sikyne wrote:
Hi Tom, Id love some feedback on setup, as I feel i've lost my way a bit.

The car used to be fairly softly sprung. over the years ive been adding spring rate to the front and rear. I added another leaf to the rear pack just before the weekend and presumed i'd have to go up a bit at the front to get the balance back.

I arrived at the track with a Rear setup of 250Lb leafs, 3mm toe in and 1deg neg camber. I didn't have a rear anti roll bar.
Front end had 350Lb springs, 120Y anti roll bar, 1.5mm toe in and about 4.5 neg camber. The rear roll center was set about 40mm below the axel centerline(watts link). I have front roll center spacers under the struts that are about 45mm high. the lower control arms are about 25mm higher on the inboard crossmember end than the ball joint end.

Over the weekend, I lowered the rear roll center a further 25mm and added about 50Lb to the front rate.

The oversteer was reduced by the changes but there was still no sign of push. On a track like this its best to have a little push.

We have to run 100mm ground clearance for the rules.

My next thought is to go up in front anti roll bar size and lower the front spring rates. Im also thinking the rear roll center shouldn't be that low.

Yeah, I agree. Alan did a great job!
Regarding changing the front rate rather than the rear, its just hard to change rear rate at the track. a front spring change only takes about 15mins.

Alan said the car felt very loose, particularly on high speed corners and said it felt like the car had rear toe out!