HP > RWHP vs Flywheel HP
HP > RWHP vs Flywheel HP On the RAM AIR hood (and other places on various other F-Body's I've seen) some advertise their HP number, i.e., 415 HP. I've asked some of these owners which it was they are advertising ... RWHP or Flywheel HP ... and have received mixed answers. The answers are flat out RWHP, which I believe is what should be advertised IF you are going to flaunt the number. The other answer is that it's their RWHP + the added drivetrain loss of 12-15% for M6 cars and 18-20 % for A4 cars. Not counting A3's ... lol! 
Is there a standard anyone knows of which would be the correct way to advertise? I say it should be RWHP, however, is there a reputable documented standard? I'm not talking about 'advertised' (flywheel) HP the auto manufacturers use, which are usually distorted for one reason or another. Anybody know a true standard documented standard you can quote?
Is there a standard anyone knows of which would be the correct way to advertise? I say it should be RWHP, however, is there a reputable documented standard? I'm not talking about 'advertised' (flywheel) HP the auto manufacturers use, which are usually distorted for one reason or another. Anybody know a true standard documented standard you can quote?
I'd only advertise it if it was dynoed on an engine dyno to the strict SAE specs that automotive manufacturers are held to. Otherwise, it is a shot in the dark, and obviously leaves room for ego inflation.
Originally Posted by Mistacamawo
I think writing your hp number on your car is pretty lame
I would imagine most would put on their rwhp since most cars dont see and engine dyno and that number would just be a guess. Most people dont seem to care about flywheel hp, its what you put to the pavement that matters
Keep 'em comin' ... good feedback folks. I saw one at local a shop here that has 415 HP on the hood, but, it's actually putting down waaaaaay over 500 to the wheels. Didn't make much sense to me. Nah, I don't think I'll do it to mine, but, I think it looks pretty cool to see one with BIG HP numbers on the WS6/WS9 hood ... like 725 HP .. if it's at the wheels and true numbers.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Mine's been sleeper since I've owned it and will likely stay that way. Just doing appearance mods now. Then, I 'll put a badass stereo in it. Mod's never end, I guess. doubt I'll add the HP numbers ... will do the ram air stickers when i get my new hood on, though. Ordered a new airbox to make it functional ...
personally, its fun to hear the different ideas people have about my car. I love when people tell me that they heard from someone who heard from someone who heard from his momma that I have 500 at the wheels. 
Then theres always the two or three guys that believe the Ls1 was only 275 from the factory. Why spoil the fun, just let them find out for themselves 
On a note about sleepers, it was William Shakespeare who said, "Have more than thou showest, speak less than thou knowest....
Then theres always the two or three guys that believe the Ls1 was only 275 from the factory. Why spoil the fun, just let them find out for themselves On a note about sleepers, it was William Shakespeare who said, "Have more than thou showest, speak less than thou knowest....
I don't think there is going to be any "official" final word on this - we all know RWHP is all that matters - but - I think with every car commerical you see on TV spewing inflated flywheel HP #'s, you're almost forced to use flywheel HP...
