[Mitch58]

I just hosted these cars. I suggest you keep playing around with the amount and placement until you find what works best on the track you are racing on.
  Per spec these cars ran the same motor so they were all pretty close to the same speed. It was the handling that made to difference. While all the cars drove well on my routed track, the top half dozen or so drove like Slot It or NSRs, smooth and quiet they felt like you could go as deep into a turn as you wanted.
  I would have loved to have taken them apart for a peek but as a host I don't take them apart unless something needs fixing.