How to get 20mpg+ on 37’s/ECU basics 5/5 up @ 60-70mph with V6 3.6L

[RangerG]

Ok. People asked for it, so here it is. Ill update this thread and first post with 5 parts on understanding ECU basics.

This is a PRIMER on understanding ecu functions and fuel trim; not the whole gospel. I am NOT writing ecu code anymore, so I am not the guy to ask about specific table/programming questions. This is so the general forum members can understand the basics of how this stuff works and how to be a more informed consumer. This will apply to vehicles using narrowband O2 sensors and running pump gas.

Understanding this can help our approach to modifications to get better power, drivability, and efficiency; and how i got 23.4mpg on 37’s.

Intake is mopar 77072433; but any well designed intake will work. The key here isnt the exact parts used, but rather the approach. So pick the tuner, exhaust, and airbox that fits your needs.

As reference: AFR vs peak Torque. This is for people under the assumption that running leaner makes more power. If you know thats not true, you can skip.



Part 1/5


Part 2/5


Part 3/5


Part 4/5


Part 5/5

Ok. People asked for it, so here it is. Ill update this thread and first post with 5 parts on understanding ECU basics.

This is a PRIMER on understanding ecu functions and fuel trim; not the whole gospel. I am NOT writing ecu code anymore, so I am not the guy to ask about specific table/programming questions. This is so the general forum members can understand the basics of how this stuff works and how to be a more informed consumer. This will apply to vehicles using narrowband O2 sensors and running pump gas.

Understanding this can help our approach to modifications to get better power, drivability, and efficiency; and how i got 23.4mpg on 37’s.

Intake is mopar 77072433; but any well designed intake will work. The key here isnt the exact parts used, but rather the approach. So pick the tuner, exhaust, and airbox that fits your needs.

As reference: AFR vs peak Torque. This is for people under the assumption that running leaner makes more power. If you know thats not true, you can skip.



Part 1/5


Part 2/5


Part 3/5


Part 4/5


Part 5/5

great information you gave me. I am new to this type of tuning. I’m running 35 and getting 16 mpg. (2020 gladiator rubicon)Would like the better gas mileage. If you would be so kind as to layout all the parts I need to make this work, I would be in you debt. And what tune would be used for this

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[Sara/AWE]

@KurtP Did you get the loop delete mid pipe from AWE? I’m wondering what impact positive or negative that piece contributes.

The Loop Replacement Pipe is necessary for larger lifts to provide clearance for suspension components. Check with your aftermarket suspension MFG as it wasn't required for our JT build.
AWE Loop Replacement Pipe for Jeep JT/JL/JLU 3.6L
(SKU: 3220-11001)

 

[MHulsey91]

great information you gave me. I am new to this type of tuning. I’m running 35 and getting 16 mpg. (2020 gladiator rubicon)Would like the better gas mileage. If you would be so kind as to layout all the parts I need to make this work, I would be in you debt. And what tune would be used for this

He's running the Mopar CAI, Superchips Pulsar, And AWE Exhaust.
Only reason he went with the Mopar CAI is so he can run a snorkel. I think he has a improved airflow filter as well.

 

[FR33DOM]

The Loop Replacement Pipe is necessary for larger lifts to provide clearance for suspension components. Check with your aftermarket suspension MFG as it wasn't required for our JT build.
AWE Loop Replacement Pipe for Jeep JT/JL/JLU 3.6L
(SKU: 3220-11001)

Thanks for the reply - Regardless of suspension is there any performance gain or loss you tested with the loop delete pipe?

 

[RangerG]

He's running the Mopar CAI, Superchips Pulsar, And AWE Exhaust.
Only reason he went with the Mopar CAI is so he can run a snorkel. I think he has a improved airflow filter as well.

Is there something I should know about the super chip? Do you know if this will void my warranty?

 

[KurtP]

Is there something I should know about the super chip? Do you know if this will void my warranty?

Id recommend you leave your truck stock. ?

 

[Sara/AWE]

Thanks for the reply - Regardless of suspension is there any performance gain or loss you tested with the loop delete pipe?

As far as I've been told, there is none. The loop is there to create equal lengths for the headers so I would imagine the biggest impact would be on tone. If there was a performance gain, it would be marginal.

 

[FR33DOM]

As far as I've been told, there is none. The loop is there to create equal lengths for the headers so I would imagine the biggest impact would be on tone. If there was a performance gain, it would be marginal.

Thanks. So far I haven’t seen anyone dyno a loop delete or mpg test. I guess I’d be most worried about any loss. If marginal gains then I probably won’t mess with mine till I squish mine on a rock someday

 

[steffen707]

Understanding this can help our approach to modifications to get better power, drivability, and efficiency; and how i got 23.4mpg on 37’s.

