Rear Camber affecting ride over bumps - IS200 wheel alignment Q's

[mattysshop]

Hi all,

I have a fair bit of camber on the rear of the IS200 (lowered just with ordinary king lows)

Previously I had a Mitsu verada, which when I lowered it had excessive camber on the rear, which I fixed by simply spacing the top control arm outwards, with longer bolts etc, still had camber, but made a significant difference…

Tyres Wear is not really my concern but the horrible nervous feeling the car gets when you drive over a small bump, or man hole cover etc makes me very uncomfortable… it seriously feels like the rear end wobbles around 2 inches… the slight camber decrease those spacers made in the verada made a heap of difference… but i'm not sure this is the problem... it almost feels like bump steer from control arm angle/geometry... possibly excessive Toe in?

What my question is – this not affect nissans nearly as much, Do they do something different with their wheel alighnment or something?? I have driven/drifted heaps of nissans that simply do not have this problem.. yet they share very very similar rear subframe/cradle setups..

I know there are camber kits (offset bushes), and even adjustable upper arms available for them to straighten out the camber… but Is there something else I’m missing? Something that can be done to stop or reduce the effect of the rear end doing the Kansas city shuffle??

[mullett]

Not hitting the bumpstops?

[thechuckster]

what toe-in does the rear have when it's lowered?

[mattysshop]

not hitting bump stops, it's only normal king lows, there like 45mm lower than stock if that! i'm talking when the car bumps a cats eye reflector on the road... the rear end 'wobbles'...

not really on full suspension travel... there is plenty left before the bump stops


chuck - not sure on the exact amount, but i'm thinking that lots of toe in would be causing this... i'll get it on the rack and have a look, see if were able to correct some of it if any

[thechuckster]

being double-wishbone, I think there are other things afoot tho excessive toe-in won't help at all. Might also pay to inspect the joints on the rear sway bar links.

Not being a GT4, I can only suggest that excessive toe-in combined with minimal castor will make it bump steer (obviously more so on the front). And, for daily use, I think the GT4s run close to zero toe-in on the rear.