Dutchy1978 wrote:
Thanks, that site will give me a fair bit of reading.
I found the explanation of why the roll axis (neutral roll axis) is inclined differently for front and rear wheel drive interesting, I can understand that roll provides the driver with feedback, and that you would probably want more feedback from the driven wheels so a greater roll moment at the driven end is desirable.
I've previously read about roll frequency, that is how quickly a suspension rolls, the explanation for a inclined roll axis was that the front is the first to experience the lateral acceleration and roll, the rear experiences it only after and because of the front.
If the roll moment was the same the front would roll then the back leading to a vague, delayed and weird feeling (technical term).
I believe I've felt this in my mini (which has a declining roll axis) on a short sharp corner it felt fine on a longer faster corner it felt like the rear wouldn't decide what it wanted to do, grip or step out. I partially solved it with progressive bump stops on the rear, I believe it was relatively quickly settling on the bump stop meaning the rear roll frequency better matched the front.
I've managed to try and sort the minis skewed roll axis by raising the rear roll axis, it's passed engineering but isn't registered yet so I've not much idea of it has improved things markedly.
With most of your weight centered it might be a safe bet for a relatively flat roll axis, I'm not sure it hasn't something to do with where most of the weight is as well as weight will generate roll.
Sorry long, stream of consciousness post...