I have the Tacx Vortex and just recently bought a stages power meter. This is an older thread but it's something I'm dealing with now. In the end I am not super worried about it, as long as you have a power meter, the vortex is really only there for erg mode and all numbers should go off what the power meter says, at least thats how i look at it. What I noticed is that for the first 10 minutes or so the power is pretty close then once the vortex is warmed up it is about 15-20% high, I assume this is why most recommendations say to warm it up before you do your baseline calibration on the Tacx app. I have been using a vortex for a few months and recently got my first real power meter.
JustTooFarr wrote:I have noticed something similar with my Vortex. This would be the easiest approach giving you the greatest consistency between trainer and outdoors.
The other solution is to allow your PM to control resistance of your smart trainer. Using this approach worked for me, and I find my power closely parallel between PM and Vortex Smart (.except when on a steady reduction of power then my Vortex is always higher). It's my guess that you could increase contact pressure to bring your trainer closer to what your Quarq output is. Reducing contact pressure (towards 'too tight') should speed up the trainer rather, thereby increasing predicted power readings. Increasing contact pressure (towards 'too tight) should slow down the trainer a little, thereby reducing predicted power measurements. My solution was to adjust tire-roller pressure:
#TACX TRAINER NEO SPINDOWN FREE#
I don't know exactly how the vortex (or most smart trainers) calculate power, but I 'think' that we have to keep in mind that the power numbers from smart trainers are 'predicted' power, rather than measured by any strain gauges (.please feel free to correct me if you know more specifics). I have a vortex too and initially experienced similar issues. Once you complete this, as long as you use the same tire and air pressure, then you should not need to calibrate for a couple weeks. Once completed, use the Tacx Utility app to perform the calibration and set roller tension to get a result that is to the far right of the green zone then reduce tension by 4 to 4 1/2 turns and use a Watt-Time style training mode to compare Vortex watts to powermeter watts and further adjust tension to close the gap in terms of wattage disparity. Some have advocated warming up the trainer with a no/low resistance ride of 7-10 minutes during which speed is kept relatively high. If you are concerned about the Vortex power output aligning with an external powermeter, then it is probably best to set aside 45-60 minutes to work with the calibration process in order to attain the most accurate results. While it is not necessary to perform a calibration (spin-down) before every trainer ride, it is important to warm-up the trainer tire before hand as the tire/roller interface suffers from thermal drift over the course of a workout. Jhanley wrote:I calibrate it before every ride however I haven't allowed it to warm up yet.Keep in mind that when you start a trainer ride, friction between roller and a cold tire will be at its highest, resulting in the largest discrepancy between trainer and external powermeter.
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