How Much Does Density Altitude Affect ET

cmracing · 12-13-2019, 12:29 AM

Quote:

Originally Posted by Keith 944

On my two cars basically 200 feet of altitude change equals one hundred .01 I run them a little fat so that it will be this way

My faster car is about .01 per 300ft running on race gas.

Richard Grant · 12-13-2019, 10:19 AM

My experience has been that if you run around the ideal air/fuel ratio you will see 150 ft equals .01. Or you can run lean and move higher into the 200ft area. It gets hairy as you get leaner and can do engine damage. The only time that I've seen the 300ft range is with ethanol in our bracket car. A normal ethanol car will equal the 300ft per .01 area. If you don't see these numbers or if your car isn't consistent , you probably have a problem that needs correcting.

12-13-2019, 10:19 AM	#2
Richard Grant Member Join Date: Jan 2002 Location: West Monroe, La. Posts: 301 Likes: 9 Liked 13 Times in 7 Posts	Re: How Much Does Density Altitude Affect ET My experience has been that if you run around the ideal air/fuel ratio you will see 150 ft equals .01. Or you can run lean and move higher into the 200ft area. It gets hairy as you get leaner and can do engine damage. The only time that I've seen the 300ft range is with ethanol in our bracket car. A normal ethanol car will equal the 300ft per .01 area. If you don't see these numbers or if your car isn't consistent , you probably have a problem that needs correcting. __________________ Richard Grant 4988 STK

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