According to the TR website and the TR app, my Tacx I-Magic trainer is supported. This is a dumb trainer and is wired to a PC running Fortius software. It works well, except that the power displayed by Fortius and the power displayed by the TR app are different. I know some difference is expected…

Do you have an independent source of power measurement or are you using “virtual power” with a speed sensor? For what it is worth, I have a Tacx Flow T1682 which is basically the same as the I-magic, I think. Tacx used to sell an upgrade kit which replaced the yellow head unit for my turbo with the…

[image] neil: Below 150W the Flow reads high, above 150W the Flow reads low. But that shouldn’t be the case, right? If TR supports the specific trainer is because it has the power curve for that trainer so both TR and Tacx should be following quite closely one another. At least this is what…

Well, TR have a power curve for that trainer because a few years ago someone sat with a PowerTap (or whatever) and measured power at a certain combination of resistance/ speed to produce a curve. That doesn’t have to match what Tacx thinks the power is, and displays on the head unit/software.

That’s interesting at it means that the power TR shows would be more accurate than what Fortius shows? Do you know how to reconcile the 11 Levels in TR with any settings in Fortius? that would be very useful to know.

Well yes I’m more inclined to believe what my Stages shows me than what Tacx is displaying. The Stages is measuring strain at the crank but Tacx are calculating based on the resistance and how fast they see the flywheel spinning, but there are many assumptions there that could affect that calculati…

[image] neil: I’m more inclined to believe what my Stages shows me than what Tacx is displaying Does TR match fairly accurately the power measurements from your Stages meter? I don’t mean exact numbers but maybe a fairly constant offset? If so, would you mind sharing what Level you have sele…

Hi @Wouter_Tacx_Fortius , I’ve had a look at your code and I understand you need Python to run it? Whilst I have a look at how I can use it I have a question, which is how this thread started. I now understand a little better how the trainer works so I can be more specific. I understand internall…

Hi mon269 Installing python, the required modules and activating FortiusANT is not difficult, I will check whether the wiki is clear enough. (github … FortiusANT/wiki) I know that antfier works with 14 levels in it’s powercurve definition and I expect that that is based upon another trainer than t…

Please post further questions on the github FortiusANT page, since it appears I’m not allowed to put links to github here.

Equipment calibration - Tacx I-magic and Fortius

Equipment

neil February 20, 2019, 4:45pm 8

TrainerRoad uses the data from my Stages as the source of power, so yes, they match as they are the same thing.

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Equipment calibration - Tacx I-magic and Fortius

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