Turbo Vado 2 4.0 or 5.0 or 6.0?

[mschwett]

A short progress report:

Here's how often a record occurred for a particular cadence. 0-10 have been deleted. (O was far and away the most prevalent cadence - coasting)

View attachment 206241

In my ride analysis I'm going to use data for cadences 50 to 90. Eliminating the tails will make the slope and P saturation levels more clearly visible in the plots of actual Pm mechanical vs Pr.




Here's how I got the function relating efficiency to cadence

View attachment 206244

Note the table,
cadence and mech watts are read off the Spec chart.
Electrical watts are the trend line of Pm max values from my data several posts above. Pmax = -0.62 * cadence + 439.
Actual efficiency is (mech watts/elec watts).

The blue line with data points is actual efficiency.
The red curve is a polynomial trend line. You can see from the difference column that it fits quite well.

In my ride data analysis I will use the f(x) shown on the chart to convert motor electrical power to motor mechanical power.

Does this seem right so far?

cool

my guess is, however, that the system is not 84% efficient at 100rpm. more likely it’s just not outputting quite the full 315/320 watts of mechanical power when the electrical draw is only 377w. i think specialized would be crowing about it a lot more if so

it’s very interesting that you’re able to get 420 watts of electrical draw out of the motor at 30rpm. i see you’ve got about 25 samples
there. have you tried to sustain 30rpm in a steady state with enough force to keep the power that high? of course the motor isn’t designed to work like this but i’m surprised how inefficient it is. what i would have expected based on the peak power curve from specialized is that at lower speeds you also don’t have as much power draw.