Review: Pontiac Grand Prix GXP - "Exhilarating but flawed"

**Ming** · 04-02-2005, 11:05 AM

Exhilarating but flawed
Pontiac has stuffed a V-8 into the Grand Prix's engine bay. The result is a rocket-fast takeoff with uneven handling

BRIAN HARPER
CanWest News Service

For the first couple of days, I had a real mystery on my hands. I knew I had just picked up a Pontiac Grand Prix GXP, but I didn't know anything about it.

There was no copy of the Monroney label (which shows the base price of the model, including all standard equipment, options and their retail prices, manufacturer's suggested retail price, etc.) with the keys - standard operating procedure for every GM vehicle I test drive. The Grand Prix sales brochure that was provided contained no information about any GXP model. A cursory visit to GM's media Web site didn't seem to shed any light, either.

Yet, here was this Grand Prix with GXP badges on the sides and, more interestingly, a discreet V-8 badge on the back. Obviously, this was no ordinary Pontiac.

Even before the turn of the key that resulted in a throaty rumble under the hood - a sound distinct to GM's small-block V-8s - there were a few more visual clues that Pontiac had been rummaging through the parts bin to cook up something with a high-performance nature. There are subtle differences to the Grand Prix's long, shark-like body in the form of different front and rear fascias and rocker extensions. A little more overt are the polished 18-inch aluminum wheels and speed-rated Bridgestone Potenzas - vented cross-drilled rotors and red-painted calipers peeking out between the spokes. The ride height seemed a little lower, as well.

Slowly, the details emerged. GM eventually faxed over a price sheet and further digging on the Web site uncovered the story: Following last year's launch of the Bonneville GXP, Pontiac has stuffed a V-8 into the Grand Prix's engine bay (the first in that car since 1987) to create an even higher-performance model that will debut shortly.

I am driving an early-production model. Instead of the Bonny GXP's Northstar-derived DOHC 4.6-litre motor, however, the Grand Prix variant gets a 5300 5.3L OHV V-8, replete with Displacement on Demand (DOD) technology.

The problem was that figuring out the mystery of what the GXP is didn't help me figure out why it is.

GM's performance division already has plenty of four-doors skewed toward performance. Indeed, the existing Grand Prix GTP and its 260 horsepower, supercharged 3.8L V-6 isn't exactly low on the high-output totem.

This was partially explained by Dave Muscaro, GM's assistant chief engineer of small-block V-8s for passenger cars: "There is nothing like the satisfying feel of a V-8 engine, and the 5300 V-8 provides a level of performance rarely available in competitors' vehicles."

In the case of the 5.3L, this means 303 horsepower and in excess of 325 pound-feet of torque or, in walking-the-walk parlance, a zero-to-100-kilometres-an-hour time of about six seconds, according to GM - not shabby for a 1,650-kilogram car.

So, the performance torchbearer for the Grand Prix lineup passes from the $34,160 GTP to the $37,110 GXP.

But the GXP is more than extra horsepower, says Jim Bunnell, Pontiac-GMC general manager.

"It's an extension of Pontiac's total performance lineup. We've taken a systematic approach to elevating all aspects of the Grand Prix's dynamics, ratcheting up everything from handling to styling and refinement, to give performance-oriented customers the exhilarating driving experience they desire."

Unless you're going to dump all over GM for its continued use of overhead valve engines, one can't really fault the GXP's all-aluminum V-8. The automaker says it's the third displacement offering of the Gen IV small-block, which sees duty in the Chevy SSR, GTO and Corvette, as well as several SUVs. It's modified to accommodate the "east-west" mounting position of the Grand Prix's front-wheel drive chassis, necessitating changes to the engine's overall length, including the use of a shorter crankshaft and a single-belt accessory drive system.

In the GXP, the engine pulls strongly from a standing start to get right to required speeds satisfactorily. It's also a happy cruiser, in which case the DOD will supposedly provide up to a 12-per-cent improvement in fuel economy by deactivating half of the engine's cylinders in some light-load conditions.

Unfortunately, a good portion of the V-8's fun quotient is wasted by the four-speed automatic transmission (with TapShift). Simply, the tranny is in urgent need of another gear. Or maybe it's the DOD; but, whatever, more than a nudge of the gas pedal is required to awaken the GXP out of a steady-state slumber for any kind of part-throttle acceleration. Mind you, once you lean on the pedal, the Grand Prix responds with a big rush of speed.

