need help gearing my brushless emaxx.

[blueb8llz]

i know its best to buy a few sets up pinion/spurs and try it myself but i really dont want to spend money on that sorta stuff just yet so which is why im asking you guys that have the experience already.
i have a 3905 and will be running a mmm, feigao 7xl, trakpower or neu energy 5000 20c. i really wont be doing too much speed runs, mainly bashing. my questin is whats the tallest pinion i can put onto a stock 68t spur to reach the fastest speed, yet not too big so i have to worry about thermal on the motor.
and with this pinion, will i still be able to wheelie on command even though its geared for more topend? i want something in the low 40's. i was gonna gear it 24/68 but someone told me i would only be getting 35mph with that. i can move up to a 26-28 but im not sure itll fit plus i dont want thermal or am i good to go with that size. or will i HAVE to switch out my spur to get the best setup? main thing is, i want the fastest setup without losing th abiltiy to wheelie and not have to worry bout thermalling. just a reminder, i dont do many speed runs so i think that will keep the motor a lit bit cooler than most of how you guys run your trucks.
thanks for the help guys and sorry for the long post. its just because i am going to place my order (not the mmm) first thing tomo and i want to get all the info i can get now, and so that i dont have to do the trial and error thing and end up wasting money on exttra pinions and spurs. yea im a cheapo when it comes to those two things cus i noticed once i have a set spur/pinion, i NEVER change it for some reason...well thats when i had my buggies and stadium trucks and onroad cars.

[E-Revonut]

http://scriptasylum.com/rc_speed/_top_speed.html

That's the top speed calculator which ought to help you. I have found that this seems to be off a little bit but a 22t should put you about where you want speed wise but I would suggest going to an 8xl and gearing higher.

You can copy and paste the information below to post your values into a forum thread:

Differential Ratio: 2.8461538461538462
Transmission Ratio: 1.8333333333333334
Other Ratio: 1
Spur Tooth Count: 68
Pinion Tooth Count: 22
Total Voltage: 14.8
Motor KV: 2382
Tire Diameter (inches): 5.75
Tire Ballooning (inches): 0.5
Motor Current Draw: 0
Motor coil Ω: 0.0056
Spur/Pinion Ratio: 3.09 : 1
Total Ratio: 16.12821 : 1
Tire Circumference (inches): 21.21 inches (538.63 mm)
Total Motor Speed: 35253.6 RPM
Vehicle Speed: 43.89 mph (70.51 km/h)
Effective Speed Rate: 2.97 mph/V (4.76 kmh/V)
Estimated Adjusted Speed: 41 mph (66 km/h) - 6% loss
Effective KV Value: 2382
Motor Torque: Amperage not specified...
Final Torque: Amperage not specified...
Final Power: Amperage not specified...

Originally Posted by blueb8llz

i know its best to buy a few sets up pinion/spurs and try it myself but i really dont want to spend money on that sorta stuff just yet so which is why im asking you guys that have the experience already.
i have a 3905 and will be running a mmm, feigao 7xl, trakpower or neu energy 5000 20c. i really wont be doing too much speed runs, mainly bashing. my questin is whats the tallest pinion i can put onto a stock 68t spur to reach the fastest speed, yet not too big so i have to worry about thermal on the motor.
and with this pinion, will i still be able to wheelie on command even though its geared for more topend? i want something in the low 40's. i was gonna gear it 24/68 but someone told me i would only be getting 35mph with that. i can move up to a 26-28 but im not sure itll fit plus i dont want thermal or am i good to go with that size. or will i HAVE to switch out my spur to get the best setup? main thing is, i want the fastest setup without losing th abiltiy to wheelie and not have to worry bout thermalling. just a reminder, i dont do many speed runs so i think that will keep the motor a lit bit cooler than most of how you guys run your trucks.
thanks for the help guys and sorry for the long post. its just because i am going to place my order (not the mmm) first thing tomo and i want to get all the info i can get now, and so that i dont have to do the trial and error thing and end up wasting money on exttra pinions and spurs. yea im a cheapo when it comes to those two things cus i noticed once i have a set spur/pinion, i NEVER change it for some reason...well thats when i had my buggies and stadium trucks and onroad cars.

if you are concerned about your temps you got the wrong motor, the 7XL will run hot, I would have gotten a 9XL, How much voltage will you be running?and dont be concerned about not being able to wheelie with a BL truck, you will get tired of that quick, and you will be more concerned about how to get it not to wheelie.

[jediguru]

Why not move to a smaller spur? All the Jato spurs fit right on. Or even a 62T for the emaxx. I ran 22/54 setup for awhile with a 10XL on 5S. The thing was crazy fast. Temps were not too bad either. I must concur with azjc as far as keeping temps in check.

[blueb8llz]

i chose 7xl becuase i hear alot of ppl are running 7xl with no problems. i mean they say there motor gets hot, but its fine. but main thing is i KNOW i dont run nearly as hard as any of them either. i rarely do speed runs, i pretty much only full throttle it only for like 3 secs and then i let off. i just like to go up hills and go over terrain. but i jus like the speed of bl so when i do feel the need for speed i can.
oh, ill be running 2 packs 2s. and is there a difference when ppl lower the spur instead of raising the pinion. i know the pinion is more costly but say...if 24t/68spur got me 42mph, and 21t/62spur got me 42mph, how come i always see more ppl lowering the spur and pinion when they could have just changed one thing which is the pinion. does having a lower spur count reduce temps, run smoother, more effieciant or something.

Originally Posted by blueb8llz

i chose 7xl becuase i hear alot of ppl are running 7xl with no problems. i mean they say there motor gets hot, but its fine. but main thing is i KNOW i dont run nearly as hard as any of them either. i rarely do speed runs, i pretty much only full throttle it only for like 3 secs and then i let off. i just like to go up hills and go over terrain. but i jus like the speed of bl so when i do feel the need for speed i can.
oh, ill be running 2 packs 2s. and is there a difference when ppl lower the spur instead of raising the pinion. i know the pinion is more costly but say...if 24t/68spur got me 42mph, and 21t/62spur got me 42mph, how come i always see more ppl lowering the spur and pinion when they could have just changed one thing which is the pinion. does having a lower spur count reduce temps, run smoother, more effieciant or something.

a spur gear with a smaller amount of teeth will make your gearing taller, this will increase your motor temps, increase your top speed and make the throttle less reponsive, and to a certain point keep the trucks nose down, also increasing your pinion size does the same thing

[A RC Dude]

not meaning to tack controle of your thread but about what would be the gearing for a 9XL on 12 NmHi cells in a old e-maxx without 1st gear? i just need to know about what the correct rotio of pinion to spur i would need to start off with so i don't spend a wile trying to gear it correctly.

[A RC Dude]

does anyone know about what i would haft to gear my 9XL in my e-maxx?

[Arct1k]

18 -22T use brian's calc

see sticky http://www.rc-monster.com/forum/showthread.php?t=2259

[A RC Dude]

Originally Posted by Arct1k

18 -22T use brian's calc

see sticky http://www.rc-monster.com/forum/showthread.php?t=2259

ok i knew about that calc, i just couldn't seem to find it. thanks!