Raceair Weather Station calculation question

[Todd Renaud]

Just got a Raceair Pro to help with jetting. I keep hearing about a "Corrected Altitude" as the value to use on air density (such as in a jet chart) and that the Raceair measures this.

Am confused though. Is the "Density Altitude" figure displayed the one I need or do I need to multiply it by the "STD Correction" value to get the actual corrected value?

[Jim McMahon]

Have you read the guide? http://www.mpsracing.com/instructions/Computech/1000.pdf

Usually the std correction is used for dyno runs. If you already have a jetting chart then its the density altitude that you are looking for and you can ignore prettymuch all the other info. If you want to make your own jet chart, ADR# is the easiest to run calculations for, assuming your jet sizes are based on the diameter of the hole.

Hit the track, tune your jetting as you would normally. Note the ADR # for each session/jet.
Once you are happy with the jetting, note down the jet size and the ADR.
This is your baseline.
Let say your baseline was a 152main at an ADR of 92.7

You go to the track the next morning and take an air sample and it 98.4, you would run the "tune up tool", enter your base ADR of 92.7 and jet of and 152, import the current weather data it will tell you the correct jet for those conditions. Probably something like a 156 or 158.
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[Todd Renaud]

Thanks. That's what I was looking for and while I had read the manual, was stuck on the "Corrected Altitude" term. According to Computech: