Set-up

[pitwizard]

I've been racing on and off for a few years, but just got back into it recently. I never really bothered with setup in the past, but am trying to learn what changes do what now, but i'm really not sure if it can really make a difference on a toy plastic car!

Do you change your setup because:
a) Somebody tells you to so it must be better
b) You think it will be better but you can't really tell a difference
c) You think it will be better and can tell a difference
d) You don't bother because it makes no difference