|
|
Joined: Jul 2006
Posts: 9
Newbie
|
OP
Newbie
Joined: Jul 2006
Posts: 9 |
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?
|
|
|
|
|
Joined: Jul 2003
Posts: 3,816
Hard-core CEG\'er
|
|
Hard-core CEG\'er
Joined: Jul 2003
Posts: 3,816 |
How about you be the first one to try it out...
|
|
|
|
|
Joined: Jul 2006
Posts: 9
Newbie
|
|
OP
Newbie
Joined: Jul 2006
Posts: 9 |
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.
|
|
|
|
|
Joined: Jul 2003
Posts: 3,816
Hard-core CEG\'er
|
|
Hard-core CEG\'er
Joined: Jul 2003
Posts: 3,816 |
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.
|
|
|
|
|
Joined: Jul 2006
Posts: 9
Newbie
|
|
OP
Newbie
Joined: Jul 2006
Posts: 9 |
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! 
|
|
|
|
|
Joined: Dec 2001
Posts: 460
CEG\'er
|
|
CEG\'er
Joined: Dec 2001
Posts: 460 |
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
|
|
|
|
|
Joined: Aug 2002
Posts: 853
Veteran CEG\'er
|
|
Veteran CEG\'er
Joined: Aug 2002
Posts: 853 |
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
|
|
|
|
|
Joined: Aug 2006
Posts: 14
New CEG\'er
|
|
New CEG\'er
Joined: Aug 2006
Posts: 14 |
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 )
_________________________________________________
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)
|
|
|
|
|
Joined: Feb 2005
Posts: 1,119
Hard-core CEG\'er
|
|
Hard-core CEG\'er
Joined: Feb 2005
Posts: 1,119 |
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
|
|
|
|
|
Joined: Jul 2003
Posts: 1,882
Hard-core CEG\'er
|
|
Hard-core CEG\'er
Joined: Jul 2003
Posts: 1,882 |
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.
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.
|
|
|
|
|
