Could somebody explain to me about correction factors and why they are used when dynoing a car (or point me to a reference)? I gather that they are used to normalize dyno data to a standard air temperature, hunmidity and pressure, is that right? What is the difference between standard and SAE correction factors?

 

You just answered your own question

Standard numbers are uncorrected and SAE numbers are corrected back to standard conditions.

Standard conditions are 77F and 29.235 in-Hg


If you test on a 110F day at very low pressure, your numbers will be lower than realistic without correction. SAE correction brings the numbers back up to "standard conditions". Vice versa for an extrmely cold day and high pressure.

 

Okay, that's what I thought. So I take it the SAE has a table of correction factors to be used? Where can I find them?

 

I thought I read somewhere about 4 different correction factors available to apply to raw data. SAE was thought the most conservative.
Here's some links (sorry no tables)
SAE Formula
SAE Calculator