Comparative DA correction test from AZ to NJ
Thread Starter
Race Director
Joined: Sep 2007
Posts: 16,557
Likes: 2,108
From: Peoria/Phoenix AZ
C6 of Year Finalist (performance mods) 2019
I'm presently in a Mt. Laurel hotel and my only real plans before going to Atco are to clean the rain/road dirt off and get an oil change.
For sure I'll be there.
For sure I'll be there.
Team Owner
Joined: Feb 2001
Posts: 27,254
Likes: 136
From: Short Hills, NJ
Even though I live over an hour north of there, I hang right down that way almost every other weekend, was there just yesterday actually. 
Not sure I'll make it down there tomorrow but I might try, good luck.
Also, if you're still around this weekend and have no plans late on Saturday night, this is happening not too far from you:
http://forums.corvetteforum.com/show....php?t=1984666
Not sure I'll make it down there tomorrow but I might try, good luck.
Also, if you're still around this weekend and have no plans late on Saturday night, this is happening not too far from you:
http://forums.corvetteforum.com/show....php?t=1984666
Thread Starter
Race Director
Joined: Sep 2007
Posts: 16,557
Likes: 2,108
From: Peoria/Phoenix AZ
C6 of Year Finalist (performance mods) 2019
Even though I live over an hour north of there, I hang right down that way almost every other weekend, was there just yesterday actually.
Not sure I'll make it down there tomorrow but I might try, good luck.
Also, if you're still around this weekend and have no plans late on Saturday night, this is happening not too far from you:
http://forums.corvetteforum.com/show....php?t=1984666
Not sure I'll make it down there tomorrow but I might try, good luck.
Also, if you're still around this weekend and have no plans late on Saturday night, this is happening not too far from you:
http://forums.corvetteforum.com/show....php?t=1984666
Team Owner
Joined: Feb 2001
Posts: 27,254
Likes: 136
From: Short Hills, NJ
it is at midnight on Saturday night just in case you're back early enough. I'm still not totally positive that I'm going on the cheesesteak run yet either but probably.
Burning Brakes
Joined: Feb 2008
Posts: 988
Likes: 2
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Thread Starter
Race Director
Joined: Sep 2007
Posts: 16,557
Likes: 2,108
From: Peoria/Phoenix AZ
C6 of Year Finalist (performance mods) 2019
Here's the results. Totally inconclusive and no scanner available yet to post timeslips.
I made 4 passes. Hooked up good for 1.90 60's for the first 2, but spun
for the first time on the other 2 runs. 1.97 and 1.95.
1. 12.10 @ 117.95 DA 29' corr. to 12.10 @ 117.98
2. 12.08 @ 118.25 DA 5' corr. to 12.08 @ 118.26
3. 12.07 @ 119.54 DA -821' corr. to 12.17 @ 118.61
4. 12.09 @ 118.99 DA -1119' corr. to 12.22 @ 117.75
What a missed opportunity on the last two runs at negative DA. I may never get to run in those conditions again. At least not in Phoenix.
Assuming the car had no differences in performance between AZ and NJ, I would have expected it to run about .15 quicker and 3 mph faster if the online calculator is correct on the first 2 runs. I have to discount the last 2 runs due to spinning that I attribute to either the track prep going away or additional power from the neg. DA that I never experienced before. I'm guessing the former, even though I'd like to believe the latter.
I'm going to E-town on the 26th for the CC and try again. Won't have great air, but hope to have fun anyway. See you there.
I made 4 passes. Hooked up good for 1.90 60's for the first 2, but spun
for the first time on the other 2 runs. 1.97 and 1.95.1. 12.10 @ 117.95 DA 29' corr. to 12.10 @ 117.98
2. 12.08 @ 118.25 DA 5' corr. to 12.08 @ 118.26
3. 12.07 @ 119.54 DA -821' corr. to 12.17 @ 118.61
4. 12.09 @ 118.99 DA -1119' corr. to 12.22 @ 117.75
What a missed opportunity on the last two runs at negative DA. I may never get to run in those conditions again. At least not in Phoenix.
Assuming the car had no differences in performance between AZ and NJ, I would have expected it to run about .15 quicker and 3 mph faster if the online calculator is correct on the first 2 runs. I have to discount the last 2 runs due to spinning that I attribute to either the track prep going away or additional power from the neg. DA that I never experienced before. I'm guessing the former, even though I'd like to believe the latter.
