Racing yesterday @ E-Town

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MB43

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No Wally for me... But my car ran good, no problems all day long (for once)

Time run 1 - .178 RT, 1.778 60', 12.661 @ 104.93. DA was 2997, 92 degrees, 53% humidity.
Time run 2 - .082 RT, 1.758 60', 12.668 @ 104.59. DA was 3273, 97 degrees, 43% humidity.

Let's see... Two .66's, what should I dial?

Eliminations run 1 - .105 RT, 1.773 60', 12.707 @ 104.66. DA was 3544, 101 degrees, 36% humidity. Good thing my opponent bulbed, I had a bad RT and didn't run my number. I bumped my dial up to 12.68 for round 2.
Eliminiations run 2 - .082 RT, 1.751 60', 12.663 @ 104.69. DA was 3415, 99 degrees, 34% humidity. I should've stuck with the .66 dial. Not only did I break out, but I got beat to the line by .022.

Oh well!

It was an interesting day... One guy smacked the wall on a big money run, another guy blew up, it looked like he had a multi-stage nitrous system and when the last stage kicked in there was a huge fireball and parts went everywhere. There was a photographer and a bunch of models roaming around, they said they were from a magazine from California. They used my car as a backdrop for a bunch of shots. I told them to make sure the sponsor decals were easy to read. I also had a pair of jackasses block my car in at my pit, I called security, they announced it over the loudspeaker and just when the wrecker showed up to haul them away the owners showed up to move their cars.

Here's a video from the 1st round yesterday:

http://www.burwoodboysracing.com/Movies/8_21_2005.wmv
 
From: http://wahiduddin.net/calc/density_altitude.htm

The density altitude is the altitude at which the density of the International Standard Atmosphere (ISA) is the same as the density of the air being evaluated. (The Standard Atmosphere is simply a mathematical model of the atmosphere which is standardized so that predictable calculations can be made.)

So, the basic idea of calculating density altitude is to calculate the actual density of the air, and then find the altitude at which that same air density occurs in the Standard Atmosphere.
Click to expand...

There's a whole lot of good stuff about how to calculate it on that page.

But... As it relates to racing, the higher the density altitude, the slower you will go (with a carburated engine). Higher DA = Lower HP.

Did you ever hear them talking about "minshaft conditions" on NHRA Today or during a race? That means that the DA is very low, like -2000 feet.
 
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