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Old 06-13-2019, 06:49 PM   #21 (permalink)
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If you disconnect the 02 sensor with the car just run in Open loop? If in open loop disconnecting one injector might work OK.

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Old 06-13-2019, 07:45 PM   #22 (permalink)
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If we are talking about a 2010 Prius, delaying the intake closing further would both lower power and fuel consumption, but why would anyone want to lower the power on a Prius?
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Old 06-13-2019, 07:52 PM   #23 (permalink)
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Quote:
Originally Posted by hayden55 View Post
Drop the frontal area about 40-50%.
How would you do that?
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Old 06-14-2019, 01:52 AM   #24 (permalink)
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How would you do that?
Cut the car in half.....
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Old 06-14-2019, 02:10 AM   #25 (permalink)
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This is so dense. The awful vibes and exhaust note, and lack of power would have you BEGGING for that cylinder back, even if it halved the fe.
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Old 06-14-2019, 02:12 AM   #26 (permalink)
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This is so dense. The awful vibes and exhaust note, and lack of power would have you BEGGING for that cylinder back, even if it halved the fe.
Exactly. The timing on a 4-3 conversion is not good and it will not run well at all.
A properly designed 3 cylinder would do much better.
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Old 06-14-2019, 10:32 AM   #27 (permalink)
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The only way to disable a cylinder that will actually reduce fuel usage, would be to stop the valves from opening on that cylinder, either by removing rockers or grinding the lobe down or what not. You would also obviously want to disable the injector after you do that. There was a guy who had an old junky fiat that spun a rod bearing so his solution was to remove that rod and the one next to it, weld the oiling holes shut, then grind the cam lobes down. It was carbureted so nothing needed there. He said he picked up something like 15% fuel economy. There's videos of it running out there on the youtubes.
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Old 06-14-2019, 11:11 AM   #28 (permalink)
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I DID test this on the 'Coupe by removing the push rods and unplugging the injector(s) for three and two cylinder modes. It wouldn't start on two, but it tried and nearly did. It started and ran on three but totally SUCKED as mentioned.
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Old 06-14-2019, 12:23 PM   #29 (permalink)
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I think your ecm must have been mad about it or something, I've had more than a few 4 cylinders over the years with dead coils that are only running on two cylinders, and they still start, run and drive, albeit poorly. Vw 2.0 sohc's actually don't run that bad even on just 2 cylinders firing from bad coils, I'd imagine they'd be ok if the cylinders were actually disabled.
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Old 06-14-2019, 12:38 PM   #30 (permalink)
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Quote:
Originally Posted by Kzelisko View Post
The only way to disable a cylinder that will actually reduce fuel usage, would be to stop the valves from opening on that cylinder, either by removing rockers or grinding the lobe down or what not.
I seem to remember Cadillac selling a variable cylinder engine (the 4-6-8) that rotated the "off" cylinders so that they didn't end up with a single dead cylinder that filled with unburned oil. If one could program the Prius engine to four firings and one skip, (1,3,4,2,X,3,4,2,1,X,4,2,1,3,X,2,1,3,4,X,....), giving sixteen firings per ten revolutions, (or 80% the firings of a non-modified four cylinder) one might attain a 20% improvement in cruising mileage while not damaging the one cylinder.

Another rotating pattern might be to skip every third firing (1,3,X,2,1,X,4,2,X,3,4,X,....), giving eight firings per six revolutions. (66.666...% the firings of a non-modified four cylinder)


Taken to absurdity, firing one, and skipping the next two (1,X,X,2,X,X,4,X,X,3,X,X,....) would yield four firings per six revolutions,(33.333...%) rather than the normal twelve.

Might make sense on an older non-hybrid four, but it doesn't really make sense on a Prius.

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