When Freiburger was attempting to explain carbs having greater dyno results than fuel injection, he suggested that the extra fuel from carbs could cool the induction-wouldn’t that change your fuel flow standard?
No. You look at how many pound per hour of fuel you burn to make 1 horsepower. It’s called:
Brake
Specific
Fuel
Consumption
The standard is it takes .5 pounds of fuel to make 1 horsepower for 1 minute.
Your BSFC would be .5.
Today, even decent engines have BSFC rates of .45ish and at one time I heard nascar was dipping into the .39ish range.
At any rate, if the engine is burning enough fuel to make 400 hp and the dyno says it’s making 500 hp you know there is an issue.
When NHRA pencil whipped the Dodge out of competition with the fuel and rpm rules, Chris McGaha did some testing of a Dodge on his dyno and after a few pulls he saw how much fuel it was using and he said it would never be competitive as the rules stood.
That’s how critical fuel flow numbers on the dyno are.