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  #11  
Old 09-24-2013, 06:23 PM
Red-Stripe Red-Stripe is offline
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After just posting above, I thought of a technical MPG sales angle you guys promoting aftermarket intakes and filters can use without lying/cheating the science. You can tout that your system:
"Handles the peak demand airflow requirements of modern cylinder deactivation engines"

Tips/donations welcome.
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  #12  
Old 09-24-2013, 09:12 PM
roo roo is offline
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Quote:
Originally Posted by Red-Stripe View Post
The reduction in overall air mass flowing will be proportionate to the increase in efficiency, since the computer maintains the fuel/air ratio. If the MDS increase your mileage ( if ), then you have consumed less gas and air.
The small technical negative that offsets this regarding an intake/filter is that when in MDS mode the slightly reduced air mass is now required to be drawn in by 4 widely spaced pulses of air mass acceleration/deceleration instead of a closely spaced 8 vacuum event which normally gives a smother slower overall airflow.
So when in MDS mode you magically need less horsepower to maintain a given speed than when all cylinders are firing? That's incredible!
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  #13  
Old 09-24-2013, 09:17 PM
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Your reduction in pumping losses are a part of your increase in fuel economy.

Last edited by roo; 09-25-2013 at 08:27 PM.
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  #14  
Old 09-25-2013, 02:21 PM
picker picker is offline
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Side note to oldhp....I see you have a express, Just because that stock muffler is BIG doesn't mean its not restricted inside. Doubt what we're telling you, slide under it and look at HOT spot about midway this is the problem on 12 express's. It has to get red hot to turn stainless that color. (nice Charger) Picker.
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  #15  
Old 09-25-2013, 05:32 PM
Red-Stripe Red-Stripe is offline
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Quote:
Originally Posted by roo View Post
So when in MDS mode you magically need less horsepower to maintain a given speed than when all cylinders are firing? That's incredible!
What's incredible is that you are trying to debate things I didn't say, and are confusing yourself in the process.
Try re-reading exactly what I posted, and if it still doesn't make sense let me know, and I'll explain it for you in more detail.
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  #16  
Old 09-25-2013, 07:59 PM
roo roo is offline
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Explain, please.
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  #17  
Old 09-25-2013, 08:04 PM
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I'm in-out this forum-busy
Which sentence/part of my post do you have issues with?
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  #18  
Old 09-25-2013, 08:22 PM
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Google "Cylinder Deactivation" and you will find that reducing pumping parasitic losses is one of the big efficiency improvements gained by deactivating cylinders. No confusion on my part, just a well known fact in the area of increasing engine BSFC. New diesels are taking mileage hits why, because most of them use cooled EGR that is introduced into the engine with the help of a ......Throttle. After treatment is also consuming more fuel with some of these new diesels.

Last edited by roo; 09-25-2013 at 08:26 PM. Reason: speeeling
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  #19  
Old 09-25-2013, 10:29 PM
Red-Stripe Red-Stripe is offline
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??? Are you debating with yourself?
I don't think I can help.

Last edited by Red-Stripe; 09-25-2013 at 10:39 PM.
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  #20  
Old 09-25-2013, 10:57 PM
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Your a funny guy.
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