First of all, I'm a new member here. I plan to get an 05-06 within a couple years, but right now I'm finishing up school so no money for that kind of thing. I'm sure I'll have a few questions later, but for now I just wanted to let you know that Pontiac's GTO site may soon have fixed horsepower and torque @ rpm ratings .
Here is an e-mail I sent to them awhile ago through their website comments:
Clarification #1: On your website under specifications, you quote the GTO as having 400 hp @ 5200 rpm and 400 lb-ft of torque at 4000 rpm.
On the main GTO page towards the bottom, it says the GTO has 400 hp and 395 lb-ft of torque, 5 lb-ft different than the specifications page.
Clarification #2: As I stated earlier, you quoted that the GTO makes 400 hp @ 5200 rpm and 400 lb-ft @ 4000 rpm.
If it's the exact same LS2 engine as the Corvette with the exact same horsepower and torque ratings, why is the Corvette rated at 400hp @ 6000 rpm and 400 lb-ft @ 4400 rpm?
Also, in a comparison article in Car and Driver magazine with the GTO vs. the Mustang. The GTO was quoted at 400 hp @ 6000 rpm and 400 lb-ft @ 4400 rpm, the same as the Corvette rating the Chevrolet site gives.
Finally, the LS1 in the 2004 GTO had it's maximum horsepower rating at 5200 rpm and it's maximum torque rating at 4000 rpm. Is it possible that the GTO specification sheet was not given the updated engine rpm information when the model year changed from 04' to 05'?
They responded today with:
Thank you for contacting Pontiac and for your interest in the 2005
Pontiac GTO! You are correct that the Pontiac website does show
conflicting information. Thank you for bringing this to our attention. We have
forwarded this to the appropriate departments in order to rectify the
You are also correct that beginning the 2005 model year the GTO and the
Corvette share the LS2 engine. Therefore, the correct horsepower and
torque specifications for the 2005 GTO and the 2005 Corvette are the
same. The peak horsepower of 400 is reached at 6000 rpm and the 400 lb-ft
torque is reached at 4400 rpm. This would indicate that the engine
ratings that Car and Driver provided were correct. It is possible that
the information was not updated appropriately from the 2004 model year on
our divisional website. To assist you in the purchase process you may
also utilize www.gmbuypower.com
or contact your preferred Pontiac
dealership. While you are at the dealership, we recommend you take a test
drive. There is nothing like a test drive to help make that ultimate
We hope that this information answers your questions. If you need
additional information or have further questions, please let us know via
email or by calling Pontiac at 1-800-762-2737, between 8:00 AM-11:00 PM
Eastern Time, seven days per week. Again, thank you for contacting
Customer Relationship Manager
It's not updated yet, but hopefully they will soon. It always bugged me that they had the wrong specs for so long and didn't notice. At least I know that Pontiac is mainly responsible for the badging and that Holden actually built the car, or I'd be worried.