The GXP's handling dynamics are a mixed bag, as well. The good comes in the form of the upgraded brake system. Between the 12.7-inch-diameter discs in front and the 12-inchers in the rear, plus the ABS, the Grand Prix's stopping ability is first-rate. Less so for the ride: Usually, a sedan with a long, 2,807-mm wheelbase such as the Grand Prix's has the length to smooth out tarmac irregularities. But the GXP is fitted with a revamped suspension, including higher rate springs and Bilstein gas-charged struts for more precise damping. Yes, there is less body roll on turns - a rear stabilizer bar helps quell that - but the ride quality suffers. Even mild bumps and potholes are keenly felt in the cabin.

Ultimately, the GXP is an interesting but flawed exercise that is in need of sorting out. Not sure of what it wants to be, it does a lot of things well enough but nothing that jumps out as outstanding. The thing is, I want Pontiac to keep at it. Good-sized four-door sedans from the Big Three with enough sporting cred to keep you interested are in short supply. The Chrysler 300C can't be the only game in town.

Full Review Here: http://www.canada.com/montreal/montr...f-65076d27e0ae

GMfan2381 · 04-02-2005, 12:08 PM

Seems his biggest complaint was the 4-speed... GM really needs the 6 speed auto ASAP. As for the ride, when the car absorbs the blows from the road they complain, when they stiffen it to roll less, they complain. It seems there is no pleasing people with that. All in all its a decent review, I would have liked to have seen a touch more done to the interior. Like some brushed metal accents on the center stack and air vents. But I think Pontiac has the right idea with this. let the Impala/ Lucerne have the smoother ride, the Monte Carlo and Grand Prix are for performance, so they should be stiffer.

Just a bit more of a tweak GM. Say it with me now...6-speed auto... Brushed metal accents...

MelvinJ · 04-02-2005, 01:47 PM

Actually, it just sounds like the kick down programming on the transmission needs to be a little more responsive. Or perhaps the DoD is programmed to respond a little slower to stretch fuel economy a bit. Either way, an engine with the torque curve of the 5.3L in a car like the Grand Prix should be able to responsively move the car with 4 speeds. Maybe there will be some on-going tweaks.

gacSTclass · 04-06-2005, 02:12 PM

The idea is great. But there is only so much GM can do with its W-body and 4-speed transmissions, and it has already shown its age in the 2004 CompG.

It sounds like a hot race car, but the chassis and trans are all wrong. Kinda like trying to build a Subaru WRX with a new engine and looks on a 1989 Subaru platform and 4-speed automatic.

Canuck · 04-06-2005, 05:20 PM

The new GXP is well priced and sounds good. Yes GM needs to offer a manual and a five or six speed manual.
Why can't GM offer the 5 speed auto it sells to BMW?
As far as front wheel drive sports sedan the GXP is a winner.
I noticed GM has improved the Grand Prix this year with cup holders in the back, dual zone HVAC, and new wheels, including the 18 inch wheels on the GXP.
Has anyone checked out the improved back seat? Is it a lot better than the original on early 04 models? I sat in a early 04 model and can't believe it was on production model.

atomicshark · 04-06-2005, 05:31 PM

OK, I know one car is a sedan and one is a coupe, but why spend $37,000 on a FWD 303HP GP GXP when in the same dealership you could pick up a RWD 400HP GTO with better handling for $4000 less?

rm25x · 04-06-2005, 09:38 PM

I would rather spend less and buy the GTO, in 6 speed of course.

jro4566 · 04-06-2005, 10:10 PM

The Grand Prix has always been one of my favorite GM vehicles, and the new GXP version adds to that excitement. OTOH, 303HP through the front wheels is fairly harsh...

Phillip · 04-06-2005, 10:15 PM

Quote:

Originally Posted by RCtennis3811

The Grand Prix has always been one of my favorite GM vehicles, and the new GXP version adds to that excitement. OTOH, 303HP through the front wheels is fairly harsh...

Which is why I wonder what happened to ideas explored with the Grand Prix G8 concept. A well-tuned AWD chassis may have done wonders to set the GXP apart from competitors also flirting with the performance limitations of FWD...

