Jhonno

Right been trying to think it through.. Indeed, that pic above, it looks wrong, but evidently isn't So you are saying, as long as the geometry gains remain suitable for the new lowered suspension travel range, there is no need to worry about roll centres?

Rather than try and explain the pics do the talking.. http://en.wikipedia.org/wiki/Trailing_arm

Blimey your my worst nightmare in the "modify/ consequence" department..... I feel you have gone a little to deep in the need to understand the chassis, your kind of looking at the design stage whereas you should be looking at the "calibration stage". We could pants on for days about roll centres/ couples/ transitions and dynamics when all we actually need is an image -V- solution. Well I have too much time on my hands at the minute, so unfortunately the thought processes gather momentum So you are saying, throw it all together then tweak it? Put in a crude way.. How will it be evident if the roll centre would need fiddling then? Or am I still missing the mark?

Well I am trying to understand the concept and apply it to my car as I am in the process of spending a fair amount of time and energy on the chassis, and looking to get it right (coilovers, adjustable front and rear toe, caster and camber) E30 is trailing rear arm like Z3's, or is it semi trailing, I should know this I know the camber increases as you lower the rear.. I think with the front macpherson setup, there is limited camber gain however.. You are relatively local to me, so I shall try and set it up enough to drive it down to you guys for a full setup I think, inc rolling of arches and balancing of wheels (I think my fronts have been done badly.. Not helped by having to run spacers to clear brakes currently)

So continuing to talk to myself, a Mac strut uses the top mount upper arm?

Could well be being a little special.. The above diagram is an A arm setup, as opposed to the Mac strut of the e30.. Have to find a diagram of how it works with the e30 setup

Very interesting post.. Came up on a google search. Was it you who posted on the e36coupe forum the other day? Just trying to clarify a few things.. By raising the roll centre or lowering the centre of gravity, would you be trying to get them to be at the same point? What are the negative effects of raising the roll centre? I run an BMW e30, which sits pretty low, and see people offering kits to raise the front roll centre.. So having read this, I am confused as to why now.. Is it to try and match the front and rear roll centres? I'm sure I have other questions, but I'll start there