Horsepower Rating
Tech Contributor
Joined: Aug 2008
Posts: 2,902
Likes: 21
From: Oak Hill Virginia
There are, in fact, cases where manufacturers understate the power of their offerings. As uncouth as it might be to mention on a Corvette forum, the new Boss 302 Mustang has chassis dynoed within 30 hp of its advertised (flywheel) rating, way out of line with the "15% loss" rule.
Safety Car
Joined: Oct 2004
Posts: 4,816
Likes: 132
From: Plano TX
There are, in fact, cases where manufacturers understate the power of their offerings. As uncouth as it might be to mention on a Corvette forum, the new Boss 302 Mustang has chassis dynoed within 30 hp of its advertised (flywheel) rating, way out of line with the "15% loss" rule.
Last edited by David426; Nov 8, 2011 at 06:14 PM.
Melting Slicks
Joined: Jun 2010
Posts: 2,809
Likes: 3
From: Yorktown Virginia
I think the only way to actually determine if the manufactures claim is high or low is to actually pull the engine and put that on a dyno as we are just taking the manufactures claim as fact and using that to figure the parasitic loss in the drive train.
Le Mans Master
Joined: Mar 2002
Posts: 5,955
Likes: 161
From: PNW
I believe in today's world, the manufacture's have their engine dyno numbers certified by outside agency. I thought I read that someplace ... so they just can't "make up" numbers.
Melting Slicks
Joined: Jun 2010
Posts: 2,809
Likes: 3
From: Yorktown Virginia
Even if that is true each engine is going to have a different output. Also doesnt the GTR dyno somewhere in the range of 10-15% parasitic loss which seems a little hard to believe as it is awd and auto. But then again I could be mistaken on the numbers as its been a long time.
