Cuellar1, There is some correlation between OAT and Nr...when it gets colder, we have to adjust it down a little bit...when it gets warm, we adjust it back up...we usually see a 5-7 RRPM difference...sometimes more, sometimes less. It depends on the OAT difference of course....we are in Austin, TX USA so our winter and summer extremes are not so severe....We usually adjust it when it cools down for good, and when it warms back up again in the spring...
Ryan