Motor Suggestion for Dual Brushless Stampede

[Mephiston]

Hey everyone!

I've decided to convert my stampede to 4x4 and put 2 brushless motor's in it.

This will be my winter project but i figure i might as well order one of the brushless systems first so i can use it right away.

I am planning on using the Xtreme 4x4 chassis which gives decent room for 2 batteries, so i was thinking 2 Lipoly 7.4v 4950 packs, run in parralel.

Any suggestions for motor's ? I would like to go 40 Mph (Mabye 45) and have very good torque as i do alot of constuction site bashing with a friend. I was thinking of 2 L Fiego motor's, just don't know what wind.

I will be using large tires (If that makes any difference) prolly Jumbo Imex Swampers or something similar.

Thanks

[MetalMan]

If you want to use a Feigao "L" motor, you are going to need to run more voltage than that. How about 2 of the packs you listed in series, running two 8Ls? That would make your 4x4 Pede pretty fast! But, the tires could possibly be too large for the 8L. If that were the case, then 2 9Ls would work.

BTW, if you want to see a how-to for a 4x4 'Pede, you can see mine that I made when I had my 4x4 'Pede back 1 1/2 years ago:
http://4x4pede.freehomepage.com/
(sorry about all of the popups. It's free webhosting...)

[RC-Monster Mike]

You may also consider the FastLane chassis. This is available as a regular length or extended length, and can accept the tranny on the front AND rear of the chassis, so it is ready for these conversions! I would use the extended length chassis myself. You could then run two of the cnc trannies, as well as two of the RCM heatsinks and steel diff gears for a sweet, bulletproof setup to die for!
For the motors, I would probably run with the Feigao 8s motors, or even lehner basic 4200 motors. Dual 11.1volt lipos would make this truck a complete animal! With dual motors, I don't think the "L" size is necessary.
I am actually excited just thinking about it! I hope you post some pictures when it is all done, too. I just love custom trucks!

By the way, welcome to the forums!

[Mephiston]

Thanks for the info guys.

I had no idea the Fastlane Chassis would work for this, but it's great that it will. This is for sure what i will be ordering.

Dual 11 volt Li-Poly's sound good also. I like the idea of the Fiego 8S (And the price :) ) What controller woul dwork fine with these and 11 volts ??

I will keep track of my progress and take some pictures, will be ordering the first load of parts at the end of this month.

[RC-Monster Mike]

The warrior controller would work well, as would the MGM controllers.

[coolhandcountry]

I have a question mike. If you was to drop back on the turn. Instead of the basic 4200 run a basic 2100. Wire the batteries in series. You would get the same speed with more power. Am I thinking right or wrong? Curious :)

[RC-Monster Mike]

Power in=power out (efficiency aside), so you would get nearly the same performance. You might feel a bit more punch, as the voltage wouldn't drop as much with half the amp draw, though, and you may notice a very slight increase in runtime(very slight).

[coolhandcountry]

OKay thanks mike. I thought I would throw a different aproach. Many heads better than one right :)

[MetalMan]

Temps would also be lower, since efficiency is better with higher voltage than lower voltage.

[RC-Monster Mike]

The temps likely be lower as well. true.

[Mephiston]

Would i get more power running low turn Basic XL motors, and run 2 7.4 Volt lipo's in series ?

I think im gonna convert to 32 Pitch gears also to deal with the power, and the largest spur that can fit on a pede chassis is a 60T, so i will prolly run 12-60 or 12-56. Does this make a difference on what motor i should use ?

[coolhandcountry]

If you run the xl motors you will get some more power ( torque). I was stating about the basic not xl. sorry if confusing you

[Mephiston]

What about runtime ??

Would it be different from small motors or large ones ?

Also what kind of runtimes would i get from running 2 7 volt packs in series, if i had 3800 packs and 2 motors it would be 1900 Mah per motor ? Which would be pretty short runtimes, or does it not work that way.

I figure i might as well find out all i can about this so i don't buy something i regret.

Thanks for all the help everyone!

[coolhandcountry]

The more batteries the longer your run time. With the smaller kv motors you get less draw as well. You can go either way. The 2 4200 or 2 2100 basics. You going to get 2 speed controllers. I not sure on the 4200 but you should be able to go with the 7020 instead of the 9920. Will save you a few bucks. If you have two motors drawing less say 80 amp. You have two motors only drawing 40 amps. The amp draw is only guess work. You are going to draw 80 amps of power off 14.8 v. It is something to think about. I think the batts run in series is a better choice. JMO I may be wrong. I would like to see it get down. The other 2100 will take a 5s or 6s lipo. You can run a 3s lipo in series for a 6s. You will have some series get down. Sorry if confusing you.

[RC-Monster Mike]

Any time I have tried to run two systems off one set of batteries, the runtime was horrible. I think you would be better off running the 11.1 Lipos seperately to each motor/controller. Be aware, though, that in a pede, the rear will likely use a little more juice vs. the front, simply due to the front having less traction on acceleration(less load). If you pay attention, you wouldn't have any troubles. The xl basic motors, as someone already mentioned, would have more torque than the basic series motors, but the actual performance difference in your application would be minimal. Dual motors will move your truck with authority for sure.