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. How to use the quarter mile calculator: 1. 1/4 Mile Racing Final Speed Calculator. Very few cars run 100% of their optimum. Learn how reducing the car's weight affects its performance. The times shown are effectively the best most drivers can hope to achieve. Horsepower Calculator From 1/4 Mile Stats: Wallace Racing BACK to Calculators These equations are for recreation only. The other factors can significantly affect the elapsed time. The start will be the hardest part, as you are accelerating from a standing start. As you drop the clutch, the engine revs could significantly decrease if you don't smoothly engage the first gear. He wrote up his theory in a 1973 article in The American Journal of Physics entitled, On the Physics of Drag Racing, coming up with the following significant variables that affect the ET and trap speed: Fox concluded that the power and the weight of the vehicle are the major factors in determining the final speed, making it more useful than the ET if you want to estimate the horsepower of a vehicle. The results in the calculator are only statistical estimates. weight is the total weight of the vehicle (including the driver) in pounds. Rear Wheel HP is assuming 10% drivetrain loss. Anything from air and tyre temperature to less … Home Page. Compute ideal MPH and times at 60', 330', 660' and 1000'. These equations are for recreation only. The entire car must be set up perfectly to run these times. For the elapsed time, common sense dictates that the heavier a vehicle is, and less horsepower it has, so the longer the ET over a quarter-mile distance will be. where: ET is the elapsed time over a quarter-mile distance. 1/4 Mile RPM Calculator. This chart is under optimal conditions. Welcome to SAU Community, like most online communities you must register to view or post in our community, but don't worry this is a simple free process that requires minimal information for you to signup. We can see that Huntington and Fox give very similar ETs, but Hale gives a significantly shorter elapsed time. There are scores of factors that can affect quarter mile and 0-60mph times that may affect the results. The results are similar from all three equations, and they give a good first-order approximation of the quarter-mile performance figures without considering some of the other variables that are difficult to determine. Start new topics and reply to others Subscribe to topics and forums … To do this, put in its weight and then enter a value for either the time or the speed. This 1/4 mile calculator uses the rear wheel horsepower instead of flywheel horsepower to determine the times and speed of the run. Back in the 1950s, engineer and automotive enthusiast Roger Huntington wanted to determine a mathematical relationship between a vehicle's power, weight, and performance over a 1/4-mile distance (a typical track length used in drag racing). Instructions: 1) Enter a value in any box. Later on in the 1960s, a physics professor named Geoffrey Fox at the University of Santa Clara proposed a theoretical basis for Huntington's formula. Enter MPH, The Tire Height in Inches, The Rearend Ratio, Trans Ratio, & Converter Slip % RPM = (Rearend Ratio * MPH * 336.136 * Trans Ratio * (1 + (Conv Slip% / 100))) / Tire Height MPH Tire Height Rearend Ratio Trans Ratio Conv Slip % RPM = ? 23 Mount Erin Rd, Blair Athol NSW 2560, Australia +61 2 9607 2299 It combines a quarter-mile time calculator and a quarter-mile speed calculator. Compute ET and MPH at 60', 330', 660' and 1000' 60' time: 2) Click the 'Calculate' button. However, Fox made similar measurements to Huntington and refined the constants in his equations resulting in the following formulas: In the 1980s, drag racer, engineer and computer programmer Patrick Hale produced software that took all the variables listed above into account to estimate the ET and trap speed. (i.e) from starting point to end line. This calculator estimates your 60 foot, eighth and quarter mile elapsed times and trap speed when given the weight of the car and flywheel or wheel horsepower. Not a substitude for actual testing. With this quarter-mile ET calculator, you can: In this article, you'll also learn about the history of attempting to calculate the elapsed time and speed over a quarter-mile, using only the vehicle's power and weight. Wallace Racing - ET/MPH/HP Calculator. 6.290 is an empirically derived constant. The results section shows you the estimated elapsed time over the 1/4-mile, and the final speed at the quarter-mile point. (no weather correction). So he plotted the data on a graph of weight/power against the 1/4-mile elapsed time and derived the following empirical equation (a quarter-mile ET calculator): ET = 6.290 * (weight / power)¹ᐟ³. Enter the total weight of the car and driver. Plugging these numbers into Huntington's equations gives: ET = 6.290 * (weight / power)¹ᐟ³ = 6.290 * (1788 / 975)¹ᐟ³ = 7.699 seconds, final speed = 224 * (power / weight)¹ᐟ³ = 224 * (975 / 1788)¹ᐟ³ = 183 mph, ET = 6.269 * (weight / power)¹ᐟ³ = 6.269 * (1788 / 975)¹ᐟ³ = 7.673 seconds, final speed = 230 * (power / weight)¹ᐟ³ = 230 * (975 / 1788)¹ᐟ³ = 187.9 mph, ET = 5.825 * (weight / power)¹ᐟ³ = 5.825 * (1788 / 975)¹ᐟ³ = 7.13 seconds, final speed = 234 * (power / weight)¹ᐟ³ = 234 * (975 / 1788)¹ᐟ³ = 191.17 mph. If you're thinking of entering your car into a drag race and are wondering how well it would perform, then this quarter-mile calculator is for you. The calculator can also be used in reverse to estimate your car's power given a measured quarter-mile elapsed time or final speed. Car 1/4 Mile Calculator - Accuracy and Variables. gear ratios and gearbox type (e.g., manual or automatic). ET and MPH in Quarter Calculator: Wallace Racing BACK to Calculators. Given below is the 1 / 4 mile elapsed time calculator to calculate 1 / 4 mile ET from horsepower. The trap speed results are more spread out, ranging from 183 mph for Huntington to 191 mph for Hales. The calculator can also be used in reverse to estimate your car's power given a measured quarter-mile elapsed time or final speed. This chart shows how much horsepower is needed at the flywheel to run an Elapsed Time in the ¼ mile. Enter the car's peak power output. Weight is as the car sits on the line: driver and gas in it. Taking into account the driver's weight (let's use Lewis Hamilton, who weighs 150 lb), that makes a total weight of 1788 lb. 0-60, 0-100, 1/4 mile performance calculator. The results section shows you the estimated elapsed time over the 1/4-mile, and the final speed at the quarter-mile point. However, he also produced similar formulas to estimate the performance values from just the power and weight: First, decide which formula to use. To do this, put in its weight and then enter a value for either the time or the speed. For a standard car, you can look up its weight in the manual or search for it online. The quarter mile time should be a normal run. When performing the quarter-mile run, you need to maintain the peak power rpm over the entire distance. Using only your car's power and weight, it will estimate its 1/4-mile elapsed time (ET) and final speed (trap speed). For 60 foot, 330 foot and 660 foot split as well use our quarter mile calculator with incremental. 1/4 Mile Time Calculator Welcome to SAU Community. 3) All other values will be automatically calculated.