FML, i've averaged 12.5mpg over 13,000 on my Sport S with 33" tires.

 

[MadMojave]

Hi @KurtP, do you think the snorkel will push more air into CAI resulting more HP or this is irrelevant? Your main purpose is more clearance and water protection or there is something else?
Are you cutting the hood of your Mojave or are you wondering to use the Rugged Ridge snorkel (or similar) that seems to work with the Mopar CAI without apparently major cutting? I personally wouldn’t have enough cold blood to cut the beauty of Mojave hood.
Other thing... Seems to me, snorkel is more susceptible to rain water compared to stock system. Snorkel will work really well if you are getting deep in the swamp, flooding or trails with water.
I’m very curious about your thoughts and why you decide for it.

 

[shrinkhead]

really cool stuff. makes me wonder why they didn't apply some of your findings when designing the JT. Better fuel economy is something FCA would have loved. So what's the downside?

 

[KurtP]

really cool stuff. makes me wonder why they didn't apply some of your findings when designing the JT. Better fuel economy is something FCA would have loved. So what's the downside?

I cant speak for the why. I just know marketing gets their say in advertised hp/tq numbers; and engineers are under more constraints than just power and economy. They didnt want it to be too loud. They wanted it to run on 87, not premium. they werent permitted to run richer than 14.7 for most of the operation cycle. Etc etc etc

My assumption is that because of the poor fueling it had to be depowered to keep heat in check during high load and towing. But thats just my guess.

 

[KurtP]

Hi @KurtP, do you think the snorkel will push more air into CAI resulting more HP or this is irrelevant? Your main purpose is more clearance and water protection or there is something else?
Are you cutting the hood of your Mojave or are you wondering to use the Rugged Ridge snorkel (or similar) that seems to work with the Mopar CAI without apparently major cutting? I personally wouldn’t have enough cold blood to cut the beauty of Mojave hood.
Other thing... Seems to me, snorkel is more susceptible to rain water compared to stock system. Snorkel will work really well if you are getting deep in the swamp, flooding or trails with water.
I’m very curious about your thoughts and why you decide for it.

Im doing the ARB safari snorkel. Theyve been proven in other applications not to lose power(and sometimes make a slight bump) and they design their tube well. Ive yet to be impressed with the quality of rr stuff personally. I also dont want the underhood tube to interfere with the pending dual battery set up. I also question that their tube design wouldnt cost horsepower; but to be clear thats my guess and nothing ive tested.


But reasoning for a snorkel is purely to get the intake above the dust line driving in line with other trucks. They arent more susceptible to water, less so. And much less so with dust.

The hood IS beautiful, but form must follow function. That said, ill probably meet in the middle and pay a shop that has hands more comfortable with cutting metal vice the hack job id likely do. Hahahaj

 

[Mac Attack]

Im doing the ARB safari snorkel. Theyve been proven in other applications not to lose power(and sometimes make a slight bump) and they design their tube well. Ive yet to be impressed with the quality of rr stuff personally. I also dont want the underhood tube to interfere with the pending dual battery set up. I also question that their tube design wouldnt cost horsepower; but to be clear thats my guess and nothing ive tested.


But reasoning for a snorkel is purely to get the intake above the dust line driving in line with other trucks. They arent more susceptible to water, less so. And much less so with dust.

The hood IS beautiful, but form must follow function. That said, ill probably meet in the middle and pay a shop that has hands more comfortable with cutting metal vice the hack job id likely do. Hahahaj

Great informative videos, Kurt. My given name is Kurt, also. Would the theories/mods you provided be just as applicable to the 3.0 Diesel? That is my engine of choice...for mileage/range. BTW, 10th GP early 80's, 5th GP late 80's til after DS/DS.

 

[KurtP]

Great informative videos, Kurt. My given name is Kurt, also. Would the theories/mods you provided be just as applicable to the 3.0 Diesel? That is my engine of choice...for mileage/range. BTW, 10th GP early 80's, 5th GP late 80's til after DS/DS.

Nice brother.

So, with diesel, it sort of applies. The times i have bought turbo diesels the first thing i do is tune it. Without a proper tune on a modern diesel, the egr will crap everything up very quickly. You want to get those things burning really efficiently. My tuned 2500 6.7L cummins got better mileage than my jeep. I got as high as 30mpg from it once.

If you go diesel, tune it right away. Intake will probably make power at that point too. I personally dont mess with diesel exhausts because i havent seen the gains without illegally modifying emissions equipment. A tuned one with intake is making so much damn torque and running so efficient, it isnt really needed. Hot tunes burn real clean too. In over 2 yrs of tuned use, my cummins never once had to do a regen cycle.

I love diesel.

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