Vehicle pain

So I'm trying to make a bike script that's actually driveable. I've started with the "Improved Bike" script that it looks like was originally by Cory Linden.

I've read all the vehicle docs and wiki and experimented a lot with differnet values for all the parameters. I did get them at one point so that the bike was very controllable, but now it doesn't bank at all while turning. God knows why. The documentation for vehicles doesn't seem to make a lot of sense, at least to me. It's like I read the description of the effect a paramter should have and I change it and it either makes no difference or it has a completely unexpected effect.

I'm thinking that since vehicle physics is apparently a layer on top of the regular dynamics engine, would it be possible for the programmer responsible to document the formulas/algorithms implemented in this layer. At the moment I'm thinking maybe it would be easier to just set the vehicle as a physical object and write my own code in a timer event to simulate vehicle behaviour.

I've spent the last week trying to get my little head round vehicle parameters and I'm finding it really hard to make sense of. Theres the pdf guide to scripting languages and the on screen help files... are there any other help/ example guides that clarify?

Hey LittleSuzie! Was good meeting you yesterday. Do you know about the wiki and the scripting library ?

They are my bible!