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azs
Newbie

Reged: 07/03/06
Posts: 9
better gas mileage
#1302649 - 08/18/06 12:20 AM

hello,
I have a 2.5 duratec, and have been wanting better gas mileage on the highway, i was wondering if it's possible to make a switch to turn off a few of the fuel injectors, so i potentially would have a four cylinder engine, much like chevy suburbans have the "on demand engines" that turn off some of the injectors during highway driving. Would this idea work, or would the pcm get screwed up, or possibly ruin my engine?


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Big Daddy Kane
Hard-core CEG'er

Reged: 07/22/03
Posts: 3816
Loc: Ramstein AB, Germany
Re: better gas mileage new
#1302657 (Re: azs) 08/18/06 12:37 AM

How about you be the first one to try it out...

--------------------
Goin' Round Traffic Circles @ 50Km/h!!!
\m/ -- 1998 E0 SVT #2119 of 6535
\m/ -- 2003 Sentra SE-R Spec V

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azs
Newbie

Reged: 07/03/06
Posts: 9
Re: better gas mileage new
#1302663 (Re: Big Daddy Kane) 08/18/06 12:46 AM

so that idea is a bust, i figured it could be worth a shot, maybe even for just one injector, than the engine would act similar to having a clogged fuel injector, o well.

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Big Daddy Kane
Hard-core CEG'er

Reged: 07/22/03
Posts: 3816
Loc: Ramstein AB, Germany
Re: better gas mileage new
#1302666 (Re: azs) 08/18/06 12:48 AM

Originally posted by azs:
so that idea is a bust, i figured it could be worth a shot, maybe even for just one injector, than the engine would act similar to having a clogged fuel injector, o well.




Really, it would probly just run like dog crap, which would more than likely trip the CEL, which would keep you in open loop, which in turn would probably decrease fuel economy due to the "fixed" settings in the ECU.

--------------------
Goin' Round Traffic Circles @ 50Km/h!!!
\m/ -- 1998 E0 SVT #2119 of 6535
\m/ -- 2003 Sentra SE-R Spec V

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azs
Newbie

Reged: 07/03/06
Posts: 9
Re: better gas mileage new
#1302674 (Re: Big Daddy Kane) 08/18/06 12:54 AM

Originally posted by Big Daddy Kane:
Originally posted by azs:
so that idea is a bust, i figured it could be worth a shot, maybe even for just one injector, than the engine would act similar to having a clogged fuel injector, o well.




Really, it would probly just run like dog crap, which would more than likely trip the CEL, which would keep you in open loop, which in turn would probably decrease fuel economy due to the "fixed" settings in the ECU.





i'll just try it out for kicks, unplug two of the injectors, see how it runs, stupid computers!

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98SVTC
CEG'er

Reged: 12/17/01
Posts: 460
Loc: Rowland Heights, Ca.
Re: better gas mileage new
#1302721 (Re: azs) 08/18/06 01:43 AM

I think that there's a lot more to it than switching off injectors. You'd need to switch off the spark plugs and your four cylinders will still have to overcome the compression of the two dead cylinders unless you can figure out a way to keep the valves open. As someone already stated, it will probably run like dog doo doo.
Karl

--------------------
*** It's all about consistency! ***
*** Previously 88SVT ***

06 F150 Supercrew 5.4L FX4
98 SVT Contour #4362 Born 1/6/1998
86 Ranger GT (For Sale)
69 Fiat 850 Sport Spider (For Sale)
67 Formula-S Barracuda

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BlackE1
Veteran CEG'er

Reged: 08/17/02
Posts: 853
Re: better gas mileage new
#1302931 (Re: azs) 08/18/06 11:37 AM

What kind of mileage are you looking for?? There are modifications that can be done to increase fuel economy. I installed headers and a cold air intake. I noted a 6-10 mile per gallon increase in fuel economy.

Maybe you should try some of the easy things before you start re-designing the duratec.

Clean all carbon out of engine
clean or get new air filter
spark plugs and wires
change oil
make sure the engine is tuned up
tire pressure is correct


--------------------
98.5 Black SVT with 34k miles Build #5683 Born on 4\15\1998
WR Headers GMK CAI
Blaupunkt system fiberglass tweeter pods
L.E.D. tail lights in the works


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murky024
New CEG'er

Reged: 08/14/06
Posts: 14
Loc: State College, PA
Re: better gas mileage new
#1302953 (Re: azs) 08/18/06 12:17 PM

DOD (displacement on demand) engines have technology and design that lets them run on 1/2 the cylinders. So their cranks and firing order is going to be setup to run without problems on 1/2 the cylinders. If you tried to make this work it would make you think you had a HUGE misfire problem and you would probably get worse gas mileage.

If you want better gas mileage do plugs, wires, O2 sensor, air filter, fuel filter, clean injectors, ensure your cat and exhaust flows well. (get rid of flow obstructions) and then if you REALLY want to get into it you can have your computer reflashed by a company that tunes theses cars (don’t know any as I am a noob to CEG) for a REAL lean cruising tune… (I know people in the Grand Prix world that have tuning flashes for long drives because they have a tune that will get them 36 mpg on the highway in a cruise… sure, if they went full throttle they would blow a piston or six )


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_________________________________________________

2000 Grand Prix GTP (best 1/4 mile 13.87 @ 100)
1995 Contour SE (Faster than the GTP because it doesn't have a chipped piston)

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ZeroHour
Hard-core CEG'er

Reged: 02/08/05
Posts: 1119
Loc: Eastern PA
Re: better gas mileage new
#1302980 (Re: azs) 08/18/06 01:26 PM

Okay don't rip into the new guy too much.