Yes, TL and Maxima...I'm referring to you two.

big swede · 04-06-2005, 10:27 PM

You would think that by using a dated platform with a dirt cheap powertrain that GM would be too embarrassed to put a $37,110 sticker on this car. By jumping the 04' up a couple of grand in price over the 97-03 and seeing an excellent selling car turn into a total bomb you would think they would rethink their pricing strategy.

Whether you like the upcoming Mustang GT 500 or not you cannot doubt that Ford is giving way more content for your money than GM could ever dream of doing. How does Ford put an expensive intercooled DOHC V-8 with a possible Twin Screw supercharger and 6 speed manual or 5 speed automtic in a much newer chassis with a ground up redesign and charge about the same money that GM does for a boring rehashed outdated daily driver.

**Swahili** · 04-06-2005, 10:44 PM

GM needs to drop in a transmission of any number of speeds that can handle the full load of 300hp and 325lb-ft of torque. What's the point of buying a car with a V8 like this GXP if the computer dials back the power to save the tranny? Sure when you absolutely floor it, the car will take off. But figure, Mustang at 300hp does 0-60 in a shade over 5 seconds. GXP with 300hp does 0-60 in 6 seconds. I don't know, it just doesn't make sense to me. Bring the GTO to Canada!

TriShield · 04-06-2005, 10:46 PM

FWD Pontiac poop.

big swede · 04-06-2005, 10:53 PM

Quote:

Originally Posted by Swahili

GM needs to drop in a transmission of any number of speeds that can handle the full load of 300hp and 325lb-ft of torque. What's the point of buying a car with a V8 like this GXP if the computer dials back the power to save the tranny? Sure when you absolutely floor it, the car will take off. But figure, Mustang at 300hp does 0-60 in a shade over 5 seconds. GXP with 300hp does 0-60 in 6 seconds. I don't know, it just doesn't make sense to me. Bring the GTO to Canada!

The GXP does actually have a bunch of strenthening updates so tm won't be as much of an issue as it was last year. The Mustang might be slightly lighter but more importantly has 5 speed transmisions that can use mechanical advantage to create a better performance difference than the hp/tq would suggest.

Again... content for the money is horrible with this car.

**BigAls87Z28** · 04-06-2005, 11:27 PM

Quote:

Originally Posted by Canuck

The new GXP is well priced and sounds good. Yes GM needs to offer a manual and a five or six speed manual.
Why can't GM offer the 5 speed auto it sells to BMW?
As far as front wheel drive sports sedan the GXP is a winner.
I noticed GM has improved the Grand Prix this year with cup holders in the back, dual zone HVAC, and new wheels, including the 18 inch wheels on the GXP.
Has anyone checked out the improved back seat? Is it a lot better than the original on early 04 models? I sat in a early 04 model and can't believe it was on production model.

That 5spd is for RWD, not FWD.

As for the back seat, Jordan (Tahoe) and I sat back there and found no problem.

RWD60 · 04-06-2005, 11:53 PM

Quote:

Originally Posted by Phillip

Which is why I wonder what happened to ideas explored with the Grand Prix G8 concept. A well-tuned AWD chassis may have done wonders to set the GXP apart from competitors also flirting with the performance limitations of FWD...

Yes, TL and Maxima...I'm referring to you two.

GM shoulda gone forward with a performence AWD system for the GP... now they'll just be copiers whatever they do.. the TL will get SH-AWD long before the GP gets an update big enough to affect the drive wheels, and the maxima has the murano platform-mate's AWD system anytime nissan decides to do that (probably by 2007, or at least 2009). when/if they go true RWD, they'll just be following behind the Charger (and likely at a much higher price..), and possibly the CV/GM of ford is serious about refreshing the up to a competitive level.

