Negative density altitde factors.

**PowerWagon896** · 06-02-2006, 03:56 PM

Can anyone post a link where I can get negative density altitude factors?

I have one for positive factors but not for negative.

**PowerWagon896** · 06-02-2006, 06:50 PM

I guess I'm not the only one that can't find this.

I am trying to defend someone on another forum that posted some fantastic times when the Density Altitude was way negative. He ended up getting beat up pretty bad over it. I wanted to compare his nagative DA times to my 2400' DA times because I think his times are very plausable given the ideal conditions he was running at.

**GasGunR** · 06-02-2006, 07:15 PM

There was a thread here with formulas and ton of discussion and then a formula correction for conditions that are below sea level... I'll do a search and see if I can find it... you might want to do one too, in case I miss it

Don

**GasGunR** · 06-02-2006, 07:20 PM

Whew, try this thread... unless you are a MAth Major though it might be easier to just PM RandomAccess with the conditions

HELP NEEDED: Dragstrip Altitude/Weather Correction Formula

Good luck!

Don

**PowerWagon896** · 06-02-2006, 07:46 PM

Originally Posted by GasGunR

Whew, try this thread... unless you are a MAth Major though it might be easier to just PM RandomAccess with the conditions

HELP NEEDED: Dragstrip Altitude/Weather Correction Formula

Good luck!

Don

I know the density altitude for both runs.

Him -1600' 13.1 @ 106 MPH compared to me +2400' 13.9 @ 103 MPH

While nobody flamed me for the times I posted, this poor guy got beat up by some SRT bullies over on the Charger forums. Both of our cars are basicly the same, Stock Daytonas with Superchips and a lower temp tstat. He had slicks, I was on OEM tires.

Given 4000' difference in D.A. I think his times are very plausable since he had slicks. .8 diference in time, 3 MPH diference in top speed. He was accused of "spraying" by an SRT guy that runs times slower than what he posted.

**GasGunR** · 06-02-2006, 10:09 PM

Slicks wouldn't help at our local track... can't spin the tires with my SRT there!

Don

**PowerWagon896** · 06-02-2006, 11:41 PM

Originally Posted by GasGunR

Slicks wouldn't help at our local track... can't spin the tires with my SRT there!

Don

Maybe so but a 4000' density altitude should make quite a difference.

I am just trying to prove or disprove plausability here.

If I could find the tables with negative Density Altitude factors I could correct that run to sea level and compare to my run corrected to sea level. We are talking about 7-8 tenths of a second. Would 4000" difference in D.A. make that plausable? My times corrected to sea level are in the mid 13.5 range or 4/10ths better. Would an aditional 1600' difference make a 3/10ths difference? that would be within less than 1/10 of a second. Is that plausable?

This is not a personal axe I have to grind, I just would like to know if this guy deserved to be flamed the way he was. His times do not seem that far fetched to me considering the conditions.

**Hemi31** · 06-03-2006, 08:45 AM

If you put your 13.8 pass in and use 4000' DA it comes back with a 13.18 at sea level.I think thats the difference you were looking for,and it's still a 4000' swing.

**PowerWagon896** · 06-03-2006, 09:46 AM

Originally Posted by Hemi31

If you put your 13.8 pass in and use 4000' DA it comes back with a 13.18 at sea level.I think thats the difference you were looking for,and it's still a 4000' swing.

Yep that's the way I figured it, but I am looking for something that I can cite as in some official web site. The guy turned 13.17 @ 106 MP and the SRT guys are flaming him. They won t shut up until something in black and white such as a link to a D.A table with negative factors is posted.

He was pretty much running the same set-up as I ran @ Napierville with the addition of slicks. He said the temperatures where in the 40s and other people that were @ the track quoted D.A. of -1600'. His times seem perfectly plausable when compared to mine. The run was made back in the early spring @ Cecil Co. Dragstrip in Maryland.

I mean no offense to any SRT owners, but I think that the guy with the SRT was sore because he had 13.2 @ 106 MPH as his best E.T. listed in his signature.

**magnuman** · 06-03-2006, 06:26 PM

PW896,
Heck with the negative DA formula, tell us about the second story door to nowhere in the background???

**Hemi31** · 06-03-2006, 08:03 PM

Originally Posted by magnuman

PW896,
Heck with the negative DA formula, tell us about the second story door to nowhere in the background???

That's gotta be fun at parties!

**Hurst Equipped** · 06-03-2006, 08:20 PM

all the guys needs is a timeslip from the track to verify his run. if that doesn't quiet the SRT guys, a mathematical formula isn't going to help quiet them either.

-1600' talk about a free supercharger from mother nature.

**RobAGD** · 06-03-2006, 08:36 PM

65 - The problem is they think he is spraying the car.

I mentioned in that thread about with the air he had and the mods w/ the short tires made the differnace for him but they were kinda lead by a guy that hates Daytona 777

-Robert

**Hurst Equipped** · 06-03-2006, 08:43 PM

i remember when hemi777 ran a 13.1 with his 26" slicks. is this the same guy? any link to the tread at the other site? it sounds like an interesting read.