that generic dyno sheet was probably used to show it's max potential and since that is the rating for the other 3 models that use this kit they are going with the majority. the cobalt gets the 280 rating because of it's flattened upper charge pipe because it doesn't have the same space under the hood as the other three models (sky redline/solstice GXP/HHR SS)

it's right on CED site

Cobalt 2008-2010 HP & Torque ratings:
280HP @ 4,700 RPM
320 lb,-ft of torque @ 4,300 RPM
Kit disables "learn down feature"
This performance upgrade maintains no-lift shift feature on Cobalts and HHR's and adds it for the Solstice/Sky.
Note:

Solstice SKY HP & Torque ratings:
290HP @ 5,200 RPM
MT 340 lb,-ft of torque @ 3,600 RPM
AT 325 lb,-ft of torque @ 3,600 RPM

HHR HP & Torque ratings:
290HP @ 5,200 RPM
MT 315 lb,-ft of torque @ 4,800
AT 315 lb,-ft of torque @ 4,800

 

So far the only mods I have are the Dejon intake, ZZP downpipe with flange and Hahn Exhaust. Don't know if those factors make it a sure 290HP?

 

well since learn down is IIRC reduced or eliminated all together with GMS1, yes it will probably boost it a bit.

 

I dyno'd at 285 on GMS1, 91 octane and fully bolted. Didn't get a tq number unfortunately...
Numbers in my sig are on E85 with Terminator tune at 26psi

 

you drive a 359hp FWD car in the winter? you sir either have a set of brass *****, or a winter tune. haha

also OP needs to keep in mind that those numbers are crank HP numbers advertised... not the dyno numbers at the wheels we are posting. so the numbers given by some members are pretty close to the driveline loss estimates.

 

Dynod 269whp - 289wtq with intake charge piping gms1 . Can't wait to see new numbers with new tune

 

Is the higher peak torque from a small displacement engine with a turbo like the K04 really a surprise? Those are just peak numbers. The HP is so much lower because the torque is relatively short lived.

 

lol proof or GTFO, I got 293/340 (wheel HP/TQ) with HP tune + catback + k&n drop in.. no way ur getting that with all stock + gms1.

 

nope,the hhr ss has the same flatten upper cp. i use to own two of them,now we are down to one.

 

also you have to take in account where you live. down here living next to the gulf at/below sea level, we will read higher than someone in denver, as an example. that's why royal purple raceway is considered one of the faster tracks by nhra because of the sea level.

 

I do use my GMS1 tune in the winter, but only because the car won't start on E85 in the cold.
Winters in Colorado are cold but sunny so the road surface is mostly dry; snow melts away in a day or two so 359hp is no problem. In fact, on Sunday at the local road track I'll be on my E85 tune

I wish. Dyno numbers are typically corrected for altitude and barometric pressure. Quarter mile numbers will obviously be faster at sea level, but dyno numbers should be comparable.
If not I'm probably making 400whp yay lol

 

interesting...

then odd that the other GMS1 cars make more power and torque than the balt.

 

IIRC the HHR and solstice have a better stock intake than the cobalt does ..... the flat part of the upper charge pipe isnt the reason IMHO.

 

ah that could be it. i remember hearing something about the intake system. always assumed the squished upper charge pipe would fall into that category.