My 2022 CX5 MAZDA seems to do a good job with cylinder deactivation. I can watch it operating on the info screen. I just notice a small burp when it changes. Possibly they retard timeing a few MS during the change to soften the switch? Ed
Who does cylinder deactivation well?
- Thread starter Dave Sherman
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Prior to putting the flowmaster on my Ram, I could only tell if I gave it some throttle, but not enough to force a downshift, or if I was going up a hill. There’s a super brief hesitation that I notice, but my wife doesn’t. Never bothered me though, haven’t experienced any other brands implementations of it to form an opinion. I’d say it’s a well implemented system.
With the flowmaster you can tell instantly by the change in the sound, but that’s entirely my fault… I just use range select so I only hear sweet sweet full time v8 HEMI noises.
With the flowmaster you can tell instantly by the change in the sound, but that’s entirely my fault… I just use range select so I only hear sweet sweet full time v8 HEMI noises.
I dove a 300C with the 5.7 Hemi over 15 years back and the cylinder deactivation was seamless. Really helped with mpg at steady cruise too. You would have thought the others could have caught up by now.
Is that relevant?
As far as own, just the Honda. And VCM has been disabled for some time.
I've driven it in family's Ram and Sierra.
I just don't really see the point of it.
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FCA's implementation is excellent, as @The Critic noted, particularly on the DT trucks, which have frame-mounted dampners, you really can't feel it (though I can hear it with the Borla cat-back).
Fuel savings. I don’t see anything wrong with that as long as the engine will last the duration of most ownerships.
You mad about something bud?
I suppose. I've noticed no fuel economy difference before and after disabling VCM on my Odyssey.
It takes a certain amount of power (and therefore fuel) to move an object, right?
Hybrids deactivate all the cylinders pretty well 
I have it actively working on my 2015 Pilot now with 105k miles. I don’t find it that annoying and indifferent to the operation of it. I don’t think they do a bad job of it but maybe I am the outlier.
I think Texas Speed & Performance does cylinder deactivation the right way.
https://www.texas-speed.com/c-3255-dodafmvvt-delete-kit_chevrolet-silverado1500-2017.aspx
https://www.texas-speed.com/c-3255-dodafmvvt-delete-kit_chevrolet-silverado1500-2017.aspx
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Engine efficiency at low throttle blade pitch suffers, so the idea here is to cut the displacement in half, which in turns requires an increase in throttle opening to produce the same amount of power, which increases efficiency.
That makes sense. Didn't think about manifold vacuum as drag.
FPNI 87% of the time.
Sure they do, those that allow you to turn it off...Nobody does cylinder deactivation well
None allow you to shut it off. Not in normal driving. There are a few models where there are work arounds, and after market black boxes/ " tunes" that may or may not leave a trace in your ecm that will void your warranty. I know you were saying it in " jest". For example With the Silverado you use the manual mode and move the selector to a certain gear ( it's 5th gear in the 6 speed Silverados) great for city driving and AFM will not engage.
Was doing a lot of city driving yesterday in my 5.7L HEMI - 35-45 mph speeds. During light throttle cruise, MDS was engaged - it was not even noticeable, and neither were the transitions. I see zero reason to disable it.
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