MT goes 0-60 in 6sec and 1/4mile in 14.3 @ 98.1....

On the 5.3 GXP. Got it off ClubGP.

WOW ! Maybe GM did lax up a lil on the PCM babaysitters . Considering how much a dissapointment 04-05 GTP performance was , thats ALOT better than I woulda guessed out da box . Seeing that , Im sure one the GP guys will nab a 13 sec Et stock . Nice :)

Can't wait for the Impala SS vs Charger R/T comparo.

i was hoping for a 14.0 or 14.1, i managed to run my moms 04 GTP to 14.6 at 96 with a 2.35 60ft.

Yeh if the mags are doing 6.0/14.3 there will definitely be owners goings into the 13's at the track.

Finally, they are in Honda accord v6 territory.

My '97 L67 Bonneybeater SE goes 14.5s at 97.xx with only a 3.5" pulley and a 9" K&N open cone. If I put the K&N in a proper cold air box and had a 3.4" pulley, I'm guessin' it would be a dead heat.

Best regardSS,

Elie

woohoo, who cares

Well, atleast its not slow. :tired:

Fantastic times. :)

But it's going to be a bit of a downer to to do it yourselfers. You'll no longer be able to get massive performance gains by simply buy buying a $20 pulley. :(

Will you even be able to safely make power gains..?? From what I've read its programmed to hold the hp down since the trans cant take it. Which would be a bummer :(

Fantastic times. :)

But it's going to be a bit of a downer to to do it yourselfers. You'll no longer be able to get massive performance gains by simply buy buying a $20 pulley. :(

Its still kintergarden easy to get massive reliable gains with the LS engines though . Alot of people did that $20 pulley and didnt do the mods that cooralated with the higer boost levels and hurt the engine . How appealing is just that pulley swap now . ;)

Will you even be able to safely make power gains..?? From what I've read its programmed to hold the hp down since the trans cant take it. Which would be a bummer :(

The Grand Prix's aftermarket is huge and the GXP will fall right into the GTP aftermarket . Intense , SLP or ZZp Im sure will have the pcm babysitters programmed out and avail for purchase stat :) And upgraded transmissions and higher stall torque converters wont be far behind .

Be a lot easier to get excited (genuinely excited) if the car drove the correct set of wheels.

Sorry - will get off that theme for now...that horse is now beyond dead.

Am I the only one a little disappointed here? For an engine with as much peak HP as the LS1, in a car weighing about the same as an f-body, it's a good 1/2 second slower. I know, it's a FWD sedan but still, you'd think 300 HP would net you better than a 14.3 :think:

Am I the only one a little disappointed here? For an engine with as much peak HP as the LS1, in a car weighing about the same as an f-body, it's a good 1/2 second slower. I know, it's a FWD sedan but still, you'd think 300 HP would net you better than a 14.3 :think:

If youve ever driven a car with Torque management , you understand why . Add TM to the degree the GP has to the 305 hp F-bodys and they wouldnt have been nearly as fast .

FWIW - a 97-03 GTP coulda ran 14.1-4@97-98 with nothing more than the TM programmed out . That Ive seen in person with a real 98 GTP .

how's it have as much peak hp as an ls1?
we do know the ls1 is actually 350 right?

Fantastic times. :)

But it's going to be a bit of a downer to to do it yourselfers. You'll no longer be able to get massive performance gains by simply buy buying a $20 pulley. :(
I have a S/C 3800 and love it, but I would take an LS4 in a second. This car will be ultimately far easier to mod. The pulley swaps are appealing, but then don't forget that you're probably going to have to do supporting mods in order to combat KR. Also, if the trans really is stronger in this thing, that will be a major bonus.
And of course, no amount of mods to the 3800 will produce that smallblock growl ;) .

how's it have as much peak hp as an ls1?
we do know the ls1 is actually 350 right?
I know that many people believe the f-body LS1s produce about that much, but I don't recall seeing any official engine dyno numbers to back it up. I don't tend to put much faith in questionably calibrated chassis dynos and equally suspect conversion factors. Yes, it's probably a little bit more than the claimed 305, but I doubt it's 350.

Anyhow, I'm fully aware of the TM issue. But that doesn't alleviate my disappointment at a 300 HP V8 not dipping into the 13s.

look at the ls1 section i say, many claim (and some prove which is always the deciding factor) that they can put 300+ on a dyno
to each their own

If youve ever driven a car with Torque management , you understand why . Add TM to the degree the GP has to the 305 hp F-bodys and they wouldnt have been nearly as fast .

FWIW - a 97-03 GTP coulda ran 14.1-4@97-98 with nothing more than the TM programmed out . That Ive seen in person with a real 98 GTP .

I've spoken to people who would know...and been told that these cars would be heavily torque managed. However, RLSedition at ClubGP (who helped develop the GXP package) says the LS4 has ZERO TM......powertrain simply beefed up the transaxle to hold the V8's torque.

We'll know for sure, pretty soon.

I've spoken to people who would know...and been told that these cars would be heavily torque managed. However, RLSedition at ClubGP (who helped develop the GXP package) says the LS4 has ZERO TM......powertrain simply beefed up the transaxle to hold the V8's torque.

We'll know for sure, pretty soon.


I am not sure I buy that. They struggled to get the same trans to stay togethore in the Comp G and heavily TQ managed it...yet a year later they add 43 HP with no TQ managment? It's also not like this is a new transmission...it has been the same glass jaw for the W-cars since the old Lumina Z-34.

