Just to report back on the previous issue. It turned out the trainer was working as expected. The advertising of: “the Direto simulates slopes up to 14” is a bit misleading, but still correct. It does 14% at 20 kph. Unfortunately I can’t do 20 kph @ 14%. At best I can get to 10 kph. At lower speeds, however, the resistance simulates much less than the advertised 14%. I was in contact with elite about this and they were very professional in in their response. They even provided me with graphs and formulas that explain how the direto calculates resistance for a given slope.
The only thing of importance for zwift, is that you have to know that when you ride on a real slope it will feel much harder than on Zwift. The ride result in zwift is still correct. Zwift simply uses your power measurement from the direto and calculates the speed you’ll be riding on the slope.
You could compare this to auto-shifting, where zwift will start to control your gear ratio: it is like the gear goes from 34x28 to 34x36 @ 67 rpm. Not realistic of course. The only way to truly simulate how tough this is, is by selecting a gear that will force you to generate 290W at 60 rpm for example. That way you’ll feel the pain of 14% at 8.7 kph with 34x28 gear ratio (34 front, 28 rear( and this is only for a specific weight of rider + bike.