Besides the L92 heads and AFM its all the same here is a read for you.

http://media.gm.com/us/powertrain/en.../09_L76c_n.doc

instead of going back and forth all day with each question you bring up from each post knocking the engine/GT read this. YOu might just be suprised.

 

The difference is .2ltr and the DoD system (cam, lifters, springs, push rods, etc., also the valley cover is different)

Same intake manifold.
Same throttle body.
Same heads.
Same block.

The L76 is like a LS2.5.

 

Nobodies knocking the GT's L76, just praising the LS3. The GXP IS worth the extra dough, but not solely because of the motor upgrade.

It's the EXACT same conversation that the LT boys had when the LS1 hit. It's the same size, but ONLY 50 more advertised hp. Ask how that panned out w/ doing the same mods to both motors it'll be close.

Doing the same mods to the L76 and LS3 will still end up w/ the LS3 outperforming it significantly, but choose what you want.

 

The difference between an LT1 and an LS1 are significant.

The difference between an L76 and an LS3 aren't that big.

If you change out the DoD system to a non-DoD system, identical to the cam and valvetrain in the LS3, the only difference is the .2ltr.

The heads are the same. The intake is the same. The throttle body is the same.

Everything else being equal, the difference shouldn't be more than 15 hp or so.

 

I have to disagree, there is a bigger difference between the l76 and the ls3. Both are stout motors tho, friend of mine has an 08 gt and its sweet! Awsome handling, powerslides like a champ!!

1997 lt1 slp ss camaro=310hp
2002 ls1 slp ss camaro=335hp

Difference of 25hp

2009 pontiac g8 gt l76=361hp
2009 pontiac g8 gxp ls3=402hp

Difference of 41 hp

 

I said all else being equal.

The cam and valve train are the major difference.

The stock DoD/AFM cam in the L76 is 200/208, .472"/.476".

The stock LS3 cam is 204/211, .551"/.525".

The heads are the same L92 heads. The intake is the same LS3 intake. The displacement difference is .2ltr, that's it.

Think of the L76 as an LS2 bottom end with an LS3 top end with a tiny cam.

Now, make the cams the same.

Tell me what the difference would be then?

PS
It will cost you around $1200 plus labor to change over the DoD system to a non-DoD system, including cam.

 

Sorry, not worth the difference. Take a GT, add the Livernois DOD delete kit with decent cam and a Maggie for the difference in price. Work over every GXP out there.

 

for those of us who are new to this world but are looking at buying a GT or GXP in the future, can you put up some links to these parts? I agree that to the layman, 50hp doesn't seem to be worth 8-10k. I would much rather put that into performance parts, but honestly want to keep the auto from the GT.

 

Well , to be honest, the MSRP difference is around 6K. A loaded GT is 34K and a GXP is 40K. Yes, GTs can be had for much less. I'll bet in a few months GXPs will be 35-36K, remember, the economy sucks.

You can get the GXP with an auto, the same one that's in the GT.

There is more than just the L76 vs. the LS3.

The GXP gets 4 piston Brembos on the front, the parts to change the GT brakes to GXP will be around $900 (GM parts).

The springs are different at all four corners and the front struts are gas charged in the GXP.

Plus the front and rear fascia are different. The seats are different. The exhaust is deeper and a bit louder.

Check out www.livernoismotorsports.com and www.neweraperformance.com for DoD removal kits and cams for the L76.

PS,
I love my GT.

 

Those of us who want performance would have more like 10k in cash to spend because we wouldn't be buying a fully loaded GT. I've seen them on sale in the 25k range with used ones just under 20k.

 

Yea, I have no idea what performance is.

 

Ok, there is approx 7k diff in MSRP according to KBB.com. You could get the Livernois DOD delete package with the works for $1239 ($2899 installed) and beat every GXP. You could get a little nuts and do the Maggie for $5999 and make them look silly. Of course you would lose the 'I have the biggest wiener because I spent more' contest.

 

I could never dd a car as slow as yours, but to each his own.

 

Most of the V's diffs were replaced Because of "whine" VERY VERYFew actually exploded and it is all caused by massive wheel hop that can be greatly reduced if not totally eliminated.


The v is made for a road course.....Not a dragstrip..... rear diff failure is caused by idiots like tt c6 that think they can make a 2 ton sedan a good 1080 Car for cheap LOL

 

There's a whole lot of talk in this thread, but not too many Gts or GXPs.

 

I have a GXP

 

And thank god your do!!

Now get to throwing on that stockpile of mods you've sat on and prove some points!

CAI and tune GXP dyno'd @ 390, that's non-DOD cam GT territory, going full bolt on GXP will surely be in the 440s-450s, which is Maggie territory, so to all saying you'll just "cam your GT or throw a maggie on it and "work" the GXPs"...uh think again lol. Then hope someones not in your way while racing the GXP cuz it'll stop better

 

All these cars stop well enough. There shouldn't be anyone in the way at the dragstrip. Performance brakes beyond what the GT has are for twisty track drivers. Maggie'd, cam'd GTs are putting down over 500 to the wheels and running 11 flat 1/4s. No GXP with bolt ons could touch that. Also, for those of us at high density altitude, a GXP is a high 13 second car at best. Needs FI to be fast.

 

from what i have been reading the gxp's are going for list or close to it, 38-40k. maybe that will drop, depends on how many they sent over. gt's are going for 26k or so. 12-14K is a ton of mod money.

 

hmm Only 11 Flat G8 I've seen is the 637whp HOB TT G8 pushing some 15psi. Only cammed/Maggie'd G8 I've seen is TuneTime's and on Meth they barely cleared 500 and ran 11.50s.