went to dyno again today and after doing pulls, I have lost 3whp and 4wtrq...

Now my question is, could a 32degree difference in temperature cause this big of a swing?
This an NA engine. I was thinking maybe so. But wanted to know if anyone knew from experience.

The only change from the higher power pull and the one I just did was I swapped the muffler to a shorter straight through muffler.

 

Absolutely.. a 32 degree difference is a pretty big change and will most certainly affect the actual power output of the motor (before corrections!).

 

I was reading that 1.5% for every 10 degree's over 64 is what people use for correction..
This sound right?
It does fix all my numbers.

 

Don't worry about it... Seriously....

 

I'm not worried about it.
I just want to better understand and learn from what is going on.

Everything I do is to learn and grow not to just make power.

I was actually happy with the results, I lost the power but I was better able to smooth out my torque and create a more linear power band that holds longer to my redline.

This leads to why I ask about tempatures, if I'm down 4wtrq because of tempatures than I know I can expect it to come back and with my torque curve the way it is now means I'll have even more power than before this last dyno session.

 

I looked at all my past dyno's and it's seeming to be consistant. On the days close to 64F I was making on average 3-5wtrq than the 85+f days.

What was amazing was the difference in A/F's between the days.. Surpised me.. All though I know on hotter day's less air density leads to richer exhaust.. but still it was a big difference