16 — H
OT
R
OD
C
ALC
™
USING THE HOT ROD CALC
Note:
The
Hot Rod Calc’s
built-in horsepower correction
calculations are based on formulas designed for naturally aspirated
gasoline burning engines.
The
Hot Rod Calc
helps you get the most out of your bracket racing
efforts by assisting you at the dragstrip in two very critical ways:
• Calculates the air density index, based on your current local
measured weather inputs, to assist you with changing your
carburetor jet settings.
• Calculates a horsepower correction factor, based on your
current local measured weather and/or track elevation
inputs, to assist you with predicting changes in your engine’s
performance enabling better ET and MPH predictions.
To further understand the
Hot Rod Calc’s
outputs and how to use
the calculator, please get familiar with the following technical and
weather related terms used throughout this section of the user’s
guide.
Important Terms and De
fi
nitions
MSA*
Motorsports Standard Atmosphere, MSA, is a term
defined by Drag Racing Pro’s Patrick Hale, and is a
methodology implemented in this calculator. Simply
stated, it is a standard, reference set of ambient weather
conditions. Engine and race car performance can be
corrected back to MSA in order to understand the affects
of weather changes.
As a rule, if the local weather changes, so does your
vehicle’s performance. Some basic guidelines to know
are that the higher the absolute pressure, the faster
your vehicle will go, but the higher the temperature, the
Summary of Contents for Hot Rod Calc 8703
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