Turbo Vado 2 4.0 or 5.0 or 6.0?

[mcdenny]

here’s the one that’s most handy, it’s actually closer than i thought ! i should find the xls. the gold is the ratio between rider power and motor power, at four different assist levels with max set to 100% to avoid hitting the limiter, so to speak. at the time we believed that it was always supposed to be 2x the support factor, and that the measured value was electrical power, and the motor was 80% efficient at these optimal cadences. you can also see how spiky the data is (the thinner gold line) which is pretty typical of any power measurements on a bike, no matter how smoothly and consistently you try and pedal. spec’s algorithms probably have all kinds of smoothing.

if you track the red and blue (rider and motor power) and unsmoothed gold, there are often spikes in the support factor when rider power increases, and then sometimes it drops back down. might be related to the responsiveness of their algorithms and controllers scaling up or down.

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How did you get this data? I’m envisioning myself audio recording myself reading motor and rider power of the display while I ride. It looks like you were able to capture much more granular data.

 

[mschwett]

How did you get this data? I’m envisioning myself audio recording myself reading motor and rider power of the display while I ride. It looks like you were able to capture much more granular data.

it’s been a while. everything but motor power is in the data file you get from mission control (or whatever it’s called now lol) that can be parsed with anything that reads XML, which is basically anything. i probably used excel. there are also lots of free converters for FIT files and the other associated formats.

the motor power is more annoying, specialized obviously saves it because you can see the stats in their cloud, but if i remember i made a screen recording and used a video to text tool to grab the motor power field and export it as a CSV.

today you could just upload the screen recording to gemini and ask it to make a spreadsheet with the fields you want at one second intervals. i did this a while ago and it worked perfectly on the first try

 

[Jeremy McCreary]

today you could just upload the screen recording to gemini and ask it to make a spreadsheet with the fields you want at one second intervals. i did this a while ago and it worked perfectly on the first try

Miraculous!

The good news: First thing I want to know is if mechanical motor power Pm really is linear in rider power Pr at constant E and cadence before saturation. If the TCU's "power ratio" (Pm/Pr) field stays constant under those conditions, linearity is confirmed!

Suppose you ride through Prs, the saturation point, with ever-increasing Pr at constant E and cadence. After constancy up a linear ramp, Pm/Pr should fall continuously as soon as you cross Prs.

This might even be a way to get some rough empirical Prs values for my SL 1. My Pm model predicts constant Prs = 133W any time E = M.

Easy enough to check all that in a few flattish neighbor laps, just by keeping an eye on the right TCU page.