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Another factor is the manufacturer of the dyno. Dynos can be as much as 5% different from each other. Some dynos even have conversion tables to show what this particular manufacturer's HP would be using other dynos.

If you compare a "high rating" flywheel dyno to a "low rating" chassis dyno, the HP difference becomes greater between FWHP and RWHP. There are no standards for the regular guy. The manufacturers have their own standards.