Ok, so I’ve just done Revolver (Sufferfest) on Trainerroad which is basically warm up then 1 minute full effort, 1 minute recovery x 15.
I’ll have a look in closer detail when I get a bit more time but the power reading provided by the Powercal seemed to track the virtual power that trainerroad output. And it tracked heart rate too. Perhaps unsurprising for a system based on heart rate.
Its probably obvious, but in realtime it seemed to track a change in effort better than a steady state effort. The power suggested by Powercal dropped off during a period of steady effort – where in reality I was still pedalling as hard as the initial effort.
Not sure how useful it will be on a steady state ride because the reading fluctuates more than heart rate, so it would be easier to stay in a particular heart rate zone than to try and stick at a steady “power” output. Thats with the Garmin displaying a 30sec average.
I’ll try it on the commute tomorrow…