Saturn Sky Forum banner

1 - 20 of 66 Posts

·
Registered
Joined
·
623 Posts
Discussion Starter #1
Solstice GXP

LOS ANGELES – Pontiac ’s product resurgence zooms forward with the introduction of the 2007 Solstice GXP, the performance version of its in-demand Solstice roadster, at the Greater Los Angeles Auto Show.
“The Solstice GXP pushes the production Solstice to the next level with a 47-percent boost in horsepower, and demonstrates how GM is working on all fronts to build and sell exciting products for diverse audiences,” said Mark LaNeve, General Motors North America vice president of Vehicle Sales, Service and Marketing.

Solstice GXP features GM’s all-new Ecotec 2.0-liter turbo, the most powerful production engine in the Ecotec family.* This turbo with direct injection kicks a V-6’s worth of power out of a four-cylinder engine, an estimated 260 horsepower (194 kw) and 260 lb.-ft. (353 Nm) of torque.*

The performance roadster will feature GM’s StabiliTrak four-channel electronic stability control system. It will debut in the summer and is expected to be priced about $4,000 to $5,000 above the base Solstice.

Solstice GXP will be on display with the Solstice, which features a powerful Ecotec 2.4L engine rated at 177 horsepower (132 kw) and is matched to a close-ratio five-speed manual transmission. The driver-oriented cockpit interior features motorcycle-inspired instruments.

----------------------------------------------------------------

Turbo ECOTEC

PONTIAC , Mich. – General Motors introduces the Ecotec 2.0-liter Turbo engine in the 2007 Pontiac Solstice GXP, making it GM’s first direct injection offering in North America . Gasoline direct injection technology helps the Ecotec engine produce more power while maintaining the lower fuel consumption of a small displacement port-injected engine. It produces 260 horsepower (194 kW) and 260 lb.-ft. of torque (353 Nm),* making it GM’s highest specific output engine ever, at 2.1 horsepower per cubic inch of displacement (130 hp / 97 kW per liter), and the most powerful production engine in the Ecotec family.

Variable valve timing and an intercooled, twin-scroll turbocharging system are used to optimize the Ecotec 2.0-liter Turbo engine’s performance. It was developed with the global resources of GM Powertrain in the United States and Europe , drawing on expertise from the naturally aspirated Ecotec 2.2-liter direct injection engine used in some European applications and the 2.0-liter turbocharged engines already in production.

With direct injection, fuel is delivered directly to the combustion chamber to create a more complete burn of the air/fuel mixture. Less fuel is required to produce the equivalent horsepower, especially at normal cruising speeds, of a conventional port-injection combustion system.

“Direct injection technology works well with turbocharging and helps deliver a great balance of power and economy,” said Ed Groff, assistant chief engineer, Ecotec 2.0-liter Turbo engine. “The Ecotec 2.0-liter Turbo produces the power expected of a V-6, but in a smaller, more efficient package – and the driving response is simply terrific.”

A dual-scroll turbocharger with a lightweight turbine provides nearly instant power and an air-to-air intercooling system bolsters the turbo’s performance by reducing inlet temperatures. Dual cam phasing complements the turbocharging system by optimizing valve timing at lower rpm for best turbo response and quick engine torque build-up time.

The Ecotec 2.0-liter Turbo uses a stronger, “Gen II” Ecotec engine block, which was developed with input from racing experience to support increased horsepower and torque. The cylinder block bulkheads – the areas where the main bearing caps are attached – and the bore walls are enlarged for strength. Other areas of the engine were enhanced to reinforce the structure and the water jacket is deeper for added cooling capacity and improved cylinder bore roundness. This architecture is shared with the 2.4-liter Ecotec engine that debuted in the Pontiac Solstice roadster.

