Calculated Industries 8703 User Manual
Page 25
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For this example, the current local measured weather conditions
are 80° F, absolute pressure of 29.15 in Hg, and 53.5% relative
humidity. Your race car ran best, under these baseline conditions,
with #78 jets.
Calculate the Air Density Index (ADI).
First, clear the memory on your calculator, including temporary and
semi-permanent entries.
KEYSTROKES DISPLAY
ALL CLEArEd
1. Enter current local measured weather conditions:
TEMP S 80. °F
(Absolute Pressure)
P-ABS S 29.15 INHG
(Moisture/Relative Humidity)
RH% S 53.5 %
2. Calculate ADI:
ELEV S 0.
ADI 92.038 %
D-ALT 2813.209 F
Notice that the elevation output is 0 feet. This is because the
example did not include entering an elevation. Elevation is only
a required input if absolute pressure is not available. Record the
calculated ADI of 92.038% and density altitude of about 2,813 feet
in your log, along with your air/fuel settings and jet numbers. In this
example, these are your baseline settings for this particular track
location.
You are now at a different track location, and the current weather
conditions have changed significantly. The air temperature is now
60° F, absolute pressure is 24.72 in Hg, and relative humidity is 39%.
Calculate the current ADI in order to determine if an adjustment is
necessary.