You mean GP2Y0A02YK0F (range 20-150cm) ? I affraid 80cm is not far enough.
I was thinking to give RC enough time to stop, we may need something like Devantech SRF02 Small Ultrasonic Range Finder. That has max range of about 6 meters (20 feets, or 600cm)
Also, the sensor range that is given isn’t the most accurate sometimes. Although the response range of these sensors is fast, they really need to be filtered or something. you also probably want to get a long range model or something.
I guess it depends which project you are working with and what you need to do with the range, but for avoiding obstacles and that sort of stuffs, I dont need to it to be too acurate ,± 0.5 is probably accurate enough.
For this bug to go full speed…150cm is still a concern for me