Direto power off by around 50 watts

[costantini24]

Hi
I have the same issue, my assioma is +50 watt more or less than my direto xr.
Already did calibration ps direto and put the same ftp level.
Is there something to do to fix it?

[fabien.wartel]

Good morning

I've had the same problem for years except that I have 20/30 watts more than my Power2max....

I imagine that since then there has been no solution or no response from Elite?

[dmwnz]

Same issue here, however while troubleshooting with Elite support, I noticed that the difference between the Direto XR and my other power meters (tried 2 including Favero Assioma Duo and Magene P505) was not constant, it would depend on the resistance level.

Overall the difference was about 7-10%, with the biggest gaps happening at high flywheel speed (40-45km/h). After long exchanges with the Elite Support, which at first tried to convince me that nothing was wrong, I loaded a new map that they sent me (EEprom JSON file). Now the overall difference is a bit smaller but when looking closely it is still very much wrong on many resistance levels.

For a product that is advertised "1.5% accurate", using an "internal torque sensor" it is extremely disappointing.

Note: during some troubleshooting, at some point, the actual resistance on the unit would not change when changing the resistance level through the myEtraining app... but still , the power reading would go higher as the "supposed" resistance was increased. To me, it is clear proof that the "internal torque sensor" is a total lie. The way the unit calculates power is barely the product of speed and resistance, put through a map. If the map is improperly calibrated (I guess that is supposed to be done during production, clearly not done well for a lot of units), or if the resistance motor doesn't respond as expected, then the readings are garbage.

I have yet to resolve the issue for good, it seems to me that it would require a complete recalibration

[stefan_l_01]

How do you know which powermeter is the correct one?
Accelerating hard out of low speed in long gear should show whether power raises before speed is build up.

[dmwnz]

So, in total I tested the Direto XR against 3 PMs (one for each Assioma pedal and one spider based). All 3 were measuring very close, only the trainer is off the chart ; there is little room for doubt on which is wrong...

I'm currently still in contact with support, I believe my unit was miscalibrated and hope I can get it replaced.