Highlights of the Ecotec 2.0-liter Turbo engine include:
  • Steel crankshaft
  • Forged connecting rods
  • Forged oil-galley pistons
  • Jet-spray piston cooling
  • 9.2:1 compression ratio
  • Aluminum cylinder head with sodium-filled exhaust valves
  • High-pressure engine-driven fuel pump
  • Variable pressure fuel rail
  • Dual-scroll turbocharger
Components including the steel crankshaft, forged connecting rods and forged pistons are high-strength items that provide strength and enhance durability. Jet-spray oil cooling directed toward an oil-galley piston help reduce piston temperatures. The system delivers pressurized oil to continuously lubricate and cool the pistons, which reduces friction and noise and ensures durability for the engine’s higher power levels. To enhance combustion, the piston tops feature a dish shape that deflects injected fuel toward the spark plugs.

To accommodate the direct injection system, the Ecotec 2.0-liter Turbo has a unique cylinder head and intake manifold. The cylinder head incorporates mounting locations for the fuel injectors – which are typically mounted in the intake ports or intake manifold on port injection engines. A high-pressure fuel pump delivers fuel to a variable-pressure fuel rail. Fuel enters the combustion chamber through precision multi-hole fuel injectors. The fuel pump, fuel rail pressure, fuel injection timing, and injection duration are controlled by the engine control module. In this way, fuel is metered and delivered in a finely atomized spray.

Apart from the mounting positions of the fuel injectors, the cylinder head has conventional port and combustion chamber designs, although both are optimized for direct injection and high boost pressures. The sodium-filled exhaust valves and stainless steel exhaust manifold are durable components designed to stand up to the high-performance capability of the engine.

The unique cylinder head, fuel system, pistons, intake manifold, and the dual-scroll turbocharger are the only major components that differentiate the 2.0-liter Turbo from other members of the Ecotec engine family. Mobil 1 synthetic engine oil is installed at the factory. Synthetic oil was selected for its friction-reducing capabilities and high-temperature performance.

How direct injection works

Gasoline direct injection differs from the fuel delivery process of a conventional engine by delivering fuel directly into the combustion chamber, where it is mixed with air drawn in to the chamber. The combustion process of conventional fuel injected engines uses air and fuel that are mixed in the intake port or intake manifold prior to being introduced into the combustion chamber. Direct injection is a continuation of the evolutionary process of moving the fuel introduction point closer to the combustion location to improve control.

With the Ecotec 2.0-liter Turbo, fuel is introduced directly to the combustion chamber during the intake stroke. As the piston approaches top-dead center, the mixture is ignited by the spark plug, giving the name spark ignition direct injection (SIDI). The fuel injectors are located beneath the intake ports. SIDI allows the mixture to be “leaner” – less fuel, more air – at full power. SIDI also permits a slightly higher compression ratio than if the fuel were delivered with conventional fuel injection. The result is better fuel consumption at part and full throttle. The engine uses conventional spark plugs similar to other Ecotec engines.

A high-pressure, returnless fuel system is employed. It features a high-strength stainless steel fuel line that feeds a variable-pressure fuel rail. Direct injection requires higher fuel pressure than conventional fuel injected engines and an engine-driven high-pressure fuel pump is used to supply up to 1,276 psi (150 bar) of pressure. The system regulates lower fuel pressure at idle – approximately 752 psi (50 bar) and higher pressure at wide-open throttle. The cam-driven high-pressure pumps works in conjunction with a conventional fuel tank-mounted supply pump.

Direct injection’s precise fuel delivery enables more complete combustion to help reduce emissions, particularly on cold starts – the time when most engine emissions are typically created. Also, direct injection permits higher a compression ratio in the engine which is a positive influence on fuel economy. At certain power levels, the boosted SIDI engine can provide significant fuel economy benefits to the vehicle compared to a larger displacement naturally aspirated engine.

Turbocharging system

A unique, dual-scroll turbocharger is partnered with an air-to-air intercooling system to provide up to approximately 20 psi (1.25 bar) of power-enhancing boost. The dual-scroll turbocharger delivers nearly instant response, as dual exhaust passages from the engine to the turbine housing guide exhaust gas to the turbine. This reduces lag time, or spool-up, at low rpm.

“There is virtually no lag with this system,” said Groff. “Throttle response is immediate. The engine acts like a larger displacement engine.”

