Yes, those corrected times for your cars seem way too fast for the mods you have. What was the d.a. on the days you ran both of the times in your sig? I have found the NHRA corrections to be right on for my car. I ran a 14.0 at 101 at sea level and a 14.8 at 96 at 4000' elevation in the same kind of weather both places (though I didn't know the d.a. either time).

 

Yes, stock for stock they are a very close race. But, I think the 300z tt looks 10x better and mods way cheaper and easier.

 

Very well said , But , wouldnt it bother you if you knew your car had potential to run 8 tenths better , and would have in better conditions ? It would me . I agree w/you to an extent with the corrected time in the sig . It gets old hearing it . But like you said , just put the DA in sig and leave it at that . Because there is no way to prove a dead on time of " what the car would have ran " In other conditions .
Not taking either side because I see the point that both sides are trying to make .

 

Yeah, these corrected times are too fast and I doubt I would ever see these times out of either of my cars, as they sit. I wish I had the opportunity to run in 0' DA (or negative DA for that matter) just to see what kind of difference it really makes.

The DA when I ran the 12.6 in the Z28 was 5000', and 4800' DA when I ran the SS the other day.

 

Ya know Steve why for a Mustang guy you seem pretty smart

Just picking on ya buddy.

 

I bet those d. a. figures are off. What was the temp., humidity, barometric pressure and altitude on your track that day?

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

Let's plug in the #s and re-check the density altitude, shall we?

 

The DA numbers aren't incorrect man. I don't remember the exact conditions from those days, but when I calculated them (using another online calculator) I got the 5000' DA and 4800' DA. The numbers are correct.

For example, today is a relatively cool day and the DA (using your calculator) is 3600'. It was 94 the day I ran the SS and much hotter than that when I ran the Z28 to a 12.6 (was probably around 100-102*).

Right now, with 84* weather and the other given conditions from weather.com, the DA is 3600'. Here are the conditions so you can see for yourself:

Elevation: 1300'
Temperature: 84*
UV Index: 1 Minimal
Dew Point: 39°F
Humidity: 20%
Visibility: Unlimited
Pressure: 29.67 inches and falling

Just changing the temperature to 94* (how hot it was the other day when I ran the SS), the DA is 4221'. During the spring/summer, the DA here is rarely below 4000'. Maybe this is why I have a hard time when these guys correct their numbers because my cars still run good and I run in 4000' DA all the time.

 

Yes your cars run very well at that d. a.! Most of the time I race at 4000' elevation and all the cars run like a** up here. Stock LT1s run high 14s to low 15s. Stock LS1s run low to mid 14s. I run high 14s to low 15s without the last round of mods. Stock 5.0s run mid to high 15s. Seriously modded 5.0s with heads, cam, intake, exhaust, slicks, gears, weight reduction, etc. run low 13s. Talon turbos with 16G turbo, intercooler, and supporting mods run low 13s. Our d.a. is usually 6000-8000' in the summer here.

Obviously if you corrected your times for d. a. you would have the fastest cars with those mods in the Country by far! So it looks like correcting for d. a. is bullsh*t, at least with your #s and d.a. Correcting for altitude seems fair though. You would run 1 or 2 tenths and 1 or 2 mph faster if you corrected for sea level vs. 1300 feet, which would be very believable with your cars and present times.

Another thing, most of the wine and cheese rags correct times to standard atmospheric conditions and they never come close to times like yours would be corrected to standard. This is a strange thing. I don't know what is going on with your times and d. a.?? Maybe your track is shorter than 1320 or downhill?

 

Both the tracks here are NHRA sanctioned tracks and Firebird Raceway holds big events (ie, CSK Nationals) on a somewhat regular basis. There is no question about the elevation, the tracks are 1300' and they aren't down hill lol.

A local guy here (Verbs) is real big into correcting his numbers. He has a h/c LS1 that runs mid-high 11s @ 117 or so. He will actually correct his numbers for DA and say he runs high tens @ 123-124. I don't buy these extreme corrections because I can't see him running on 0' DA weather and running a 10.8 @ 124, nor can I see my '97 Z28 runnin a 11.8 @ 117.

 

The only way to know for sure is to run in 0' DA conditions. It would be interesting to check how close the corrections really are.

Do you guys have strong tailwinds at your track? That makes a big difference in e.t. and trap speeds at my track when the winds blow.

 

There generally isn't much wind...maybe 5 mph on average (if that), but the air is pretty still most nights. I would like to run in 0' DA conditions as well to see the real world differences.

This would make a good article for Car Craft, GMHTP etc. Take say, a mid 13 second, automatic car and travel all over the country - calculate the DAs and see the real world differences in track times.

 

That would be an excellent article!