In the UK we mostly run on carpet over the winter. Though the biggest series in the UK (Worksop) have a venue with a king of rubbery floor.
Almost everyone runs schumacher yellow minipins, although some of the less experienced drivers prefer the less grippy minispike.
I always run my cars driveshafts level, any lower and the car feels wrong. It fells like the car is sagging if you run to low.
Limiters can be very usefull to control the amount of grip, I would suggest finding a balance to the spring/oil setup that suits you and then fine tune the car with limiters. With the S2 you will need to run a fair bit of droop on the rear suspension to keep traction, but you can control the roll of the car by adding a rear anti roll bar (B4 one fits nicely) You can add up to about 4mm of spacing inside the front shocks to calm any aggresive steering down, more than 4mm and the car will reduce the suspension travel to much.
S2 setup for high grip carpet would be: front 40wt, red piston, black or blue spring outside hole on wishbone. rear: 25wt red piston, red spring, inside hole on wishbone.
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