Cool weather tune up?

Jim...What calculator are you using? I have seen that the tracks elevation is 850'-889'..

850-900 ft elevation sounds about right.

There are a few, but this one has track's listed for elevation and "estimated" conditions for any day. After using their estimate, you can change the numbers to actual track and hit calculate again. The big thing is putting in the correct barometer, some calculators want "aviation" barometer and they correct to track elevation. Others want actual track barometer (most), or you can put in zero track elevation and actual track barometer.

Drag Times calculator

Also:
http://wahiduddin.net/calc/calc_da_rh.htm

And the tons of them at Wallace Raceing:
http://www.wallaceracing.com/adi.php

I used the Drag Times one,Jim...That is how I got my numbers from the last time out..

Yes, Drag Times uses the reported barometer (which is corrected to sealevel). They have the track's elevation and their calcuation changes the reported barometer to actual barometer based on elevation (like I did).

And their numbers are useful if you have no track measurements. But since they are not temp and humidity from the track, they can be off the actual due to local conditions:
-the airport cools/heats faster/slower than the track
-the track's pavement (acres) might cause locally higher temps
-the track's location might have different humidity (nearby river, lake, etc.
IMO, the baro correction is pretty good (if the track elevation is correct) since that doesn't change much over 10-20 miles. But clouds can shade the track (or airport) and with the pavement have 5-10 degree different temps (worst case)

I may go back thru my logbook and put some figures in from warm weather...That may be interesting!!

Here is an example Maryland International Raceway, 10/8/2011, 11:30 am:

Actual track measurements: 69ºF, 43%RH, 30.45"Hg, calc 184 ft DA (80 ft track elevation).

Drag Times: 66ºF, 56%RH, 30.54"Hg, their calc 33 ft DA (87 ft track elevation)

-------------------------------------------------------
9pm
Track Measure: 54ºF, 97%RH, 30.39"Hg, calc -690 ft DA
Drag Times: 52ºF, 82%RH, 30.49"Hg, -881 ft DA

The other thing to note was that the actual performance didn't change as much as the DA might indicate. A 900 ft change in DA might indicate an ET change of 0.09 seconds (gas, normally aspirated), but nobody saw that much. That is my feeling about the equations not reflecting the actual humidity effects.
FWIW, my car went 5.778 at 11:30am and 5.794 at 9pm. (not bad)
All runs (in order) 5.778, 5.790, 5.788, 5.790, 5.792, 5.794 (lost -0.001 red)
Gas cars change more due to temp, alcohol due to humidity.