Ok so my car should be here tommorrow (crosses fingers) BUT in the mean time I was handed the shipping manifest for my new car!! Thought you all might like to know a few things as measure by GM at the factory! The shipping weight of a 4 door SS automatic with a sunroof is 2935 pounds, yes its exact it has to be for the railroad to ship it.

Heres the one that floored me......HP: 193* !!!!! (* said, measured at the crank) Now true enough that is measure at the flywheel but aren't these things rated at 170something? I knew GM underrated their engines but by 20 HP?? Holy Crap!

Anyway just thought you'd be interested in what they are REALLY putting out from the factory.

 

Wow, way off

 

I believe SAE horsepower ratings are measured at the wheels, hence the difference.

 

I am sure they are measured at wheels out the factory.

 

1) That is one fatass car. I thought the SS/SC was supposed to be heavier than the 2.4. My SS weighs 2990 with a driver, and I sure as hell don't weigh 55lbs.

2) That HP even at the crank is way off. SAE measurements are at the crank, because I've seen several 2.4 SS dynos and it seems they have about 150-155 to the wheels. 193 would put it at about a 20% drain in power through the drivetrain...that's completely unheard of and, to me, unacceptable. 171HP is almost dead on for the 2.4 at the crank.

 

HP ratings can change like you change your underwear.

 

Too true

 

I never change my underwear lol jk

 

Don't see how the numbers can be off as they are straight from GM on the engine that they put into my car. ::::shrug:::: I know you've all seen tons of BS on the internet and if I had a scanner I'd post it for you all to see. Not BSin you just posting what GM says is all.

As for the weight, again I can't see how it could be wrong as thats the shipping weight as provided by GM for CSX (railroad) And again its for a 2.4 SS sedan with sunroof and an automatic, not sure what yours is so I can't tell you.

 

that basically means there has been a mistake...think about it. you would be running high 14's all day if you are a stick. They also don't dyno test each engine that comes off the assembly line.

 

if sae was measured at the wheels, my car would run pretty much perfectly even with an ss/sc because i would have 240 lb ft at the wheels and 210 at the wheels. friends on the mustang forums that have dynoed about that run mid-low 14's. When gm, ford, or any car company for that matter says your car has ____ horsepower- they are measuring at the crank.

 

They *could* measure at the wheels, but what looks better to the general public, 171 hp or 150 hp? Someone fat-fingered the document you have.

 

Yup, horespower ratings are done at the crank, whether it's SAE or not. SAE is just a correction algorythym to take things like temperature, humidity, barometric pressure and other into account so you have the same rating regarldess of the climate.

Keep in mind that underrating cars is nothing new (same for overrating). Don't think for one minute that a 1967-68 Corvette with the 425hp 427 was only making 425hp. Same goes for the 1st gen camaro Z/28's...290hp? Give me a break.

 

Yeah with the new SAE corrections implemented in 2005 cars like the Corvette actually gained about 5 rated HP and Toyotas lost about 20.

 

they did bump the 2007's up to 173 from 171 but not 193, thats a typo

 

According to the Chevrolet website http://www.chevrolet.com/cobalt/ , HP for the SS has gone up from 171 to 173 for the 2007 model year.

 

American cars UNDERcompensate while Foriegn cars OVERcompensate!

 

Yeah! my buds civic is overrated, and hes pissed,because its a torqueless wonder,he wants a balt or G5 but hes in a lease

 

20% drivetrain loss is acutally a common estimate for automatic transmissions. Manuals are usually estimated at 15-18%.

 

Don't understand. Why would a shipping ticket list the HP ?

 

unless it didn't stand for "horsepower"

 

when I weighed my car at the track, it came in at 2865 lbs. Weird on the hp tho.

 

well yours is a coupe--we are lighter then 4 doors.

Its just a misprint plain and simple. Hard to beleive some people think SAE net hp is measured at the wheels by autobuilders Never has been, always crank

I was looking at an 85 T/A the other day. IT had factory installed Recaro seats. I saw the factory buildsheet---said "Ricaro" seats! GM mispelled RECARO! Misprints and typos happen.

 

Meh, I guess it could be a typo who knows. But my Cavi ran a best of 14.7 and if this feels the same till I can get it to the track then I don't know.

And aren't the 2.0 supercharged cars all dynoing higher then the factory rated 205?

 

I work for CSX =) ... no wait that sucks =,(