I have the Schwinn™ IC4 / IC8 and Bowflex™ C6 Bike. My power readings are too high for my fitness level. I contacted Zwift and they said they couldn’t help me because the bike was unsupported. (As stated in post below only the Schwinn AC and the Cruiser are supported.) Zwift also instructed me to use speed and cadence outputs from the bike in the meantime. I do not believe this is possible with the IC4.
I’ve called Nautilus, the parent company twice. The first time I got nowhere. The rep did not understand what power was and said to contact Zwift. The second time I asked more specifically how to calibrate the resistance knob/console. I believe this is where the problem stems from. They sent me calibration instructions via email. He was walking me through them and I couldn’t get passed step 3. My rep then said the engineer he consulted said that might happen and that I got a bad console. So they are sending me out a new console under the warranty. However, I’m still not confident this will fix the problem, but I’m hopeful.
So if you are having power reading issues you may want to call and request the calibration instructions. I’ll try to screenshot the instruction here. I’ve seen elsewhere that the console algorithm for watts may be incorrect and they fixed it in later releases of the console. I’ll check back in later if this fixes the problem of high wattage readings in Zwift.