C3H8 -
Interesting mod. With my previously unheated 02 sensor my car takes about a minute to go into closed loop :
My cold start water temperature (FWT) didn't have far to go. It started at 69 degrees F in the video and the ECU/PCM went to closed-loop at about 82 degrees F.
I have since switched to a heated 02 sensor, but that's mostly for engine-off at stoplights + already-hot water temperature conditions.
CarloSW2