New to brushless, what pinion should I use?

[Krawlin]

Well, to start out, would like to say hi to everyone, and I am new here!

Well, anyway, I have a 3906 E-Maxx thats been upgraded (not nearly as nice as most of the Maxx's on here, but its gets the job done). And over the past 10 months, it has stayed brushed, and I am ready to go brushless and Li-Po. (You guys can blame Takedown and Brushlessboy16 for this... )

Anyway, so I already picked the motor that seems to be just right for the job......

A Medusa V2 Afterburner 36-60 2000Kv motor.

I already have a Mamba Max ESC, and I plan on running two 2S Pro-Tek 4000 mAh 30C Li-Po packs wired in series for 4S.


Now my main question is, what pinion size do I use? Remember, this is the 3906 E-Maxx with a 2 speed tranny, (just go by running in 2nd gear all the time), the diff gears are stock, and it has a 66 tooth spur gear.
Now with that in mind, I am shooting for the 40 to 45 MPH range on 12 cells Ni-MH and 4S (just go by running on LiPo most of the time).

So, what pinion should I use? Someone told me 19 to 21 tooth would be perfectly fine, while someone else told me I should run something in the 23 to 25 tooth range. So what pinion should I run?

I know zero about this brushless stuff so I am pretty much lost.....

So is the Medusa V2 Afterburner 36-60 2000Kv motor a good choice? If not, what would you recommend? I am on a bit of a budget here.

And what pinion size should I use for the motor I chose, or if you recommend a better motor, what pinion should I use for that? Remember I am shooting for at least 35 MPH when running 12 cells Ni-MH and 40 to 45 MPH on 4S Li-Po.

(and I am on a bit of a budget, my GF won't let me spend too much on this.... )

[brushlessboy16]

http://scriptasylum.com/rc_speed/_top_speed.html
R/C Calculations

godly tool, you can do the math yourself chris :D

[BrianG]

I would start with the lowest gearing, run it, see how the temps are, and if they are ok, gear up until you hit your desired max speed or temps prohibit further gearing.

Oh, and welcome to the forums!

[Takedown]

Hey krawlin... Dont I know you?

I would try stock spur teeth which I think is 66t and around a 18-21t pinion. Thast what I ran my 8xl on and it ran only warm on 4s and your motor is the same kv and from what i hear power is about even.

[Krawlin]

Originally Posted by brushlessboy16

http://scriptasylum.com/rc_speed/_top_speed.html
R/C Calculations

godly tool, you can do the math yourself chris :D

Originally Posted by BrianG

I would start with the lowest gearing, run it, see how the temps are, and if they are ok, gear up until you hit your desired max speed or temps prohibit further gearing.

Oh, and welcome to the forums!

Originally Posted by Takedown

Hey krawlin... Dont I know you?

I would try stock spur teeth which I think is 66t and around a 18-21t pinion. Thast what I ran my 8xl on and it ran only warm on 4s and your motor is the same kv and from what i hear power is about even.

Thanks Ben!

Thanks BrianG!

Thanks Ryan! (Yeah, I think you do know me.... )

That helps a bit, not much more info than I already had, but I will just mess with it and change around until I get speed, and good temps. And if I don't have insane torque, well thats why the E-Maxx came with a 2 speed tranny, for torque and speed!

[brushlessboy16]

your 2 speed gears arent gonna last that long

[Takedown]

He has steel idlers it should be fine for awhile. In the future you may want to disable the 1st gear and possibly take it out so their less rotating mass.

[Krawlin]

Originally Posted by Takedown

He has steel idlers it should be fine for awhile. In the future you may want to disable the 1st gear and possibly take it out so their less rotating mass.

Yeah, I have seen the single speed conversion they haver here on the RC-Monster store, but I will get that once I chew up the lower gears or decide to race it.

[Takedown]

You could also look into a full steel 1spd tranny with sikeston's outrunner tranny hybrid idea. Basically an outrunner DD setup that draws less amps.

[Krawlin]

Originally Posted by Takedown

You could also look into a full steel 1spd tranny with sikeston's outrunner tranny hybrid idea. Basically an outrunner DD setup that draws less amps.

That the one where the outrunner is attached right to the top shaft?

[Takedown]

Originally Posted by Krawlin

That the one where the outrunner is attached right to the top shaft?

The outrunners shaft is the top shaft.

[Krawlin]

Originally Posted by Takedown

The outrunners shaft is the top shaft.

Ah ok, didn't know that..... Lol, shows just how much I know about this brushless stuff.....

[kulangflow]

Originally Posted by Krawlin

And if I don't have insane torque, well thats why the E-Maxx came with a 2 speed tranny, for torque and speed!

Asheck did a standing backflip with that motor on 4s. I think you'll have sufficient torque.

[Krawlin]

Originally Posted by kulangflow

Asheck did a standing backflip with that motor on 4s. I think you'll have sufficient torque.

Oh....... Once again, thank you, I know nothing about this brushless stuff .