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Calculate Grains of Water and HP Correction- Wallace Racing
http://www.wallaceracing.com/grains-water.php
This calculator uses the Motorsports Standard Atmosphere (MSA). (Not ISA - International Standard Atmosphere) Grains - Grains of water vapor per pound of dry air. The HP Correction is a better determination of ET than the DA (Density Altitude). I …
water grains | Yellow Bullet Forums
https://www.yellowbullet.com/threads/water-grains.500189/
"Anything below 50 grains is considered dry," Walsh says. "Anything above that is wet, and anything above 100 is really bad. The worst I've ever seen was in Memphis a few years ago, when that race was in August: 130 grains. The cars don't want to run at all when there's that much water in the air.
HUMIDITY CAN BE THE DEVIL FOR DRAG RACERS - Competition …
http://www.competitionplus.com/drag-racing/news/15585-humidity-can-be-the-devil-for-drag-racers
Racers measure how severe the humidity is by the water grains. The level of water grains is calculated from temperature and relative humidity. “Anytime the humidity gets in the 110 grains, it is hard to overcome,” confirmed Okuhara. Friday was on the verge of being really bad conditions for the tuners to overcome. The water grains were at 109 with an air temperature of …
Racing Fundamentals with Air Density Tuning
https://www.racingjunk.com/news/racing-fundamentals-with-air-density-tuning/
Many tuners use water grains as a measure of how much moisture is in the air. Water grains in the air are less affected by the temperature. …
Atmospheric water vapor and horsepower « Air Density …
https://airdensityonline.com/2017/04/water-vapor-horsepower/
The best way to track water vapor is by following the grains of water on the tracks pages. The higher that number, the more water vapor is in the air. On our site, we list the air density with and without water vapor. The bigger the …
Density Altitude, Air Density, Water Grains Tuning
https://racecarbook.com/freebies/density-altitude/
The site provides real-time, forecast, and historical weather variables including air density, density altitude, and grains of water. Currently the site features over 600 race tracks worldwide including dragstrips, circle tracks, nascar, and karting. If your track isn’t listed, contact us and we’ll add it.
Measuring the Atmosphere Around a Track « Air Density …
https://airdensityonline.com/2016/08/measuring-racetrack-atmosphere/
This is an absolute measurement of how much water vapor is in the air. There are 7000 grains in a pound of water. There are 13.1 cubic feet of dry air in a pound of dry air. The measurement of grains of water is the amount of grains in a pound of air. While relative humidity and dew point are influenced by the temperature, grains of water is an absolute measurement …
Biondo Racing - Racing Tips and FAQ - Drag Racing …
https://www.biondoracing.com/tips.shtml
Water Grains-If you see water grains go up at the same time humidity goes up, you are generally going to see a significantly more slow down than if humidity goes up and water grains stays the same. The same is true when humidity and water grains go down. Track Conditions-Track temperatures and track prep will also affect your vehicles performance. The ideal track …
Moist Air - Weight of Water Vapor - Engineering ToolBox
https://www.engineeringtoolbox.com/water-vapor-air-d_854.html
100. 140. 190. -. * grains of water is commonly used in psychrometrics. 1 grain = 0.000143 lbm = 0.0648 g (7000 grains per lbm) Same table as above with water vapor in "pounds water vapor per pound dry air". Water Vapor in Air ( pounds water vapor per pound dry air) Relative Humidity.
How to Tune Your Race Car for Weather Conditions
https://www.onallcylinders.com/2013/05/17/racing-with-mother-nature-how-to-tune-for-weather-conditions/
One of the keys to tuning for weather is the carburetor setup, jetting in particular. Here’s an example: when the thermometer rises, the density of the air decreases. That effectively decreases the available oxygen to feed the engine. Carburetor jetting should be reduced to compensate and prevent an over-rich air/fuel mixture.
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