A freind of mine and a fellow racer bought that same Kestrel unit several years ago, he was amazed when he found out how much the humidty changes made on his cars performance
![](/ubbthreads/images/graemlins/shock.gif)
I have compared my old, cheap analog gauges and a used Performaire Eclipse unit I bought to his unit, theey where close to each other. You will neeed to take your new unit to a known accurate weather station location and set the unit up before using it. I recommend taking it to a airport that has either a weather observer on the field or to a airport that has a AWAS (airport Weather Observation System) or ASOS system station (Sorry, I don't remember what that acronym stands for now
![](/ubbthreads/images/graemlins/shruggy.gif)
) It is a automated weather reporting system also that is availble to pilots by remote use on a dedicated radio channel
![](/ubbthreads/images/graemlins/thumbs.gif)
The airport people should be able to allow you to listen to it, if not ask them for the phone number of the unit
![](/ubbthreads/images/graemlins/scope.gif)
Try and get their weather information from 10 minutes before the hour to 10 mintues after the hour, they update the weather once a hour between 15 mintues and ten minutes before the hour, every hour. Most of those stations have a phone number you can call also
![](/ubbthreads/images/graemlins/scope.gif)
Good luck
![](/ubbthreads/images/graemlins/thumbs.gif)
I have had a weather station for a long time, my first one was a dinosuar compared to the new units like the TAG, Permaires, Kestrels and all other ones availble now
![](/ubbthreads/images/graemlins/thumbs.gif)
The main thing I have learned is to look at the weather changes(and write them down in a log format along with the times slips) and what happens to the cars performance, you will see a trend after a while and learn how that affects the car
![](/ubbthreads/images/graemlins/boogie.gif)
Outside air temps, humidity, barometric pressure and track altitude all have a affect on the cars performance
![](/ubbthreads/images/graemlins/scope.gif)
High humidty, hot temps and high altitude tracks all hurt the cars perforamnce. Dry humidty, cold air and low level tracks are the best set up for going fast
![](/ubbthreads/images/graemlins/grin.gif)
Lean is mean, fat is slow
![](/ubbthreads/images/graemlins/whistling.gif)