Engine Horsepower
Engine horsepower, abbreviated as \(EHP\), is the estimate of engine horsepower after a quarter mile run using the trap speed.
Engine Horsepower formulas
\(\large{ EHP = W \; \left( \frac{ v }{ 234 } \right) ^3 }\) | |
\(\large{ EHP = \frac{ W }{ \left( \frac{ ET }{ 5.825 } \right) ^3 } }\) | (elapsed time) |
\(\large{ EHP = W \; \left( \frac{ s }{ 234 } \right) ^3 }\) | (trap-speed) |
\(\large{ EHP = \frac{ \tau \;\; s \;(RPM) }{ 5252 } }\) | (rotating horsepower) |
\(\large{ EHP_{change} = W \; \left( \frac{ v_2 }{ 234 } \right) ^3 \;-\; W \; \left( \frac{ v_1 }{ 234 } \right) ^3 }\) | (determine increase in horsepower) |
\(\large{ EHP_{change} = \frac{ W }{ \left( \frac{ ET_2 }{ 5.825 } \right) ^3 } \;-\; \frac{ W }{ \left( \frac{ ET_1 }{ 5.825 } \right) ^3 } }\) | (determine increase in horsepower with ET) |
Where:
\(\large{EHP}\) = engine horsepower
\(\large{ET}\) = elapsed time (time to finish quarter mile)
\(\large{ET_1}\) = initial elapsed time (time to finish quarter mile)
\(\large{ET_2}\) = final elapsed time (time to finish quarter mile)
\(\large{s}\) = speed
\(\large{ \tau }\) (Greek symbol tau) = torque
\(\large{v}\) = velocity
\(\large{v_1}\) = initial velocity
\(\large{v_2}\) = final velocity
\(\large{W}\) = weight