just wondering how much elevation can effect performance.and just how much.i live where the elevation is around 3000 feet.how would this compare to about sea level?

 

i would like to add temperature, humidity and presure to effects on performance.

i droped 100lbs and went from a 35 to a 75shot and still didn't make up for a 40deg diference in temp, there may have been other weather diferences too.

any rules of thumb for all of this stuff

 

as a rule you lose 3% HP for every 1000ft. of elevation.

 

damn thats more than what i thought.9% loss is alot.looks like my best mod would be to move <img border="0" alt="[jester]" title="" src="graemlins/gr_jest.gif" />

 

Im not sure on the spelling of it but its called the Adabatic laps rate and it is calulated with a barometer and a hygrometer. Ill look it up tonight and tell you the formula.

 

If you had been at HRP last Friday nite you would have seen how temp and humidity can affect performance. Pro Stock cars were going 6.72 at 205 all nite long. That never happened before in NHRA history. It was cold and very humid. You could cut the air with a knife. Baytown, Tx. is only about 20 miles from the Gulf of Mexico and the adjusted elevation was about 250 feet BELOW sealevel. Everything runs good in those conditions. Your MAF does an auto adjust for elevation so it doesn't make any difference if your in Baytown or Denver. The old days when you had to rejet your carb to run in the Rockies are long gone. If you want to see cars fly just be sure to be in Baytown for the Friday nite session next year. Kalitta went 333 MPH. Now that's impressive.

 

The elevation at a raceway in california, palmdale raceway is about 2500 feet. The track webpage at http://www.lacr.net/indexmain.htm , has a calculator to adjust your times at the track for elevation.

Typically a car/truck in palmdale runs .3-.6 slower in the quarter. Pomona or a San Fernando Valley California track is at at the most maybe 500-1000 ft. SO for every 1500 feet (over sea level) figure a minimum of .3-.6 tenths of a second loss in the quarter mile.