Okay its not a riddle

Heres the problem. Buddy of mine has an 06 Cobalt S/C SS.
Mods are GM Stage 2, GMPP Exhaust and Injen CAI.

Track is Race City in Calgary, Alberta.

I got these numbers to correct to sea-level

(26% humidity, 30" {pressure} mercury, 69F, 33.8F dew point using a 3350ft altitude)

I used the folowing sites to correct the altitude.
http://wahiduddin.net/calc/calc_da.htm


4716ft is the air density altitude I figured out.

Plug numbers in here:

http://www.modulardepot.com/density.php

14.23 @ 101.49 2.29 60 foot at Calgary = 13.36 @ 108.13

NHRA site at 4700ft = 13.4@ 107.7mph

Very close to agreeing.


Here is the question: It is well known that forced induction cars do not lose as much power at higher elevations compared to NA cars. So when lowering elevation they do not gain as much back.

How do I correct for a supercharged car??

Idiot kids at an unnamed sire say theres no way it 1 sec difference.
I say its damn close.

thanks!

 

From what I've read, turbo or supercharged engines only use 1/2 the corrected formula. If your calculations say you will drop a full second at sea level then you're actually only going to drop about 1/2 a second.

So theoretically, your 14.23 pass at altitude would only be around 13.79 at sea level. The only way to know for sure is to get to Mission when the weather is favorable for a low DA.

 

Yeah I went there once....it rained Might try again though.

So my calculations look okay for a NA car? I was a bit surprised that its 1.0 off sea-level. I thought 0.8 was pretty normal.