From my memory of a test flight in an AS350D, the RoD reached nearly 3000 fpm at 90 kts. I don't know whether that extrapolates to 4500 fpm at 131 kts.
The RoD on a textbook auto at 70 kts should be a lot lower at 1500 to 2000 fpm. We also performed a zero speed auto and the RoD was about 3000 fpm. With lots of height to recover, of course.