High DA
Thread Starter
Racer
Joined: May 2014
Posts: 317
Likes: 1
High DA
Heading to track tomorrow evening. DA is expected to be 7000+. Car is a bone stock auto on 91 pump gas. Expected time? 12.5-12.7? Anything I can do to overcome high DA? Getting a baseline before I send car off for a supercharger & headers.
Safety Car
Joined: Nov 2002
Posts: 4,168
Likes: 1,336
From: FLL Florida
How did you measure DA? Is the actual altitude 7000'? Santa Fe'? Will the DA be 7000' at the time you run in the evening. You only have 9 or 10 lbs pressure before the butterfly and maybe 19 20"hg. Make sure the car is not run for an hour before the run. Start it just before the run. Push it to the tree if possible. Arrive with an empty gas tank and chill 3 to 5 gallons of gas in a container and pour it in the tank just before the run. Airate the gas with pure oxygen if you can. Measure track temp and run as late as possible into the evening. Check wind. Xwind will give you colder air. Launch at higher than normal rpms and shift at redline. Base line at a different DA is pointless even with correction. There will be slightly less drag.
How much tread is there on the tires? Run them at 20"Do a test run without a burn out. I'd rather have cold cylinder heads and intake than hot tires.
How much tread is there on the tires? Run them at 20"Do a test run without a burn out. I'd rather have cold cylinder heads and intake than hot tires.
Last edited by Shaka; May 18, 2014 at 05:44 PM.
Melting Slicks
Joined: Feb 2006
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From: LAS VEGAS NV
St. Jude Donor '08
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Drifting
Joined: Jul 2013
Posts: 1,726
Likes: 770
Yesterday I trapped 111mph in DA of about 6400.
Launch was complete garbage, so I didn't even get into the 12's.
An LS2 GTO I went against only trapped 98mph for reference.
Launch was complete garbage, so I didn't even get into the 12's.
An LS2 GTO I went against only trapped 98mph for reference.
Last edited by C7pimp; May 18, 2014 at 06:35 PM.
Thread Starter
Racer
Joined: May 2014
Posts: 317
Likes: 1
How did you measure DA? Is the actual altitude 7000'? Santa Fe'? Will the DA be 7000' at the time you run in the evening. You only have 9 or 10 lbs pressure before the butterfly and maybe 19 20"hg. Make sure the car is not run for an hour before the run. Start it just before the run. Push it to the tree if possible. Arrive with an empty gas tank and chill 3 to 5 gallons of gas in a container and pour it in the tank just before the run. Airate the gas with pure oxygen if you can. Measure track temp and run as late as possible into the evening. Check wind. Xwind will give you colder air. Launch at higher than normal rpms and shift at redline. Base line at a different DA is pointless even with correction. There will be slightly less drag.
How much tread is there on the tires? Run them at 20"Do a test run without a burn out. I'd rather have cold cylinder heads and intake than hot tires.
How much tread is there on the tires? Run them at 20"Do a test run without a burn out. I'd rather have cold cylinder heads and intake than hot tires.
Altitude is 3800 and temp is 91 degrees. I am heading to track here in about 30 mins so I will see what they have at the track. I will report back. Friend has a 11 Camaro with bolt ons and headers and ran a
14 sec at 105.
I will add some of the other things mentioned as well and see what I can do. A lot of hanging heads out there in this heat.
Last edited by shftn7; May 18, 2014 at 08:18 PM.
Drifting
Joined: Jul 2013
Posts: 1,726
Likes: 770
I measured with a DA calculator based on the track. Pressure is 29.70,
Altitude is 3800 and temp is 91 degrees. I am heading to track here in about 30 mins so I will see what they have at the track. I will report back. Friend has a 11 Camaro with bolt ons and headers and ran a
14 sec at 105.
I will add some of the other things mentioned as well and see what I can do. A lot of hanging heads out there in this heat.
Altitude is 3800 and temp is 91 degrees. I am heading to track here in about 30 mins so I will see what they have at the track. I will report back. Friend has a 11 Camaro with bolt ons and headers and ran a
14 sec at 105.
I will add some of the other things mentioned as well and see what I can do. A lot of hanging heads out there in this heat.
This car launches much differently than my Mustang.
I trapped 111 in the vette and ran 13.2
I trapped 118 in my Mustang and ran an 11.6
It's all about traction and launch technique. I'm still finding that spot for the C7.
Btw, launch control on stock tires at the drag strip is worthless. It just spins off the line way too much. Way too high of rpm for a street compound.
Thread Starter
Racer
Joined: May 2014
Posts: 317
Likes: 1
! Launch was horrible on stock tires. I cut a 2.06 60 ft time. Smoked the other guy though at least. I drop off car Monday for supercharger so my only trip to the track stock. Tires and rims are a must. Another Vette hit a 12.7 stock and letting out I would have been a 12.9 or so so still not the best driver either but I had fun.
Le Mans Master
Joined: Oct 2005
Posts: 5,040
Likes: 879
From: Tampa Florida
Finally ran last night. 13.59 at 106 (came off gas). DA was 6600 ! Launch was horrible on stock tires. I cut a 2.06 60 ft time. Smoked the other guy though at least. I drop off car Monday for supercharger so my only trip to the track stock. Tires and rims are a must. Another Vette hit a 12.7 stock and letting out I would have been a 12.9 or so so still not the best driver either but I had fun.
! Launch was horrible on stock tires. I cut a 2.06 60 ft time. Smoked the other guy though at least. I drop off car Monday for supercharger so my only trip to the track stock. Tires and rims are a must. Another Vette hit a 12.7 stock and letting out I would have been a 12.9 or so so still not the best driver either but I had fun.