Speed vs. Torque

killsumptin

I understand that you can't have your cake and eat it too. If you want speed, you sacrifice torque, and high torque = lower speeds.

However while surfing the internet, I came across the Alltrax site, and they seem to have developed a comprimise of sorts.

According to them, you can install a high speed motor and get 20+ mph and then add a 650 amp controller and see a 30% increase in torque.

Is this too good to be true?

Someone more knowledgeable than I please enlighten me.

killsumptin

The reason this sounds sooooo good to me is that I must buy my upgrades a little at a time. I'm thinking about adding the 650 amp controller next, and later on doing the motor upgrade.

Will this controller give my 1986 CC 36v motor running on 48V more torque?

killsumptin

this motor seems too good to be true. Check out the price. Anyone know anything about it?

http://www.diversifiedcartsandparts....FQJRlgodrQ2SQQ

scottyb

From what I am able to grasp so far......
You can have some of both. Someone suggested a 36v motor built for torque
run on 48v ( check if the manufacteror will warranty on 48v).
Makes sense to me. 33% more rpms. Someone please correct me if I'm wrong here, 480 non-programable curtis will run this thing well enough for most applications.
But if you are looking for a street racer that will mountain climb, It may not happen. Kinda like do want the 4x or cuda?
The motor you showed says it is a speed motor with 10% torque loss running on 48v.....

killsumptin

Yes, that's what I was thinking also. But according to Alltrax, if you up the amperage capability of the controller , to say 650 amps, you recover enough of the lost torque from using the speed motor, and actually realize a 30% gain in torque.

scottyb

You probably need to ask Nate about this one. But from what I hear....The controller is a valve. It like the faucet on a hose. U can't get more water out of the hose by simply putting a larger faucet on it. Unless the faucet is restricting the flow. If the input ( Battery Pack) is not increased then there is just x amount of amps available . So that if all amps are available thru a 450 amp controller - going to a 700 amp controller will give no gain. Nathan?

killsumptin

You and I are of the same mind. I am going to post Alltrax description and let you see what they say.

scottyb

okay

gornoman

My experience so far:

36v 275amp stock E-Z-Go Fleet. Upgraded to the Alltrax 400amp Programmable, saw a nice bump in torque, speed was the same.
Upgraded to 48v saw another bump in torque, and a big speed increase, still on same motor. I figure my next step is a higher RPM motor.

scottyb

Gorno, thanks man. Thats's the good stuff, right there.
That is exactly the kind of info we are needing!
Tells me the 275A controller was not a big enough faucet.
36v motor on 48v turns . what? 33% more rpms? so a 3000rpm motor turns @4500rpms = more speed and with 33% more volts = more torque, Right?
So now, if you go to a new motor what voltage, hp, and rpm are you going to select?
The Q nagging me is would a 36v motor on 48v be snappier than a 48v motor?
Thanks for your input!