If one day your quad made 68.2hp, then a week later it made 66.1hp, it can just be the change in the weather.


On back to back runs, your numbers can vary .5hp anywhere. There are too many reason's why.
When I was on the dyno, we would do 3 runs in a row then look at the data.

If weather is causing hp swings on your runs, you have a bad dyno tower. Specifically your "ATMOSPHERIC SENSING MODULE" built into the tower. Call 1-800-992-3525 ask for Bill. He'll give you the repair order number to put on the box for shipping. It's $150 to completely refurbish and calibrate your tower. Doesn't matter what part it needs or if it was hit by lightning still $150.

Three runs in a row work super. There are alot of reasons why for sure. I gave you a list to start with. If you don't care or are not that serious to find out why, I'm fine with it. I didn't want to know anything about a dyno, all I wanted was more HP. Then I realized I needed to know way more about the dyno then the motor I was trying to make HP on. If a motor comes in down to 66hp and it was 68hp week ago. It's not leaving until we know why. Now I even have two dyno CPU towers next to each other. If I do have erratic data, I unplug, plug in the other (rule out one thing at a time).

I'm not buying or selling anything. I don't really know anyone here. Just reading graphs and talking about stuff that may help, thats all