Two things about dynos:
1. They are good as a before and after tool. Basically, dyno the car, do a mod and then dyno again and look @ the delta, ie, change in the area under the curve.
2. Use correction factors only when comparing dyno numbers that are done @ two different time periods on the same dyno. Correction factors keep temp/baro/humidity variables constant so the numbers become more meaningful. Use uncorrected numbers when you do one dyno session.
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