Recently I made a workout, with as goal a steady z3 exercise. I set the required power to 90% of my FTP (265 Watt), as 90% is often cited as the threshold for a z3 training. And that seems correct when you look at the numbers: the threshold between z3 and z4 is 275 Watt for me (according to Strava).
When running the excercise it did give me a target of 265 Watt, but in erg mode the resistance was concistantly 288 Watt. This seems to be so for all target levels, actual Watts in erg mode are 7% higher than asked for by the excercise.
So my 90% FTP training became a 96% FTP training, and something complete different from my intention.
I ride a Tacx Genius Smart.
First question: is this a Tacx issue, where the intent is to set the watts required to 265, but due to communication failures it goes to 288? Or is it a Zwift issue, where a required 265 is set to 288 just to make sure you dont drop to low?
Second: is there a way to correct this? (Other then fudging the FTP or the % required - it would be odd to have these values, and then use others to set up the excercise).