I almost hate to answer this question because so many factors effect needle settings.

The short answer is just short of 1.5 turns, maybe 2 clicks less than 1 1/2.

My 50Sxh on the same fuel/muffler combo ran just over 1 turn open. I'm not surprised at the difference as the hyper has a bigger throat, so more air means more fuel, more power.

I'm running CP 15 percent with a stock TT muffler. I fly at or near sea level.

Just a recap, the following issues effect needle settings.

Fuel
Muffler
Density Altitude (air pressure, elevation, temp and humidity)
Gearing (though if we are talking R50's the gearing is identical)
Blades
Pitch/throttle curve
Cooling efficency (head, fan, airflow etc)
Phase of the moon, high or low tide and position of the out house relative to the front door all have some effect as well

So what runs well here in Jacksonville when its hot and humid with 15 percent may be a full turn or more different in Denver with a pipe and 30 percent even in the same heli/motor combination.