I attempted to do an 8min FTP test this morning. The first thirty minutes or so was perfect. As I started the first 8 minute interval, I shifted into a bigger gear and tried to hold 250 watts. I would hit 250 and slowly the power would drop. It went down to something like 190. I shifted again and hit somewhere near 250 and then it fell off again.
At this point I stopped and checked my settings. I had the system setup for resistance at 6% (whatever that means) so I switched to erg mode. The same thing was happening, up to 250 and then down to 180 or so. I tried resistance at 0% and I couldn’t even hit 250. I stopped at this point. I’m guessing I was supposed to set it to resistance 100% or something but at that point I was frustrated and decided to try again another day.