Horsepower vs altitude

[Y-NOT]

I took the Willys out for a few runs with my performance meter. The horsepower numbers were pretty low. I found the calculator for horsepower vs altitude, turns out at 7000' you only have about 76% of your sea level HP. Here is the link to the calculator:
http://www.slowgt.com/Calc2.htm#BasAltCal
Bill

[davids]

Bill, do you have to worry about all of that when you have fuel injection?? Dave Sorry I didn't make it to Williams this year..It's a good show..I'll try to be their next year...Dave

[Y-NOT]

David,
There is less oxygen at the higher altitudes. The car runs perfect, but it is female (no balls) at 7000'
Bill

[bobcowan]

You lose about 2-3% per thousand feet. Give or take. I live at 6,400', and my car makes pretty good power. I was at hastings recently; 2200'. Wow! What a differance. That extra 10-12% is really noticable. Since I have EFI, I just drove it off the trailer and onto the track. No tuning needed.

EFI will maintain drivability by adjusting the fuel curves for altitude. But it won't give your hp back. The only thing that can do that is FI.

[John-Tucson]

Hey Y-Not, I guess that that altitude stuff kinda' explains Mikiec. No oxygen and no b...s. Na' I can't say nasty things about our President. Just joking Mikiec.

[davids]

I had no problems with my first 64 FI Corvette..Ever since I've had FI in my sports cars..Just no problems...10,000 miles now on the Coupe and no engine problems except once in awhile little leaks.. Dave

[Bob Broberg SPF667 460BB]

I spent time up to 12,000 feet in Colorado in July and boy do you lose a lot of hp up there.

AZ Bob

[MEATMASTER]

Originally Posted by Bob Broberg SPF667 460BB

I spent time up to 12,000 feet in Colorado in July and boy do you lose a lot of hp up there.
AZ Bob

And Brain Cells, but at least the HP came back.

MEATMASTER "...give me your dog, I'll roast that thang fer ya!"

[Bob Broberg SPF667 460BB]

Kumpie, this explains a lot.
AZ Bob from under the dashboard.