GM's New Global 2.8L Turbocharged Engine

[n4cer]

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.

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.

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.

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

[bigbenSC]

Awesome sounding engine, the 60 degree V6 DOHC engine family is very good. I'm glad to see that GM is updating its line. Now some American models it should be put into: Malibu SS, G6 GTP, Saturn VUE Redline (ditch the Honda engne), Equinox SS, Torent GTP.

[atc3434]

Yea, 250ft/lbs at 2000rpm out of 2.8 liters is pretty darn strong bottom end. They ought to make a turbo-ed version of the 3.6. VVT is the shizzle.

[Mike3800]

eh... it's ok.

Considering they can get 250hp at 5,300 rpm and 258 lb. ft. at 1,900-4,500 rpm from the Saab 9-5's 2.3L 4cyl, a 2.8L v6 with a turbo wit the same hp and LESS tq... it's not that impressive.

At least it's a step in the right direction. It will be very annoying to hear "GM needs to add a turbo to get that kinda power" type thing.

[GrahamKracka]

or 280 from mitsu's 2.0l and 300 from subaru's 2.4l

[Mike3800]

Originally Posted by GrahamKracka

300 from subaru's 2.4l

2.5

[kubiache]

HP/litre argument = gay.

Hopefully we will see that in a few American cars shortly. God knows GM needs it.

[bigbenSC]

[GrahamKracka]

Originally Posted by Mike3800

2.5

my bad

[GrahamKracka]

Originally Posted by kubiache

HP/litre argument = gay.

...no..its completly valid...but i agree GM does need this...i wonder how the aftermarket will form around it

[bigbenSC]

Originally Posted by GrahamKracka

...no..its completly valid...but i agree GM does need this...i wonder how the aftermarket will form around it

With the way most engines are today, I would expect a small displacement DOHC engine to develop more of an aftermarket/tuner industry than exists for most of GM's mainstream engines. With the execption of the LS1/LS2 V8's. The only problem is that GM probaly won't put these engines in the cars that need them. Putting this in a 40,000 Saab won't bring out the aftermarket like it would to put this in a 27,000 G6 GTP/Malibu SS.

[kubiache]

Originally Posted by GrahamKracka

...no..its completly valid...but i agree GM does need this...i wonder how the aftermarket will form around it

no...it's not.

[Vinaashak]

Hp/L is a reason for people with smaller engines making less power to feel special. Thats all it is and ever will be. It does absolutly nothing for anything.

[Mike3800]

Originally Posted by kubiache

HP/litre argument = gay.

Hopefully we will see that in a few American cars shortly. God knows GM needs it.

100% valid in this case, ESPECIALLY when it comes to TORQUE. I am surprised a 4cyl turbo has more torque and a more borad torqueband than a turbo V6.

No... they can do better. Juice it up or use a smaller lighter weight engine.


At least this is a step in the right direction.

[Vinaashak]

How is Hp/L a valid point. I fail to see it.

[Mike3800]

Originally Posted by Vinaashak

Hp/L is a reason for people with smaller engines making less power to feel special. Thats all it is and ever will be. It does absolutly nothing for anything.

You'd of like the early to mid 1970's then. In 1974 the Ford 7.5 liter V8 had 190HP and 340 Ft.Lbs of torque. The least efficient engines were made in that era. The engines used lots of fuel and produced relativley very little power.

I prefer the musclecar days, where HP per cubic inch was part of the measure of a true musclecar. Just like vehicle weight per HP.

If this was an OHV 2.8 with a turbo, then it's understandable... this is a DOHC 2.8 with a turbo.

The dummy with the G6 says the L67 is a pathetic engine since it "needs" a supercharger to compete. <-- and I DO NOT agree.

This 2.8 has DOHC AND turbo... and only 250Ft.Lbs of torque? How pathetic is that?

[Vinaashak]

Originally Posted by Mike3800

You'd of like the early to mid 1970's then. In 1974 the Ford 7.5 liter V8 had 190HP and 340 Ft.Lbs of torque. The least efficient engines were made in that era. The engines used lots of fuel and produced relativley very little power.

I prefer the musclecar days, where HP per cubic inch was part of the measure of a true musclecar. Just like vehicle weight per HP.

The dummy with the G6 says the L67 is a pathetic engine since it "needs" a supercharger to compete. <-- and I DO NOT agree.

The thing is all things being equal it doesnt matter how much a motor displaces it just matters how much power it produces. Now the HP/LB measurment is very valid. That will make a performance difference

Who is talking bad about the l67?

[Mike3800]

Originally Posted by Vinaashak

The thing is all things being equal it doesnt matter how much a motor displaces it just matters how much power it produces. Now the HP/LB measurment is very valid. That will make a performance difference

Who is talking bad about the l67?

It DOES matter how much TQ and HP and engine produces to a certain point

The L67 has TORQUE!! This 2.8.... COME ON.. you KNOW they can do better.

The guy with the G6 bigbengt67 bad mouths the L36 and L67, claims it's such outdated etc... but he drives a car with an OHV 3500, LESS power and LESS displacment than even the L36

[GrahamKracka]

Originally Posted by kubiache

no...it's not.

In this case it is.....When there are turbo 4 bangers that make 30-50 more HP AND torque...its completly valid....ESPECIALLY SINCE THIS IS GODDAMN dohc V6!!!!

there is nothing really special about this engine..but it is a step in the right direction

[Vinaashak]

Originally Posted by Mike3800

The guy with the G6 bigbengt67 bad mouths the L36 and L67, claims it's such outdated etc... but he drives a car with an OHV 3500, LESS power and LESS displacment than even the L36

No one is perfect.