Thank you all for such great responses!
So far I have seen no real reason why a 2 belt version wouldn't work better.
My buggest problem building this car has been how much battery can I fit between the chassis and top plate.
Most all of the LiPo cells of over 2200mah are longer than 130mm and the current layout only lends itself to about 100mm X 80mm X 30mm. So, if a complete ground up design is feasable, running a 2 belt system would lend itself to a less obstructed chassis thus allowing longer cells equaling longer run times. I am using the HV Max 4.5 system from novak because I wanted a sensored motor and it simply fit the space better than most of the motors mentioned. I would love to try out the MMM from Castle if it ever comes out.
I think the key to making this type of car really scream is more voltage.
5s or maybe 6s 5000mah will yeild the rpm and should increase the run time to over 10 minutes.
One more thing on the belt issue...
It's true that narrower belts will be more efficient but keep in mind that these cars go over 70MPH and there is no such thing as a soft crash at these speeds. So while I agree that the drivetrain needs to be more efficient, It has to be strong enough to handle the loads of big, grippy tires on a big grippy track. Belive it or not, I was running 48 pitch gears on the car the day that video was shot. They held up just fine...
The 2 speed is not yet possible because in order to take advantage of the motor braking you must remove the mechanical brakes and servo.
Many of you with experience using 2 speeds should remember that it is designed with a oneway bearing. So, when you hit the brakes with the motor, the car will keep rolling.
Perhaps someday I will figure out a way to make the 2nd gear clutch stay engaged except for when accelerating from a slower speed.
Keep up the chatter and maybe we can get the attention of an established factory. I would like to eventually design a kit that will move forward with what could be concidered the pinacle of battery powered RC racing.
If there are any connected people reading this thread, perhaps we could work together to continue this project toward a particular branding. Any help would be greatly appreciated.