![]() For example, if you ran that 12.0 at 3750 lbs and want to know how much taking 100 lbs off the car would help, calculate hp at full weight to get 427.5 hp, and then use that and the lighter weight to calcuate the new et, 11.89. Do the math yourself, and even if the number is a little wrong it will be consistent so you can evaluate changes. That's what the online calculators do that start with mph, they just don't show the equations and don't tell you what they are using for the fudge factor (I've seen anywhere from 1340 to 1370 ). Calculate the theoretical 1/8 Mile ET, 1/4 Mile ET, 1/4 Mile Top End Speed, and Ideal 1/4 Mile Gear Ratio for a given application based on the Vehicle Weight (in pounds), Vehicle Horsepower (at the flywheel), RPM through lights (finish line), and Tire Diameter (Height) in Inches. The mph is much more reproducible at the track than the et, so what I like to do is use the mph to calculate the et then use that in the hp formula. F bodies usually mph 2-3 higher for the same et so that number should be changed for them, etc. For G bodies I fit the 180 reader's rides times at and got 1356, so I use et = 1356 / mph, so a 12.0 would be at 113.0 mph. The formula is et = constant / mph, and if you ignore aerodynamics then physics says the constant is something like 1450 (that's a real fuzzy memory and a number NOONE uses ). Relating et and mph with any accuracy at all requires a fudge factor to account for aerodynamics, and here you will get different numbers from different online calculators. So if your car weighs 3600 and you weigh 150 lbs so the total is 3750 lbs and you ran a 12.0 you averaged 427.5 whp applied to the track. This equation is exact and includes no fudge factors of any kind, just unit conversions. ET's are hard to reproduce but ignoring that you can derive (I posted this 6-8 years ago if you want to see all the equations) that the average whp = 197 * weight in pounds going down the track / (et * et * et). Boost and Airflow Calculator Displacement in Cubic Inches, Engine displacement in cubic inches PSI Boost Required Pounds Air/ Minute for Desired Hp CFM for. This gives a minimum average hp estimate, which to me is a good thing - you might make more hp some of the time but if so, you must be making less hp some of the rest of the time. You have to make some kind of assumption about the variation in hp to get an answer from physics, and the simplest one to make is to assume that hp is constant for the entire pass. All of that is why I derived them myself a long time ago. Simply enter your goal crank horsepower goal, the number of injectors (cylinders) your engine has, the correct number based on aspiration of your engine, and goal PSI at the rail.Most of the online calculators that I've looked at estimate wheel hp applied to the track, although almost none of them say one way or the other and most people have no idea, and many will argue that it must be flywheel. ) Fuel Injector Clinics Horsepower Calculator helps you know what horsepower each injector size will support. We've built this handy Fuel Injector sizing calculator to help you determine how much flow you'll need. 800-HP Twin-Turbo ZR-1,1000-HP Zora Hybrid. Connection Type - Some injectors are universal and must be crimped into the ECU harness to operation, where others are available with plug-and-play connections for simple installations.Low impedance injectors are used on high performance applications, where high impedance injectors are commonly used on stock applications. Impedance - Simply put, it's the electrical resistance of the injector.The selector allows the user to pick the number of fuel injectors, input estimated horsepower, and the type of. It is capable of recommending fuel injector sizing for naturally aspirated and turbo combinations that are run on gasoline, alcohol, or ethanol. Flow Rate / PSI - Referred to in CC (cubic centimeters), this is how much fuel the injector will move over 1 minute. FuelTech makes the selection easier for all enthusiasts with its Fuel Injector Calculator.When shopping for fuel injectors, you want to consider the flow rates / pressure, impedance, and connection type It may even do damage if inadequate fuel enters the engine under heavy load. Without correctly sized injectors, the car wont be able to make max power, and in some cases it wont run at all. It's the fuel delivery system.įuel injectors are one of the most important pieces of the puzzle in building a fast car. What's the most important component in a racecar? Not the turbo, not the engine, and not the suspension. Looking to build a car with serious power, and turn heads on the street and strip or racetrack? You need to know the correct sized fuel injector that will get you there.
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