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GM's new 2.8L Turbo info
Tuesday, February 15, 2005 5:47 PM
Press info

General Motors expands the family of advanced global V-6 engines with the sophisticated 2.8L V-6 Turbo - a transverse-mounted compact and lightweight powerhouse that delivers the performance of a larger-displacement engine.

The 2.8L V-6 Turbo debuts in the Aero models of the all-new Saab 9-3 SportCombi, Sport Sedan and Convertible, continuing the brand's heritage of turbo power established in 1977. It is the most sophisticated turbocharged engine ever offered in a Saab vehicle, delivering excellent responsiveness through low-speed torque and high-rpm power, as well as exceptional refinement.

Technology such as a twin-scroll turbocharger and variable intake valve timing helps the 2.8L V-6 Turbo achieve 250 horsepower (184 kw) and 258 lb.-ft. of torque (350 Nm) in the 9-3.

"The 2.8L V-6 Turbo has a strong, linear feel that gives the impression of a larger-displacement engine," said Tim Cyrus, global V-6 chief engineer. "The feeling of power is tremendous, but so is the smoothness and refinement built into the engine."

Developed in conjunction with other engines in the global V-6 family, turbocharging was designed into the architecture's structural parameters. The powertrain engineers' experience with turbocharging at Saab was integral in refining the engines' performance, with the 2.8L V-6 Turbo delivering maximum torque by 2000 rpm and maintaining it through 4,500 rpm. Ninety percent of peak torque is available from just 1500 rpm. This broad performance spectrum results in an engine that effectively offers two torque curves: a linear curve that delivers exceptional low- and mid-range torque, and higher-rpm power that benefits from the pressure of the turbocharger.

"It's almost like having two engines on tap," said Cyrus. "At low speeds, the inherent torque of the V-6 pulls strongly, but it has the power of a larger-displacement engine when the full power of the turbo system is called up."

Inside the engine

All engines in the global V-6 family share traits that include a lightweight aluminum cylinder block with iron cylinder sleeves, an aluminum structural oil pan and aluminum cylinder heads with four valves per cylinder. The 2.8L V-6 Turbo builds on those strengths with components and technology developed specifically for the turbo system, including:

Twin-scroll turbocharger delivering approximately 9 pounds of boost (0.6 bar)
Integrated charge cooling
Unique cylinder heads made from 356T-6 aluminum and featuring sodium-filled exhaust valves
Forged steel crankshaft and sinter-forged connecting rods strengthened for turbocharged loads
Pistons with anodized ring grooves designed for turbocharger boost pressure
9.5:1 compression ratio
Piston oil cooling jets
Unique camshaft profiles designed for turbocharger performance
Hydroformed "dual skin" exhaust manifolds with stainless steel inner liners
Engine-mounted oil cooler
The turbo system features a unique, twin-scroll turbocharger. It has an integral bypass valve and is fed by two exhaust ducts - one from each cylinder bank. Separating the exhaust gas pulses with two compressor zones improves gas flow and reduces energy loss. The turbo system's charge cooler promotes performance by reducing the temperature of inlet air.

Additionally, the 2.8L V-6 Turbo employs a conventional, single-stage intake manifold and variable valve timing on the intake camshaft - the variable valve timing helps optimize performance and emissions control. Also, a variable fuel pressure system helps ensure smooth idle and driving characteristics. Valve timing and fuel pressure are managed by the engine's powerful controller, a 32-bit micro-hybrid system which is calibrated specifically for the turbocharged application.

The sophisticated controller operates under a torque-based engine management strategy designed to deliver smooth performance in all driving conditions. The system works with the vehicle's transmission to modulate torque, providing stirring performance and excellent engine response. The system also can limit torque in low-traction conditions, helping provide confident, sure-footed driving.

Cross-globe connection

The 2.8L V-6 turbo is the third variant of the new global V-6 family - a technologically advanced 60-degree, dual overhead-cam architecture designed to produce strong power and excellent fuel economy to meet different needs in markets around the world. Engineers from GM Powertrain in North America and FGP - the Europe-based Fiat-General Motors Powertrain consortium - as well as Holden collaborated on the development.

The global V-6 engine family also includes a 2.8L V-6 VVT normally aspirated version which debuted in the 2005 Cadillac CTS, as well as a 3.6L V-6 VVT version that also is available in the CTS. The 3.6L V-6 VVT also is available in the 2005 Cadillac STS and SRX, as well as the Buick Rendezvous and LaCrosse. It is available under the Alloytec brand name in the 2005 Holden Commodore, Calais, Berlina short wheelbase, Statesman and Caprice long wheelbase, Ute, Cab Chassis and Crewman. All use variable valve timing for optimal performance and emissions control.

The 2.8L V-6 Turbo is built at Holden's Port Melbourne, Australia facility, along with 3.6L variants of the global V-6.



