Proof that 87 Octane fuel is limiting your 3.6

[1rider]

You wont want it or need it with tuning. We can control all that within the tune without manipulating the 5 volt pedal signal like the PM does.

Thank you, that was my thought. I have to “replenish” my Jeep account, but this is something I am interested in.

Sponsored

 

[Stan H]

I've got almost 80,000 miles on my diesel. Zero issues with it. Just finished up a 3,400 trip with it. Avg 26 mpg with 37's and 3.73 oem gears.

And the fact your not short tripping it is probably why , I owned several bigger diesels and key to EGR and DPF survival was keeping that passive regeneration going . I think In the 5 yrs I owned my last diesel it never had to go into regen. I ran the fire out of it and the highway trips which were weekly aveaged at least 200 miles one way. I would take off from central WV and drive for example to Cumberland or to Gallapolis . Took several trips to Atlanta , Kentucky and Tennessee, if you short trip a diesel ypur gonna be in a world of hurt. I always ran fuel lubrication in my rigs. And as I read it the eco-diesels are no different. For that matter I run fuel additives in my Gasser . I believe in fuel additives . I do Not however believe in oil additives.

 

[Dilly’S Willy]

And the fact your not short tripping it is probably why , I owned several bigger diesels and key to EGR and DPF survival was keeping that passive regeneration going . I think In the 5 yrs I owned my last diesel it never had to go into regen. I ran the fire out of it and the highway trips which were weekly aveaged at least 200 miles one way. I would take off from central WV and drive for example to Cumberland or to Gallapolis . Took several trips to Atlanta , Kentucky and Tennessee, if you short trip a diesel ypur gonna be in a world of hurt. I always ran fuel lubrication in my rigs. And as I read it the eco-diesels are no different. For that matter I run fuel additives in my Gasser . I believe in fuel additives . I do Not however believe in oil additives.

That's why if it's a short trip, you need to romp on it a bit. Get those temps up and flow moving! Can't baby them.

 

[LouisvEarlleJT]

Begs the question - what was the design reason for the factory tune? I think understanding that would be beneficial.

Doesn't appear to be mpg's (since your tune would improve that, if I'm understanding). Temps? Certain RPM range?

I have no clue, this is just where my brain goes.

 

[bmpcamry09]

Begs the question - what was the design reason for the factory tune? I think understanding that would be beneficial.

Doesn't appear to be mpg's (since your tune would improve that, if I'm understanding). Temps? Certain RPM range?

I have no clue, this is just where my brain goes.

Factory tuning is set up to work for everyone no matter how bad your gas, your elevation, etc. It is set up to please the percentage of drivers who don’t care about throttle response, power delivery, refinement, etc all while meeting whatever rules they are regulated to. It is a catch all one size fits all tune.

Car guys and enthusiasts know there is always room for improvement. And it is usually in the same categories IE throttle response, transmission shifting, etc.

Custom tuning doesn’t re-write the wheel. It simply enhances what the factory fell short on. A good tuning company works within the established parameters of the software established by the OE, leaving important strategies like torque management and knock control in place, but enhancing them. Making the Jeep behave the way you want it. The base file will be what I, the tuner, feels like the Jeep should have run from the factory and is what I run in my personal Jeep.

The beauty of custom tuning is that you can set up things like throttle response, downshift/upshift response, cooling fan control, stop start behavior, and more exactly how you want. Something you can’t get at a dealership or service department.

 

[ChrisNLA]

I actually have an MPVI3 that I use to fool with my SS Camaro / LS swapped truck.

I'm slowly learning my own adjustments for the car. Been doing little things with the trans and engine.

Anyway - I have the important gear so I guess when I want to spend the money I'll have to look into this Jeep tune

 

[bmpcamry09]

I actually have an MPVI3 that I use to fool with my SS Camaro / LS swapped truck.

I'm slowly learning my own adjustments for the car. Been doing little things with the trans and engine.

Anyway - I have the important gear so I guess when I want to spend the money I'll have to look into this Jeep tune

Yeah buddy! MPVI3 works great still on these. All you’ll need is ECU unlock and bypass cable if you don’t already have Tazer or the like

 

[ChrisNLA]

Yeah buddy! MPVI3 works great still on these. All you’ll need is ECU unlock and bypass cable if you don’t already have Tazer or the like

I have a bypass too I use JSCAN for some odd and end things but been thinking about getting a Tazer as well. Might have this truck awhile...

 

[DAVECS2]

Be careful with how fast and wide you let the throttle body open in relation to fuel enrichment and cam timing. That one lever can quickly melt down an engine, as that creates transient response conditions faster that what the ecm can account for.

The fuel quality tuning stock is less than ideal, I completely agree! HP has remnants of GM's old multi-timing table architecture, but that is not exactly how the Jeep ECM is handling octane. There is an active Torque request model that is changing depending temp, knock, and misfire. You can adjust it to pull back on commanded torque maxes based on those levers and that actually skews air and timing simultaneously to get the best of the fuel you have.

The stock calibration is based around ULVE architecture, and works to minimise pumping losses and fuel over run. It is built to run at stoich of at all posible and close to no vacuum to eliminate pumping losses. The EGR exists to handle the excess NOX from funning lean all the time.

If you add fuel enrichment back in, you can improve many behaviors and reliability drastically. Your MPG will become your responsibility as the harder you drive the steeper that mpg penalty is, but the engine will have more on tap and will be more reliable.

Sponsored