I WANT AN ECONOMY TUNE! WILL BE HUGE HIT WITH DIESEL COSTS

[johnmacdonald]

I'd upgrade in a SECOND.

[mikel]

Well, the second tune listed in the Predator is the Economy tune, designed to add 3-5 MPG on the highway, 1-3 around town...
It just happens to make an extra 100rwhp too....

[Ram_tough_06]

Mike as my other post said we are loosing MPG on the tuner. Am I the only one with the loss or are others having the same problem? I track my MPG on all my trucks, partly because I have to pay IFTA tax on them. So I know my numbers are valid all hand calculated. I agree that with the U7130 gains are seen, but then again I take it to be that programmer is more as it is advertised. What is up with the U7131? Will it ever be as advertised?

http://www.diablosport.com/index.php?na ... pic&t=5932[/url]

[mikel]

Well, it will not have shift on the fly, but it should pick up mileage, if not at worst it should stay the same.
I would imagine if others were losing mileage I would have a forum full of complaints...

[Ram_tough_06]

The way that I see it is to many people look at the overhead and do not hand calculate the MPG using the U7131 programmer. If I look at my overhead it says that I am getting 22-25 MPG. So maybe we should poll the users of the U7131 and have them list the range of the fuel tank. On my 03 with the U7130 I can get over 725 miles a tank (empty), with about a 33 gal fill up or about 22mpg. That is up from the 18-19 Mpg I got stock. Like I said before the people with the Manuals and 4:10 rears the fuel curve should be changed to have the power come in at above the 2400-RPM range to conserve the fuel. Are those changes outside the capabilities of the programmer? On my 03, I have no complaints of the programmer, but on my 06 that is not the case…..

[duallydave]

ive seen a nice gain in mpg with the higher hp tunes,i would like to see a economy only tune,maybe with timing and diferent fueling but without the 100hp gain,just a straight economy tune,ram tough if your so unhappy with the 7131 just sell it and try somthing else.

[tiger094]

This topic has been brought up a couple of times, even by myself. (see previous thread by tiger094) The over head computer is off by a few mpg estimates with the predator installed. When i had stock tires and tune it was right on. Must be a percentage written into the predator program thats off, Are you listening yet johan?? Simple fix , but im sure it sells better with that particular gliche. Here are my real world #s. Stock with stock tires 17.5-18 mpg in town and 21 hwy.
I put 13.5x35 inch tires on and didnt try to figure out what the real world was, due to the tires throwing off the odometer. I purchased the u731 shortly after i put tires on and thought whoa!!! when i saw 25-27 mpg on the hwy. I was in disbelief and started double checkin the odmeter to the gallons used on fill up. I was only gettin about 15-16 in town and 19-20 hwy with the predator economy/performance tune. The predator version of stock tune got about 1/2- 1 mpg better mileage.(I say predator version, because it isnt what is stock on my truck). I tried the tow tune and was back up to 17-18 mpg in town and 21-22 hwy. Thats real mileage, the overhead says 26-27, I WISH! Oh I get 21-22hwy at 70 instead of 64 mph. Bigger tires did help after all.......woo hoo
Johan needs to earn his pay check and fix, edit the software to show accurate overhead computer mpg. Also a real economy tune is over due. When idling diesels are capable of 100-1 air fuel ratios. I here bosche makes economy injectors that get 2-3 mpg better than stock. I would think the stock ones can get close with carefull editing of injector spray.
GETTER DONE JOHAN

ON the my 4x4 version overdrive doesnt engage till 55mph, where the 2 wheel drive engaged at 50 mph. Wish mine shifted at 50mph. I drive conservatively and i always have to give more pedal around 50mpg to get it to 55 and shift, then i slow back down to 50. That is an in town scenario that may save a lil fuel if it would shift a lil earllier flowing instead of pausing on shifts.

2006 4x4 bighorn, auto, m/t 35 baja mtz , turbo silencer removed. predator tow tune.

[kw5.9]

I have noticed mpg gains, if you dont reset the over head on about the 3rd tank it is fairly accurate, on extreme 19.5mpg I am sure if I drove it easy all the time I no I would be over 20+ mpgs( not bad for a 3/4ton 4x4 4dr) this aint no half ton, I think we need to keep this in mind, for the power and the size of these trucks we are doing a lot better than those blue oval guys, and bowtie's. I have the stack but only run it when I am being chanllenged. I have had the stack for about 4months and LOVE IT!!! I an currenly saving up for the SB clutch so I can lay all the HP on the pavement, too much slipping when I get on it... just my $.02 if it means anything, I do need to learn how to down load the latest and greatest, is it true the key counts have been fixes on the 7131?
Thanks....smokem' out!!!

