of toe out on bump. Link to comment Share on other sites More sharing options...
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