guys correct me if i'm wrong.
but here's my theory about bigger and smaller pulleys.
i will set an example (principles of wheelchair)
for example if you are sitting on a wheelchair and if you want to accelerate from rest position and then you rotate the wheels. the outer part of the wheels will be much easier to rotate than the inside part of the wheelchair(center part of the wheel).
when applied to RC. I think the rc will move much freely and easily when using larger pulleys compared to smaller pulleys.
i hope you understand my explanation.
try to imagine your sitting on a wheelchair and you are rotating the wheels. of course the outer part of the wheels will be much easier to move than the inside part of the wheel chair.
look at the pic (the hand of the man is holding the outer part of the wheelchair).
not only the acceleration will be affected but also when the car is running it operates much better so it means much more effecient = much faster.
also when using larger pulleys the belts will hold/clamp the pulley much better so it means the drivetrain loss will be lessen.
guys correct me if im wrong..