Elevation effect on E.T. - Ford Powerstroke Diesel Forum
Drag Talk/Racing Lets see them slips, How To's, FAQs

 
LinkBack Thread Tools Display Modes
post #1 of 7 Old 11-16-2008, 09:46 PM Thread Starter
Compression Ignition Addict
 
FordCowboy's Avatar
 
Join Date: Feb 2008
Location: Colorado
Posts: 613
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Elevation effect on E.T.

Just curious if anyone has a good idea of how much elevation affects track times. Being in Colorado, and running at Bandimere which is around 5,800ft I know my times are going to be slower because there is less air up here, I am just curious how much slower. I see lots of people post their times and with trucks very similar to mine, running like 1-2 seconds faster, so how much of this is due to elevation?

Early 99 Powerstroke
Crew Cab Short Bed Lariat 4x4
SCT Livewire w/ various custom tunes
AFE stage 2
Super 66 Turbo
4" straight pipe
Modded IDM
Automatic trans: PI Converter, tugger kit
Leveling Kit w/ 35's
FordCowboy is offline  
post #2 of 7 Old 11-16-2008, 09:48 PM
Compression Ignition Addict
 
Join Date: May 2007
Location: America
Posts: 6,782
Thanks: 0
Thanked 1 Time in 1 Post
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
I would only think it would effect your turbo lag. It seems like 20 psi of boost @5800ft would be the same as 20 psi of boost @100ft.
2005F250 is offline  
post #3 of 7 Old 11-16-2008, 10:02 PM Thread Starter
Compression Ignition Addict
 
FordCowboy's Avatar
 
Join Date: Feb 2008
Location: Colorado
Posts: 613
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Quote:
I would only think it would effect your turbo lag. It seems like 20 psi of boost @5800ft would be the same as 20 psi of boost @100ft.
Ok, so I finally found something that gives somewhat of an idea. I think this is what is used in NHRA to even out numbers from around the country. This will tell you what your time would equal at sea level. So my 16.2 would be 15.0 at sea level. But now you have me wondering what effect a turbo and diesel has on this that might make the numbers in this chart not as accurate for us.

NHRA Elevation Correction Factors - TSR Software

Early 99 Powerstroke
Crew Cab Short Bed Lariat 4x4
SCT Livewire w/ various custom tunes
AFE stage 2
Super 66 Turbo
4" straight pipe
Modded IDM
Automatic trans: PI Converter, tugger kit
Leveling Kit w/ 35's
FordCowboy is offline  
post #4 of 7 Old 11-16-2008, 10:16 PM
Compression Ignition Addict
 
Join Date: May 2007
Location: America
Posts: 6,782
Thanks: 0
Thanked 1 Time in 1 Post
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Quote:
Originally Posted by 2005F250 View Post
I would only think it would effect your turbo lag. It seems like 20 psi of boost @5800ft would be the same as 20 psi of boost @100ft.
Quote:
Originally Posted by FordCowboy View Post
Ok, so I finally found something that gives somewhat of an idea. I think this is what is used in NHRA to even out numbers from around the country. This will tell you what your time would equal at sea level. So my 16.2 would be 15.0 at sea level. But now you have me wondering what effect a turbo and diesel has on this that might make the numbers in this chart not as accurate for us.

NHRA Elevation Correction Factors - TSR Software
Okay but now I have a question about my comment. Does it take more effort to make 20psi of boost @5800ft as it does @100ft?
2005F250 is offline  
post #5 of 7 Old 11-16-2008, 10:24 PM Thread Starter
Compression Ignition Addict
 
FordCowboy's Avatar
 
Join Date: Feb 2008
Location: Colorado
Posts: 613
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Quote:
Okay but now I have a question about my comment. Does it take more effort to make 20psi of boost @5800ft as it does @100ft
I'm gonna go with not more effort but as you said turbo lag would be an issue because there is less air available so more time to acquire the needed air to make 20psi. So this would make me think the numbers in the chart aren't quite as accurate for a turbo'd motor. Also this is getting more complex than I really care about and probably not that much difference but, since diesel burns more so than explodes like gas and there are no spark plugs to help the burn is there going to be an effect from this that isn't accounted for in the chart.

Early 99 Powerstroke
Crew Cab Short Bed Lariat 4x4
SCT Livewire w/ various custom tunes
AFE stage 2
Super 66 Turbo
4" straight pipe
Modded IDM
Automatic trans: PI Converter, tugger kit
Leveling Kit w/ 35's
FordCowboy is offline  
post #6 of 7 Old 11-20-2008, 06:09 AM
Compression Ignition Addict
 
Join Date: Dec 2007
Location: Taft, CA
Posts: 334
Thanks: 0
Thanked 1 Time in 1 Post
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Elevation per say has no effect on the time slips.
Density Altitude does. It has temp. Humidity, etc. factored in.
DA does effect all engines, more so on the NA engines.
The reason is the track I go to is about 650'.
Most of the time the DA is 2000+'
Some tracks back east are near sea level, get in close to winter and you can get a DA -1000'
Makes a HUGE difference in the running of the cars.
The factors posted look to be for NA engines.

Troy Simmons
08 F450 4x4
tbsimmons is offline  
post #7 of 7 Old 01-05-2009, 07:36 PM
Member
 
Join Date: Jan 2009
Location: va beach
Posts: 51
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
i live in virginia and drove home to castle rock co, with my old mustang though, but it still ran like crap its two totaly differnet worlds. it felt like a 50 hp difference

04 F-250 4X4 Lariat FX4 6.0
SCT by Twisted Diesel (Insanity)
aFe Pro Dry Stage II
No Exhaust
:burnout
chucknorris1217 is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Ford Powerstroke Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome