Thanks Mark.. Since reading your post I have read some things online (to remind myself of my GCSE physics) and of course spring rate isn't impacted by preload it makes sense now I think about it, please excuse my stupidity.
So now I have demonstrated I'm a fool anyone got any other thoughts on improving rear end grip? I have already shifted the shocks to the back of the wishbones, I have a Trishbits brass weight coming (thanks to the for sale section), I am looking at softer springs and I have read the idea of running a the smallest possible spur gear and a bigger pinion to shift the motor back. I am sure that running Saddles would would help but I have several good quality stick packs and I'm reluctant to spend a fortune on MORE new batteries. The car has the +8mm chassis fitted and I have the rear wing set at the maximum angle of attack. I am running Bowties on the rear and proline ribs on the front with soft inserts.
I am trying to get my head around roll centres and when I can work this out I might try playing with that too.
To give some detail the track is very low grip loose dirt with a few small jumps. I am finding the back steps out on me as I turn in under braking and as soon as I try and get on the power as I leave the turn. I guess the issue under braking is more my skill/technique than the car but I was definatley having to wait longer than others to get on the power.
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