Altitude????
Thread Starter
Drifting
Joined: Nov 2002
Posts: 1,587
Likes: 0
From: Colorado Springs CO
Altitude????
Does anyone have or know of a formula to calculate how much HP I lose at a given altitude? I live in Colorado at over 7000 feet above sea level. I have heard that you lose from 3-5% per 1000 foot in altitude change.
Any input appreciated. Thanks.
Any input appreciated. Thanks.
Drifting
Joined: Feb 1999
Posts: 1,809
Likes: 0
From: Post Falls ID
Re: Altitude???? (Yano)
Its not quite as simple as that. Here's a link: http://www.csgnetwork.com/relativehpcalc.html
If its any help the NHRA ET Correction chart shows you would correct your run by the following: ET x .9125
If its any help the NHRA ET Correction chart shows you would correct your run by the following: ET x .9125
Racer
Joined: Nov 2002
Posts: 307
Likes: 0
From: Denver Colorado
Re: Altitude???? (topgun)
I've wondered that too, in Denver too. I'm at about 6k feet. In fact was giving serious consideration to the Vortech supercharger to get some more air.
My Coupe still seems quick, but I'm sure we'd notice a difference at sea level.
My Coupe still seems quick, but I'm sure we'd notice a difference at sea level.
Drifting
Joined: Aug 2002
Posts: 1,317
Likes: 0
From: Lancaster CA
Re: Altitude???? (topgun)
If its any help the NHRA ET Correction chart shows you would correct your run by the following: ET x .9125
[Modified by scool93535, 11:45 AM 11/29/2002]
Safety Car
Joined: May 2000
Posts: 4,808
Likes: 344
From: Albuquerque NM
Re: Altitude???? (Yano)
Other factors do come into play, but the change in air density due to altitude changes cost you about 3% power per 1,000 feet.
[Modified by 6Speeder, 2:17 PM 11/29/2002]
[Modified by 6Speeder, 2:17 PM 11/29/2002]
Le Mans Master
Joined: Apr 2001
Posts: 5,467
Likes: 713
From: Black Forest CO
Re: Altitude???? (Yano)
I am located in Colorado Springs too. I have only had engines dynoed here but have never had a car on a chassis dyno. I have had three engines dynoed at Lanier's and one at McCabe Motorsports. The variance between observed power and corrected to std dyno has usually been 22% to 26%. The one that lost the least was supercharged. The altitude here makes a huge difference!
Melting Slicks
Joined: Dec 2001
Posts: 2,040
Likes: 0
From: Collin County Texas
Re: Altitude???? (Yano)
Drifting
Joined: Feb 1999
Posts: 1,809
Likes: 0
From: Post Falls ID
Re: Altitude???? (scool93535)
If its any help the NHRA ET Correction chart shows you would correct your run by the following: ET x .9125
Hi topgun, Do you have a line to that NHRA site? :cheers:
[Modified by scool93535, 11:45 AM 11/29/2002]
Hi topgun, Do you have a line to that NHRA site? :cheers:
[Modified by scool93535, 11:45 AM 11/29/2002]
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Thread Starter
Drifting
Joined: Nov 2002
Posts: 1,587
Likes: 0
From: Colorado Springs CO
Re: Altitude???? (Tom Steele)
Thanks guys!!!!! Looks like the supercharger is going to be a must!!!! :thumbs: :thumbs:
If I did my math correct it looks like I lose about 1.2 seconds in the ET and almost 8 mph in trap speed! :sad: :sad: :sad: :sad: :sad: :sad: :sad:
[Modified by Yano, 10:31 PM 11/29/2002]
If I did my math correct it looks like I lose about 1.2 seconds in the ET and almost 8 mph in trap speed! :sad: :sad: :sad: :sad: :sad: :sad: :sad:
[Modified by Yano, 10:31 PM 11/29/2002]