Which wire controlls the speed limit

[pablotheefred]

My ebike has like barely any documentation. Its a Tata contino etb 100 and id like to disable the speed limiter. It has no display either just a switch with 3 speeds
The controller is a ZN-C48
View attachment trying-to-get-more-info-about-this-controller-v0-v2ryadv19woc1.webpView attachment trying-to-get-more-info-about-this-controller-v0-63j0zmm09woc1.webp

 

[E-HP]

Does the bike go faster on speed 3 than it does on 2?

 

[pablotheefred]

Does the bike go faster on speed 3 than it does on 2?

yes

 

[E-HP]

Probably not limited. Why do you think it’s limited?

 

[pablotheefred]

Probably not limited. Why do you think it’s limited?

It doesnt go faster than 25kmhr

 

[E-HP]

The description of the bike states that it will go <25Kmph under ideal conditions, meaning it has enough power to barely go that speed sometimes, but less most of the time.

 

[d8veh]

My ebike has like barely any documentation. Its a Tata contino etb 100 and id like to disable the speed limiter. It has no display either just a switch with 3 speeds
The controller is a ZN-C48
View attachment 355899View attachment 355900View attachment 355901View attachment 355902

You really needed to show the external wires rather than the internal ones. One thing I can see is a lot of white wires, and white wires are often used for the speed limiter. If you have two single white wires that are either connected together in a loop or disconnected, make them the other way round, like dieconnect if connected and vice versa.

Other than that, one of the white wires should be in the motor connector. That is the speed sensor if it has one. You could try disconnecting it.

Some cheap controllers, especially the ones without a control panel, use the commutation pulses to calculate the speed, and the speed limit is programmed in the software, in which case you're stuck.