nutnspecial
10 MW
Skee, could you confirm your final choice of sprocket sizes, voltage, and top speed please?
nutnspecial said:D7500 has 66,65kV and 48,45Nm
other motor has 69,64kV and 26,5Nm
Wow that seems a pretty dam good increase for just a couple pounds of motor!!!
Imo it's too bad the bigblock and apparently (looking for confirmation) the d7500 have around twice the kV of BHT.
Low kV means you can get more power/energy from the voltage side of equation, which better suits the lighter motors imo, and also you can charge a HV battery of same WH much faster at recommend C-rates.
But still- it looks nice! Glad I found it for ya hahaha, keep up the good work!!
PS Izeman, watch for my new klein build. . . You will love it as a mid direct drive I think- the newer frame/geometry is quite nice to our old ones!
nutnspecial said:Skee, could you confirm your final choice of sprocket sizes, voltage, and top speed please?
skeetab5780 said:Ktm runs 300volts!!
madin88 said:skeetab5780 said:Ktm runs 300volts!!
because power is Volt x Amps only the product of both matters
kV should be determined WITHOUT load, because under load the RPM will drop.nutnspecial said:Seems like if bht did 35mph on 12/60 and d7500 does 41mph on 14/60 they are nearly identical kV ? ? ? ?
/// oh my bad you're running 13t for 41mph now, so ~9% taller gearing and ~18% greater speed.
Right and that has gotta be what we're seeing here. Double kV (if this is definitely BHT and not bigblock VS d7500), plus taller gearing should be going >70mph with adequate amperage!!because under load the RPM will drop
I am going to get my batteries mounted in and try a good trail ride with this thing at 18s 24ah 12t/60t and see what I think before I waste time changing the rear sprocket, but if I want more power that will realistically be the only solution for me and this build. I doubt I will get into a two stage reduction...by the time I finish it they will have better technology out
If it would have lower kV it would just meen that it needs more volts and less amps for doing the same.nutnspecial said:That's a huge sprocket, when I wonder why can't the motor be a lower kv?
skeetab5780 said:That silly d7500 pit bike from china on indiegogo is advertising thier bike goes 62mph top speed on 72v
I wonder what ratio they are running, it must not have much torque geared like that unless its pulling 200amps