Jeff, if my memory serves me right, Don has the early MkI Pie with the longer crossed spokes, so he will need 130mm spokes instead of the 110mm MPII spokes that I suspect Gary now sells:
The early Pies were not as quick or as powerful as yours because of the lower Amps that the standard internal controller delivered
(anywhere between 10 and 30 Amps Max depending on how fortunate you were with the controller you received) Also, Don is using sealed lead acid batteries, so his voltage is likely to sag dramatically under load as well.
Lower Voltage + Lower Current = Much Lower Speed.
Your MPII is bound to be a lot quicker, as it's powered by a Lyen 18FET controller which is running off a 48V 20AH LiFeP04 battery!
My original Pie was not very impressive
(even with a high current LiPo pack) as it would only just reach ~20 Amp Max Current, so I decided to carry out a
dual controller conversion on my motor, which was not very successful.
After removing the damaged second controller and increasing the thickness of the shunt it was instantly transformed into a really powerful motor which I used for almost 12 months until I unfortunately broke it again while performing
the ultimate stall test:
After I repaired it
(and modified the shunt even more) it was absolutely amazing, but only for a relatively short time before it finally gave up the ghost completely:
Having experienced what 4kW can do to a lightweight pushbike, it's very hard to make do with a standard controller again.
I'm still considering running a single internal controller with an additional sets of FETs on the spare heatsink for a long lasting power increase.
Alan
