[Mitch58]

Borne,

The two cars being equal or similar the one with the faster motors and lower gears will have quicker acceleration coming out of a corner and better braking going in. Since the typical home track is small and twisty this is a great advantage. On a large commercial type track with long straights and long fast sweeping curves the advantage would be less but you could still run a bit deeper into the corner and be a bit quicker coming out
 If you're building something for your home track make it fit that track. If your building for a club race check the specs, they often limit gear ratios and motor speeds to keep the racing closer.
 The real key is the handling, weight, balance and most importantly the tires.
  For the grandkids I took three of my older Slot Its and put in H&R 18K motors, these have become my favorite cars to flail around the track.
, and make for some very close racing.

Back to the GT-3 proxy cars. On my 70' track anything under 8seconds is considered quick, anything under 7 seconds is fast. These cars were all in the 6s and the top 5 cars I believe were in the high 5s. I qualified them all myself, and the quickest cars were extremely smooth in the corners rather than just faster. The racing was done by three drivers and they all enjoyed them.