I'm going to E-town on the 26th for the CC and try again. Won't have great air, but hope to have fun anyway. See you there.
Team Owner
Joined: Feb 2001
Posts: 27,254
Likes: 136
From: Short Hills, NJ
Some interesting (though I agree, not entirely conclusive) findings there.
I was checking the (online) air conditions throughout the evening at Atco last and didn't think the DA was ever as high as 29 feet, it would be quite odd for the DA to swing a whole 1100 feet when the barometer remained between 30.15 and 30.24 the whole time. Though temps did range from around 58 degrees down to 49/48 degrees during track hours so I guess it is possible.
I remember telling people ('glennhl' among them) years ago that simply because one suddenly runs their car in notably better quality air conditions, be it going from 70 degrees to 50 degrees or even from 1100 feet DA to as low as -1100 feet does not mean that they will automatically and without a doubt ET substantially quicker. Sometimes yes, but not always.
While again not totally conclusive, I think the above results kind of confirm at least a little of what some of us have been trying to explain for years now.
I was checking the (online) air conditions throughout the evening at Atco last and didn't think the DA was ever as high as 29 feet, it would be quite odd for the DA to swing a whole 1100 feet when the barometer remained between 30.15 and 30.24 the whole time. Though temps did range from around 58 degrees down to 49/48 degrees during track hours so I guess it is possible.
I remember telling people ('glennhl' among them) years ago that simply because one suddenly runs their car in notably better quality air conditions, be it going from 70 degrees to 50 degrees or even from 1100 feet DA to as low as -1100 feet does not mean that they will automatically and without a doubt ET substantially quicker. Sometimes yes, but not always.
While again not totally conclusive, I think the above results kind of confirm at least a little of what some of us have been trying to explain for years now.
Race Director
Joined: Mar 2005
Posts: 11,549
Likes: 27
From: Southampton NJ
Tom good job. the extra power from da changed the playing field for sure. wish i could have been their, i wanted to lay down a 10.8s run for you so i started putting in an EWP i got from Cory Harris LS2 PORT WORKS. and didnt finish it until wed night around 8
Drifting
Joined: Dec 2002
Posts: 1,613
Likes: 0
Here's the results. Totally inconclusive and no scanner available yet to post timeslips.
I made 4 passes. Hooked up good for 1.90 60's for the first 2, but spun for the first time on the other 2 runs. 1.97 and 1.95.
1. 12.10 @ 117.95 DA 29' corr. to 12.10 @ 117.98
2. 12.08 @ 118.25 DA 5' corr. to 12.08 @ 118.26
3. 12.07 @ 119.54 DA -821' corr. to 12.17 @ 118.61
4. 12.09 @ 118.99 DA -1119' corr. to 12.22 @ 117.75
What a missed opportunity on the last two runs at negative DA. I may never get to run in those conditions again. At least not in Phoenix.
Assuming the car had no differences in performance between AZ and NJ, I would have expected it to run about .15 quicker and 3 mph faster if the online calculator is correct on the first 2 runs. I have to discount the last 2 runs due to spinning that I attribute to either the track prep going away or additional power from the neg. DA that I never experienced before. I'm guessing the former, even though I'd like to believe the latter.
I'm going to E-town on the 26th for the CC and try again. Won't have great air, but hope to have fun anyway. See you there.
I made 4 passes. Hooked up good for 1.90 60's for the first 2, but spun
for the first time on the other 2 runs. 1.97 and 1.95.1. 12.10 @ 117.95 DA 29' corr. to 12.10 @ 117.98
2. 12.08 @ 118.25 DA 5' corr. to 12.08 @ 118.26
3. 12.07 @ 119.54 DA -821' corr. to 12.17 @ 118.61
4. 12.09 @ 118.99 DA -1119' corr. to 12.22 @ 117.75
What a missed opportunity on the last two runs at negative DA. I may never get to run in those conditions again. At least not in Phoenix.
Assuming the car had no differences in performance between AZ and NJ, I would have expected it to run about .15 quicker and 3 mph faster if the online calculator is correct on the first 2 runs. I have to discount the last 2 runs due to spinning that I attribute to either the track prep going away or additional power from the neg. DA that I never experienced before. I'm guessing the former, even though I'd like to believe the latter.
