Differential Ratio: 3.3
Transmission Ratio: 1
Other Ratio: 1
Spur Tooth Count: 46
Pinion Tooth Count: 15
Total Voltage: 14.8
Motor KV: 2100
Tire Diameter (inches): 4.5
Tire Ballooning (inches): 0.1
Motor Current Draw: 0
Motor coil Ω: 0
Spur/Pinion Ratio: 3.07 : 1
Total Ratio: 10.12 : 1
Tire Circumference (inches): 14.77 inches (375.04 mm)
Total Motor Speed: 31080 RPM
Vehicle Speed: 42.94 mph (68.98 km/h)
Effective KV Value: 2100
KT constant: 0.64 oz-in/A
Here are the results from THE calculator. Is Sutton an absolutely massive track or something? You are geared for a higher speed than I was with my Losi, and I was outpacing nitros down the straight (only just though).
If so, go with a 16T pinion and something like a 48T spur if possible. This should keep you as fast. The main problem with gearing up, is that, it heats up everything, and run time is reduced.
Differential Ratio: 3.3
Transmission Ratio: 1
Other Ratio: 1
Spur Tooth Count: 48
Pinion Tooth Count: 16
Total Voltage: 14.8
Motor KV: 2100
Tire Diameter (inches): 4.5
Tire Ballooning (inches): 0.1
Motor Current Draw: 0
Motor coil Ω: 0
Spur/Pinion Ratio: 3 : 1
Total Ratio: 9.9 : 1
Tire Circumference (inches): 14.77 inches (375.04 mm)
Total Motor Speed: 31080 RPM
Vehicle Speed: 43.9 mph (70.51 km/h)
Effective KV Value: 2100
KT constant: 0.64 oz-in/A
Here are the results from the set-up I suggested. It's only 1mph more, but it should be enough. Try the 16T pinion on it's own first though.
I'm thinking it could be the Losi battery. The true C rating on those is only about 15C, so it won't be capable of providing the sort of current you're after. If you have another 4S lipo to try (like a Flightpower), give that a go instead, and see if there is any difference. I just can't believe you are outpaced down the straights by the nitros on that set-up.
Oh, and for ride height, start with arms level, and if that's not quite enough, go for driveshafts level.
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