04-02-2005, 11:05 AM	#1 (permalink)
Ming GMI Staff Member Join Date: Jan 2003 Location: SE Texas Posts: 13,430	Review: Pontiac Grand Prix GXP - "Exhilarating but flawed" Exhilarating but flawed Pontiac has stuffed a V-8 into the Grand Prix's engine bay. The result is a rocket-fast takeoff with uneven handling BRIAN HARPER CanWest News Service For the first couple of days, I had a real mystery on my hands. I knew I had just picked up a Pontiac Grand Prix GXP, but I didn't know anything about it. There was no copy of the Monroney label (which shows the base price of the model, including all standard equipment, options and their retail prices, manufacturer's suggested retail price, etc.) with the keys - standard operating procedure for every GM vehicle I test drive. The Grand Prix sales brochure that was provided contained no information about any GXP model. A cursory visit to GM's media Web site didn't seem to shed any light, either. Yet, here was this Grand Prix with GXP badges on the sides and, more interestingly, a discreet V-8 badge on the back. Obviously, this was no ordinary Pontiac. Even before the turn of the key that resulted in a throaty rumble under the hood - a sound distinct to GM's small-block V-8s - there were a few more visual clues that Pontiac had been rummaging through the parts bin to cook up something with a high-performance nature. There are subtle differences to the Grand Prix's long, shark-like body in the form of different front and rear fascias and rocker extensions. A little more overt are the polished 18-inch aluminum wheels and speed-rated Bridgestone Potenzas - vented cross-drilled rotors and red-painted calipers peeking out between the spokes. The ride height seemed a little lower, as well. Slowly, the details emerged. GM eventually faxed over a price sheet and further digging on the Web site uncovered the story: Following last year's launch of the Bonneville GXP, Pontiac has stuffed a V-8 into the Grand Prix's engine bay (the first in that car since 1987) to create an even higher-performance model that will debut shortly. I am driving an early-production model. Instead of the Bonny GXP's Northstar-derived DOHC 4.6-litre motor, however, the Grand Prix variant gets a 5300 5.3L OHV V-8, replete with Displacement on Demand (DOD) technology. The problem was that figuring out the mystery of what the GXP is didn't help me figure out why it is. GM's performance division already has plenty of four-doors skewed toward performance. Indeed, the existing Grand Prix GTP and its 260 horsepower, supercharged 3.8L V-6 isn't exactly low on the high-output totem. This was partially explained by Dave Muscaro, GM's assistant chief engineer of small-block V-8s for passenger cars: "There is nothing like the satisfying feel of a V-8 engine, and the 5300 V-8 provides a level of performance rarely available in competitors' vehicles." In the case of the 5.3L, this means 303 horsepower and in excess of 325 pound-feet of torque or, in walking-the-walk parlance, a zero-to-100-kilometres-an-hour time of about six seconds, according to GM - not shabby for a 1,650-kilogram car. So, the performance torchbearer for the Grand Prix lineup passes from the $34,160 GTP to the $37,110 GXP. But the GXP is more than extra horsepower, says Jim Bunnell, Pontiac-GMC general manager. "It's an extension of Pontiac's total performance lineup. We've taken a systematic approach to elevating all aspects of the Grand Prix's dynamics, ratcheting up everything from handling to styling and refinement, to give performance-oriented customers the exhilarating driving experience they desire." Unless you're going to dump all over GM for its continued use of overhead valve engines, one can't really fault the GXP's all-aluminum V-8. The automaker says it's the third displacement offering of the Gen IV small-block, which sees duty in the Chevy SSR, GTO and Corvette, as well as several SUVs. It's modified to accommodate the "east-west" mounting position of the Grand Prix's front-wheel drive chassis, necessitating changes to the engine's overall length, including the use of a shorter crankshaft and a single-belt accessory drive system. In the GXP, the engine pulls strongly from a standing start to get right to required speeds satisfactorily. It's also a happy cruiser, in which case the DOD will supposedly provide up to a 12-per-cent improvement in fuel economy by deactivating half of the engine's cylinders in some light-load conditions. Unfortunately, a good portion of the V-8's fun quotient is wasted by the four-speed automatic transmission (with TapShift). Simply, the tranny is in urgent need of another gear. Or maybe it's the DOD; but, whatever, more than a nudge of the gas pedal is required to awaken the GXP out of a steady-state slumber for any kind of part-throttle acceleration. Mind you, once you lean on the pedal, the Grand Prix responds with a big rush of speed. The GXP's handling dynamics are a mixed bag, as well. The good comes in the form of the upgraded brake system. Between the 12.7-inch-diameter discs in front and the 12-inchers in the rear, plus the ABS, the Grand Prix's stopping ability is first-rate. Less so for the ride: Usually, a sedan with a long, 2,807-mm wheelbase such as the Grand Prix's has the length to smooth out tarmac irregularities. But the GXP is fitted with a revamped suspension, including higher rate springs and Bilstein gas-charged struts for more precise damping. Yes, there is less body roll on turns - a rear stabilizer bar helps quell that - but the ride quality suffers. Even mild bumps and potholes are keenly felt in the cabin. Ultimately, the GXP is an interesting but flawed exercise that is in need of sorting out. Not sure of what it wants to be, it does a lot of things well enough but nothing that jumps out as outstanding. The thing is, I want Pontiac to keep at it. Good-sized four-door sedans from the Big Three with enough sporting cred to keep you interested are in short supply. The Chrysler 300C can't be the only game in town. Full Review Here: http://www.canada.com/montreal/montr...f-65076d27e0ae Last edited by Ming : 04-02-2005 at 11:11 AM.

