Juanchoyo

Hi guys I was wondering if there's any advantage if you plug your motor positive wire like this



From the battery wires, connect the + wire directly to the motor....

Will it work in any speed control... in my case it's TEU101BK from Tamiya....

What do u think?

trailranger

From what I understood, the positive wire needs to be a direct connection from the battery to the motor. The ESC only needs a the jumper positive wire to complete the circut for the BEC to operate which powers on the ESC.

Juanchoyo

So I can connect it this way... may get a lil lower Resistance...

mmm good to know the ESC only needs the + wire to operate itself.... gonna try it...

a_main_attendee

iTrader: (2)

If you take the case off of ANY brushed speed control with four wires the positive of the battery cable will be soldered onto the positive of the motor on the PC board anyway. You will not notice any difference if you do this or not.

Trips

iTrader: (16)

It's a bit hard to tell from that picture, but it looks like there's a wire direct from the plug to the speedo, and another wire jumped off the middle of that going to the motor.

It would be better to have the wire go directly from the plug to the motor positive, then jump off that to the positive terminal of the speedo. That way you don't depend on the solder joint to be perfect to get the most current to the motor. You want to minimize the number of solder joints in the current path from the battery to the motor.

Juanchoyo

So no advantage at all??

Trips

iTrader: (16)

The fewer joints between the positive battery terminal and the motor, the better. The picture you posted shows an extra joint that could be eliminated.

a_main_attendee

iTrader: (2)

The thing is the fact that there are no more joints if you where to do it one way or the other, budget esc's just have this "joint" inside the case for simplicity. Less pc board can be used with the three wire setup, but there are no advantages.

Think about it like drawing blood from one arm and then injecting it into the other, it will do nothing (theoretically, of course, this is only an example).

Just as if you cut the wires and re soldered them, it isn't doing anything, because they are allready connected within the case.

TwoTone

iTrader: (12)

A_main the point Trips is trying to make is have the solid wire- battery to motor.

The run the ESC of the patch wire. The opposite of the way it now

sosidge

WHOAH HORSEY!

Tamiya 101 is a reversing speed controller - you can only wire forward-only speed controllers with "three wires".

Just leave the wiring as the instructions suggest.

Trips

iTrader: (16)

Two tone understood what I was trying to communicate.

TwoTone

iTrader: (12)

Depending on the car layout, I've wired it with one wire.

Cut out a section of insulation right where the motor is, so it goes battery to motor to ESC.

olev

Actually, most of the 4-wire reversing speedos work perfectly when wired in 3-wire mode (leaving the positive motor connection open). Of course the reverse will not work (that's the only thing the positive motor wire from ESC provides), but as an extra bonus you'll cut the resistance of the ESC in half, since the positive to the motor is not switched through the FETs any more, but connected directly.