How much is good air worth?

[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

[Lee Valentine]

At times you get DA readings that look awesome but the ET's aren't what your predictions tell you. This usually caused by a cool temp reading but baro. and humidity aren't that great, happens at Maple Grove and Atco frequently.

[art leong]

At the Gator's this spring. The temps were in the low 70's but the humidity and barometer were killer. So it was a mineshaft.

[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

[Dave Ribeiro]

Scott,

I think Jeff,Jimmy Jr. & Dave were right on two tenths .. As you know there are many other factors that enter in this discussion .. But, their est. was right on, no sub for experience ... Good Luck testing & write it all down !!

Originally Posted by Dave Ribeiro

Scott,

I think Jeff,Jimmy Jr. & Dave were right on two tenths .. As you know there are many other factors that enter in this discussion .. But, their est. was right on, no sub for experience ... Good Luck testing & write it all down !!

Yep, they were right on it! Here we are on Friday ...


After our last TNT pass Friday night the Check Engine Light came on and the codes indicated the oxygen sensors had gone out. We packed it up and came home and will replace those this week.

Scott