forgot
USA guy`s love the heavy spring load on there stocks ie;purple/purple
but in the uk
if your car is setup so it carries a `LOT` of corner speed then you can get away with purple/purple ,but if your a point & squirt merchant ? then forget it ,motor be so hot after 5 min it would glow
we run softer setup`s really
heavy springs = more friction,more torque,less top speed ,more heat
lighter springs= less torque,less heat ,less friction,more top speed
1/12th cars love green/green spring setup (no need for pulling power ,cars weigh as much as a box of matche`s)
1/10th little different
if you run lighter springs then bed the brushe`s in @2-3 volt 1 minute
to get the brush bed in with out causing brush bounce (bad thing) when you go onto track
also bumby track with light springs does not mix either