[JSH]

CF works fairly well if less that 1000ft between dynos. It's primarily for use with weather changes within your shop.

The Society of Automotive Engineers (SAE) that publishes the correction factor (J1349), claims that it will be accurate when conditions are within +/- 7% (14% range). Beyond that, there will be some inaccuracy based on large changes in conditions.

At sea level, we will likely see a correction factor around 1.00 and at 6000' in Denver, it will be close to 1.35, which is a 35% difference. When adding a large percentage to a measured power value, this can make a large swing in corrected power. Since the correction factor also assumes 85% mechanical efficiency, if the engine is more or less mechanically efficient, then the correction factor may make more or less of a difference.

Bottom line for me:

I can't compare a dyno of my car in Denver to one in Houston. Dyno's are not designed for that condition.

I didn't know that.