A slower slot car can sometimes be a faster race car - How to add a controller choke

Here is the next improvement to the electronic controller. This will work for most types of controller but check with the manufacturer before making any changes. I also demonstrate how this modification affects the speed of the motor.
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[@UFO-racer]

Great tips well explained

[@forrestwardener]

This is gold . Thank-you

[@jmcleave]

Thanks for watching 😁

[@BhartiPatil.]

@@jmcleave hey who are you?

[@jmcleave]

@@BhartiPatil. 🤫🕵️‍♂️

[@nflpicks4920]

Very informative, thanks!! Are you still going to give us the rest of the changes you made to make your Revo perform better

[@jmcleave]

Thanks for watching. Yes I have more RevoSlot stuff to come. I just need to get time to edit it all 😉

[@ali2ndmail]

That’s a neat install James! When you have the choke switched on, would you tend to leave the relay on so that you can still get full power when needed or have the relay off so the “top end” is always restricted by the choke? The reason I ask is that some people seem to use choke to control how the motor feels or how the power comes on rather than controlling max speed. I guess the downside of having the relay off is that the transistor will tend to run hotter but that is probably ok for relatively short races.

[@jmcleave]

I would tend not to use the relay when using choke. You would find quite a big step from the last power band to full power if you used the choke and relay at the same time.
The transistor would not get hot because of the choke, only through heat conduction into the heat sink if the resistors got hot. The Controller is still wired to bypass the transistor at full power, even with the choke activated.

[@ali2ndmail]

@@jmcleave thanks. Yeah what I meant about getting hot is that some controllers use the transistor to try and deliver full power when the relay is off, and the transistor would in theory get warmer if it's in use at all times, but hopefully this is minimal.

[@bradsanders6954]

Carrera digital of course you just turn the power down. The Slot it cars I picked up make maybe twice the power that can be used on my home track,so they get turned down and still go sideways any time the throttle is turned much.....More hours of work are still needed on them.

[@gersonfer]

And what about a "sensitivity": What is the difference between "choke" and "sensitivity" and how to implement "sensitivity" ?

[@waltersparks5271]

Why not just add a reostat in circuit with switch

[@jmcleave]

Hi Walter. A Rheostat with a switch would be fine for lower powered cars, but 25W very low ohmage rheostats are quite expensive and hard to find. I have not found one with less than 1ohm. I know you could then add a parallel resistor to reduce the ohms but it all starts getting more expensive and takes up more space.