How much is good air worth?

Happy Thanksgiving everyone!

Loaded up this morning to head to the 3-day Thanksgiving race in Dallas.



It was a blustery 28 degrees in East Texas this morning! The last time out we ran a PB of 11.74 (1.53 60') with a DA of 1850'. This morning the DA was NEGATIVE 1800'. It's supposed to stay well below sea level the next several days. Assuming they prep the track correctly and that it hooks how much ET is there in a swing of 3600'?

Hope each of you have a safe and peaceful Thanksgiving Day with your friends and family.

Scott

[Don Higgins]

It will be fast, however you will run into the "law of diminishing returns" where the car simply can't go any faster, regardless of DA. My quickest ETs are at -400 DA when the Baro was 30.20. I ran in -1200 DA and the car was no quicker.

Make sure you give it plenty of fuel....

[gbur]

you shall see

[countrypuppy4865]

From my experience, our cars would probably pick up .15-.20 in those conditions, but as Don said you can get to a point when the air is so good it doesn't make much difference. Every car is different, you just have to learn how your car is effected, which you should today.

[Jeff Teuton]

+1800 to - 1800. 2 tenths. Give it some fuel. Take away some timing. Both.

[Dan Fahey]

My car runs better at lower DA.
But you have to add in Moisture content that takes away the Oxygen if you have equals DA readings.
Cold dry days are best with high Barometric readings and very low humidity.

Learned a lot from flying planes. Especially in Denver on hot days.
Fully loaded private prop planes without a TC cannot take off.
Prop can't generate enough bite and the wing enough lift.
DA readings can be several thousand feet higher.
Barometer readings in the 26 range.

Coastal tracks you can see better DA than middle America.
Strange that Cecil County Dragway is 500 ft above sea level.
But Cold Air Day Drag days see DA's as low as 2000ft below sea level.

East coaster love to go to that track for bragging rights.
Racers from Ohio take the treck out every year just for that experience.

My best on Cool airs are consistent Low low 13's.
Managed a 12.88 at Cecil. DA -800ft
Where at Pittsburgh last Summer ran 13.80's hot lapping, in the morning a 13.65 cold.
DA was reported near 4000ft.

D

[Dave Casey]

Cecil is not the best example in my opinion because I believe it is downhill some.

Jeff's estimate is solid

Thanks guys. We will post results after the Super Pro cars get some rubber down and the starting line is good. I appreciate the advice ... can't add fuel though as we don't have the ability to tune. Not even sure if that is legal in Pure Stock. ??? We have a really good tuner that does ours on the dyno but once you leave him no adjustments. Lows 11.5x would be nice ... almost a second under in a car with OEM heads that we still drive on the street.

Scott

[tj310]

http://www.dragtimes.com/da-density-...e=Calculate+DA ....This is a link to a site that helps with calculations ---Trevor

[Dan Fahey]

Originally Posted by Dave Casey

Cecil is not the best example in my opinion because I believe it is downhill some.

Jeff's estimate is solid

Dave just providing my experience.
BTW made a mistake, Cecil is 320 ft. above sea level.
Mason Dixon is 550 ft. above sea level.
The difference is only 3ft and within margin of most tracks.

ATCO and Englishtown are 55ft and 57 Ft above sea level.
Have run comparable best times at cold weather meets.
Englishtown's cold air day winds freezes up the starting line as soon as Sun drops a little.
Ruining making a good run.

Cecil is an easy track to get to.
Sun falls behind the starting line keeping it warmer longer.
Seems to get better air more often than other tracks.
The air feels calmer and more tail wind.

Need to check on this.
Cecil's location may have better weather patterns and terrain.

Englishtown is a consistent Headwind Track.
Can tell watching the planes take off & land at the local airport next door.
Historically most of the records were set at Atco and Etown in April.

Early records from 1975 show consistent one 1-2 tenths better at Cecil compared to Mason Dixon, 75&80, York (at the time), Capitol.

Sure would like to know what other racers records show.
I know Tom Gould kept some serious records.

Dan