in my persuit for better mileage I came across something that may or may not help, but will definately help with a bit more low end fueling. I found this on another site and decided on trying it out.

what you need is two 4" pieces of 14-16 gage wire, one end stripped, a 35 ohm resistor, and some snap connectors so this can be pulled off if you dont like it.

what this does is jumper between the pink/yellow 5v input to the MPA sensor and Light Blue signal and increase the voltage slightly fooling the computer into thinking there is more boost than there realy is.

my first impressions are at a stop, I can blow little puffs of greyish smoke when lightly hitting the throttle. going down the road I did notice something different though. the turbo seemed to spool at a slightly lower RPM, and the grey haze that I would get when I realy got on it from low boost is almost gone. all this was taken from my house to the shop I work at. roughly 30 miles. The butt dyno is not telling me anything, but with my radio off I can tell the turbo sounds different when I take my foot completely off the throttle, and spins up a bit quicker at acceleration.

now comes the fuel mileage. I cleared out my computer (which reads 2.3mpg low) and I have not noticed any loss or gain in mileage, the true test will come at the pump.

I am planning on making up a 33 ohm resistor and see what it will do since it will let more voltage through and fool the computer into thinking there is a it more boost. I'll try and get some pictures up, this weekend.

 

Keep us updated you CTD guinea pig.

 

having worked with diesels for the past 11 years either for the military or with me tooling and farting around with them on my own, and my experience with electronics, this will be fun

I might wire a switch with a 3 or so ohm resistor and see if I can black out an entire intersection [sm=badbadbad.gif]
by doing that your telling the computer you have full boost, so it's dumping fuel to keep up

if I do come across something that increases mileage by no less than 1.5mpg I'll let yall know

 

that's funny... mine is 2.3 mpg high (20.5 on the overhead = 18.2 calculated mpg)

 

I never had the white smoke flash, which is also supposed to give a correction to the computer.

 

huh? what's the white smoke flash? they re-flashed the pcm to fix something and added the overhead comp fix?

 

yes. there was an issue with the 04's where when first started in the morning they would smoke like a freight train, but it would be white. what the flash does is reprogram the 04.5's to the 05 which gives 10 more ft-lb torque and a correction to the computer for mileage. the 04 305's had an all new program to resolve this.

 

is there a re-flash to fix the overhead mpg comp? as mentioned above, it's ~2.5 mpg off...

 

your 05 should have already had it. From what I read it helped alot with some, others it didnt do a thing, while there was a few where it made it less accurate.

BTW, I have redone the connection to the MAP sensor so I can quickly change out resistors. the previous one I had made was soldered in and couldnt be changed. Once things dry out here in a bit I'll get some pics and see how things go

 

alright guys, here are the pictures I promiced.

I have 5 pics in total incase you are wondering what I used and if you want to do the same.

this first pic was of my first run, I'll call it v1.0, it was just two short lengths of wire, two splice connectors, and a 36ohm resistor soldered inbetween with some shrink wrap to keep it protected. now while this version was not upgradeable very easy, it did the job. but I felt there needed to be some upgradeability on the resistor so I took it off.

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