[Nep72]

There's a trick that many rally racers in Spain use: they add a thin wire between controller and track. This creates a voltage drop (around 1-2 volts) necessary to tame most hi-speed motors such as NC5, NC6 and so.

If you want a REAL connector for the controller I reccomend Neutrix XLR or compatible audio connectors: extremely low impedance, high current and safety lock. That's what I use and I'm glad with this system.

 

[Nep72]

Sorry, sorry, sorry, I mean 3-pin Neutrik XLR. Handwriting error (x->k).

Neutrik is the brand, but there are cheaper, equivalent connectors. You can find more info and datasheets here-> http://www.neutrik.com

My controllers with 4mm banana and 6.35 jack adaptors:

If you want to wire'em, here's the schema:

Maybe I already showed this picture before...

 

[Nep72]

Sure!

How do you say... "ne pas problem".

XLR schema is: female, connection side; male, solder side.
Transformador is transformer
Pista is track
Mando (Controller):
Resistencia -> resistor
Máximo -> maximum
Freno -> brake
Cursor... ehem... ;-)