I was so excited to get a G8 and now I see she'll only have 361 Horsepower? What happened to the LS2 of 3 years ago? LS2s are 6.0 liter V8s and you can still buy an '08 Trailblazer SS with one that rates at 390 horsepower and 400 pounds of torque. The GTO's died w/LS2s and C6s came out with LS2s for 400 horses.
The L76 6.0 liter only has 361, I should just stick with my charger and drive her into the ground. If I can keep it below 70MPH and faster then 60MPH, that car will average 28MPGs all day running on 4 cylinders. Around town it drops down to 20MPGs hauling 4100 pounds around.

'07 Charger R/T 360 HP(w/K&N) 40?Ib-trq, 4100 pounds, 0-60 5.7
vs.
'08 G8 GT 361/385 3995 pounds, 0-60 ?

Maybe there will be a GXP someday?

Because the LS2 requires Premium and the L76 in the G8 is tuned for regular 87 octane.

I'd much rather have a L76 than the LS2, because I want to mod my car and the L76 has much better heads/intake stock than the LS2.

'07 Charger R/T 360 HP(w/K&N) 40?Ib-trq, 4100 pounds, 0-60 5.7
vs.
'08 G8 GT 361/385 3995 pounds, 0-60 ?

Maybe there will be a GXP someday?

GM \ Pontiac says: 5.3 sec. ( est. )
- Ray
Driving a GM w/LS2 currently...

Am I correct in my assumption that the aftermarket sector for the LS engines are much larger than for the Hemis?

To the original poster, stock G8 0-60, around 5.4. Also the L76 in the G8 has cylinder deactivation just like the Hemi. With a 93 octane tune and an intake the G8 will see numbers close to 400.

As for the Trailblazer and SS version, it's on it's last leg and I really doubt the LS2 will see production into '09.

Am I correct in my assumption that the aftermarket sector for the LS engines are much larger than for the Hemis?

I believe so. And I've also heard that they have been a pain to unlock and tune.

"I should just stick with my charger and drive her into the ground."

That's what I'd do. Wonder how deep she'll go?:quoties:

The L76 has the intake off of the LS3 (450 hp) and the heads are LS7 (505 hp) derived, but with dropped compression (forced induction friendly :gr_devil:). There is a lot of potential for the L76.

I'll take the L76 with its vast array of aftermarket support over the Hemi any day.

I'm still rockin' the LS1, so this will be a bump for me :) The G8 will add a little weight. The extra 10 cents + per gallon back in my pocket is worth the 40 ponies, IMO.

"I should just stick with my charger and drive her into the ground."

That's what I'd do. Wonder how deep she'll go?:quoties:

Several G8's will be driving Chargers in the ground.:boink:

Several G8's will be driving Chargers in the ground.:boink:
Methinks you are correct Vert! LOT'S of them. And by the time most of us get a few mods taken care of and get 400+ HP out of the GT, we might even bury a few SRT8's too. Although I have yet to see one in the Pacific NW. :gr_jest:

You see, when you change around the internals of an engine alot can happen. A different intake manifold can significantly change performance. The air intake is pretty restrictive to keep noise down. Those combined with 87 octane are enough to take away ~30HP.

Methinks you are correct Vert! LOT'S of them. And by the time most of us get a few mods taken care of and get 400+ HP out of the GT, we might even bury a few SRT8's too. Although I have yet to see one in the Pacific NW. :gr_jest:

I rememeber in Car and Driver the GTO out ran the SRT8 in the 1/4 mile. So if we add 40-50 HP, the G8 will conquer the SRT8.:judge:

The LS2 is pretty mod friendly too!!! At least my TBSS thinks so :driving:

I rememeber in Car and Driver the GTO out ran the SRT8 in the 1/4 mile. So if we add 40-50 HP, the G8 will conquer the SRT8.:judge:
Oh yeah!

All the press I've read have listed the G8 0-60 in the low 6/high 5 seconds.

You guys will have a have a big problem with weight, the G8 is 3995 pounds, that's a lot. My Charger is a huge car and it only has 105 pounds on the G8.

The L76 is essentially the base 6.0 liter 2500 truck motor with the lower Vette intake. If I were to purchase a G8 I would rather wait another year for the GXP with the Vette's 6.2L.

On the other hand the L76 sounds like it's perfect for forced induction. We had some of the first GTOs hitting 9's and 10's in the 1/4 in Jersey at Atco running STS turbo kits. You can get these heavy Holdens to move but you're looking at about $6-30,000 to due so.
The Hemis respond really well to aggressive cams. The stock hemis have a really mild cam so their exhaust mods usually don't warrent much of a horsepower increase. A K&N intake on a Hemi will increase RWHP by about 20, that's not so much about the Hemi as it is Dodge's crappy engineering on the intake.
GM is on it and you'll probably only see 5-10 RWHP with a new intake on the G8. The newer GM MAFs do not get along well with the filter oil off the K&Ns either.

