12
Aug

Data comparison

Written by admin. Posted in Build Diary

Here is the power and speed curve data of the electric e-MotoCRF250R Gen 1:

This is true SAE rear wheel power displayed.

Here is the quick comparison of rear wheel peak horsepower values:

CRF250X = 26 HP
e-MotoCRF250R Gen 1 = 33 HP
e-MotoCRF250R Gen2 = ~50HP (67HP @ engine out) – not dyno’ed yet

The torque is significantly higher in the electric that makes for excellent at off-the-line acceleration, so competing with gas bikes is now possible   

 The final weigh in with Gen1 prototype:  

CRF250X                 = 253 lbs  
e-MotoCRF250R   = 279 lbs
                                           —–
                                         26 lbs over

Well, with these outdated motors, it is more like the weight of the CRF450X … 

Despite this weight, you can clearly see the true acceleration from the dyno data. Considering the peak power from 25 to 30 MPH, this will truly be competitive on a tight track. 

We made a discovery after posting this dyno data and after our day on the track (see below): We later found all the fat copper lugs were getting so hot, it burned off the insulation around them. The thing that caught my eye was some dark color on one battery box cover that turned out to be charred FR4 material inside that was from a terminal bolt that was glowing red hot while full throttle. This is what happens if there is resistance in the current path and large currents flowing; power is dissipated (and wasted). No cells were hurt in the incident, FYI. 

So, because of that, the dyno data shows lower on the plot (above) than it actually is. Now that the resistive losses have been resolved, it will deliver more HP and now may exceed the 250X peak power, we will have to re-dyno to find out. Despite this wasted power, it performed very well on the track. Now it will perform even better and with more range than we reported below.

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