As for the V8...the power is nice, but a blown 3800 can easily matched it. One thing that concerns me, is it seems like the engine is jamed in there so tight it may be very hard to work on.

I've spoken to people who would know...and been told that these cars would be heavily torque managed. However, RLSedition at ClubGP (who helped develop the GXP package) says the LS4 has ZERO TM......powertrain simply beefed up the transaxle to hold the V8's torque.

We'll know for sure, pretty soon.

I just have to call BS on that. The numbers just dont add up.

But like you said, we'll see.

Here's the trans thread

http://www.clubgp.com/newforum/tm.asp?m=2189688&p=1&tmode=1&smode=1

I am not sure I buy that. They struggled to get the same trans to stay togethore in the Comp G and heavily TQ managed it...yet a year later they add 43 HP with no TQ managment? It's also not like this is a new transmission...it has been the same glass jaw for the W-cars since the old Lumina Z-34.

As for the V8...the power is nice, but a blown 3800 can easily matched it. One thing that concerns me, is it seems like the engine is jamed in there so tight it may be very hard to work on.
This car is a whole lot more comprehensive a package than the Comp G was. It seems all they did for the powertrain on the GTP was up the power and then take it away with torque management. Basically they treid to create a car that looked better on paper for little/no investment.
This definitely had some money in it. I still don't think the tranny is something to write home about, but I don't think they just plopped that new engine in and used TM.
BTW, will this be getting a 6-speed auto in the coming yrs?

This car is a whole lot more comprehensive a package than the Comp G was. It seems all they did for the powertrain on the GTP was up the power and then take it away with torque management. Basically they treid to create a car that looked better on paper for little/no investment.
This definitely had some money in it. I still don't think the tranny is something to write home about, but I don't think they just plopped that new engine in and used TM.
BTW, will this be getting a 6-speed auto in the coming yrs?


The Comp G and GTP had the same TQ managment. What set the Comp G out was a 3.27 final drive ratio, the transmission was called the HD version, it got Magnasteer II, CrapShift, and Stbilitrack Sport.

When it came out, GM was touting the Comp G as the best handling FWD car in the world.

Asside from the engine, brakes, and wider front tires, what does the GXP have that is new performance wise?

Here's the trans thread

http://www.clubgp.com/newforum/tm.asp?m=2189688&p=1&tmode=1&smode=1


Odd...
Lutz wanted the 04 to have 300HP, and the 3800 had that and then some ready to go. They were even testing it at that power level and had to dial back the power at the last minute because they could'nt stop grenading the 4T65. Matter of fact, the original release had the Grand Prix at 265 HP, and they even had to pull 5 HP from that before the car was produced.

Seeing that 04's have trans issues in the 290HP+ range with TQ managment...I would really love to know what GM cooked up in a year and half that added the durability to take a V8 with no TQ managment.

Who knows , as fast as even common family sedans , let alone sports type sedans are getting ....and the knowledge that a 300 hp Grand Prix had better not get waxed by a 260hp Nissan Altima , maybe they finally found it feasible or mandatory to open the cash cow for engineering. Its not like there is no way to make a 4t65e take ALOT of power . The aftermarket has more than proven that . It has to be purely a cost issue . Itd be pretty hard sell to me anyways , that the people who designed the trans have just fumbled for years trying to figure out how to make it stronger , when the aftermarket has produced a 4t65e that will take power levels exceeding 500 hp .

So yeah , within a year and 1/2 , IMO priorities coulda changed and engineering was given the budget to produce a better trans . How could it have been done so qwicky , engineering already knew in the 1st place what shoulda been done from the beginning and now they have the $$$$ in the budget to do it .

The old GTP and it trans are common old GM think . Hey GTPs sell well , why invest more to make it perfect . Its good enuff how it is .

Will the GTP still be sold when the GXP comes out or is the GXP replacing it ? Itd be interesting to see this trans was carried to the GTP as well and TM went bye bye for good .

Asside from the engine, brakes, and wider front tires, what does the GXP have that is new performance wise?
The Bilstein struts. All in all, this is a big boost over the Comp G IMO.

All in all, I would still rather have a V8 making the 300hp than a 300hp 3800 SC (although I wouldn't mind making my own GTP a 300hp L67 ;)). A V8 is just going to be better than the old V6. It weighs less and probably gets better fuel economy than a 3800 would at that hp. Also, while the cheap pulley swap is a great modding advantage for low budget performance, the smallblock LS4 will certainly have more than its fair share of mods, and will be able to go much higher than the L67. Also, as I said before in response to Guy, the waah of a S/C, while cool in its own right, just doesn't compare to the VROOM of a GM small block.

If this gets a 6-speed auto in the near future, it will be a killer car. As it is, the GXP (with rebates) is a V8 car playing in the V6 sedan sandbox.

It wasn't like they came up with the V8 idea just this past year, GM has had W-Body V8 mules running around for years. Back in 2000 when the Impala and Monte Carlo were new body styles they had mules with LS1s in them running around. One Impala from 2001 actually had special SS trim, looked like it was ready for production then it got axed (probably because of trans. problems) I believe they still have some pics. of it over at www.9C1.com

Right before Oldsmobile got axed the Intrigue was going to get the Aurora's version of the Northstar V8 as a option, I believe there was a show car Intrigue 4 or 5 years ago that featured the V8. I think that would have been a sweet pkg.

Just flipped through the MT for the GP GXP test and I was shocked at how bad the front looked. What happened to the hot looking GXP that pics. were posted here about 6 months ago, it looked more like the treatment Bonneville GXP got. When did this new front change happen. This is horrible.