05-25-2019, 12:05 AM | #1 |
Drives: 2016 2SS 8AT Join Date: May 2018
Location: Nevada
Posts: 358
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Question on altitude 1/4
So I have a draggy unit and tested my car today and ended up with a 12.79 @ 110.63. I know that's nothing to brag about but the altitude here is 6700ft and the da was 8999ft.
I have ported intake and throttle body, rotofab and 2" kooks . Does that seem about right for an auto car? |
05-25-2019, 01:59 AM | #2 |
Drives: 2018 SS 1LE Join Date: May 2018
Location: Arizona
Posts: 292
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DA hurt you big time, I battle higher DA here in AZ from 3,800-5,000
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🌽 Sauced, 2018 SS 1LE - 123mph @ 5,000 DA
ARH 2”x3” FULL System, Pray Ported MSD Intake Manifold, Pray Ported GM 95mm TB, RotoFab CAI, DsX e85 Kit, MightyMouse Catch Can, NicD Tune https://instagram.com/corn_sauced?ut...d=o0ako89uurwl |
05-25-2019, 08:24 AM | #3 |
Drives: 2018 ZL1 coupe Join Date: Nov 2018
Location: Prescott, Arizona
Posts: 589
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Each 1000ft of DA is, roughly, a 3% loss of HP in a naturally aspirated car.
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05-25-2019, 02:50 PM | #4 |
Drives: 14 Silverado LTZ Z71, 16 Camaro SS Join Date: Nov 2009
Location: Jackson, Michigan
Posts: 4,407
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Every 1000 ft is roughly a tenth.
At sea level you would be high 11s no doubt The dragy is actually very accurate too |
05-29-2019, 09:32 AM | #5 |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,799
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pretty good for 9k DA imo.
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2016 NFG 1SS A8
Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA |
05-29-2019, 04:32 PM | #6 |
Drives: 2016 2SS 8AT Join Date: May 2018
Location: Nevada
Posts: 358
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05-29-2019, 06:58 PM | #7 |
Drives: 2019 zl1 6 speed Join Date: Jul 2017
Location: Lake Havasu Arizona
Posts: 979
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12.88 is my pb, and I did it in Vegas during ls fest. I'm a manual, obviously lol,, and I have secondary cat delete, rotofab intake and ps4's on stock rims. The da up there is so bad, my other option is up in pheonix, so I try to go to the Vegas one. Idk if I used the da calculator wrong, but the da was 7770. When is the next test n tune?
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05-29-2019, 07:56 PM | #8 |
Drives: 2016 2SS 8AT Join Date: May 2018
Location: Nevada
Posts: 358
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Dang the da was that bad at ls fest?! Wow. I was there Saturday morning (without my car) left to go to supercross. Usually going from my hometown to Vegas makes the engine feel like it gained 2 more cyls.
I don't know when the next test and tune is. I live about 3 and a half hours away. They used to do something like every other Friday night or Saturday night to cut down on street racing but I think it's now moved to a week night. |
05-30-2019, 06:08 AM | #9 |
Drives: 2019 zl1 6 speed Join Date: Jul 2017
Location: Lake Havasu Arizona
Posts: 979
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Yah, I'm 2 1/2 hours away, it's a trek. I wish it was every other weekend again, I don't know why they changed it. There's no good places around here to race.
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05-30-2019, 07:00 AM | #10 |
Drives: 2016 2SS 8AT Join Date: May 2018
Location: Nevada
Posts: 358
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Agree with you there. I've been hoping our airport starts something up as for right now "Mexico" is the only thing in a 250mile radius.
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05-31-2019, 03:31 AM | #11 | |
Drives: 2017 Camaro 1SS Join Date: Aug 2016
Location: NH
Posts: 1,692
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Quote:
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05-31-2019, 06:08 AM | #12 |
Drives: 2019 zl1 6 speed Join Date: Jul 2017
Location: Lake Havasu Arizona
Posts: 979
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I thought something was up, but couldn't figure out why. So next time, I need to get the atmospheric pressure from a weather station, to be more accurate? I'm obviously new at figuring out da hah.
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05-31-2019, 06:29 AM | #13 | |
Drives: 2017 Camaro 1SS Join Date: Aug 2016
Location: NH
Posts: 1,692
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Quote:
If that track is 2100' ASL then I'd say it's roughly a couple tenths slower than low altitude in similar temp/humidity, due to the lower pressure. I found that running an NA motor at a mile high was about a half-second slower than it was at low altitude. So roughly a tenth per 1000' ASL that you go up, rule of thumb that has been posted before, seems to make some sense. |
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05-31-2019, 04:51 PM | #14 |
Drives: 2019 zl1 6 speed Join Date: Jul 2017
Location: Lake Havasu Arizona
Posts: 979
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I checked the da a few days after I got home and pulled all of the info off of the dyno sheet minus elevation, I looked that up, so no clue. /shrug
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