LB7: How much power do you lose at high elevation

[66FLH]

Not sure where to post this but I was wondering if anyone had any accurate #'s to tell me how much power I am losing at 7000ft. where I live vs. Sea level...I know when I go down South and get closer to 4000 ft. I can feel a difference.
Thanks.

 

[hondarider552]

Well, me being in AZ at 1200 feet running a 12.6 with stock turbo, went to ABQ NM at 5500 feet and ran 13.4

 

[paint94979]

Well, me being in AZ at 1200 feet running a 12.6 with stock turbo, went to ABQ NM at 5500 feet and ran 13.4

Brian that is no excuse... to run that slow. Fact is elevation greatly affects horsepower.

 

[gmduramax]

Brian that is no excuse... to run that slow. Fact is elevation greatly affects horsepower.

What's your excuse for losing 7mph in redding?

 

[paint94979]

What's your excuse for losing 7mph in redding?

TCM tune... put the original TCM tune back in and ran 115mph..

 

[1chevy02]

dragtimes.com has a calculator to figure the hp loss for a particular density altitude. I use the turbocharged engine part. I have no idea how accurate it is but its cool to see how much it affects it

 

[Utahski]

The numbers I was given: normally aspirated gasoline 4% loss per 1000' elevation.....turbo diesel 2% per 1000'.

 

[TrentNell]

Brian that is no excuse... to run that slow. Fact is elevation greatly affects horsepower.

Can i use that as a excuse , I have always raced at high elevation ,the day i ran 11.0 it was a D/A of 7200 ft .


to the OP on turbo diesels from my experience the more air / turbo you have the lesser the affect . with my old twins i figured i was only loosing a couple .10's on a single cp3 , untill i cranked the fuel way up and then i was probably loosing more. A stock turbo / tuned truck will be affected alot by altitude not sure on a % though . Hopefully i can hit up truck fest or even my own track and will know the diff between AZ and the higher altitudes .

 

[hondarider552]

I ran realyyyy slow at truckfest last year :rofl::rofl:

 

[KEVINL]

I ran realyyyy slow at truckfest last year :rofl::rofl:

You ran really slow At the Diesel Desert Nationals:rofl:

 

[paint94979]

You ran really slow At the Diesel Desert Nationals:rofl:

x2

 

[whitetrash21]

You ran really slow At the Diesel Desert Nationals:rofl:

lol... i know of a clapped out lb7 wearing a lumber rack and a shit ton of tools that ran faster than brian.... :joker::hug:

 

[hondarider552]

You ran really slow At the Diesel Desert Nationals:rofl:

15.22 seconds faster than you :rofl:

 

[jckleewein]

I ran realyyyy slow at truckfest last year :rofl::rofl:

Me to, but I couldn't get my 4094R to spool.

 

[Iceman56]

All I know is when I pull my big enclosed trailor full of snowmobiles up to the mountains once I start getting into elevation my truck feels like a TURD!

 

[BoiseRob]

All I know is when I pull my big enclosed trailor full of snowmobiles up to the mountains once I start getting into elevation my truck feels like a FORD!

Fixed it for you...

 

[jckleewein]

Fixed it for you...

:spit::rofl::rofl:

 

[66FLH]

Thanks for all of the replies fella's...I'm planning on going to Vegas this summer and I was just wondering if I could bust out a mid to high 12 in the quarter...:thumb:

 

[Redbowties88]

yea its a big difference in NA engines over charged ones....riding my bike through the mountains it takes a big power toll...the truck dogs a little but not too bad really.

and i live at sea level so im used to nice dense air

 

[seven3smoke]

Typicaly ever racer will loose a half second in the 1/4. You can try to tune for the reduced air which is a bit easier with a supercharger (overdrive) but you will feel the difference. Weather will also play a big part of the adjusted elevation factor, dry and hot will really be tough.