Subscribe for just just £1.25/mth!
Finished this project recently. Fitted the roll-over bar, home made battery holders, Spektrum receiver and a Robinson Racing double disc slipper (the 72t Nitro one, the spur fits nicely inside the gear cover). Given it a few runs. The acceleration is great: easily picks up the front wheels with my old 3300s and with my SMC IB3800s it flips onto the roof. Top speed is good, but i think i need to fiddle with the pinion gear: running a 16 tooth at the moment. The 9L motor gets quite hot, maybe gearing a couple of teeth lower would help. Problem is finding 32 pitch pinion gears with a 5mm bore to fit the Feigao 540C 9L's shaft. This is the reson i went for the biggest spur gear i could fit in the emaxx gear box: easier than finding smaller pinions. It is still two speed, although the 2nd gear is useless until i can lower the pinion. I was considering getting the stiff or ultra stiff Proline Powerstroke shock springs to compensate for the extra weight of 12 sub-c cells, but the stocks ones with a bit of preload work very well. The emaxx gearbox is about the same weight as the TNX one i removed, the esc and motor weight around the same as the TNX engine, the shocks will weight more than stock ones, but the wheels and tires less, so the weight comes from whatever the 12 batteries weight more than a tank of fuel and a receiver pack. I may go for a single speed conversion for the emaxx 'box in the future, then the weight saved from that and losing the gear select servo would probably make the weight difference minimal. I jumps beautifully with a neutral attitude. Still some things i would like to try, but for now it's finished :)
If you liked those pictures, you should see these...
Brushless TNX part 2