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I have read a lot of different responses on the different boards regarding the MP-8 and different levels vs. injector damage. I spoke with a TS rep today and he stated that it does not make any difference what setting the box is run at it will not hurt the injectors. He said that the best mileage gains are seen when the box is set all the way to 100%. He did note that while towing heavy (12k or >) in a hilly area it would be wise to turn the adjuster down. He stated that even though the box may be set on the highest setting that it does not hold the FP at the max constantly. (something about an algorithm program) He also noted that all the company trucks have the adjuster part of the combo removed and run them at 100% with no problems.
I do a lot of empty freeway driving and am looking to increase the mileage. I do not want to ruin the injectors or hurt the truck. Anyone else have any advice/opinions? Thanks, Scott
I've had my MP-8 for a little over a month now and have seen a hand calculated mileage gain of about 3 mpgs. I'm now getting around 17 mpg. I know you 5.9er's are laughing at a 6.7 bragging about 17 mpg but when I first bought this truck it was getting around 12 mpg. I've been using my SC flashpaq on performance and Stanadyne in the fuel, they gave a few mpg too but my most noticeable gain in mpg was after the MP-8 install. Hopefully a couple more when I install the DPF delete kit. BTW whenever I race my buddies '06 5.9 w/ Edge Juice, I walk away from him every time! The MP-8 stacked w/ the SC Flashpaq really wakes this truck up.
__________________ '07.5 3500, 6.7L, AUTO, MEGACAB, 6" LIFT, 37x13.50x18 TOYO M/Ts, MP-8, AIRBAGS, MOPAR SRT HOOD, BUCKSTOP BUMPER, WARN 16.5TI, PIAAS.
"The more we sweat in peace, the less we bleed in war." COMBAT VET, SSGT-USMC
Good to hear the injectors aren't in danger according to MP-8. I wonder if they're running 100% all the time on the company trucks using their replacement "plug" or their shimmed relief valve?
I posted on another MP-8 thread here yesterday about rail pressures on my truck using their plug with the MP8 set at different levels. With the MP8 set to 100%, my max rail pressure was => than 28,500 psi WFO (and it would stay there until I got out of the throttle). Today I finally got my new relief valve and shimmed it using two of the three TS supplied shims, which was counter to the TS recommendation I got when I suggested this idea to them a few weeks ago - they said to just run all three shims. My rail pressure now tops out at about 27,000 psi at the 100% setting, so that's what I'm going to run for awhile as I feel it's safer than even higher pressures. The stock rail pressure I saw without the MP8 connected yesterday maxed out at 22,500psi, so I'm thinking it's a good compromise between what DC uses stock and what I suspect may be pushing the envelope if using all three shims.
I probably worry too much, but unless someone else is willing to pay for what I believe are roughly $2000.00/ea. injectors, I figure it's cheap insurance. I'll risk sacrificing a little performance potential for the additional peace of mind.
Of course on the other hand, I could be all wrong on this issue too.
Just got it in today, then fueled, up so don't know yet. I've typically averaged about 18 to 21 mpg hand calculated (town vs. interstate) to date running the MP8 at about 40% (the overhead reads about 2.5mpg high on average). Had been very fairly easy with the throttle 'cause 'till now as I just didn't trust using the replacement plug idea and was waiting for a new relief valve.
I did notice my overhead went from about 19mpg to 23.5 on the way back from the truck stop (about 20 miles) after fueling up once I'd installed the new valve w/two shims. I had the MP8 set to 50%, and for the first time I turned the Edge on and set it at level three. The Edge with the MP8 really woke the truck up, and looks like with them both on I should get the best of both worlds, i.e. much better gas mileage than stock and far more response and power.
been running the mp8 for 2 weeks now. Just got back from a 1400 mile trip down to south texas.....I am seeing a slight increase in mpg (not what I was looking for). The best part is how the truck is running now. it is very responsive and does not seem to have any 'dead spots' if you will. before the mp8 my best on a 380 mile run was 16.1 at 70mph..now I am seeing 16.3 at 75 mph.. not great but better. I am waiting for the code free kits to come out. my understanding is those kits provide a 4 to 6 mpg improvement.
From what i heard that TS did blow a few injectors on 5,9 a few years back. Maybe it was bad fuel, maybe TS changed there proggramming a little. Either way, i think blown injectors would be due to contanaments in the fuel with that higher pressure. I was going to order the mp8 a few weeks back but i decided to blow a nice wad with amsoil instead. oh, and the main reason was my 2 micron fuel filter so after a few more trips then i can get the mp8. maybe
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