04-02-2005, 12:08 PM	#2 (permalink)
GMfan2381 5.3 Liter Vortec V8 Join Date: Sep 2004 Location: Bel-Air, MD Drives: 2001 Cavalier Z24 Posts: 1,368	Re: Review: Pontiac Grand Prix GXP - "Exhilarating but flawed" Seems his biggest complaint was the 4-speed... GM really needs the 6 speed auto ASAP. As for the ride, when the car absorbs the blows from the road they complain, when they stiffen it to roll less, they complain. It seems there is no pleasing people with that. All in all its a decent review, I would have liked to have seen a touch more done to the interior. Like some brushed metal accents on the center stack and air vents. But I think Pontiac has the right idea with this. let the Impala/ Lucerne have the smoother ride, the Monte Carlo and Grand Prix are for performance, so they should be stiffer. Just a bit more of a tweak GM. Say it with me now...6-speed auto... Brushed metal accents... __________________ GM autos: the best investments I've ever made ------------------------------------------------------- 1986 chevy cavalier wagon-206,442 miles 1989 oldsmobile cutlass-216,220 miles 2000 chevy cavalier-52,367 miles --totalled 2001 chevy cavalierZ24-80,654 (Something finally happened! Needed a new battery) So lets see. Toyota lied about recalls. Lied about their HP ratings... I wonder how much truth is in their milage ratings..

04-02-2005, 01:47 PM	#3 (permalink)
MelvinJ 5.3 Liter LS4 V8 Join Date: Nov 2003 Posts: 3,651	Re: Review: Pontiac Grand Prix GXP - "Exhilarating but flawed" Actually, it just sounds like the kick down programming on the transmission needs to be a little more responsive. Or perhaps the DoD is programmed to respond a little slower to stretch fuel economy a bit. Either way, an engine with the torque curve of the 5.3L in a car like the Grand Prix should be able to responsively move the car with 4 speeds. Maybe there will be some on-going tweaks.

04-06-2005, 02:12 PM	#4 (permalink)
gacSTclass 3.8 Liter Supercharged V6 Join Date: Apr 2005 Posts: 612	Re: Review: Pontiac Grand Prix GXP - "Exhilarating but flawed" The idea is great. But there is only so much GM can do with its W-body and 4-speed transmissions, and it has already shown its age in the 2004 CompG. It sounds like a hot race car, but the chassis and trans are all wrong. Kinda like trying to build a Subaru WRX with a new engine and looks on a 1989 Subaru platform and 4-speed automatic.

04-06-2005, 05:20 PM	#5 (permalink)
Canuck 6.0 Liter Vortec V8 Join Date: May 2003 Location: Vancouver Drives: 2005 CTS 3.6, 2005 Envoy Posts: 1,959	Re: Review: Pontiac Grand Prix GXP - "Exhilarating but flawed" The new GXP is well priced and sounds good. Yes GM needs to offer a manual and a five or six speed manual. Why can't GM offer the 5 speed auto it sells to BMW? As far as front wheel drive sports sedan the GXP is a winner. I noticed GM has improved the Grand Prix this year with cup holders in the back, dual zone HVAC, and new wheels, including the 18 inch wheels on the GXP. Has anyone checked out the improved back seat? Is it a lot better than the original on early 04 models? I sat in a early 04 model and can't believe it was on production model.

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04-06-2005, 05:31 PM	#6 (permalink)
atomicshark 6.0 Liter LS2 V8 Join Date: Dec 2003 Location: Long Island, New York Posts: 4,429	Re: Review: Pontiac Grand Prix GXP - "Exhilarating but flawed" OK, I know one car is a sedan and one is a coupe, but why spend $37,000 on a FWD 303HP GP GXP when in the same dealership you could pick up a RWD 400HP GTO with better handling for $4000 less?

