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This past weekend in Bowling Green, it seemed in general the et's where not as low as, at least, I expected. I looked up the elevation and the airport is at 547 ft. Also it warmed up into the 80's on Saturday, which obviously did not help either.

Any opinions or is there a generalization on how altitude affects et's?
 

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Density altitude is what you need to keep an eye one, not the actual altitude.

The higher the d.a. the less power you make and the slower the et/mph.

I have a formula that I did post here that lists power loss per 1000 foot and also temp. A search should turn it up. I am too lazy to find it myself right now.



 

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You need to look at density altitude to get corrected elevations based on actual elevation/temp/dew point/baro pressure, then you can relate that to horsepower. This is where aviation and racing agree
Density altitude correction: http://www.wahiduddin.net/calc/calc_da_em.htm

I did some looking and weather history. Check the date we were at Steele Al to see if it is correct ( I could not find my time slips)

1/10/04 Steele Al. 2pm
Elevation:569 temp:37 DP:25 press:30.37
corrected elevation: 1234 BELOW sea level mmmmmm good

4/17/04 Bowling Green Ky V10 nats 2pm
ele:547 temp:80 DP:64 press:30.25
corrected elevation: 1859 above sea level

Bradenton Fl. V10 nats 2/8/04 2pm
ele:31 temp:59 DP:30 press:30.35
corrected elevation: 378 BELOW sea level mmmmm good

A quick calculation based on those corrected elevations:

If a car had 500hp/rwhp at Steele then there would be a 55hp loss at Bowling Green and 40hp loss at Bradenton.
 
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