Adjust using real data after you get close. Battery Weight (in pounds): A typical battery is 65 lbs. Vehicle weight should include not only the vehicle, but also the driver, the passenger, and anything else of significant weight. This calculator computes the estimated engine or motor horsepower from trap speed. Compute estimated increase in engine horsepower when an after market, racing upgrade or performance part has been installed with ET. 0-60 mph calculator The underlying assumptions of this calculator are based largely on sample data from Edmunds.com, among others.Power to weight ratio is the primary factor, but it also takes into consideration the performance advantages of RWD and AWD over FWD, and the advantage of a manual transmission over an automatic. So that means that by taking 100lbs out of the 3500lb car, we would have had to gain ~ 6.38 hp (221.38-215, (the new-original horsepower) to accomplish the same thing WITHOUT taking out the 100lbs. This rich Internet app uses the quarter mile distance or 400 meter track. DRAG PERFORMANCE CALCULATOR. This calculator computes the estimated engine or motor horsepower from elapsed time. Although its original purpose was to compare the output of steam engines with the power of horses (hence its name), it has since been adopted as a unit of measurement for all sorts of engines used to power things such as vehicles, lawn mowers, boats, chainsaw, and airplanes. Note: This is a rough and quick estimate of engine horsepower. Horsepower Calculator From 1/4 Mile Stats: Wallace Racing BACK to Calculators These equations are for recreation only. Try out this calculator get a rough estimate of horsepower. Old weight (3500) / New Power-to-Weight Ratio (15.81) = 221.38 hp. Given below is the 1 / 4 mile elapsed time calculator to calculate 1 / 4 mile ET from horsepower. Number of passengers: Avg. Weight is as the car sits on the line: driver and gas in it. It is used to give an estimate of vehicle(car, truck, motorcycle) engine horsepower. 1/4 mile or quarter mile is a drag race, a type of motor racing in which the vehicle compete to be first to cross a finish line. Horsepower. Enter the Weight and HP for ET and MPH, Then Press 'Enter' Key MPH = 234 * (HP / Weight) ^ .3333 ET = 1353 / MPH Weight Horsepower Weight should include the mass of the vehicle, driver and passenger. Secondary Propulsion Weight (in pounds): This could be a kicker motor or an electric trolling motor: Number of Batteries: Avg. This calculator will estimate the amount of horsepower a car is generating at the flywheel from the car's 1/4 mile time, trap speed and weight. Rear Wheel HP is assuming 10% drivetrain loss. Not a substitude for actual testing. The following two calculators can be used to estimate the engine horsepower of a vehicle based on the weight of the vehicle, elapsed time, and speed used to finish a quarter mile run. Engine Horsepower Calculator. Vehicle Weight (in pounds) Vehicle Horsepower: RPM through lights (finish line) Tire Diameter (Hght.) Elapsed time is the duration a vehicle takes to complete a run in a competition. 1 / 4 Mile ET Calculator. Horsepower Calculator from 1/4 mile time, Trap Speed & Weight. (i.e) from starting point to end line. Inputs: Calculate engine horsepower after a quarter mile run using the ET method. DragTimes App NEW: Download the DragTimes App in the iTunes store to Passenger Weight (in pounds): This web app uses the quarter mile distance or track. Trap speed is the velocity or speed of a vehicle at the end of a run or race competition. "Weight loss" to "Horsepower" Formula. Approximate Motor Weight (in pounds): Just a guess, to start. in Inches : 1/4 Mile … Horsepower is a unit of measurement of power developed by engineer James Watt in the late 18 th century. The answers will be for at sea level and standard pressure/temperature.