All the press I've read have listed the G8 0-60 in the low 6/high 5 seconds.


Pontiac is advertising the 0-60 in 5.3 seconds and that is with the automatic. Once the 6M comes out it should push the 0-60 down .2 seconds.

Pontiac is advertising the 0-60 in 5.3 seconds and that is with the automatic. Once the 6M comes out it should push the 0-60 down 2 seconds.

Wow.
That would mean 0-60 in 3.3 sec.
I want to see THAT G8...
[ j/k - assume you mean 0.2 sec ]

Pontiac is advertising the 0-60 in 5.3 seconds and that is with the automatic. Once the 6M comes out it should push the 0-60 down .2 seconds.

Then that's not too shabby then. Today's GM autos are faster then their manual counterparts FYI. The GXP Solstice, CTSs, are all faster with their 5-speeds vs the manual 5-speeds. It's not more then one tenth of second or two though.

FYI, as soon as the first Solstices were beginning to be delivered GM announced the GXP. We have Solstice GXPs, G6 GXPs, Torrent GXPs, GP GXPs, Just about every Pontiac model has a GXP.
I'm guessing LS3 GXP for 2009 with 425 horsepower, bigger brakes, tighter suspension, for $3-4K more.

for $3-4K more
That would be wonderful, but another member of this board allegedly talked with Pontiac executive at length about the G8 and he said that pricing will be low-to-high 40s. :whine:
Post 96. http://www.g8board.com/forums/showthread.php?t=515&page=4

Here's the Aussie GXP, Clubsport HSV:
http://www.hsv.com.au/Cars/ESeries/clubsportr820/clubsportr820.asp?ID=Engine
307kw/550nm trq = 411HP/405.6Ib trq (old LS2)
check out the brakes, suspension for GXP upgrades.

I would love a GXP with only an engine upgrade and some minor styling changes. As to the brakes, I'd don't really care. The GT should have pretty good brakes as it stands and I don't plan on needing killer brakes. As for the suspension, I'd probably get the Sport package on the GT but I doubt I'd want it any stiffer than that. I don't want to feel every bump I go over on the road. I would buy a GXP for around $35k base, throw on the GT's premium package and a moonroof, and be done at $37k. Others could tack on high-grade brakes, suspensions, etc. and get into low-40s while still others might choose everything and be in mid-40s. I think that would be win-win for everybody, but I'm not sure how much GM wants to configure each individual G8 or if Pontiac wants GXP to mean anything other than superior to base and GT in every possible fashion.

I'll probably most likely get a loaded GT and throw on a supercharger once I grow bored. It'll be faster than an LS3-powered GXP without significant (FI) mods.

That would be wonderful, but another member of this board allegedly talked with Pontiac executive at length about the G8 and he said that pricing will be low-to-high 40s. :whine:
Post 96. http://www.g8board.com/forums/showthread.php?t=515&page=4

You figure a fully loaded GT + $3-4,000.

Wow.
That would mean 0-60 in 3.3 sec.
I want to see THAT G8...
[ j/k - assume you mean 0.2 sec ]

Yep. I forgot the .:(

Yep. I forgot the .:(

I used to write COBOL programs on occasion.
Forget the period & the compiler 'spits up'...

I just thought it was funny...
But I really WOULD love to see a G8 run a 3.3 sec 0-60 time
[[ maybe someday ]]

But I really WOULD love to see a G8 run a 3.3 sec 0-60 time
[[ maybe someday ]]

That would be nice, maybe an AWD G8 with a blown LS motor.

I used to write COBOL programs on occasion.
Forget the period & the compiler 'spits up'...

I just thought it was funny...
But I really WOULD love to see a G8 run a 3.3 sec 0-60 time
[[ maybe someday ]]

Ever drop a stack of punchcards (FORTRAN) and just shove them back together out of order?

That would be nice, maybe an AWD G8 with a blown LS motor.

I wonder which engine to choose from LSA or LS9? I would like a blown LS2 that I saw on fifth gear with the Vauxhaul Monaro VXR 500. That car sounded nasty.

Hi folks,

First post on this board (mainly a camaro5.com contributer) but I wanted to toss some info on this discussion.

