yep can run times only as RaceChrono doesnt need anything specific to run. It is highly recommended to get 10hz GPS for accuracy. vast majority/all phones are only 1hz with their GPS so no good.
warmest the cup2's got were barely hand warm and they look like i've not even been on track with 'em either. aimed for 33c hot (so road cold temps) and had to add more pressure throughout the day. dry/warm days seem to get about +8psi increase so i dropped 'em by 6psi to account for cooler day and wet. ended up adding 4psi around lunchtime as they just didn't heat up.