Ok, that's about the only way I can describe the experience I just had. Yeah so 125V, and 102A battery / 74A phase fed into one of these motors with a 21.5" tire is total holy crap territory (*edit 95% sure on the amp settings now that I found the correction factor for my shunt mod*). My bike has a swing arm that has been extended 8 inches / 20cm and looks like this
and from 26mph (40% throttle) if I flip the switch to position 2 (70% throttle) the bike will pull the front wheel off the ground for over a foot and carry it about 20 feet if I'm not leaning over the handle bars! Leaning over the bars it will still pull the front wheel for a few inches for a couple of feet
! The first power wheelie actually scared me because I just wasn't ready for it.
This thing is a suicide machine at these settings if I'm not careful. Going to be doing some tweaking for sure. For the first time ever I got my 18 FET 4115 controller warm after playing around on these setting for about 4 miles in the neighborhood doing some low and high speed abuse (I'm just asking to pop an FET, I know). I'm going to back off the settings so I can get video this weekend before I hurt my controller.
You guys with 24" and 26" wheels will have zero problems with torque. I rode back to back on the same settings with my 9C 2806 then with this beast installed and it's a HUGE difference in power. Top speed seems about the same but I'll have to wait until daylight in full safety gear with GPS to check out how fast this thing really goes. I got to 55mph on several of the streets with room left to stop and none of them are longer than a 1/4 mile. I'll double check my top speed with GPS but it was within 1mph previously with this tire.
I might have to rephrase my amp settings because I'm on the 2nd phase of calibrating my shunt after adding a piece of 12 awg copper in parallel to the 3 shunts already installed. First calibration put me around 0.53 mOhms, batteries are charging now so I should have a better idea of what the shunt is. I'm probably going to remove it for more granular control since without it I was around 1.2 mOhms but installed it for trouble shooting purposes to see if current limiting was causing me a problem.
This thing is epic.
Video can now be seen in this threadhttp://endless-sphere.com/forums/viewtopic.php?f=6&t=35925
Greyborg Warp Frame with Greyborg Cromotor aka "Monster Bike
", 24 FET IRFB4115 EB324 Top Speed 42MPH (75V)
Greyborg Hub Motor, ZombieSS 24FET/36FET IRFB4115, Customized full suspension kids MTB. Top Speed 61 MPH (125V)
9C 8x8, 24S2P LiPo, Lyen 12 FET, Diamondback Recoil Comp. Top Speed 42 MPH (100V)Greyborg USA/Canada Dealer, Frame kits + motor in stock now http://www.greyborgusa.com