feiago 9xl

[Arct1k]

i think undergeared - i would guess that the motor is running flat out most of the time...

Do you find yourself at 100% throttle for long periods? Have you used briang's script - gear for 35mph ish

do you have an rcm heatsink - works well and you can add a couple of 25mm fans iy you want

[lincpimp]

The crt has buggy ratio diffs, 43/13. So he is way overgeared, with the 46/12. I have a crt and will upgrade it to the HB truggy diffs, 43/10, and run 46/13 primary gearing.. Stock spur on the crt is 62t. So changing back to that spur and running a 12t hardened pinion would do the same as the truggy diffs. Give that a try if you can, and see how it does!

[Jammin]

Originally Posted by lincpimp

The crt has buggy ratio diffs, 43/13. So he is way overgeared, with the 46/12. I have a crt and will upgrade it to the HB truggy diffs, 43/10, and run 46/13 primary gearing.. Stock spur on the crt is 62t. So changing back to that spur and running a 12t hardened pinion would do the same as the truggy diffs. Give that a try if you can, and see how it does!

It's a crt x1, not the buggy. Mike at rc monster told me that I was undergeard and needed a 16t pinion. Does that make sense. Oh and to answer the other questions, I do have a heat sink and the connections are perfect. Also the truck rolls fine. thanks guys

[lincpimp]

Originally Posted by Jammin

It's a crt x1, not the buggy. Mike at rc monster told me that I was undergeard and needed a 16t pinion. Does that make sense. Oh and to answer the other questions, I do have a heat sink and the connections are perfect. Also the truck rolls fine. thanks guys

According to OFNA website online manual for the crt x1 it has buggy ratio diffs, 43/13.

They list 40516 for the pinion: http://www3.towerhobbies.com/cgi-bin...FVSEARCH=40516

And 40517 for the ring gear: http://www3.towerhobbies.com/cgi-bin...?&I=LXLMX2&P=7

The truck also comes stock with a 62t spur gear and a 13t clutchbell to make up for the tall tires, 5.75", considering it has the buggy ratio diffs.

So you are only turning the 9xl 27k rpm max right now.

Here is the speed calc of your setup:

Differential Ratio: 3.3076923076923075
Transmission Ratio: 1
Other Ratio: 1
Spur Tooth Count: 46
Pinion Tooth Count: 12
Total Voltage: 14.8
Motor KV: 1853
Tire Diameter (inches): 5.75
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor coil Ω: 0.0092
Spur/Pinion Ratio: 3.83 : 1
Total Ratio: 12.67949 : 1
Tire Circumference (inches): 18.06 inches (458.83 mm)
Total Motor Speed: 27424.4 RPM
Vehicle Speed: 37 mph (59.43 km/h)
Effective Speed Rate: 2.5 mph/V (4.02 kmh/V)
Estimated Adjusted Speed: 35 mph (57 km/h) - 5% loss
Effective KV Value: 1853


I am not sure why this is getting hot, but I do not think it is undergeared, just undervolted. Getting the motor speed up to 35k or so will provide better results, but then you will have to gear down. That is why i suggested to either go with a larger spur or the hb truggy ratio diffs.