The turbocharger is matched to the engine’s displacement and performance objectives. It is supported by the air-to-air intercooling system, which uses fresh air drawn through a heat exchanger to reduce the temperature of the warmer compressed air forced through the intake system by the turbocharger. Inlet temperature is reduced by approximately 212 degrees (100 degrees C), enhancing performance because cooler air is denser and promotes optimal combustion.

Dual cam phasing

The camshafts of the Ecotec 2.0-liter Turbo engine have phasers that support the continuously variable intake and exhaust valve timing. They also have cam position sensors, so that the engine control module can accurately control valve timing. The crankshaft and camshaft position sensors are digital. A new engine controller, specific to the engine, is used to sense and control the engine’s performance parameters.

Variable intake and exhaust timing works synergistically with both the gasoline direct injection and turbocharging systems. The variable engine timing enabled by cam phasing allows the combustion process to be optimized. Also, valve “overlap” at low rpm can be adjusted by the controller to increase the response of the turbocharger, providing a more immediate feeling of power.

Ecotec family traits

The Ecotec 2.0-liter Turbo is built on a global platform that was designed at the outset for a range of performance and combustion capabilities. The Gen II block supports the high-performance demands of the engine, but it is merely a strengthened version of the original Ecotec architecture. The oil pump, for example, is the same as used in all other Ecotec engines. It was originally designed to support high-performance applications of future engines.

“The 2.0-liter Turbo is the pinnacle of Ecotec performance to date, with additional growth planned. The groundwork for its capabilities was layed on the drawing table at the very beginning of the Ecotec’s development,” said Groff. “Prior work and a far-thinking engine design continue to help GM respond to market demands around the globe more quickly and with greater accuracy.”

This new Ecotec family member also has traits that have helped forge a reputation for durability and sophistication:
  • Dual overhead camshafts (DOHC) and four valves per cylinder
  • Twin counter-rotating balance shafts for operational smoothness
  • Electronic throttle control
  • Low-friction, roller-finger follower valvetrain with hydraulic lash adjusters
  • Low-maintenance chain-drive for the camshafts
  • 58X crankshaft positioning
  • Direct-mount accessories, which reduce or eliminate traditional sources of noise and vibration
  • Full-circle transmission mount to reduce noise and vibration
  • GM Oil Life System, which can reduce the frequency for oil changes
  • Innovative cast-in oil filter housing, which eliminates the need to crawl under the vehicle to perform oil changes and eliminates throwaway oil filter cans that retain used oil
As with other engines in the Ecotec family, the 2.0-liter Turbo engine also has premium features designed to ensure smooth and quiet operation, including a polymer coating and skirt design for the pistons that reduces noise during cold starts. An automatic hydraulic tensioner also is used to maintain optimal tension on the timing chain, which reduces noise and vibration.
 

·
Registered
Joined
·
623 Posts
Discussion Starter #2
That engine is SWEET!
 

·
Registered
Joined
·
745 Posts
Why 2.0 and not 2.4

I read these posts and this combo sounds fantastic. The only question is if the 2.0 and 2.4 are both ecotech motors, meaning the same family, why didn't they match the stock displacement, thus making even more power with more size? Maybe one of the tech guys know?
 

·
Registered
Joined
·
110 Posts
As to why the 2.0 liter version of the ecotec was chosen :
as I recall, GM's press release mentions the fact that the new turbo ecotec has thicker walls surrounding the cylinders for added strength/roundness.
This may not have been possible with the larger displacement 2.4 (assuming the
2.4 has a larger bore, not just a larger stroke). Also, they mention fuel economy
as a factor, which would argue for the smaller displacement, and I
believe they felt that, with the advent of direct injection, power would measure up to the 2.4 when not under boost conditions. Those are my guesses.
 

·
Registered
Joined
·
554 Posts
New Sky Redline

Just in case you haven't figured it out yet, the new Sky Redline will be introduced as a Yellow only car. This should keep the orders down to a manageable amount :banghead:

Oh, and get this. Leather is still an option on the Redline version too! But at least you get a leather wrapped steering wheel this time when you choose cloth interior (yes, cloth is standard on the Redline).
 

·
Registered
Joined
·
623 Posts
Discussion Starter #8
Delnari said:
Just in case you haven't figured it out yet, the new Sky Redline will be induced as a Yellow only car. This should keep the orders down to a manageable amount :banghead:

Oh, and get this. Leather is still an option on the Redline version too! But at least you get a leather wrapped steering wheel this time when you choose cloth interior (yes, cloth is standard on the Redline).
Yellow only? Doesn't matter for me!
 

·
Registered
Joined
·
554 Posts
Speculation time again...

Sky base price $24k

Redline option $3795

Leather, Monsoon, and XM optional $2195

Redline standard - $27,795
Redline Fully Loaded - $29,990

You can get any color you want, so long as it's yellow :lol:
 

·
Premium Member
Joined
·
2,165 Posts
20 pounds of boost... All I can say is YIKES!!!!! :willy: That is a lot of boost. I imagine there is not a lot of room there for more boost without using a different turbocharger...

I wonder how easy/hard is going to be to raise the boost more??? :eek: :confused: I'm sure that will be the first thing a lot of owners will attempt to do...

Sounds AWESOME!!! I can't wait for the "official" announcemet of the Sky Redline. :cheers:

Regards,

:willy: S.D. :willy:
 

·
Registered
Joined
·
554 Posts
Sky Dealer said:
20 pounds of boost... All I can say is YIKES!!!!! :willy: That is a lot of boost. I imagine there is not a lot of room there for more boost without using a different turbocharger...

I wonder how easy/hard is going to be to raise the boost more??? :eek: :confused: I'm sure that will be the first thing a lot of owners will attempt to do...

Sounds AWESOME!!! I can't wait for the "official" announcemet of the Sky Redline. :cheers:

Regards,

:willy: S.D. :willy:
Given the internals being used and the low rpm settings there should be room to raise the boost to 26-28 lbs. Retuned ECU, larger injectors, high volume fuel pump, and premium fuel should be good for 300/300 numbers.
 

·
Registered
Joined
·
110 Posts
Given the internals being used and the low rpm settings there should be room to raise the boost to 26-28 lbs. Retuned ECU, larger injectors, high volume fuel pump, and premium fuel should be good for 300/300 numbers.
Agreed : the internals should enable HP levels beyond 400 HP, based
on what GM claimed for built up 2.4 ecotecs with their proposed supercharger kit. Basically, it's forged everything along with beefier main caps and cylinder
walls. I don't see any internal weaknesses that would limit some pretty hefty buildup programs. Since direct injectors have just now appeared with GM, I don't know where one would go to find them if they had to be upsized. I also
would assume that larger turbos would be required.
 

·
Registered
Joined
·
623 Posts
Discussion Starter #13
Delnari said:
Speculation time again...

Sky base price $24k

Redline option $3795

Leather, Monsoon, and XM optional $2195

Redline standard - $27,795
Redline Fully Loaded - $29,990

You can get any color you want, so long as it's yellow :lol:
Yes! 30k.
 

·
Registered
Joined
·
185 Posts
Sky Dealer said:
20 pounds of boost... All I can say is YIKES!!!!! :willy: That is a lot of boost. I imagine there is not a lot of room there for more boost without using a different turbocharger...

I wonder how easy/hard is going to be to raise the boost more??? :eek: :confused: I'm sure that will be the first thing a lot of owners will attempt to do... :willy:
I am insanely happy with the quoted power to weight ratio, which vastly exceeds all my expectations. It is hard for me to appreciate anyone who needs 300 or more HP in this car, but to each his own.

I'm not here to put down anyone who needs more power but hopeful that maybe we can bask in the glory of this huge unexpected surprise at having such a competent high-performing roadster stock from an American source. I'm stunned. I am pleasantly stunned. And can't wait to order one.
 

·
Registered
Joined
·
11 Posts
kingarthur said:
Since direct injectors have just now appeared with GM, I don't know where one would go to find them if they had to be upsized.
that's 1 thing we all need to think about. will the stock injector be able to support hp into the 300's? or will we need to upgrade? who makes high lph injectors for the direct injection application? i hope there are some... if not, either it will cost a pretty penny to get a set made.
 

·
Premium Member
Joined
·
2,360 Posts
need4speed said:
that's 1 thing we all need to think about. will the stock injector be able to support hp into the 300's? or will we need to upgrade? who makes high lph injectors for the direct injection application? i hope there are some... if not, either it will cost a pretty penny to get a set made.
I expect GM to release Stage 1 & 2 kits over time like they did for the LSJ Supercharged engine. However for us it'll just involve larger injectors and an ECU retune to control the redline and the boost levels from the Turbocharger. As GM perfects this system and the VVT controlling it, make evolutionary changes to the Turbocharger system etc we can more then liekly expect future revisions to gain in power. I'm pretty sure a Stage 2 GM kit could push this engine to 300HP. The rest of the platform (intake, 2.5" exhaust, tranny, rear diff, etc) can more then likely easily handle this too I bet.

One of the best parts about this engine too thanks to direct injection;
Recommended fuel: premium recommended but not required
 

·
Registered
Joined
·
47 Posts
Does it make sense that an auto manufacturer would release upgrades to this 2.0L engine? Why wouldn't they just offer a larger V6 engine in a couple of years to restart the interest in the car? I think the 3.8L V6 would be a nice choice.
 

·
Registered
Joined
·
56 Posts
Yellow only? :-/

This car is really getting my blood pumping. :) I never really liked the design of the Solstice, but with the new front facia, the GXP version looks a lot sportier. I'm still not fond of the trademark Pontiac intake design, though... somehow it makes the car look more robotic or "under water" than an actual car.

I'm a bit befuddled... why only yellow? I know Chevy pushes yellow on the Z06 Corvette due to the yellow Le Mans Corvette race car, but I can't find the logic behind pushing the same (or similar) yellow on a Sky or Solstice. Even the Z06 has a good number of color options.

I guess that makes choosing the color of the car that much easier. I'm still holding out for Redline. :)
 

·
Registered
Joined
·
231 Posts
CarJunkie said:
Does it make sense that an auto manufacturer would release upgrades to this 2.0L engine? Why wouldn't they just offer a larger V6 engine in a couple of years to restart the interest in the car? I think the 3.8L V6 would be a nice choice.
Of course it makes sense. How many people on this and the Solstice forum are already talking about how to get more HP from their car? Look at how big the aftermarket parts industry has become. (It's a couple billion $ a year) There's a market for it and GM can make some money by trying to get a small slice of that while creating more enthusiasm for their products.

The 3.8L V6 is a tired motor that needs to be retired from production. It's very reliable but it's only making, what, 205HP and it sounds like it's going to explode at high RPM's. That's taking a heck of a lot of weight penalty for 30-40HP over a base Solstice and less then the GXP. The Solstice/Sky's purpose is to be a peppy, rev-happy, nimble roadster. The 3.8L would turn it into a sluggish, torquy, and possibly nose heavy with no hope of winning the press's praises when put up against a Miata or S2000. The 2.0L Turbo should climb the RPM band quickly, provide more then enough HP to compare to an S2000, and embody what a roadster is all about.
 

·
Registered
Joined
·
6 Posts
Additionally, GM (and other manufacturers) has been fairly vocal about wanting to be apart of this "aftermarket" part suppliers. So, it makes sense that it would have additional parts to increase the hp. It is not so unlike the SRT4 and the various stage of tunes available directly from Dodge.

I also agree that you will not see a larger motor from GM directly. I think it'll allow mallett (and others) to take that ball for the few people with the money and desire for the extra power and torque the other engines offer.

Besides, with a couple of "stages", I'm sure the turbo will be well over 300 hp when it's all said and done.
 
1 - 20 of 66 Posts
Top