Didier,

All turbines are affected with the temperature, altitude, humidity, etc. The evoJet allows you to fine tune your engine to run at optimum performance no matter what the weather. I really doubt you will even notice that much of a difference. As far as a response from the factory, they were out on vacation this week and will be back in the office next week.

Hopefully we have found your solution. Good luck and have fun!

Chad