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Old 30-07-2009, 05:07 PM   #1
EDManual
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Default New v6 DI 3.0 bad fuel economy!!

Seems theres a new GM car with this engine and the economy is no better dropping from 3.6 to 3.0. Theres less torque, so has to be floored more to get into the revs to move it at the same rate. US fuel ratings have constant acceleration forces that must be met. That means it cant be driven really slowly just to get good economy.

Thats what the commodore will be like in the real world, our GOVT figures may hide it so it seems its a fair bit better than the 3.6.
Read a bit of this :
http://www.gminsidenews.com/forums/f...17-26-a-82345/

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Old 30-07-2009, 05:27 PM   #2
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Oh dear.
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Old 30-07-2009, 06:26 PM   #3
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The car is a new model Buick Lacrosse, and has a 3.6DI engine, or a 3.0DI engine. Same as our commodores.
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Old 30-07-2009, 07:09 PM   #4
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While its hard to say for sure given it isnt out yet in teh commodore...this looks ominious already. Oh where is SS baby now LOL!

Alloytec = epic fail!!!
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Old 30-07-2009, 07:10 PM   #5
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Quote:
Originally Posted by Road_Warrior
Oh dear.
Yep, 'Starfire' for the 21st century.
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Old 30-07-2009, 07:33 PM   #6
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No surprise really. Peak torque of 305Nm @ 5200rpm + 1700kg car is as quite a huge mismatch.

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Oh where is SS baby now LOL!
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Old 30-07-2009, 07:44 PM   #7
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What the conversion 17mpg and 25 mpg highway
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Old 30-07-2009, 08:00 PM   #8
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Quote:
Originally Posted by snappy84
What the conversion 17mpg and 25 mpg highway
13.8L/100Km & 9.4L/100Km - the combined figure of 20MPG equalls 11.8L/100km
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Old 30-07-2009, 08:03 PM   #9
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...and the Ecoboost will eat it!
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Old 30-07-2009, 08:58 PM   #10
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FAIL!

They're figure the FG I6 probably beats in it current guise.
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Old 30-07-2009, 08:59 PM   #11
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Quote:
Originally Posted by Chilliman
13.8L/100Km & 9.4L/100Km - the combined figure of 20MPG equalls 11.8L/100km
Wonder what the Australian Standard figure will be. I'd expect high 9s.

PS The constant acceleration figure idea in the US test is a good one.
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Old 30-07-2009, 09:04 PM   #12
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Quote:
Originally Posted by EDManual
Seems theres a new GM car with this engine and the economy is no better dropping from 3.6 to 3.0. Theres less torque, so has to be floored more to get into the revs to move it at the same rate. US fuel ratings have constant acceleration forces that must be met. That means it cant be driven really slowly just to get good economy.

Thats what the commodore will be like in the real world, our GOVT figures may hide it so it seems its a fair bit better than the 3.6.
Read a bit of this :
http://www.gminsidenews.com/forums/f...17-26-a-82345/
Even the diehard GM fans on that site are calling it an 'engine issue'. The issue is as they say, it's a crap engine

The 4th poster, mjd1001 had this to say.

Quote:
"I have said it in many other threads...I just think this engine is a huge dissapointment."
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Retrotech thread
http://www.fordforums.com.au/showthr...1363569&page=6
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Old 30-07-2009, 09:35 PM   #13
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This is one thing I just don't get about GM.

They are constantly making bigger and bigger V8's (through the ingenious re-boring process), but mention V6 to them and they go backwards making an engine more than twice as small as their current LS3?...

As mentioned, this motor is overworked in a 1700kg sedan, which is not only bad for fuel economy but also bad for engine longevity.

This 3.0L V6 would have worked well with a low-boost supercharger between the banks...
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