Using The Hot Rod Calc; Important Terms And Definitions; Motorsports Standard Atmosphere - Calculated Industries Hot Rod Calc 8703 User Manual

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 Definitions
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
16 — H R
OT OD
C ™
ALC