we know that even the same model trainer can have differences in resistance. I propose there should be an adjustment to account for this. We should be able to adjust zPower by steps (+3, +2, +1, 0, -1, -2, -3) kind of like exposure adjustment on a camera. Or have some kind of power adjustment number we can enter (eg. -20W)
For my personal experience, I feel like my zPower is too high. I go too fast in the game when compared to my data in real life. I get around the problem by increasing my in game weight, but this is a very crude work around. I would like to be able to subtract a certain value from my zPower to adjust for the variance between Zwifts power values for my trainer (Blackburn Tech Fluid), and my actual trainer.
Another use case for such a feature is that you could use the adjustment to handicap yourself when riding with a friend who is an absolute beginner. So instead of having to ride slowly with a friend like in real life, you could simply slow yourself down virtually so they can keep up.Â
OBVIOUSLY there would be concerns with cheating if people add zPower instead of subtract. Perhaps we could allow only downward adjustments to zPower
It sounds like youâre not using the trainer that youâre selecting from the trainer select menu, correct?
zPower is calculated based on specific variables, including the resistance unit. If youâre using a trainer with a different resistance unit, youâre not going to get accurate numbers. You canât choose a trainer thatâs âcloseâ to your actual trainer and expect accurate values. Itâs apples and oranges.
In this case, you should use the âNot Listedâ trainer option or consider a power meter/smart trainer if youâre looking for more accurate values. If youâre using a trainer thatâs not supported, you can also submit a support ticket and request that we add it. Thereâs no guarantee that we will, but it helps us gauge demand and prioritize adding new trainers accordingly.
Iâm sorry for the confusion on my part - it sounded like you were using a different trainer than the one you were picking.
We havenât heard of significant power discrepancies between the trainers we test with and ones out in the field from manufacturing variance. If you feel your real-life numbers and your ones in Zwift are significantly different from what youâre seeing, let me know how big the gap youâre seeing is.
While we may consider an adjustment similar to what youâre suggesting in the future, Iâd like to see if thereâs an error in our calculations now (keeping in mind that zPower is estimated, so there will always be some variance).
I have no hard numbers to back up my claims since I have no real power meter. Itâs just a hunch I have. Iâm flying down the road at 40km/h in game, and iâm not working nearly as hard as I do hitting 40km/h in real life.Â
My climbing speeds in game are fairly close to real life, but speed on the flats seems at least 5km/h too fast.Â
Not sure if my request is the exact same one, Iâm personnally using a non supported rollers set (Tacx Antares + speed/cadence sensor) , so I am using the âunlisted rollersâ option. I clearly think that my power in Zwift is overestimated by at least 30%, and so far my only option will be to overestimate the wight of my avatar by the same factor but I do not like too much that idea ⌠I am clearly not ready to invest into a different supported trainer, or into a powermeter, so I would vote for this requested feature to fine tune the power estimates manually to ensure the virtual ride is as accurate as possible.