Ya i know its 145 but has anyone dynoed there base model yet? Is there a chance that GM underrated our car?

 

I think I saw somewhere that FWHP is in the low 120s to high teens. Cannot find where I saw this, but I know it was low 120s.


Red_Wing_2121

 

Some where I heard it was actually dynoed around 117. But there is an article in November Car and Driver on new crank horsepower dyno standards saying GM under rated a few of their vehicles. It also says Honda and Toyota may have over shot theirs.

 

Here's a link to the Injen dyno chart of the 2.2L Cobalt 2005 before and after their intake. They don't say what type of dyno this is though. Also thjat's a pretty big 19% drop in power, seems kind of excesive for a FWD car.

http://www.injen.com/7024_mkt.html

 

mine dyno'd at 127 WHP. It's an automatic too .

 

How often do cars perform lower than their suggested stock HP? I kinda feel robbed by not havin even 130 horses

 

stock hp is at the crank w\out ac your always gona lose some through the drivetrain and havin the ac attached it just how much is the question

 

That's a much better 12.4% loss. If the 2.4L sees the same % loss you're talking 150 HP to the wheels.

The new SAE standard actually requires dyno testing with what the final components will be on the engine for production. I even believe it requires the AC unit to be in place if AC will be stock on the vehicle. So engines using the new SAE standard come much closer to the real flywheel HP you would see if you did a flywheel dyno of the engine in your car, instead of a naked engine sitting out for testing.

 

You only lose horsepower when the AC compressor is on! Having one "attached" does not affect power!