Applying NHRA Correction Factors
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From: The Top of Utah
Re: Applying NHRA Correction Factors (The Dude)
NHRA does not factor for atmospheric conditions. They DO factor for physical altitude for tracks above 1600 feet. I have a list of the NHRA correction factors for their tracks over 1600 feet. My weather station will correct an ET based on DA, to a sea level DA.
RACE ON!!!
RACE ON!!!
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From: Calif.
Re: Applying NHRA Correction Factors (CFI-EFI)
NHRA does not factor for atmospheric conditions. They DO factor for physical altitude for tracks above 1600 feet. I have a list of the NHRA correction factors for their tracks over 1600 feet. My weather station will correct an ET based on DA, to a sea level DA.
RACE ON!!!
RACE ON!!!
But I'm pretty pleased anyhow. I had a 1.791 60' on that run and got through the 1/8 with a 7.979 @ 87.21. That's not a best-ever, but it's pretty good considering the contitions, I think.
[Modified by The Dude, 11:03 AM 5/21/2004]
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From: The Top of Utah
Re: Applying NHRA Correction Factors (The Dude)
"The Strip" is listed at 2100 feet. The ET correction factor is .9830. The MPH factor is 1.0165. That converts your numbers, as follows:
12.475 becomes 12.263 sea level.
109.00 becomes 110.80 sea level.
1.79 becomes 175.756 sea level.
7.979 becomes 7.843 sea level.
87.21 becomes 88.65 sea level.
By the way, we'd kill for a 4900' DA. We had great conditions, last night. The DAs were right a 6200'. I can usually pick up a half second at Vegas in the fall
RACE ON!!!.
12.475 becomes 12.263 sea level.
109.00 becomes 110.80 sea level.
1.79 becomes 175.756 sea level.
7.979 becomes 7.843 sea level.
87.21 becomes 88.65 sea level.
By the way, we'd kill for a 4900' DA. We had great conditions, last night. The DAs were right a 6200'. I can usually pick up a half second at Vegas in the fall
RACE ON!!!.
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From: Calif.
Re: Applying NHRA Correction Factors (AZGASSER)
SIR lists its elevation as 3,075 ft. According to the NHRA the correction factors for 3,100 feet are .9627 for ET and 1.0395 for MPH.
Your run was equivalent to a (12.84 x .9627 = 12.36) at (110 x 1.0395 = 114.345.)
Your run was equivalent to a (12.84 x .9627 = 12.36) at (110 x 1.0395 = 114.345.)
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From: The Top of Utah
Re: Applying NHRA Correction Factors (The Dude)
Duke,
Where are you getting your numbers? Are mine out of date? I am taking mine from a National Dragster. They were effective, January 1st, 2002. S.I.R. is, indeed 3075'. NHRA lists the factor altitude as 3000'. My chart says the ET correction is .9727, and that the MPH factor is , 1.0262. Did you assume the 3100 foot correction altitude? My chart lists the various tracks and the altitude they are corrected from. Tucson was listed as 3000' along with the above numbers. I know the difference is slight. I'm not nit picking, but if my numbers are incorrect, I'd like to know.
RACE ON!!!
Where are you getting your numbers? Are mine out of date? I am taking mine from a National Dragster. They were effective, January 1st, 2002. S.I.R. is, indeed 3075'. NHRA lists the factor altitude as 3000'. My chart says the ET correction is .9727, and that the MPH factor is , 1.0262. Did you assume the 3100 foot correction altitude? My chart lists the various tracks and the altitude they are corrected from. Tucson was listed as 3000' along with the above numbers. I know the difference is slight. I'm not nit picking, but if my numbers are incorrect, I'd like to know.
RACE ON!!!
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Thread Starter
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Joined: Mar 1999
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From: Calif.
Re: Applying NHRA Correction Factors (CFI-EFI)
Got the factors here: http://www.prestage.com/Tech+Info/Drag+Racing/351.aspx
Granted, these numbers are from last year. Perhaps they've changed. If that's the case I'd default to the chart in "National Dragster."
