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post #1 of 28 Old 10-31-2012, 11:11 AM Thread Starter
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Extreme Economy Tune

I am just trying to promote an educated discussion here. This may have been thought of already.

I was wondering about some of the trucks now a days that shut down 2 or 4 cylinders based on load and throttle position and was wondering why something like that hasn't been done (that I am aware of) on the 6.0? It seems to me that it is something that could be done with a tune, maybe interrupt the electrical signal to the injectors.

Say your cruising down the highway or in town and you could flip a 3 position toggle to turn your 6.0L V8 into a 3.0L 4Cyl, or even a 4.5L 6Cyl. I could see it vibrating more due to the "misfire" but what if you could have it rotating through the cylinders, for instance just say it is hitting on all 8 cylinders, and if you flip to switch to "6 cylinder mode" it would interrupt the fuel to cylinders 1 and 2 for that rotation, then cylinders 3 and 4, then 5 and 6 and so on. I am sure there is a way based on firing order to interrupt the fuel in a way, that you would still have 1 cylinder firing on each stroke, instead of having 1 stroke where there is no firing. that would help to minimize the "misfire" vibration.

At least that way if for example you left it on 6Cyl mode for long periods of time, the "wear" on the engine could stay fairly even, versus shutting fuel on cylinders 1 and 3 the entire time, by having the misfire "rotate" through the firing order.

What made me think of this was the fact that one of my soldiers had a nice gmc sierra that would basically rotate between being a 4, 6, or 8 cylinder engine based on load, and the fact that on the highway without towing and cruise control set, he was breaking into the 30's for economy.

Whaddya guys think? Maybe some one more educated can "learn" me as to whether this would be good idea or not.

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post #2 of 28 Old 10-31-2012, 11:36 AM
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It isn't done via a tune or strategy change in the new ones. It also hasn't ever been done on a diesel. I think there is actually some sort of control module that controls fueling and all other parameters for that. When I sold cars for a living for Chrysler they had just came out with their version of the MDS Multiple Displacement System. It had flaws at first but they were able to work it out and it eventually seemed pretty neat. I don't think it will ever be a possibility for the 6.0 for something like this.

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post #3 of 28 Old 10-31-2012, 12:44 PM
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Interesting idea...

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post #4 of 28 Old 10-31-2012, 12:46 PM
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Aproaching 30 mpg, yea right. Those trucks would be sold out. Not calling you a liar, i'm calling him an embellisher of the truth. Shuddering, is what my truck did when it dropped an injector.

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post #5 of 28 Old 10-31-2012, 12:52 PM
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^^ I agree. Even with the MDS working properly on the hemi's they still were lucky to break 18mpg. They went to the MDS cause of fuel economy yes but for example the Hemi was getting 10 - 11 MPG with out the MDS and around 15-18 depending on driving habits, weather, location, type of driving etc. No where near 30 MPG. If 30 MPG was possible with these systems than everyone would be driving a truck with these systems. My wife's 07 focus gets 30 in town and 40 on the highway. Saying that a half ton v-8 truck could do the same is ludacris.

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post #6 of 28 Old 10-31-2012, 01:09 PM Thread Starter
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he told me getting close to 30. It wasn't my truck, so it is being told here 3rd hand.

I am thinking about some of the commercial trucks when they turn the jake brake on, it also cuts fuel to the appropriate cylinders (some of the older ones would still deliver the fuel) but if something like that could be done here. I use my truck as a daily driver and the average speed for my commutes between home, to post, and then driving around on post is probably around 30 mph average. I drive easy on the truck because frankly there is no room, and no need to get on it on post. anyways it sounds like a possibility. I would think it would be similar to to just simply unplug 2 injectors, but that would not have the same ease of driving, I think it would simply miss to much and to hard making it a pain in the *** to daily drive, but if it could rotate through all 8 cylinders in a sequence based on firing order, and a few other things i.e. throttle position, load etc. I think it would be fairly strait forward to drive.

It is cool to think about, according to the lie-o-meter i get somewheres around 20-22mpg on the highway (cruise set on about 61-62mph) and that is 6 liters of displacement. so in theory if you could run at those speeds on a "3.0 PSD 4CYL" you certainly wouldn't double your mileage because there would be more load on those 4 cylinders, but maybe you get upwards of 28-30MPG' s according to the lie-o-meter. LOL

Does anyone see an issue with interrupting the electrical signal to the injector? I mean would it pose any sort of mechanical issue I may be over looking?
Any suggestions on possible issues with this set up, or one similar to it?
If I knew anything about writing tunes, I wouldn't be afraid to write one and then "test drive" it around the block a time or two and start improving it from there.

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post #7 of 28 Old 10-31-2012, 01:12 PM
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Quote:
Originally Posted by turbocharged View Post
he told me getting close to 30. It wasn't my truck, so it is being told here 3rd hand.

I am thinking about some of the commercial trucks when they turn the jake brake on, it also cuts fuel to the appropriate cylinders (some of the older ones would still deliver the fuel) but if something like that could be done here. I use my truck as a daily driver and the average speed for my commutes between home, to post, and then driving around on post is probably around 30 mph average. I drive easy on the truck because frankly there is no room, and no need to get on it on post. anyways it sounds like a possibility. I would think it would be similar to to just simply unplug 2 injectors, but that would not have the same ease of driving, I think it would simply miss to much and to hard making it a pain in the *** to daily drive, but if it could rotate through all 8 cylinders in a sequence based on firing order, and a few other things i.e. throttle position, load etc. I think it would be fairly strait forward to drive.

It is cool to think about, according to the lie-o-meter i get somewheres around 20-22mpg on the highway (cruise set on about 61-62mph) and that is 6 liters of displacement. so in theory if you could run at those speeds on a "3.0 PSD 4CYL" you certainly wouldn't double your mileage because there would be more load on those 4 cylinders, but maybe you get upwards of 28-30MPG' s according to the lie-o-meter. LOL

Does anyone see an issue with interrupting the electrical signal to the injector? I mean would it pose any sort of mechanical issue I may be over looking?
Any suggestions on possible issues with this set up, or one similar to it?
If I knew anything about writing tunes, I wouldn't be afraid to write one and then "test drive" it around the block a time or two and start improving it from there.
Just to give you an idea there are over 4000 different parameters that can be altered when writing a custom tune. Getting someone to sift through all 4000 and arrange the possible correct match of parameters is a needle in a haystack type situation.

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post #8 of 28 Old 10-31-2012, 01:30 PM Thread Starter
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Originally Posted by Tuscany View Post
Just to give you an idea there are over 4000 different parameters that can be altered when writing a custom tune. Getting someone to sift through all 4000 and arrange the possible correct match of parameters is a needle in a haystack type situation.
LOL I hear ya. maybe that's why its hasn't been done yet.

I will be right back, I am gonna go get some pizza, and Cut the connectors off of 2 of my injectors and will post my results. J/K

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post #9 of 28 Old 10-31-2012, 02:30 PM
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The issue with shutting off the injector is, fuel also acts as a cushion to prevent injector tip contact with piston.

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post #10 of 28 Old 10-31-2012, 02:43 PM
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On gas engines, the engineers have to focus on keeping the proper air fuel ratio around 13-14:1 i believe. The multi-displacement engines turn off fuel and spark on those cylinders it's shutting off.

On diesels, there isn't a focus about air fuel because it could be 2:1-100:1. Take a look at the injector pulse width while you are driving. Sometimes it turns off the injectors completely on all cylinders...

Something to think about also is the harmonics of the engine when just a couple cylinders are turned off . There is a lot more involved than just turning off a couple injectors...

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