Thericker

I'm very curious about the Conversion equation used? also is it only used if the track is above sea level? thank you in advance..

Jrocket

I could tell you face to face but Im terrible with putting it into type,plus my spelling just flat out sucks.It has alot to do with how a car is going to run that day.

Check these out.

http://wahiduddin.net/calc/calc_da_rh.htm

http://www.staginglight.com/guide/air.html

Can Drive 55

Density Altitude, I presume. It is a product of humidity, pressure, and temp. I do not know the formula, but it converts the current conditions to sea level at a standard temp and pressure. Don't know those either, but my guess is the temp is 32 degrees and the pressure would be whatever in of HG would convert to about 14.7 PSI. At least I think it is 14.7. Someone will correct me in a few minutes.

Thericker

OK..trying to help a friend find out if there's any converting for his altitude and 1/4 mile time

He ran a 13.2 @ 109

altitude 1227 feet
temp--57 degrees
humidity--40-50% (not sure)
barometer--30.06

Any 1/4 mile ET or trap speed change ??

Can Drive 55

Density Altitude Calculator Results

Density Altitude 1309 feet
Absolute Pressure 28.752 inches Hg
Relative Density 96.23 %

Thericker

So what would =the corrected time be?

Can Drive 55

Maybe DA conversion does not compute that. Since I admit I am an idiot on the subject, I might have been saying something that was not true. I bet someone who knows what they are talking about will chime in a bit. My experience is point and shoot and hope for the best. I have not been involved with technical aspects of racing since the 60's and things have changed a lot since then. Hope you find your answer soon.

Jrocket

It might.What track was that at?

Jrocket

http://www.hardtail.com/techtips/altitude.html

Thericker

SpeedWorld in Surprise Arizona....Thanks for that link but I must be a retard It's like frickin' Chinese Arithmetic to me

Guess I shouldn't of had that last beer....

Thericker

Thanks for trying to help me I appreciate it...

Jrocket

I was just there at X-mas time,good place to run the car.Traction was a problem for me but I did get some decent runs in.

I could be wrong but Im guessing your buddies car at sea level would have been around 13.00@110.Given the inputs from you.

Can Drive 55

I am going to ask a friend of mine who is a pro racer and premier engine builder what he knows about the subject. He has a weather station and keeps track of the data. BTW, he has a 64 fairlane Thunderbolt nad has turned a 9.95. Quite the quick car.

I will get back to you if I find out anything useful.

sgtstanko

As explained you take the temp, sea level of the track and humidity. I run at Irwindale and Qualcomm for 1/8 mile and the only other closer track is Fontana. Our times will never be as good as say ATCO in New York they are below sea level and typically (after the summer) have dry cold weather like we just experience and run about 4/10 and faster than we do out here. Below sea level is like a natural supercharger effect. The DA correction factor helps level the playing field so you get a real baseline to compare to the quicker tracks.

Grumpy666

13.01 @ 110.6

Here's what you're missing to complete the calculation:

http://www.smokemup.com/auto_math/nh...on_factors.php