Talk 1520 - your experiences

[Jahay]

Alien, i only bash but i have plenty of space to run and love my high speed runs... But i dont do repeated high speed runs like some do. My truck is around 13lbs and im running strapped HPI dirt claw tires on SPI Rims.

these are the results i got from the speed calc

Differential Ratio: 3.3076923076923075
Transmission Ratio: 2.215277777777778
Other Ratio: 1
Spur Tooth Count: 44
Pinion Tooth Count: 25
Total Voltage: 22.2
Motor KV: 1800
Tire Diameter (inches): 5.91
Tire Ballooning (inches): 0.5
Motor Current Draw: 0
Motor Coil Resistance: 0
Spur/Pinion Ratio: 1.76 : 1
Total Ratio: 12.89632 : 1
Tire Circumference (inches): 21.71 inches (551.39 mm)
Rollout: 1.68:1
Total Motor Speed: 39960 RPM
Vehicle Speed: 63.7 mph (102.32 km/h)
Effective KV Value: 1800
KT constant: 0.75 oz-in/A

As you can see on a 6s running 44/25 and accounting for tire ballooning at 0.5" i can hit 63mph supposedly... This setup doesnt include the 39t Idler which would probably give me up to 10mph more.

If i really am capable of these speeds then i would def gear down as i would never reach those speeds anyway.

[ANGRY-ALIEN]

hmmm... Interesting... but i'm a little confused... Do you want to run 1520 or a 1518? the 1520's KV is 1600 (you have 1800 which is the 1518's KV)...
I am pretty sure the 1520 can push that truck to the 60s, but if you are going to bash with it geared that high (accelerating hard and braking hard), the motor
might start getting warm a little faster... I have geared my truck for the high 40's to 50's and the motor handle it well... but I don't think during bashing
I have ever gone past the lower 40's... So now I am geared for the high 30's and the motor seems to like it temp wise and the acceleration never gets old.

Your setup with some changes:

Differential Ratio: 3.3076923076923075
Transmission Ratio: 2.215277777777778
Other Ratio: 1
Spur Tooth Count: 44
Pinion Tooth Count: 25
Total Voltage: 25 <------------- 6s on peak charge
Motor KV: 1600 <-------------- 1520
Tire Diameter (inches): 5.91
Tire Ballooning (inches): .5
Motor Current Draw: 0
Motor Coil Resistance: 0
Spur/Pinion Ratio: 1.76 : 1
Total Ratio: 12.89632 : 1
Tire Circumference (inches): 21.71 inches (551.39 mm)
Rollout: 1.68:1
Total Motor Speed: 40000 RPM
Vehicle Speed: 63.76 mph (102.42 km/h)
Effective KV Value: 1600
KT constant: 0.85 oz-in/A

I recommend you gear down for bashing (it should make your Batts happier too):
Differential Ratio: 3.3076923076923075
Transmission Ratio: 2.215277777777778
Other Ratio: 1
Spur Tooth Count: 44
Pinion Tooth Count: 18
Total Voltage: 25
Motor KV: 1600
Tire Diameter (inches): 5.91
Tire Ballooning (inches): .5
Motor Current Draw: 0
Motor Coil Resistance: 0
Spur/Pinion Ratio: 2.44 : 1
Total Ratio: 17.91156 : 1
Tire Circumference (inches): 21.71 inches (551.39 mm)
Rollout: 1.21:1
Total Motor Speed: 40000 RPM
Vehicle Speed: 45.91 mph (73.74 km/h)
Effective KV Value: 1600

Differential Ratio: 3.3076923076923075
Transmission Ratio: 2.215277777777778
Other Ratio: 1
Spur Tooth Count: 44
Pinion Tooth Count: 16
Total Voltage: 25
Motor KV: 1600
Tire Diameter (inches): 5.91
Tire Ballooning (inches): .5
Motor Current Draw: 0
Motor Coil Resistance: 0
Spur/Pinion Ratio: 2.75 : 1
Total Ratio: 20.15051 : 1
Tire Circumference (inches): 21.71 inches (551.39 mm)
Rollout: 1.08:1
Total Motor Speed: 40000 RPM
Vehicle Speed: 40.81 mph (65.55 km/h)
Effective KV Value: 1600