He says he's seen humidity as low as single-digit percentages in Phoenix, which makes tuning a challenge. Lambeck adds that water in the air has a big effect on the tune-up at both ends of the vapor-pressure scale. Temperature and vapor pressure are the two leading variables that most affect engine performance. These estimates are generalizations based on experience, and it points out that if you become good at keeping records on your car's performance, you will soon be able to predict it rather accurately based on the effect of density altitude. As an example, the new 427ci LS7 Corvette engine rated at 505 hp would probably correct to closer to 530 hp using the performance-industry gross correction factor (C.F. This correction factor reduces the old gross-horsepower output number by roughly 5 percent but is also more realistic. This current Detroit correction factor uses a lower 29.235 inches of Mercury pressure with a higher air temperature of 77 degrees F and zero vapor pressure. In 1972, Detroit switched to a net horsepower correction followed by several more changes, the last of which occurred with SAE standard J1349. Through the early '70s, these were the numbers Detroit advertised and the performance industry followed. As you can imagine, these are ideal or "gross" horsepower numbers that are not practical in the real world but serve as a common reference point. The original "gross" horsepower correction factor includes the standard of 29.92 inches of Mercury (Hg), which is standard sea-level pressure, combined with a temperature of 60 degrees F with no humidity, or zero vapor pressure. Your use of this application is at your sole risk.The Shell Game of Correction FactorsSince internal-combustion engines are directly affected by the constant change in atmospheric conditions, long ago the automotive industry came up with a plan for using correction factors to establish a common ground from which all power numbers could be compared. The service is not intended for use in situations in which the failure of the service could lead to death, personal injury, or severe physical or environmental damage. Users should always contact official sources for the most accurate and timely updates. We love feedback! Email us at Altitude+ uses available third party weather and elevation data to calculate atmospheric measurements, but Rate Of Climb does not guarantee that the original sources (including the National Weather Service, FAA and others) have provided data that is accurate, complete, timely, or properly formatted. Great tool for pilots, drag racers, engine tuners, golfers, or anyone who needs to conveniently find their Density Altitude, Altimeter Setting, Relative Aid Density (RAD), Specific Humidity or Absolute Pressure. Designed not to need an internet connection, so it will work anytime and anywhere you need it. If you're out of cell range, all you need to supply is the outside air temperature. If you're in cell range, you don't need to supply any data. The quickest way to get your Density Altitude! On the iPhone 6/6+ and newer iPads, it will use the built-in barometer and GPS. * Location Search: Find atmospheric data (Density Altitude, etc.) at any point on Earth, from anywhere!ĭata Sensed and Calculated (all calculated with humidity): Great without cellular connection as well, which makes it all the more useful in the backcountry and far away from ASOS/AWOS stations. * Takes humidity into account in all calculations, making it more accurate than the typical dry bulb approximation formula used by AWOS/ASOS, etc. * Seamlessly integrates weather data, GPS and your phone's onboard barometer to quickly and accurately calculate your density altitude, altimeter setting, relative air density, and more. Many other uses for engine tuning, racing, sports, etc. Super useful for pilots, especially in the backcountry. Instant and location accurate Density Altitude calculator/instrument app for iPhone and iPad that also finds relative air density (RAD), altimeter setting, relative humidity, specific humidity (grains/lb) and more. Fast, accurate density altitude app: altimeter setting, relative air density (RAD) and more using your device's onboard sensors and detailed physics calculations.
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