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