One of the main reasons the L76 'only' makes 362hp is because the AFM system lowers the RPM limit. If you look at the dyno charts for the L76 vs. LS3, you'll notice the L76 has a 6000rpm rev limit, where the LS3 goes to 6600rpm. Add to this the premium fuel, and the slightly smaller displacement easily explains the 90hp difference.

I think the LS3 will arrive in the G8 GXP with about 450hp once they implement the DI in it.

Anyway, great board!

~LSx

I wouldn't expect a GXP model of the g8. The GT model already has 361 horses and with the looming CAFE regulations it would'nt make much sense. A G8 with the ls3 or the ls7 is sure to get terrible gas mileage in the 14-15 city 20-22 highway range. It's not just the G8 that will suffer, I feel like other ideas for high performance models are going to be scratched also. The ZR1 may be the last great car out of GM's high performance division.

I wouldn't expect a GXP model of the g8. The GT model already has 361 horses and with the looming CAFE regulations it would'nt make much sense. A G8 with the ls3 or the ls7 is sure to get terrible gas mileage in the 14-15 city 20-22 highway range. It's not just the G8 that will suffer, I feel like other ideas for high performance models are going to be scratched also. The ZR1 may be the last great car out of GM's high performance division.Then you haven't seen the 550hp CTS-V unveiled at NAIAS and all over the mags. A GXP will be small enough production to be minimal impact on CAFE. Current GT is rated 17/24. 15/22 is not that terrible considering where it starts. And even dealers have some inside verification that there will be a GXP. I see some of your point, however, no reason they could not have had a 303 hp LS4 as a midpoint GT/GTP engine with the L76 as the top of the line. But that would only satisfy buyers who are/were not 400 hp GTO drivers.

Myself, moving from 240hp, 6.8 0-60, the V6 at mid 7s is a big step backward that the LS4 could have prevented. So, I'll take a L76 with plenty of family sedan hp on tap and go chase down some 550i's (yes the GT is quicker than). Consider also that the Rolex Pace Car carries a stock 361hp engine, no tweaking necessary to run at the front of the pack for 95 laps last weekend.

All the press I've read have listed the G8 0-60 in the low 6/high 5 seconds.

You guys will have a have a big problem with weight, the G8 is 3995 pounds, that's a lot. My Charger is a huge car and it only has 105 pounds on the G8.

The G8 is a huge car too. It has more room inside than a Charger.


The L76 is essentially the base 6.0 liter 2500 truck motor with the lower Vette intake. If I were to purchase a G8 I would rather wait another year for the GXP with the Vette's 6.2L.

The L76 has the same exact intake and heads as the LS3. And it's not the truck motor, it's an all aluminum motor.


On the other hand the L76 sounds like it's perfect for forced induction. We had some of the first GTOs hitting 9's and 10's in the 1/4 in Jersey at Atco running STS turbo kits. You can get these heavy Holdens to move but you're looking at about $6-30,000 to due so.
The Hemis respond really well to aggressive cams. The stock hemis have a really mild cam so their exhaust mods usually don't warrent much of a horsepower increase. A K&N intake on a Hemi will increase RWHP by about 20, that's not so much about the Hemi as it is Dodge's crappy engineering on the intake.
GM is on it and you'll probably only see 5-10 RWHP with a new intake on the G8. The newer GM MAFs do not get along well with the filter oil off the K&Ns either.

I was looking into getting Charger until I realized they don't respond to Mods as well as the GM LSx motors. I never found anyone with a Hemi that made tons of power on just a cam and bolt ons. Not like you can with an LSx motor. People in Australia are hitting 450+ WHP with bolt ons and a cam. The SRT8 might be able to hit that, but it will cost a lot more to do so. As for the K&N oil, that's only if you oil the filter too much. And it will cause problems on any car, not just GMs.

I was so excited to get a G8 and now I see she'll only have 361 Horsepower? What happened to the LS2 of 3 years ago? LS2s are 6.0 liter V8s and you can still buy an '08 Trailblazer SS with one that rates at 390 horsepower and 400 pounds of torque. The GTO's died w/LS2s and C6s came out with LS2s for 400 horses.
The L76 6.0 liter only has 361, I should just stick with my charger and drive her into the ground. If I can keep it below 70MPH and faster then 60MPH, that car will average 28MPGs all day running on 4 cylinders. Around town it drops down to 20MPGs hauling 4100 pounds around.

'07 Charger R/T 360 HP(w/K&N) 40?Ib-trq, 4100 pounds, 0-60 5.7
vs.
'08 G8 GT 361/385 3995 pounds, 0-60 ?

Maybe there will be a GXP someday?

Just add headers and a tune and you will be close to 400ph. Or add a cam in the mix and be well over 400hp.