05-22-2013, 09:56 PM | #15 | |
Drives: 2016 Mazda6, 2011 Mustang 5.0 Join Date: Mar 2010
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Quote:
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05-22-2013, 10:00 PM | #16 |
Drives: 2016 Mazda6, 2011 Mustang 5.0 Join Date: Mar 2010
Location: Portage, Wisconsin
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Power, fuel economy, affordability. You can choose two.
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05-23-2013, 09:33 AM | #17 | |
Drives: 16 Camaro SS, 15 Colorado Join Date: May 2009
Location: Jefferson City, Missouri
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I wonder if there is something else affecting mileage for the ATS, or if the weight loss really doesn't help mileage much?
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05-23-2013, 07:39 PM | #18 | |
Drives: 2016 Mazda6, 2011 Mustang 5.0 Join Date: Mar 2010
Location: Portage, Wisconsin
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Quote:
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05-23-2013, 08:20 PM | #19 | |
Drives: 2011 2SS/RS LS3 Join Date: Nov 2011
Location: Torrance
Posts: 14,466
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Quote:
Especially for the V-8s, more and more gimmicky features...AFM, 1st to 4th, etc., are used to get high mileage numbers to satisfy the gov....and can be easily by-passed or unused by the driver... The next gen LT-1 engines will have AFM in both manual transmission and automatic transmission cars. The Vette's will have a default driving mode that doesn't include AFM being active, you'll have to choose it. If the government actually matches what drivers get for mpg, and eliminates the gimmicks that the factory can use to get a high rating, I think the party will really be over...lol... Last edited by 90503; 05-25-2013 at 10:05 AM. |
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05-23-2013, 09:07 PM | #20 |
RIP - Convertible SS
Drives: '13 Mustang Boss 302 - RED Join Date: Apr 2011
Location: Houston, TX
Posts: 960
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3
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05-23-2013, 10:54 PM | #21 |
Drives: 2014 Camaro SS 1LE Join Date: Sep 2012
Location: Vancouver, WA
Posts: 562
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05-25-2013, 09:33 AM | #22 |
Switchin' n Twitchin'
Drives: 2011 Camaro Join Date: Nov 2010
Location: Chula Vista, CA (Eastlake)
Posts: 3,145
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Already does, 1-6 and reverse
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05-31-2013, 02:51 PM | #23 |
Drives: 2020 ZL1 1LE Join Date: Sep 2012
Location: Austin, Texas
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We're stuck with 14.7:1 fuel/air mixture. Big engines suck in more air which in turn needs more fuel. So displacement works against you. Therefore to get the best fuel economy you need smaller displacement. Turbo/blower engine would be one method, AFM the other. Either would need to be supplemented with reduced weight and better aerodynamics.
In either case, in part throttle it would run on reduced displacement, getting your 30 mpg. The turbo/blower effectively increases displacement by forcing in more air, so your 3.5 liter can be a 6 liter with boost. AFM of course just reduces/add cylinders. I think GM should raise the price of Camaros (or at least the V8 models) to limit their numbers and play the CAFE averaging game that way. This would keep the cars at higher margins/quality/performance. Create a different fuel economy oriented car for the buyers that are about fuel economy eg Cruze SS, 130R etc. BMW eventually went the turbo route. I hate AFM myself, so I would rather have a turbo v-6 or pay a gas guzzler tax when buying the v-8. |
05-31-2013, 03:06 PM | #24 |
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Lol smartass. You know what I meant.
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05-31-2013, 06:35 PM | #25 | |
Camaro fan since birth
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When the car goes into AFM mode, it may only be putting fuel into 4 cylinders, but it still has the friction of 8. Therefore, the other 4 have to work a bit harder, aka more throttle, which equals more air entering the 4 working cylinders. The only gain is you don't have as many combustion losses out of 4 cylinders vs 8 cylinders. That is why the gain in MPG seems minimal. BMW went the turbo route mostly because it is a European based company. Most countries in Europe tax a car based on engine displacement. It's not a very fair system because nothing is an apples to apples comparison.
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05-31-2013, 09:17 PM | #26 | |
"Catharine"
Drives: '11 2SS/RS LS-3 IOM/IO vert Join Date: Mar 2011
Location: Southern NH
Posts: 2,132
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Edit: I find it interesting that my 4-cyl 1993 Toyota pickup was rated 28MPG highway and the best mileage pickup said company makes in 2013 is rated 25MPG highway. 20 years of improvements in technology, and they have DEcreased 3MPG! Perhaps they measure it differently now. But still ... come on! This is why I rebuilt the head at 316,000 miles rather than buy a new truck.
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06-01-2013, 04:27 PM | #27 | |
Drives: 1ss in Blue Ray Metallic Join Date: May 2013
Location: San Diego, CA
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Also 20 more years of govt saftey regulations that require the trucks to be heavier and 20 years of consumers demanding more and more stuff in their trucks.
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2013 1SS M6 with Flowmaster Pro 10 axle back and CAGS shift skip eliminator
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06-01-2013, 06:01 PM | #28 | |
Camaro fan since birth
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