Andrea,la recensione è molto ampia e dettagliata ma non affronta o almenolo fa molto marginalmente, la questione del valore di potenza espressa dall'i-Genius (+15/20%) e questo per chi si allena con la potenza rappresenta un problema.
Along the bottom is my current information. Speaking of which, based on what Im seeing while the power is consistent, it seems to generally read high (based on three other power meters on my bike). And cadence also reads slightly high. This could potentially be tied to an issue with calibration, though, I followed those steps as best as the system would allow for.
Finally, I found that the system reacted fairly slowly to shifts in power. In the above section you can see how I set it and forget it for 240w. I was doing some mixed higher cadence stuff, where Id burst up for 30-seconds. It would take about 15-20 seconds until the trainer would fully re-stabilize on the wattage back to 240w. During this stabilization phase, the unit was slow by upwards of 200w.Typically on most trainers I see this happen within 2-5 seconds.
Ho già evidenziato al supporto Tacx le mie considerazioni ma non ho avuto risposte soddisfacenti, anzi non mi rispondono nemmeno più. Allegate un paio di prove che ho fatto e le considerazioni inviate a Tacx.
Dear Tacx Support,
I understand what you said but what occurs still remain a problem for the correct execution of my training. Moreover using TTS4 with FTP functionality with power values in excess makes that functionality completely useless.
I recently bought i-Genius after having broken my Bushido (it was my fault this break).
The Bushido power measurement was really good, I believed that doing an up-grade with the i-Genius would have been the right choice but now I really dont know how to deal with this problem.
Furthermore Im doing more tests on the i-Genius and I have noticed that at the beginning of the training session (in the first few minutes) the power is lower than the Power Meter (P2max or PT), after 5 minutes they coincide and after 7 minutes the power starting to be much higher.
In conclusion I suppose that the power measurement is influenced by the temperature of the brake.
I dont think is possible to adjust this problem with a scale factor because the power surplus measured is not proportional with the power output but it remains constant during the training. I have noticed that during low cadences (50rpm) and powers around 280/300 watts the power surplus measurement is lower, reducing in this way the error (see attachment).
I have seen that the cadence is always more 4/5rpm respect to the effective cadence. Is the power output calculation influenced by the cadence? Could it be the cause of the wrong power calculation?
I know that others athletes that use i-Genius noticed the same cadence problem.
Moreover I have seen that
Time Capsule (802.11n wi fi Hard Drive - Apple) disturb the communication between ANT+ with TTS and very often the disconnection of the brake happens with subsequent problems in the initial calibration of i-Genius.
Thank you in advance for your answer,
Best regards