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The BMW Range
3 Series
E46
My expensive journey with bumpsteer and a tribute to Albert Fang - WP Auto
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<blockquote data-quote="advocates" data-source="post: 607799" data-attributes="member: 2650"><p>Just an update. I checked my caster measurement and was surpised to discover the reading was as follows:-</p><p></p><p>Left 7.3 degree Right - 3.4 degree. </p><p></p><p>If I am not mistaken, the specified range should be 5.1 degree to 6.1 degree.</p><p></p><p>My trusted mechanic took a pair of original bmw control arm together with the control arm bush and installed it. The new reading is as follows:-</p><p></p><p>Left 5.4 degree Right 4.7 Degree</p><p></p><p>This was the reading even after having installed the control arm bush at the 290.9 mm location as recommended by BMW AG. The result is the bumpsteer was reduced by more than half. The left caster seems ok but somehow the right caster is still a bit off...trying to bring it within the specified range and hopefully, will solve the bumpsteer issue without having to use the hat bush in the rack.</p><p></p><p>The 290.9 mm between the location of the control arm bush and the centre of ball joint must be adhered to strictly. My mechanic and I notice that even a change of 1 mm will change the caster by 1 degree. So if any of you were to change the control arm bush next time, please ensure the mechanic knows how to install it properly.</p></blockquote><p></p>
[QUOTE="advocates, post: 607799, member: 2650"] Just an update. I checked my caster measurement and was surpised to discover the reading was as follows:- Left 7.3 degree Right - 3.4 degree. If I am not mistaken, the specified range should be 5.1 degree to 6.1 degree. My trusted mechanic took a pair of original bmw control arm together with the control arm bush and installed it. The new reading is as follows:- Left 5.4 degree Right 4.7 Degree This was the reading even after having installed the control arm bush at the 290.9 mm location as recommended by BMW AG. The result is the bumpsteer was reduced by more than half. The left caster seems ok but somehow the right caster is still a bit off...trying to bring it within the specified range and hopefully, will solve the bumpsteer issue without having to use the hat bush in the rack. The 290.9 mm between the location of the control arm bush and the centre of ball joint must be adhered to strictly. My mechanic and I notice that even a change of 1 mm will change the caster by 1 degree. So if any of you were to change the control arm bush next time, please ensure the mechanic knows how to install it properly. [/QUOTE]
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The BMW Range
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My expensive journey with bumpsteer and a tribute to Albert Fang - WP Auto
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