[ITZREAL]

I use a lot of freeware and some payware aircraft. Some of my freeware aircraft have unrealistic turn rates. For example, if I'm flying a small jet, and I normally would expect a turn rate of say 25-40 degrees, sometimes the freeware aircraft turns at a much higher rate under auto-pilot. I have had some instances where if I enter a new heading a more than 40 degrees change then the auto-pilot would bank the aircraft at an unrealistic angle. This would and has caused problems. I usually switch off auto heading and manually adjust heading in small increments to achieve my desired heading. What can I change in the freeware Aircraft CFG file that would adjust the max turn rate? Is there a guideline for proper turn rates for an aircraft?