I rounded up to 3,100 since the track itself lists its altitude as 3,075 ft. here: http://www.sirace.com/stats/SIRinfo.htm.
Maybe NHRA rounds down.
[Modified by The Dude, 11:07 AM 5/24/2004]
Granted, these numbers are from last year. Perhaps they've changed. If that's the case I'd default to the chart in "National Dragster."
I rounded up to 3,100 since the track itself lists its altitude as 3,075 ft. here: http://www.sirace.com/stats/SIRinfo.htm.
Maybe NHRA rounds down.
[Modified by The Dude, 11:07 AM 5/24/2004]
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From: The Top of Utah
Re: Applying NHRA Correction Factors (The Dude)
Your info is later than mine, depending how old the information that site has. My digger says, effective, 1/1/02. *I* would have rounded to 3100', myself, but this listing shows the specific tracks, and the factored altitude. Sometimes there is no rhyme or reason to NHRA's methods. My track is physically at 4225', but we're factored at 4400. Thanks for your feedback.
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Melting Slicks
Joined: Dec 2001
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From: Billings MT
CFI-EFI: Do you by chance know the corrected factor for the Track in Acton/Billings Montana: IMSP. ?
Was out on Saturday and the DA was 7400ft.
Needless to say I ran a little slow, but still managed a 12.2 @ 112
Was out on Saturday and the DA was 7400ft.
Needless to say I ran a little slow, but still managed a 12.2 @ 112
Last edited by VETDRMS; Jul 12, 2004 at 07:57 PM.
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From: Somers NY
It does not matter what the actual track alt is, or what the corr. alt is... if a record is set NHRA doesn't not use any factoring.. Thats why most records are set at E town, Reading Pa. Tx. wherever the actual track is physically low so it gets good barometer readings.
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From: Pennsylvania
Originally Posted by Red96Coupe
It does not matter what the actual track alt is, or what the corr. alt is... if a record is set NHRA doesn't not use any factoring.. Thats why most records are set at E town, Reading Pa. Tx. wherever the actual track is physically low so it gets good barometer readings.
When the BIG BOYS run there in March/April, they'll always run fast, with a chance at setting the National ET/MPH Records.
Gainesville is physically 'low', but the reason they run so fast there (I'm told) is because the track is as flat as a pool-table...
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From: The Top of Utah
Originally Posted by VETDRMS
CFI-EFI: Do you by chance know the corrected factor for the Track in Acton/Billings Montana: IMSP. ?
JP, Glensgages,
NHRA DOES factor ETs in the Sportsman's classes, such as Stock and Super Stock, for record purposes. It is MY experience that the factor isn't as good as actually, being there. In 2000 the division 7 finals were at Sonoma, Sears Point, back then, altitude 35'. I had a "personal best of 15.52 at home before heading to the finals. That factors to a 14.68 at sea level. I had two 14.52's at Sonoma A full second better than my home "best" and a tenth and a half faster than the factored equivalent.
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From: Pennsylvania
CFI-EFI:
yeah, the factors only apply to NHRA Sportsman classes, and not the Professional, or even alcohol classes.
Sorry if I confused anyone.
Based-on an actual 14.52 at INFINEON, what would you have had-to run at your home track to be corrected to the 14.52, something like a 15-thirty?
yeah, the factors only apply to NHRA Sportsman classes, and not the Professional, or even alcohol classes.
Sorry if I confused anyone.
Based-on an actual 14.52 at INFINEON, what would you have had-to run at your home track to be corrected to the 14.52, something like a 15-thirty?
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From: The Top of Utah
Originally Posted by ricer
CFI-EFI:
Based-on an actual 14.52 at INFINEON, what would you have had-to run at your home track to be corrected to the 14.52, something like a 15-thirty?
Based-on an actual 14.52 at INFINEON, what would you have had-to run at your home track to be corrected to the 14.52, something like a 15-thirty?
Now, I'm running low 14.50s at home, in DAs above 7000'. Not too bad if you consider I started out at 16.75, and I haven't gone inside my worn out, 160,000 mile, Crossfire engine. I can't wait to get to this year's finals at Bakersfield. 635'!
RACE ON!!!
