RC10Talk - The Net's Largest Vintage R/C Community

Been on a mission to resurrect the old JRX2 and here's what I'm going to run...not ready to go brushless yet because I'm not ready to spend the money...already sunk way more into this project than I planned!

18x5 brushed motor
Losi LRM tranny w/slipper
GensAce 4000mah 7.4v Lipo batteries
Traxxas xl5 ESC w/Lipo cutoff
Traxxas 2075 servo
FlySky 2.4ghz GT3-B controller
FlySky digital 3 channel receiver
Brand new bearings all around...bought a jrx2 kit from Boca Bearings that covers every bearing in the car

...and now my concerns...

With those parts above on a jrx2/junior 2, do I need to be worried about burning or tearing anything up? Tranny? Axles?
Is the ESC going to get too hot?
Is the motor going to get too hot?
Any issues with my servo, or will it perform as good/better than the old Futabas we ran back in the day?

I can try to keep things cool with a clip on Parma heat sink from back in the day, and I have a novak cooling fan but I don't know if I should mount it on the ESC or fabricate a mount for the motor.

I also have a Dynamite ECX1070 ESC that I could use in place of the xl5 but I don't know anything about it.

I think youll be fine with that set up, it's pretty mild. You'd probably have a hard time destroying anything with an 18 turn but as long as the slipper is set you'll be fine.

The XL-5 is good down to a 15T motor so no worries there, just make sure your geared right

18 x 5 is fairly mild but probably isn't the best motor for offroad being a quint. The higher the wind count produces less torque but produces more RPM, good for onroad. Just make sure it's geared properly and it will be fine.

The Traxxas servo will work and is a cheap digital servo with better specs than the old Futabas, but it is just that, cheap. It will still work fine though.

I've got a bunch of other motors but they're all stock...are you saying I should go with less turns/more torque for off-road, or something that's a single/double/triple instead of the quint?

That motor will be fine, you'll probably have to gear it one tooth lower than you would a 18 x 1 or 18 x 2.

Generally single and double winds are offroad winds, tripples, quads, quints and hex's are onroad winds, although occasionally seeing a tripple in an offroad isn't uncommon.

Word...so run the 18x5 on the street and find an 18x2 or something along those lines for off road...or just play with the gearing and leave the motor in there. The motor is apparently pretty rare and I can't find any info on it, so I may just run one of the bajillion 27x1 stock motors I have unless I'm racing.

Just stick with the motor you have unless you want to buy another motor. An 18 turn is a strange motor as it wasn't very common.

We ran 15x6, 17x5 and 18x4 on looser small dirt ovals back in the day, they would all turn the same lap time...mostly, just a matter of torque curve and punch by windings.

Anything will work, even the 27t stockers can be fun!

The best thing about 27t stock motors is they're safer...you only have a 75% chance of tearing your car up instead of a 90% chance, lol.

lipo with 27t stock will be enough, even with 18x5 your still fine with your set up