Help with controller settings pls

[justmejc]

I have recently fitted a 36v battery and LCD800 controller to an old cyclamatic ebike. The motor is a rear 24v 250w bafang hub.

Although the motor works fine with no load or on the throttle it seems to be really lacking in power on even the slightest slope. Can anybody advise what the P2 'magnetic pole conversion ratio setting' should be?

The PAS sensor has 8 magnets, but I dont know the specification for the motor or how to work out the required setting.

Also, the bike does not have a speed sensor fitted.

Any help gratefully received - thanks

 

[Nealh]

Try setting the value to 80 -84 to see if that helps, the motor ratio setting is hub reduction ratio x motor magnets. Being an older Bafang hub reduction is likely 4:4:1 with 18 to 20 motor winding magnets.
Does the hub have any id on it like swxk etc,etc.

If the controller has a separate speed wire connector or a hall sensor block then you can add a spoke magnet and sensor on the rear stay. Simply pick up a 5v for the Red/5v wire , any Gnd for the Black wire and the third wire might be White or any other colour will go to the hall block White wire. One can pick up the 5V from the hall block, throttle or PAS connector like wise for the Gnd.

 

[Nealh]

One can also use a gps to get the ratio number quite close as well. Set the cut off speed to 25km/h and use a gps to calibrate, if the two don't concur then adjust the P2 up or down until the display matches as near as poss the gps reading.
Without motor specs it is trial and error but you should get the setting nearly right eventually.

 

[justmejc]

Thanks Neal, Ive tried setting it between 80 and 84, and it is ever so slightly better, but to be honest I cant feel much difference.
I cant see any id on the hub at all, but at a guess, given how long its been in the garage, and when I bought it from a neighbor, i'd say it was manufactured around 2010. It has a hub (band?) brake if thats any clue as to its age.
How far out of the 80-84 range is it worth experimenting?
thanks

 

[Nealh]

You can try going down but I would say try up to 100, the gps speed matching is pretty reliable at getting the setting close as long as you have the correct speed magnet count right which for most is one per revolution.