I have a KU63 controller (3 speed switch version) that replaced the defective stoc controller on my eBike. The stock china controller was drawing 15A thus reaching the system's intended wattage and a legal speed of 25 Km/h (27 with newly charged battery but still within tolerance).
The KU63 shuts down at 12.85A thus giving me less acceleration and a top speed of 20 Km/h (with full battery i.e. max wattage)
I want to get 15A out of the KU63 and I implemented this very mod http://www.avdweb.nl/solar-bike/electro ... or-current
for increasing motor power, soldering different values of Rtune between the terminal of R45 (2k) farther away from the shunt and negative ground.
For some reason not one of the Rtune values I tried at first (27k, 10k, 6.8k, 2.2k) changed the power drain in the slightest (i.e. no effect). I measured the power intake by a Turingy power meter.
I tried 1.5k then and this increased the current by 0.9A to 13.75A
Next I tried 820 Ohm, but it seems to flatten out. I got the same Apeak 13.75A.
I checked the Throttle voltage: supply voltage for the hall sensor is 5.3V. No-throttle voltage output is 1.2V and full throttle voltage is 4.9V . Seem all right
I bridged the shunt with a heavy gage copper wire. I got an current intake of 30.53A at full throttle and full load, so there is no external limiting factor.
Am I understanding something wrong, or what could be the problem?
Any thoughts would be greatly appreciated.