Gen III on Trainer

[iRacing.com]

I have a Kurt Kinetic Road Machine, sent the info to by iBike. According to the power curve in the 3.06 the speed and watts match up pretty well except when going 20mph or faster.

Here is what I saw last night using built in Fat Burn Workout on the ibike.

Hovering a bit over 200 watts at around 17.5 mph lines up with what the software says it should. However, once getting to 20 mph or over, the watts start jumping all over the place. 22mph for instance, the watts actually decreased, that wheel speed on that trainer should show 325 watts. 20 should show 264 watts. Both the ibike speed sensor and the secondary speed sensor line up perfectly with wheel speed, so I had two devices measuring the wheel speed.

The short of it is, it seems like the ibike wattage freaks out and doesn't know what to do when reaching 20 mph. It's fine at anything less than 20 mph. It's like the Ibike can't process the data fast enough for 20 mph. Any ideas?

[racerfern]

I've got the same trainer using the same profile and don't have these issues. You might want to check your magnet alignment and make sure your resistance unit is tight up against the tire. I'm not where I can post a screenshot but the power graph is very smooth (relatively speaking). It's amazing how difficult it is to hold any given speed to within a tenth of a mile per hour when you get up to higher speeds.

[iRacing.com]

Resistance unit is tight, it really doesn't matter if their is resistene or not, just spinning the tire at a certain speed would produce watts. Speed is consistent 22.5 mph cadence consistent 100, what is not is the Watts, which get to 235-240 and start dropping and going all over the place. A couple tenths above 22.5 shouldn't make the ibike read 175 watts, the 220, then 235, then back to 150.

According to the coieffcients, the ibike should read around 264watts at 20mph. As I said before, anything under and it's dead on give or take a couple of watts. 200 and over is where the issue starts.

I'll replace batteries in everything and check it next time. Getting consistent speeds and watts on a ride at lunch today. Both the garmin and ibike report same speeds on trainer and outdoors. Also, battery in iBike was new at 298 volts on screen when turned on. Perhaps it has something do with being the workout mode vs not.

I'll check for the same behavior not using a workout in the ibike, just doing a trip reset and starting as if I'm riding outdoors.