I'm going to E-town on the 26th for the CC and try again. Won't have great air, but hope to have fun anyway. See you there.
12.3 118.4 11.94 121.9 vs 12.08 118.3 (run was real close to real sea level)
ET was .14 off
But MPH was 3.6 off 
Too many factors to know for sure but I would rather run 12.0 than 12.3 anyday.
Last edited by SoldSyclone; Apr 17, 2008 at 12:15 PM.
Le Mans Master
Joined: Feb 2006
Posts: 5,762
Likes: 4
From: Chandler Arizona
Some interesting (though I agree, not entirely conclusive) findings there.
I was checking the (online) air conditions throughout the evening at Atco last and didn't think the DA was ever as high as 29 feet, it would be quite odd for the DA to swing a whole 1100 feet when the barometer remained between 30.15 and 30.24 the whole time. Though temps did range from around 58 degrees down to 49/48 degrees during track hours so I guess it is possible.
I remember telling people ('glennhl' among them) years ago that simply because one suddenly runs their car in notably better quality air conditions, be it going from 70 degrees to 50 degrees or even from 1100 feet DA to as low as -1100 feet does not mean that they will automatically and without a doubt ET substantially quicker. Sometimes yes, but not always.
While again not totally conclusive, I think the above results kind of confirm at least a little of what some of us have been trying to explain for years now.
I was checking the (online) air conditions throughout the evening at Atco last and didn't think the DA was ever as high as 29 feet, it would be quite odd for the DA to swing a whole 1100 feet when the barometer remained between 30.15 and 30.24 the whole time. Though temps did range from around 58 degrees down to 49/48 degrees during track hours so I guess it is possible.
I remember telling people ('glennhl' among them) years ago that simply because one suddenly runs their car in notably better quality air conditions, be it going from 70 degrees to 50 degrees or even from 1100 feet DA to as low as -1100 feet does not mean that they will automatically and without a doubt ET substantially quicker. Sometimes yes, but not always.
While again not totally conclusive, I think the above results kind of confirm at least a little of what some of us have been trying to explain for years now.
I normally run faster with lower DA's, but NEVER as fast as the correction factors say I should.
Thread Starter
Race Director
Joined: Sep 2007
Posts: 16,557
Likes: 2,108
From: Peoria/Phoenix AZ
C6 of Year Finalist (performance mods) 2019
It looks like the rain will hold off until Sunday, so I'm planning on meeting some of you at the Corvette Challenge at E-town.
Thread Starter
Race Director
Joined: Sep 2007
Posts: 16,557
Likes: 2,108
From: Peoria/Phoenix AZ
C6 of Year Finalist (performance mods) 2019
The CC at E-town was almost everything I had hoped it would be. A great time with a great bunch of guys and a couple of gals. I can't remember the names of all the people I met, because there were so many. BTW, the helmets E-town rents are only for 14 sec. and slower, but some of the guys hooked me up with John (Illegal) Panuzzo, who let me borrow his for the day. Jeanne Linke, who won handily, is not only a looker, but cut some real good lights. Needless to say, I had a good time. Saw Wayne Keegan turn a perfect 10.000 and a 10.002 on consecutive passes in the 10.0 comp.
Downsides were two guys with broken rears/axles and a C-5 that lost it and met the wall at 300'. Ouch!
My runs were not so good, but they were consistant. 12.21, 12.25, 12.26, and 12.25 red light on first comp. pass. I'm not sure what the DA was, as I was getting a sunburn and temp readings in the high 60's with humidity around 40%. The two close WU stations had high 50's and 70%.
Spent the last week in DC. Headed to SC and then home to AZ. Had a lot of fun and may do the east coast again next year.
Downsides were two guys with broken rears/axles and a C-5 that lost it and met the wall at 300'. Ouch!
My runs were not so good, but they were consistant. 12.21, 12.25, 12.26, and 12.25 red light on first comp. pass. I'm not sure what the DA was, as I was getting a sunburn and temp readings in the high 60's with humidity around 40%. The two close WU stations had high 50's and 70%.
Spent the last week in DC. Headed to SC and then home to AZ. Had a lot of fun and may do the east coast again next year.
Team Owner
Joined: Feb 2001
Posts: 27,254
Likes: 136
From: Short Hills, NJ
Bet you're glad to be home now though.