Kt parameters lcd8h

[KWR01]

Looking for a bit of help to tune my controller and sort the speed out. Currently using kt 48v 35a max 1500w controller on a 3000w direct drive hub motor. Currently topping out at 22mph

Currently settup on pic.

 

[docw009]

You've set C5 to limit the controller to 50% of available current. Use 10 for max current.

My KT LCD3 controllers don't get that fancy with C4. I usually set it to 0 to disable throttle unless I have set PAS 1 or higher. Safety measure. I've had my bikes take off too many times when the throttle gets bumped if it's left always ON. In any case, read your LCD8H manual. It talks about an additional setting for the throttle speed limit if C4=2 or C4=4 is chosen,

Limiting current or limiting throttle to some percentage of the display speed limit may be holding your speed down.

 

[KWR01]

I've got c4 to 0 now and c5 to 8 and its doing 26mph on a full charge. If I try c5=9 or 10, my speed drops between 22mph and 24mph. Could it be that I'm using a 48v 1500w controller on a 3000w motor compared to a 2000w controller?

 

[E-HP]

If I try c5=9 or 10, my speed drops between 22mph and 24mph.

Interesting/odd. Can you provide the voltage and wattage when riding at WOT when C5=8 vs C5=10?

 

[KWR01]

Interesting/odd. Can you provide the voltage and wattage when riding at WOT when C5=8 vs C5=10?

C5 = 8 is pulling roughly 950w
C5 = 10 is pulling roughly 600w

Both voltage dropping from 54v to 49v

 

[E-HP]

C5 = 8 is pulling roughly 950w
C5 = 10 is pulling roughly 600w

Both voltage dropping from 54v to 49v

Seems like maybe you're battery isn't keeping up. The reduction in speed compared to 26mph is proportional to the voltage sag that you're seeing. What are your battery specs and how old is it?

 

[KWR01]

Seems like maybe you're battery isn't keeping up. The reduction in speed compared to 26mph is proportional to the voltage sag that you're seeing. What are your battery specs and how old is it?

It's off my Super73 ZX. I've had it 12 months and I had done 900 miles on the battery

 

[docw009]

I guess I would be happy with 26 mph, but you can try a reset to factory defaults, and load all the C values over again, just in case the registers are mixed. Unlikely, but you never know.

 

[E-HP]

It's off my Super73 ZX. I've had it 12 months and I had done 900 miles on the battery

Assuming it's the stock pack, it has 5 parallel groups of unknown cells. You're asking it to provide a lot more power than it's designed for (750W/1350W peak or 16A/26A peak). If you're running full throttle with a 35A controller, it will probably die soon anyway (5v of sag at 600W is a LOT). I'd spend some time researching a more appropriate replacement pack for your controller and motor.
Do you have a link to the motor you're using?

 

[KWR01]

https://a.aliexpress.com/_EvdpMuF

This is the motor I have. I bought a smaller controller so could still use my bike as that's how I get to work. I've got a 72v battery coming in a few weeks

 

[KWR01]

These are the cells in the Super73 ZX pack

 

[E-HP]

These are the cells in the Super73 ZX pack

The pack should be good for 40A when new with those LG cells. The motor will run at around 2/3 of the rated speed when run at 48V.