It was a good try, but yes there are many, many variables and years of engineering behind the cyclinder shut off technology. If was that easy, most cars would have it installed and it wouldn't add (from what I understand) ~ 2k to the price tag of the vehicle...

And the people at gm wonder why the company is tanking! Good thought, but bad cost production.

--------------------
1998 SE Duratec V6 ATX
Ebay intake with K&N Filter
Trubendz Exhaust
Custom Hood

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IRingTwyce
Hard-core CEG'er

Reged: 07/01/03
Posts: 1882
Loc: Graham, TX
Re: better gas mileage new
#1303093 (Re: ZeroHour) 08/18/06 03:53 PM

Anyone remember GMs stellar V4-6-8 from the eighties? I'm rather skeptical about displacement on demand now, mainly due to experience with the 4-6-8 in the past. They couldn't make it work right then, and I'm willing to bet that reliability and longevity are going to be sub-par this time around.

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BrApple-its all in the way it is presented...but everythign on my resume is all me
TexasRealtor-I hope you spelling improves on your resume.
MxRacer-ladies and gentlemen, welcome to ironyville. population, texasrelator.

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murky024
New CEG'er

Reged: 08/14/06
Posts: 14
Loc: State College, PA
Re: better gas mileage new
#1303137 (Re: IRingTwyce) 08/18/06 05:33 PM

Originally posted by IRingTwyce:
Anyone remember GMs stellar V4-6-8 from the eighties? I'm rather skeptical about displacement on demand now, mainly due to experience with the 4-6-8 in the past. They couldn't make it work right then, and I'm willing to bet that reliability and longevity are going to be sub-par this time around.




They didn't have VVT and the complex drive by wire systems. Look at the fuel injection systems of the 80's direct port EFI… Now they have fuel injection systems that inject right into the head allowing the gas to cool the combustion chamber and better use of fuel... 80's is so long in the past.

DOD is a good idea but it isnt the best idea as you are still spinning the mass of the 8 cyl engine... So it won't be as efficient as a standard 4 cyl. But I dont know many 4 cyl that get 30 mpg when they make 300+ hp either...

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_________________________________________________

2000 Grand Prix GTP (best 1/4 mile 13.87 @ 100)
1995 Contour SE (Faster than the GTP because it doesn't have a chipped piston)

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todras
I have no life

Reged: 05/29/00
Posts: 21197
Loc: Grand Rapids, MI
Re: better gas mileage new
#1303139 (Re: IRingTwyce) 08/18/06 05:34 PM

Originally posted by IRingTwyce:
I'm rather skeptical about displacement on demand now,





Technology does advance. Mercedes is using it so I doubt it's that quirky.

http://www.sciam.com/print_version.cfm?articleID=000F2BEF-ECD0-119B-ACD083414B7F0000


--------------------
-'96 SE MTX 3L
-'98 SVT 1,173 of 6,535
-'05 Mazda 6s, loaded, g/f's ride
-Need a 96-00 manual on CD? PM or email me


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RaraAdministrator
"Absolut Rara."

Reged: 09/09/00
Posts: 3223
Loc: Westland, MI
Re: better gas mileage new
#1303149 (Re: todras) 08/18/06 05:43 PM

well, Mercedes did have to recall all of thier "quirky" brake-by-wire systems; then there was the test of thier "quirky" adaptive cruise control that they did on a european tv show.

Personally, I think DoD is a great idea. I'd love to have an Aston Martin V12 that would just shut down one whole bank during cruise

--------------------
Balance is the Key.

rarasvt@comcast.net

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RialKnight
CEG'er

Reged: 02/05/06
Posts: 96
Loc: Racine, WI
Re: better gas mileage new
#1303176 (Re: azs) 08/18/06 10:09 PM

Originally posted by azs:

i'll just try it out for kicks, unplug two of the injectors, see how it runs, stupid computers!





That's not something you'll want to do.....remember the contour is not a GM car, the mods that u can do in an GM engine, U can't do with a Ford.

All you'll be doing is just making your engine run like crap


--------------------
1997 Ford Contour SE
Car's D.O.B. 2-15-1997 from Ford-KC Plant
Black Lighting
http://www.cardomain.com/ride/2389976

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TaurusKev
Hard-core CEG'er

Reged: 11/16/03
Posts: 3395
Loc: Hanover Park, Illinois, USA
Re: better gas mileage new
#1303493 (Re: RialKnight) 08/20/06 06:28 AM

I've ran my Contour GL on 3 injectors before... (I4) Ran like [censored] [censored].

Why? Because the harness broke. It took forever to get from 0 to 45, it vibrated to all hell, and basically it wasn't even. When I got my new fuel injector wiring harness, I was happy.

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Former owner of a 1995 Ford Contour GL w/ 2.0L ATX
Proud owner of a 2005 Ford Taurus SE 3.0L V6 Vulcan
--Looking for Commodore stuff (Drives, Units, Amiga, games, etc)If anyone has any of this laying around and wants it gone, lemme know --


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98SVTC
CEG'er

Reged: 12/17/01
Posts: 460
Loc: Rowland Heights, Ca.
Re: better gas mileage new
#1304051 (Re: RialKnight) 08/21/06 04:47 PM

Originally posted by RialKnight:
That's not something you'll want to do.....remember the contour is not a GM car, the mods that u can do in an GM engine, U can't do with a Ford.

All you'll be doing is just making your engine run like crap



You can't do it with a GM car (or any car for that matter) if it wasn't engineered from the very start with DOD in mind.
Karl

--------------------
*** It's all about consistency! ***
*** Previously 88SVT ***

06 F150 Supercrew 5.4L FX4
98 SVT Contour #4362 Born 1/6/1998
86 Ranger GT (For Sale)
69 Fiat 850 Sport Spider (For Sale)
67 Formula-S Barracuda

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