So in jan, i got my car tuned and it made about 250whp, now yesterday i had it done again and made around 220. Frist tune was in about 50* weather and yesterday was about 90*. Is there a such thing as a conversion table to reference this stuff with?

 

Here is the SAE J1349 JUN90 correction factor formula. There are also others, but it should give you a rough estimate:



This site also has a calculator that uses the same formula: http://www.ajdesigner.com/phph...f.php

 

The dyno software should have a correction factor for air conditions.But correction factors can only go so far.Was it the same dyno and operator?

 

yeh i agree, but if it was on a roller dyno (like dynojet). There are more factors. I tuned my car one day and made 219 whp (all motor) and i adjusted the position of the car, it was off by alittle bit and it made 225. i let it sit for a few minutes and ran it agian without any changes and it made 231. There are so many factors like if the car is well aligned and the tires (if they are warm or cold - tire pressure)