04-06-2005, 09:38 PM	#7 (permalink)
rm25x Walking Join Date: Mar 2005 Location: Grand Blanc, MI. Drives: '05 Cobalt Coupe 5 Speed Posts: 6	Re: Review: Pontiac Grand Prix GXP - "Exhilarating but flawed" I would rather spend less and buy the GTO, in 6 speed of course. __________________ '05 Cobalt Coupe -Ultra Silver 5 Speed

04-06-2005, 10:10 PM	#8 (permalink)
jro4566 7.0 Liter LS7 V8 Join Date: Dec 2003 Location: Dallas, Texas Drives: 2001 Oldsmobile Silhouette 2003 Suzuki XL-7 2005 Posts: 5,050	Re: Review: Pontiac Grand Prix GXP - "Exhilarating but flawed" The Grand Prix has always been one of my favorite GM vehicles, and the new GXP version adds to that excitement. OTOH, 303HP through the front wheels is fairly harsh... __________________ 2007 BMW 328i. Black sapphire metallic. Terra leather. Poplar wood. Automatic trans. Xenon adaptive headlights. BMW Assist. Bluetooth. Premium package. Heated seats. iDrive navigation system. Rear sonar. Comfort access. LOGIC7 surround sound. Sirius. 18" BMW wheels. Rear spoiler. 2006 Suzuki Grand Vitara Luxury. Black onyx pearl. Beige leather. 4WD. Chrome hood vents, mirror covers, exhaust. Silver grille, taillight trim. Brushed metal bumper protector. Running boards.

04-06-2005, 10:27 PM	#10 (permalink)
big swede 6.0 Liter LS2 V8 Join Date: Sep 2003 Location: Midwest Drives: 07' Monte Carlo SS Posts: 4,128	Re: Review: Pontiac Grand Prix GXP - "Exhilarating but flawed" You would think that by using a dated platform with a dirt cheap powertrain that GM would be too embarrassed to put a $37,110 sticker on this car. By jumping the 04' up a couple of grand in price over the 97-03 and seeing an excellent selling car turn into a total bomb you would think they would rethink their pricing strategy. Whether you like the upcoming Mustang GT 500 or not you cannot doubt that Ford is giving way more content for your money than GM could ever dream of doing. How does Ford put an expensive intercooled DOHC V-8 with a possible Twin Screw supercharger and 6 speed manual or 5 speed automtic in a much newer chassis with a ground up redesign and charge about the same money that GM does for a boring rehashed outdated daily driver. __________________ 07' SS Monte

04-06-2005, 10:44 PM	#11 (permalink)
Swahili GMI Staff Member Join Date: Jan 2003 Location: Ontario, Canada Drives: 2000 Chev Monte Carlo SS Posts: 5,170	Re: Review: Pontiac Grand Prix GXP - "Exhilarating but flawed" GM needs to drop in a transmission of any number of speeds that can handle the full load of 300hp and 325lb-ft of torque. What's the point of buying a car with a V8 like this GXP if the computer dials back the power to save the tranny? Sure when you absolutely floor it, the car will take off. But figure, Mustang at 300hp does 0-60 in a shade over 5 seconds. GXP with 300hp does 0-60 in 6 seconds. I don't know, it just doesn't make sense to me. Bring the GTO to Canada! __________________ 2000 Chevy Monte Carlo SS. Black, 3800 Series II V6, 4 speed automatic - 138,900km. The Official GMI 2007-2008 NHL Season

04-06-2005, 10:46 PM	#12 (permalink)
TriShield 6.2 Liter Vortec V8 Join Date: Jan 2005 Location: Phoenix, AZ, USA Drives: LS2 Pontiac GTO, L76 Pontiac G8 Posts: 2,572	Re: Review: Pontiac Grand Prix GXP - "Exhilarating but flawed" FWD Pontiac poop. __________________ AUTOEXTREMIST - DAN NEIL - GENERAL WATCH - JEREMY CLARKSON - THE TRUTH ABOUT CARS - TOP GEAR 2006 LS2 Pontiac GTO - 2008 L76 Pontiac G8

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