It maybe isn’t related but my Favero Be Pro S was consistent for 3 or 4 years and then it became erratic. I figured out what it was though, I had a bike fit and it had put me in a marginally different position and I was now on occasions touching the pod with the cleat. I subsequently trimmed the cleat slightly with a blade and they’ve been consistent again for the last 2 years.
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I’m also seeing odd behavior. I’m suspecting temperature compensation might explain some of it, as noted by @kevistraining above, because I often calibrate after taking the bike out in the cold, or vice versa.
I’ve had my Uno replaced before, but that was due to a constant underestimating of 40 W. This time it’s different.
Yesterday, I tested the pedals against my Tacx Neo. Before the ride I calibrated the pedal using the Favero app. The bike was mounted upright on the trainer, the cranks where oriented vertically, and I was not touching the bike. When I started the ride the pedal was reporting 150 W when resistance was very low and the Tacx reported less than 100 W. I stopped and did another calibration in exactly the same way as before, and after that the pedal reported correct data.
You can see the power data here: https://zwiftpower.com/analysis.php?set_id=240397
On March 23, I climbed a hill, and the pedal reported an average of 293 W for 32 minutes. This is more than I have ever managed, and I’m not even in my best shape yet. Two years ago I did the same climb more than 4 minutes faster at just 286 W. According to bikecalculator.com I would need to be 17 kg heavier to explain the 4 minute difference, and I’m not. Even if I could have done 293 W, my heart rate would have been much higher. After 18 minutes it had not exceeded 170 bpm. When I did intervals at 280 W yesterday, my HR reached 177 within 7 minutes.
You can see that ride here: https://www.strava.com/activities/6870478921
On February 28 I suspected something was wrong. I had already stopped and calibrated several times. On a flat stretch I pedaled slowly at 8 km/h for 45 seconds. Then I returned, re-calibrated, and did it again. The first time I averaged 106 W, and the second time 68 W.
UPDATE: I did another test today, 90 minutes indoors with a steady temperature. I calibrated the pedals before the workout, as well as every 10-15 minutes. The pedals tracked the Neo well all the time, except for after the very last calibration.
Between 1:11:00 and 1:15:00 the difference in average power was a half percent. Between 1:18:00 and 1:22:00 the difference was more than 4%.
All the data is available at ZwiftPower - Login
Ugh, not even sure where to start. Mine are out of warranty now, and they’ve started to show L/R balance that heavily favors the L (60/40ish), which tends to translate to lower power than I’d expect. I’ve been back and forth with their support and done the static weight test. A few times they’ve said there were “strange” readings from the right, but they couldn’t point to anything. I’m a little stumped about what to do now.
Hey Wirt, where you able to fix this somehow? Having the same issues with my Faveros - ofcourse they are also outside of warranty… Pretty frustrating.
Maybe completely unrelated but I found my older Favero Be Pro S went erratic when I changed to the Keo cleats. After a bit I realised what it was, they were skiffing the pod so I had to marginally trim them down.
Just to give an alternate view. I ordered my Assioma’s in July 2019 and they’ve been pretty much flawless ever since.
I’ve run them over 5 bikes swapping multiple times per week, and still good.
Even survived getting hit by a car, and still match up with a Power2Max on my gravel bike
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I’m trying to solve a 40:60 imbalance myself too (which had steadily grown from September 2020 when I got my assiomas from 46:54 (so quite acceptable) to 40:60 (way too high) by January 2022). Some things that might have contributed: slightly oneven setup of the handlebar and hoods and cleats (check that they are mirror imaged) and a saddle slightly too high
Not exactly what I was hoping to hear. But it also makes sense in relation to my own problem. After an accident in 2020 and more intensive physiotherapy, my L/R balance had obviously improved in the process. Due to “lack of time” since returning to normal work, it has now obviously deteriorated so much that I almost hoped it was an assiomas problem.
Thus also an approach for you. Core & stability exercises!
These have obviously helped me in the past.