Fast Freddy,
I dont know what it is to be honest. My car was running just like every other viper 190-220, up down like a yo yo. Fans kick in temp drops, fans turn off they fly back up.
After we installed the AEM unit no one even noticed the temp till I started driving it home in LA traffic. And as usual just glanced at the temp guage several times, and noticed it was at 190 every time. So I starteed looking at it constantly and it never moved more than 5 degrees or so.
Called AEM and they had no idea this was a side effect, the only thing we can come up with is that the factory tune was crap, for whatever reason. Next thing I thought was that its fan constantly at hi speed, and it is not.
Hope this helps