Pinion help for Crtx1
 

Hey guys I'm building a crtx1 with feiago 9xl w/heat sink, MM esc and bec and 4s lipo and all the rest is rc monster parts. I'll be using the kyosho 46t plastic spur and a 12 mod1 pinion. Does that sound like a good place to start? It's going to be a all around play toy. Any other tips would be sweet Thanks

http://www.scriptasylum.com/rc_speed/index.html

Run this - you are looking for 35-40mph

sweet
 

Thats awsome, but where did you come up with the 35-40 mph?

Theres a top speed calculator in the link he posted

http://www.scriptasylum.com/rc_speed/_top_speed.html - I'm pretty sure the standard truggy diff ratio 43/10, and the feigao 9xl is the same as the wanderer 9xl. Except when I do it says ~20mph

You need to adust your gearing to get 35-40mph... This is a good target speed for a track... You could go up to 45mph if you are just bashing.

But best to start a bit low gearing wise, check temps on everything and gear up slowly. It costs a bit more in pinions but will save more in the long run.

14-16T would be a good start...

Differential Ratio: 4.3
Transmission Ratio: 1
Other Ratio: 1
Spur Tooth Count: 46
Pinion Tooth Count: 16
Total Voltage: 14.8
Motor KV: 1853
Tire Diameter (inches): 5.8
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor coil Ω: 0.0092
Spur/Pinion Ratio: 2.88 : 1
Total Ratio: 12.3625 : 1
Tire Circumference (inches): 18.22 inches (462.82 mm)
Total Motor Speed: 27424.4 RPM
Vehicle Speed: 38.28 mph (61.49 km/h)
Effective Speed Rate: 2.59 mph/V (4.15 kmh/V)
Estimated Adjusted Speed: 36 mph (58 km/h) - 5% loss
Effective KV Value: 1853

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Not sure i follow 5.8 are proline CF's - Badlands are a little bigger maybe 6 and change but that is more for bashing?

I actually want to race and play ,I guess I need two different set ups. I have bad lands and some regular proline race tires. I had already ordered a 12t pinion to start. Is that bad?

It's a very good place to start, imo... especially for the track.

If you are bashing in the street and want it to be really fast then you will want some bigger pinions.

Awsome here's the truck

Lol sorry, just me being an idiot. I didn't realise I hilighted a tire circumference measurement... I thought you'd input an 18in tire diameter. My Bad!!:oops:

fwiw the a lot of the truggy wheels are still a bit smaller than 5.8".. proline's truggy LPR series for example are 5.25"