There is not formula that can predict what you would've made. Dyno measure horsepower with respect to the calculated gear ratio. Meaning you make virtually the same power if run in 3rd, 4th, or 5th. However you will make slightly more in the 1:1 gear since it is a much more accurate measure of rwhp since the pull takes longer, it effectively creates more resolution in the graph.
You probably would've made 4-5rwhp more in 5th, assuming the tune was safe. Alot of competitors will tune in a lower gear, and when the car is later dyno'ed in the 1:1 it will knock because of the extra load/time spent under load.
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Rob Harper
Call: 678-297-7770
rob@topspeedtuned.com
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