[johan]

Yes key counts have been fixed.
The mpg calc is a complex calculation and is based off quite a few parameters and to be honest I do not know how to fix it, not a simple task.
The issue with economy tunes is EPA, in order to give a diesel better economy you can add injection timing at cruise, will yield great gains but it will increase nox something fierce, something we do not want to do.

[tiger094]

• I'll go a giant leap forward for future possibilities. Dodge and GM both have started incorporating a version of cylinder shut down on V8's to save 25% on fuel economy. Dodge could incorporate a cylinder shut down in the diesel. I wonder if 2 or 3 cylinders could be shut down. In the 3 cylinder theory, the computer would deny fuel to every other cylinder for a period of time, gradually power all cylinders back up then shut off the other 3 cylinders. Alternating cylinders to prevent damage of extended non fueling or (under fueling). Just think of the fuel saving possibilities. the 5.9 ctd would still make a minimum of 300 ft lbs of torque running a stock tune. Cylinder shut down would reverse the stigma diesel prices have quickly put on owning a diesel.
  Here is another bit of information you may or may not be aware of: BMW HAS a vehicle that is running on hydrogen. They have found a way to safely fieasably as well as economically manufacture/store liquid hydrogen. Check there website. http://www.usautoparts.net/bmw/models/750hl.htm
  Some diesel owners have opted to supplement diesel fuel with propane for a dramatic increase in power and fuel economy, I would think hydrogen would perform in a similar manner. Hydrogen is the fuel of the future. Lets push the auto makers to the future making it a reality today.

[duallydave]

Yes key counts have been fixed.
The mpg calc is a complex calculation and is based off quite a few parameters and to be honest I do not know how to fix it, not a simple task.
The issue with economy tunes is EPA, in order to give a diesel better economy you can add injection timing at cruise, will yield great gains but it will increase nox something fierce, something we do not want to do.

is this what quadzillas max milage box does?i read it advances timing at a set rpm,1800 i think,at idle there is no advance,only while cruising aboive 1800rpms,

[Rocksolidcummins]

Wow i feel for Johan taking abusive post after abusive post from ignorant whiners who know nothing about what they are asking yet insist it must be done as if they have done it a thousand times over.... whew!!

The over head computer : there is NO way for the overhead computer to read proper milage. it is merely calculating that milage based on the data it SEES from the OBD computer, mainly map sensor, vehicle odometer, throttle position sensor and of course the percentage of load against the fueling tables. All of these pieces of data are altered by the Predator to achieve the proper fueling and boost tables that enable the programmer to make extra power.

All of the fuel that we are adding to our trucks goes unnoticed by the factory ecm, and therefore also by the overhead computer. of course the reading is incorrect; it would be like adding a boost fooler to your map sensor and than using an electronic boost gauge and tapping for the signal after it has been altered by the boost fooler. the electronic gauge picks up a signal that has been limited to only show so much boost in order to make the computer produce more and not throw an overboost code - therefore the gauge would always read less boost than what is actual.

the mpg computer just sees lots of forward movement, not a lot of boost and not a lot of fuel and assumes the truck is getting killer milage, when the programmer is really over boosting and over fueling behind the scenes.

the overhead computer will never read correctly, period. i dont think it has ever been correct even from factory.

more milage : in extreme tune i have seen milage increases of 2-4 mpg towing machinery, probably less when empty. without the added fuel just adding timing will increase cylinder temps to unreasonable levels and is harder on the turbo than necessary, not to mention even though egts run relatively cool, coolant temp is significantly effected, obviously because as we advance injection timing we force more of the combustion process to happen inside the walls of the cylinder. the extra fuel helps keep cylinder temps down and emissions in normal range, and to a certain extent will prolong turbo life.

[5point9]

And not to mention that cylinder deactivation, MDS, or whatever you want to call it does not benefit a diesel like it does with a (throttled) gas engine. Do some research and you will learn why (there is a clue in the last statement).

[dunejunkie]

maybe instead of bashing diablo about 1 or 2 mpg ,we should get together to bash the fuel companies charging us 4.00+ for a gallon of diesel . i dont think mpg were as much of a concern when diesel prices were around 1.00 and that wasnt to long ago