G8 GXP Engine Specs

[Z28SSMAN]

Pontiac G8 GXP officially rated at 415 hp

Posted Sep 8th 2008 7:29PM by Damon Lavrinc
Filed under: Sedans/Saloons, Pontiac

The V8-powered Pontiac G8 GT has garnered a fair amount of respect around Autoblog HQ, with almost everyone who's spent time behind the wheel singing the praises of the Aussie-imported four-door muscle car. We're all suckers for rubber-melting torque and rear-wheel motivation, and even El Capitan Neff has thought about retiring his Alero for a shot at G8 ownership. For the rest of us, a six-speed manual would seal the deal.

Next year Pontiac will finally offer a proper cog swapper on its G8 GXP, and not only do drivers get to row their own gears, but they're getting an extra 13 horses and 15 lb.-ft. of torque to boot. The SAE has finally performed its official testing on the 6.2-liter LS3 V8 and output is up to 415 horsepower and an equal amount of twist.

With 19-inch HSV wheels framing 14-inch (front) and 12.76-inch (rear) discs and Brembo calipers, a standard LSD and a stiffened suspension, the additional power is just another reason to be smitten by the Pontiac G8 GXP. That, and the Tremac TR060 manual. We'll take ours in slate grey for maximum intimidation. Thanks for the tip, Torrent!

[old vette dog]

that engine seems pretty peaky on hp and tq being hp and tq cross at 5252 rpm The graph to me does not look right w other lsx sheets that I have seen. Bad ass car btw

[HOTCIVIC]

I really like the LS3. There are a lot of LS3 Vette owners coming out of the woodwork with 500+ rwhp with cam and bolt-ons on stock heads.

[old vette dog]

graph is fake

[MR.hp]

That is going to be one bad ass 4 door car can't wait to see what the people do with it on the street. Glenn looks like you going to have to up the output of the SS soon.

[Z28SSMAN]

graph is fake

I think it's not a typical dyno sheet we are used to seeing. I think it's more of a chart that tells us the maximum hp and tq numbers.

I agree that it doesn't reflect the flat power curve we normally see on LSx motors. The peaky hp graph reminds me of an old 98cobra s/c dyno sheet. lol

[Fast One]

Re-scale the torque curve to read 0-450 & it would probably look more normal. The torque curve isn't all that bad for a n/a engine - it has over 300 pounds from just over fast-idle through redline.