After reviewing several ways to change tire size, gear ratios, and even transfer case ratios its time to step it up a notch. I did something similar with the JK I had and you can go back and read about that here – ECU Tuning our JK.

The plan is similar, the execution is different.

The plan with the JL is very similar to the JK. Tweak the settings to make driving it more enjoyable.

To do that I partnered with HP Tuners and will be using their MPVI2 and VCM Suite of software. The part about this I like the most is the versatility of this package. For around $400 you can get the MPVI2, the software, and as of the beginning of this month a free PCM unlock when you purchase the MPVI2.

If you decide to trade in your Jeep and buy a new Bronco when they come out you can just buy the programming credits needed, unlock the PCM when they have it unlocked, and program the next vehicle, and the next vehicle, and the next vehicle. No more buying new programmers every time you want to do something new.

The MPVI2 and software also gives you access to much more than other systems. In fact its ability to alter so many parameters can be daunting. Rest assured that HP Tuners is there to support. Offering remote tuning, a plethora of trained tuners across the US and experts to help guide you.

How?

Step one is to remove the current AEV SNAP module and set programming back to stock.

I have already downloaded the stock PCM information and sent it in for the unlock service. I sent it FedEx Ground on Friday the 5th of June and it was on its way back to me as of Monday the 8th of June.

Once it’s back in my hands I will install it, power everything up to make sure it all works and then change my gear ratio and tire size to match what’s currently installed.

The Grand Plan!

Step by step I will modify everything from fuel tables, to traction control settings. Changing torque delivery when traction control engages and tweaking the throttle pedal curve.

As changes are made I will share my thoughts, performance gains or losses, and whether the changes caused any issues. I will track the performance changes in 2 ways. My trusty G-Tech Pro and the Track Addict app from HP Tuners. Once I set a preplanned route I can repeat tests and report back results over time.

The goal is to improve power delivery making it smoother, more controllable, and not sacrificing too much efficiency to get it. I also want to smooth some of the rough edges of the factory programming. The engineers at Jeep did an excellent job but they had strict mandates on performance metrics to meet. I don’t have those constraints.

What do you want to know?

Tell me what you want to know, what you want to understand, and any ideas you think I should test. If will do my best to answer your questions along the way.

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William Connor

As the Editor, William is responsible for all the good, the bad, the ugly and the indifferent that happens at 4WAAM. William brings a wide range of experience to this role. He also wields a freely shared...

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