Did some testing today with shuttle mode set to high. If you recall the Velomotion test, they found that with 100 watt rider input the S-Works motor produced 406 watts (so about the official 400% assistance). That's without shuttle. I was able to max out the motor (680 watts on the display for 3.1 motor) with less than 100 watts. The number jump around a bit, but I think around 80-90 watts rider input is enough, meaning the assistance is around 800%. About the same as DJI.
Only the normal eco, trail and turbo modes are affected by shuttle. Auto, microtune and dynamic microtune stays the same. This is confirmed in the motor tune in the app and display as shuttle mode is unavailable if one of those modes is selected.
Here's a pic of the burnt gold color:
Only the normal eco, trail and turbo modes are affected by shuttle. Auto, microtune and dynamic microtune stays the same. This is confirmed in the motor tune in the app and display as shuttle mode is unavailable if one of those modes is selected.
Here's a pic of the burnt gold color:






