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Old 05-10-2008, 01:10 PM   #1
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Default Turbo Four-Cylinder to be Offered in Future Aura?

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Turbo Four-Cylinder to be Offered in Future Aura?

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Late last month Leftlane News published spy photos of the next-generation Buick LaCrosse, which will be built on the same GM global midsize architecture as the 2010 Saturn Aura. What made the camouflaged photos unique was not necessarily the photos themselves, but the powertrain reportedly being tested under the hood of the car: the Saturn Sky Red Line's 260hp 2.0L turbocharged I4.

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Old 05-10-2008, 02:13 PM   #2
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Default Re: Turbo Four-Cylinder to be Offered in Future Aura?

I think it'd be a great idea. Some vehicles have been doing this for awhile, especially in Europe where a forced induction 4 cylinder is pretty much the standard in what they consider large cars (for us, that'd be mid-size ).

Just think, if they're talking low 30's in a slightly larger car than the Aura (G8, LaCross), imagine what it would do in the lighter weight Aura? Could we possible be seeing high 30's and even 40 mpg out of a mid-size, non-hybrid, gasoline powered car? It would be a giant step forward for GM.

Now, offer it in a stick shift, and I'm going to really have to rethink that convertible as my next car...

GM, are you listening?

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Old 05-10-2008, 09:56 PM   #3
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Default Re: Turbo Four-Cylinder to be Offered in Future Aura?

Please note, You only get good mileage with a big car like an Aura or Le Cross and a small turbo charged I-4 when you keep the boost gage below the 0. When the boost comes on and the gas goes in, like what it takes to make 260 HP, the MPG goes down real fast. All you current and past Turbo car owners know what I am talking about.
I had a 2.6L I-4 with a Turbo and it made 300 HP. It got about 16 MPG in town and 23-24 on the highway. But I had a real hard time keeping the turbo boost off the waste gate. 300 HP in a 3200 pound car was just way too much fun. Most fun was blowing off the Mustangs with 5.0 V-8's. But then again I got the same mileage as the 5.0's did.

A 2.0 L 260 HP in a 3600 lb car is going to get MPG's in the same range as the 3.6 V6 is. Maybe better at 55 MPH through Kansas.

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Old 05-10-2008, 10:06 PM   #4
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Default Re: Turbo Four-Cylinder to be Offered in Future Aura?

We used to have a 2005 Saab 9-3 linear. It was the light pressure turbo (175 hp) with the automatic. Over the course of the 2 year lease, it averaged almost 27 mpg in mixed driving. On the two trips we took from Michigan to Florida, it averaged 34 mpg. Even the high pressure turbo Saabs (220 hp) are known for getting very good real world fuel economy. The 9-3 is on the Epsilon platform, albeit a shorter version than the Aura.

I think small displacement turbo motors are the way to go for anything smaller than full size, and it is probably doable even on a full size car while still maintaining decent fuel economy. At $4 per gallon of gas, every extra mpg is going to count with a large number of buyers. Of course, a low coefficient of drag and low weight would also make a big difference. GM hasn't quite figured out how to lighten up a car yet since almost everything they make weighs more than the competition.

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Old 05-11-2008, 08:27 PM   #5
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Default Re: Turbo Four-Cylinder to be Offered in Future Aura?

Variable vein turbos might help some, too. Or even some kind of electronic bypass to the turbo, that way power is there when you need it and gone when you don't.

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Old 05-11-2008, 11:36 PM   #6
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Default Re: Turbo Four-Cylinder to be Offered in Future Aura?

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Variable vein turbos might help some, too. Or even some kind of electronic bypass to the turbo, that way power is there when you need it and gone when you don't.
Hey, great idea, Can I get that setup on my 3.6 PLEEEEESE

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Old 05-12-2008, 08:09 AM   #7
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Thumbs Down Re: Turbo Four-Cylinder to be Offered in Future Aura?

you gotta be kidding me. putting the LNF in the Aura instead of the Astra? somebody please slap these execs.

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Old 05-12-2008, 05:08 PM   #8
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Default Re: Turbo Four-Cylinder to be Offered in Future Aura?

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Originally Posted by bc3tech View Post
you gotta be kidding me. putting the LNF in the Aura instead of the Astra? somebody please slap these execs.
OK, I'll bite, what do you mean by LNF?

AS for the 2.0 Turbo, Definitly belongs in the Astra not the Aura.
But twin turbos on the 3.6? Works for me
Oh! Can I get that with an order of intercooler to GO, please

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Old 05-12-2008, 07:57 PM   #9
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Default Re: Turbo Four-Cylinder to be Offered in Future Aura?

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Originally Posted by Phaeton Driver View Post
OK, I'll bite, what do you mean by LNF?
LNF is the GM engine code, RPO, or order code, for the direct injected turbo 2.0L ecotec

http://media.gm.com/us/powertrain/en...2008/08car.htm

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Old 05-12-2008, 08:11 PM   #10
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Default Re: Turbo Four-Cylinder to be Offered in Future Aura?

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you gotta be kidding me. putting the LNF in the Aura instead of the Astra? somebody please slap these execs.
Logistics. The LNF is built in Spring Hill.

LNF base model with a 3.0L V6 DI Twin Turbo AWD upgrade. Sounds good to me.

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Old 05-12-2008, 08:29 PM   #11
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Default Re: Turbo Four-Cylinder to be Offered in Future Aura?

"see mileage in the low 30's"

Which mileage in the low 30's? highway, city, combined???

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Old 05-13-2008, 07:40 AM   #12
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Default Re: Turbo Four-Cylinder to be Offered in Future Aura?

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"see mileage in the low 30's"

Which mileage in the low 30's? highway, city, combined???
Assuming it's tuned for economy, like Ford's EcoBoost, mid-30s highway, high-20s city, and low-30s combined. It'd be cool if they employ it as a Miller-cycle engine.

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Old 05-13-2008, 08:24 AM   #13
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Default Re: Turbo Four-Cylinder to be Offered in Future Aura?

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Originally Posted by metgol View Post
"see mileage in the low 30's"

Which mileage in the low 30's? highway, city, combined???
i see hwy mileage in low 30s on my 3.6L v6 already... unless the 2.0L turbo's going to put out 252hp (doubtful) then what's the point? a pretty boost gauge & premium fuel requirement?

now a TT epsilon's already being "beta tested" at GM for the 2010 platform as i've said before, THAT would be fun

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Old 05-13-2008, 09:21 AM   #14
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Default Re: Turbo Four-Cylinder to be Offered in Future Aura?

I get around 30 highway, too. ~28 since summer gas took affect. I only drive 62 mile of highway each way to school. So I'm getting ~30, but I'm bringing it up to that after some in town driving.

Yesterday the DIC exceeded 42mpg in town, woohoo, I did reset econ after the car was warmed. Kind of exciting no matter how truthful it is. 40mph in overdrive= ~1100rpm.

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Old 05-22-2008, 03:11 PM   #15
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Default Re: Turbo Four-Cylinder to be Offered in Future Aura?

Sounds cool, but the cost of premium gas isn't gonna help at all
(required for the LNF)

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Old 05-22-2008, 07:28 PM   #16
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Default Re: Turbo Four-Cylinder to be Offered in Future Aura?

Quote:
Originally Posted by Spazie View Post
I think it'd be a great idea. Some vehicles have been doing this for awhile, especially in Europe where a forced induction 4 cylinder is pretty much the standard in what they consider large cars (for us, that'd be mid-size ).

Just think, if they're talking low 30's in a slightly larger car than the Aura (G8, LaCross), imagine what it would do in the lighter weight Aura? Could we possible be seeing high 30's and even 40 mpg out of a mid-size, non-hybrid, gasoline powered car? It would be a giant step forward for GM.

Now, offer it in a stick shift, and I'm going to really have to rethink that convertible as my next car...

GM, are you listening?
Fuel economy figures in the middle 30's from the LNF-equipped family sedan would be an impressive feat for the General. Sad to say, especially for buyers who prefer to row their own gears, I don't think we'll see a manual because the take rate has historically been low. The 6T40 and 6T70 Hydramatic should be more than up to the task of maximizing the powerband of a direct injection turbocharged mill.

GM should also give the 2.4L HCCI a try.


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Old 05-23-2008, 08:53 PM   #17
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Default Re: Turbo Four-Cylinder to be Offered in Future Aura?

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Sounds cool, but the cost of premium gas isn't gonna help at all
(required for the LNF)
Either there is something weird going on with the LNF or fueleconomy.gov is wrong. Premium fuel is recommended for the Sky R/L, Solstice GXP and Cobalt SS turbo but the HHR SS shows regular grade is recommended. Anybody know if the HHR SS really recommends regular grade gas? You would think with direct injection they could get it to run on regular gas, even with a higher pressure turbo without killing much hp.

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Old 05-24-2008, 03:19 AM   #18
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Default Re: Turbo Four-Cylinder to be Offered in Future Aura?

Maybe it's not required with the Automatic???? (since it's toned down)

Here it says it's not required:
http://cars.about.com/od/chevrolet/f...y_hhr_ss_2.htm

And then here it says it is:
http://www.motortrend.com/cars/2008/...ons/index.html


Doesn't say anything on the Chevy website though

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Old 05-26-2008, 01:39 AM   #19
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Default Re: Turbo Four-Cylinder to be Offered in Future Aura?

I like the ideas of turbos. My mom's 05 XC90 AWD is a 2.5L Turbocharged 5-cylinder that gets 20 around town (suburbs), and 24 on the highway (75mph). For a two ton vehicle, it's pretty impressive. We use the mid-grade fuel on it.
-Joe

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