User guide

HOT ROD CALC™ — 29
Notice within the ET output sequence, the ET predictions are
displayed in 1/4 and 1/8 prediction sets based on current track
conditions as well as a HPc of 1.202. Each set displays the
horsepower corrected predictions (HPc) followed by the MSA
adjusted predictions.
Repeated presses of

will toggle back through the inputs and
outputs, starting with vehicle weight.
Display the entered MSA HP, corrected HP, and the calculated
Horsepower Correction Factor (HPc):
KEYSTROKES DISPLAY

HP S MSA 411.

HP 341.92

HPc 1.202
Repeated presses of [HP] will toggle back through the inputs and
outputs, starting with absolute pressure.
Note: Recall from the key definitions for Mechanical Efficiency
(ME%) that ME% is a numeric value representing a percentage
of the power available inside the engine’s cylinders that makes its
way to the flywheel (e.g., friction losses from rings, pistons, bearing
friction, oil pumps, etc.). The default value is 85% which is a fairly
acceptable value in practice. ME% is a variable in calculating the
HPc, and can be changed as in the following keystroke example.
Change the Mechanical Efficiency value from 85% to 80%.
KEYSTROKES DISPLAY

M-EFF S 80. %
To see the change to HPc, recall the HP value:
KEYSTROKES DISPLAY

HP S MSA 411.

HP 339.44