2.8L V-6 Turbo Specifications

Assembly site:
Port Melbourne, Australia

Applications:
Saab 9-3 SportCombi, Sport Sedan and Convertible

Type:
2.8L DOHC turbocharged V-6

Displacement (cu in/ cc):
170 / 2792

Bore x stroke (in x mm):
3.50 x 2.94 / 89 x 74.8

Block material:
aluminum

Cylinder head material:
356T-6 aluminum

Intake manifold:
cast aluminum

Exhaust manifolds:
hydroformed "dual skin" w/ stainless steel liners

Compression ratio:
9.5:1

Valve configuration:
overhead cam; four valves per cylinder

Valve lifters:
hydraulic lash adjuster, roller finger follower

Firing order:
1 - 2 - 3 - 4 - 5 - 6

Fuel system:
sequential fuel injection

Horsepower (hp / kw):
250 / 184 @ 5500 rpm (est)

Torque (lb-ft / Nm):
258 / 350 @ 2000 - 4500 rpm (est)

Fuel shut off:
6500 rpm

Crankshaft:
forged steel

Connecting rods:
sinter-forged metal

Additional features:
electronic throttle control, variable intake valve timing, variable fuel pressure, pressure-actuated piston cooling jets, extended-life spark plugs, extended-life coolant, GM Oil Life System, oil level sensor, extended-life accessory drive belt





>>>For Sale? Clicky!<<<
-----The orginal Mr.Goodwrench on the JBO since 11/99-----


Re: GM's new 2.8L Turbo info
Tuesday, February 15, 2005 7:03 PM
not too exciting. There are plenty of vehicles out there that are N/A without the turbo that are pushing more horsepower than that. Just another place where GM falls behind. Great news ten years ago, General Motors!




Re: GM's new 2.8L Turbo info
Tuesday, February 15, 2005 7:33 PM
A 9-3 with 250hp isn't that bad. Current 9-3 sport sedans have 210 hp on the 2.0 ecotec. At least its made in Australia instead of Mexico or something.



Re: GM's new 2.8L Turbo info
Tuesday, February 15, 2005 9:07 PM
258ft lbs at 2k rpm is very inpressive. and at only 9 psi.
Re: GM's new 2.8L Turbo info
Tuesday, February 15, 2005 9:53 PM
you could more than likely easily crank the boost on those and get much better numbers



Re: GM's new 2.8L Turbo info
Tuesday, February 15, 2005 10:09 PM
This is just the low boost version of the engine. The Cadillac BLS is getting a 275hp version of this very same engine. Isn't the 9-5 getting a 280hp variant? Or have I heard incorrect information.


"Fiery words fuel debate and debate yields understanding"
Re: GM's new 2.8L Turbo info
Tuesday, February 15, 2005 10:23 PM
Not impressed.


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Re: GM's new 2.8L Turbo info
Tuesday, February 15, 2005 10:42 PM
<~~ slightly impressed. Everyone thinks thats crap, but Gm has shown lately to under-rate their engines. Plus at only 9psi, there is definately more potential. Plus its a transversely mounted 60* v6.. I see a little potential there. Or maybe even a cool new swap someday....






Re: GM's new 2.8L Turbo info
Wednesday, February 16, 2005 5:58 AM
pshhh....

tell you a secret: subaru has a 4 banger 2.5 l with 300 hp...

welcome to last decade GM


<img src="http://www.j-body.org/registry/castlevanity/xs-kosmos.gif"> <img src="http://www.j-body.org/registry/castlevanity/x_avatar_03.jpg">
Re: GM's new 2.8L Turbo info
Wednesday, February 16, 2005 7:55 AM
Not bad. Esp. like having 90+% of torque available from 1500-4500rpm. I'd like to see what the little beast could do with the boost turned up though. If nothing else it would make a nice Solstice/Sky engine upgrade.







Re: GM's new 2.8L Turbo info
Wednesday, February 16, 2005 8:30 AM
ChevySunfireGT wrote:pshhh....

tell you a secret: subaru has a 4 banger 2.5 l with 300 hp...

welcome to last decade GM


your an idiot. only .3L more, only 9 psi, and its NEW not an engine that they've had time to find tune and improve like the boxer engine.




2006 Cobalt SS 2.4L 9.6 @74mph 1/8th mile w/2.28 60ft



Re: GM's new 2.8L Turbo info
Wednesday, February 16, 2005 10:29 AM
You guys do realize that same output is being put out on Saab's 9-5 Aero 2.3L I-4. Now it needs a larger displacement and 6-cylinders to do the same output.

In some cases this has been GM's latest trend, put out at or less power then what they had in the past?
Well atleast this V6 is 60degree in design. On a V angle 6cylinder thats the natural design, so it will be smooth.
Lets see if they can up the ante, I belive this engine capable of upto 275HP. But I would not mind having this engine.




>>>For Sale? Clicky!<<<
-----The orginal Mr.Goodwrench on the JBO since 11/99-----

Re: GM's new 2.8L Turbo info
Wednesday, February 16, 2005 1:01 PM
OK,

First I congratulate GM for considering an Turbo Engine for domestic release.

But, the engine is not impressive at all. Its just a basic commuter turbo engine, thats it. Variable Valve timing, and twin scroll turbo's have been available Toyota's Nissan's and Subaru's since the mid 90's.

Hopefully it will make a debut in the US and have some tuning capability. But impressive, it is not.





2004 WR Blue/silver STi
Re: GM's new 2.8L Turbo info
Thursday, February 17, 2005 7:12 PM
Actually, the ONLY thing that turns me off is the 9.5:1 compression.

There goes like 10PSI more you could have gotten away with at the same knock index.

The piston oils squirters, Forged crank, (the wtf something forged rods) are all great....

GM needs to start making real turbo motors, they are SO afraid of it.

I've actually made a Turbo kit for a 98 GP GTP.
http://www.photobucket.com

album name "mattsgtp1"
He is a client of mine, these are some pics of the raw kit, with no Intercooler, on a partially stock exhaust.

The kit includes.
Full tubular front and rear manifolds (so far Im the ONLY vendor that offers this) T62 Turbo with .81 A/R, full 3 inch downpipe..
the GTP was meant to be boosted, I just changed out the hair dryer :]
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