sasquatch said:
Euro ZX3: I think the ATX in our cars takes more than 15%, more like a 20 to 25% power loss, plus the temperature was a lot less than the first time I had her dynoed, it was 66 degrees when I had it done.
Temperature - WHAT? This raises a significant question: were the numbers you posted "corrected"? Basically, what that means is, a mathematical formula should have been applied to the raw dyno numbers to adjust them to so-called "standard" atmospheric conditions.
You see, air that is colder and drier is more dense. More dense air means more oxygen in the cylinders for each combustion cycle, which means more power. A dyno run on a 90F day is going to produce lower numbers than a dyno run (identical car) on a 60F day. The mathematical formula is used so the numbers will come out the same.
If no correction was used, part of your reported gains are simply due to the cooler air.
I should probably mention that altitude plays a major role in air density too. Assuming you used the same dyno both times, altitude didn't change, which is why I neglected to mention it earlier.