Try out this calculator get a rough estimate of horsepower. Weight is as the car sits on the line: driver and gas in it. Elapsed time is the duration a vehicle takes to complete a run in a competition. Trap speed is the velocity or speed of a vehicle at the end of a run or race competition. Enter the Weight and HP for ET and MPH, Then Press 'Enter' Key MPH = 234 * (HP / Weight) ^ .3333 ET = 1353 / MPH Weight Horsepower Given below is the 1 / 4 mile elapsed time calculator to calculate 1 / 4 mile ET from horsepower. Battery Weight (in pounds): A typical battery is 65 lbs. DRAG PERFORMANCE CALCULATOR. in Inches : 1/4 Mile … The answers will be for at sea level and standard pressure/temperature. Old weight (3500) / New Power-to-Weight Ratio (15.81) = 221.38 hp. DragTimes App NEW: Download the DragTimes App in the iTunes store to Adjust using real data after you get close. Compute estimated increase in engine horsepower when an after market, racing upgrade or performance part has been installed with ET. "Weight loss" to "Horsepower" Formula. This calculator computes the estimated engine or motor horsepower from trap speed. 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. Horsepower. Inputs: Horsepower Calculator From 1/4 Mile Stats: Wallace Racing BACK to Calculators These equations are for recreation only. Approximate Motor Weight (in pounds): Just a guess, to start. Vehicle Weight (in pounds) Vehicle Horsepower: RPM through lights (finish line) Tire Diameter (Hght.) 1 / 4 Mile ET Calculator. 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. 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 is a unit of measurement of power developed by engineer James Watt in the late 18 th century. It is used to give an estimate of vehicle(car, truck, motorcycle) engine horsepower. 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. Not a substitude for actual testing. Rear Wheel HP is assuming 10% drivetrain loss. 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. Engine Horsepower Calculator. (i.e) from starting point to end line. Horsepower Calculator from 1/4 mile time, Trap Speed & Weight. 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. Passenger Weight (in pounds): Calculate engine horsepower after a quarter mile run using the ET method. Vehicle weight should include not only the vehicle, but also the driver, the passenger, and anything else of significant weight. Note: This is a rough and quick estimate of engine horsepower. This rich Internet app uses the quarter mile distance or 400 meter track. Number of passengers: Avg. This calculator computes the estimated engine or motor horsepower from elapsed time. 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