Even if that is correct, it will present you with gross hp--not net hp at the flywheel. Which is how engines are rated.

 

That is the way it is done. Period. As for the gross and net, how can you lose 45 hp from the crank to the flywheel (while not losing any torque), considering their close proximity?

 

Belt driven accessories and many other things factor into parasitic loss.

You lose anywhere from 30-50HP, Crank horsepower is SAE Gross, many 60's muscle cars are rated at 400HP, but they were rated in SAE Gross. They were dynoed with no accesories, open exhaust, and in actually could have put out 100 less HP in the real world. Gross is not accepted anymore because it wasn't honest.

SAE Net is the standard today in HP rating, it takes in account the engine running with ALL accessories, exhaust manifolds ETC, anything that would take away horsepower.

Rear wheel horsepower takes SAE Net horsepower, and factors in drivetrain loss (transmission, driveshaft, etc etc)

LS1's dyno like 290RWHP bone stock...it's just not a fair battle putting stock L98 vs. stock LS1

 

Ok, I can got with that but it still doesn't answer why it doesn't lose any torque in the process.

BTW, I have seen in a few places around the web that the power output readings were taken at the rear of the transmission on a 3rd gen, not at the flywheel.

Don't know if that is true or not. Anyone got a clue?

 

There is rear wheel torque as well...again, 10-20% drivetrain loss.

 

i know this isnt a ram air message board but im about to put a smile on the believers faces and ruin the non believers day. my mods are listed unde rmy signature but ask yourself this. from a 55mph role can a lB9 beat a 94-98 mustang gt. well it was about 49 degrees monday night and i have the sheet metal ducting ram air that is professionally built and i got a hell of a boost on the highway and i wasnt doing more then 55 and i never felt a boost more powerful in all my time it helped me beat a stock gt and it works. weather its cold air or cold air going into the motor bieng rammed it ****in works its the cheapest most worthwhile mod anybody can do on thier tpi motor. this is my believes you cant prove me wrong it happened to me

 

Good work on the GT....but I refuse to believe the word of a handful of people who go out and spend money and swear they feel a difference when physical and mathmatical fact states otherwise.

Its funny because when I talked to my boss one day a while back talking about making my Iroc hood louvers "functional" to open and close with my throttle to give me ram air, he told me ram air wasn't important and began drawing the very "nozzle" that dave rodabaugh explans http://www.vetteguru.com/ramair/

There I am standing in a parking lot watching my boss draw that very "divergent" nozzle as he tried to explain why packing factors prevent ram air from being practical on a car. A few days later I go into "Advanced Tech" and being reading that article and the thread that followed. If it were just people online arguing I probably wouldn't feel as strongly....but I have to believe fact over what people "claim" to feel.

Maybe the fact that my boss is an engineer, an obsessive F1 fanatic, math god, and former owner of a dyno shop makes me believe him over whatever anyone "feels"

 

well i felt it big time and i spanked a mustang gt im so proud

 

Well the stock 3rd gen setup with the Y into the TB is a pretty restrictive design, so I wouldnt' be surprised if the combination of cold air and less restriction got you more power, but it wasn't the "ram air effect"