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JMS PedalMAX Drive By Wire Throttle Enhancement Device (11-20 All)

Item 390273
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      Review & Installation Video

      Hey, everybody, I'm Justin with, and this is my detailed review of the JMS PedalMAX throttle enhancement device available for your 2011 and newer GT V6 and EcoBoost Mustang. In this video, I'll talk about some of the benefits of installing the JMS PedalMax on your S197 or your S550 Mustang and we'll touch on the install itself. And right up front, guys, I'm gonna tell you this is a plug and play job. One out of three wrenches on the difficulty meter but we will have a little bit more detail coming up later on.The JMS PedalMAX is going to appeal to the S197 and S550 owners out there looking to eliminate that annoying throttle lag that can sometimes be a little problematic with the newer drive by wire cars. Now, this thing can be used with or without your favorite custom tune and JMS even claims a little bump in low-end power and torque. But I don't want you guys to get hung up on power numbers because that's really not what the JMS is all about. So with all that said, let's take a closer look at this product.Now the days of having a cable-controlled throttle body are unfortunately a thing of the past. I'm gonna probably sound like an old guy here but I personally prefer having a cable-controlled throttle body to the newer drive by wire technology because I know the moment my foot hits the floor that throttle body will be wide open. With the newer drive by wire cars, the moment your foot hits the floor a signal gets sent to a computer, the computer tells the throttle body to open. Obviously, all this stuff happens very quickly but if you have driven the newer drive by wire cars, you probably noticed the smallest bit of lag in between shifts, especially when you're really rolling gears. And that's where the JMS comes in.Now most of the drive by wire cars are set up or pre-programmed from the factory for the masses. So this means driveability comes first, performance takes a back seat to that. Unfortunately for a lot of us Mustang owners, performance usually takes top priority and the lazy factory throttle can sometimes get in the way of that. So what the JMS is gonna do for you is monitor that throttle signal in real time from your drive by wire setup and then reprogram or remap that throttle signal giving you enhanced throttle response in the process. JMS actually claims that this is going to make the car more manageable in heavy traffic situations or stop and go type situations where stalling can be an issue. This is even gonna help modern Shelby cars which I have heard through the grapevine can be a little difficult to drive for newer owners out there. Stalling can be an issue. JMS claims this really helps out the modern Shelby owners. Again, I can't attest to that personally as I don't daily a Shelby.So the JMS is gonna monitor that throttle signal in real time from your drive by wire application, reprogram it or remap it on the fly, giving you increased throttle response in the process. JMS actually claims that this is gonna help make your car more manageable in heavy traffic situations or stop and go type situations where stalling can sometimes be an issue.Right out of the box, the JMS is gonna give you maximum effectiveness or maximum throttle response the moment you plug this thing in. Now for whatever reason, it's a little too radical for you or maybe it's a little too touchy for your driving style, you can always plug in the included the red 4-pin connector which JMS claims will desensitize this thing by about 40%. So you are still picking up a good amount of throttle response over your factory calibration but the car shouldn't be as touchy.So in essence, you're getting two standard settings with the JMS right out of the box as this product sits right here. However, if you did wanna have the ability to kinda fine-tune your throttle experience using the JMS PedalMAX check out their optional control knob here on the site for another 50 bucks. It does give you a few more settings to play with, and it does give you the ability to kinda change this stuff up on the fly. Now that's something that's not exactly easy with the JMS as it sits right now because you'd have to crawl under the dash, either plug in or unplug that 4-pin connector we just talked about. Not exactly something you can do while at a red light or while on the road. Now as far as using this thing with or without a custom tune, that's entirely up to you. But what I will say is the JMS PedalMAX here will give you some of the benefits of going with an aftermarket tune but without having to flash the car. So for you owners out there who aren't ready to pull the trigger on a tune just yet, this would be a great way to give you some of those benefits with saving you some money in the long run.On the other hand, if you did wanna piggyback this on top of one of your canned tunes that you already have or maybe even a custom tune, that's something you can totally do as well. In fact, check out some of our customer reviews if you haven't done so already. A lot of our customers have actually done this with great success. Just check those things out for yourself.As far as price or value, the JMS will set you back just south of 300 bucks which I admit isn't the cheapest modification for your S197 or S550 but it's certainly more affordable than some of your custom tuning options out there. Now sure, you're not gonna be getting the big power gains from the JMS like you would with those custom tunes but there are still certainly benefits to be had with the JMS.Moving on to the install and honestly, like I said earlier, it doesn't get much easier than this. Simple plug and play job with the JMS, maybe a few minutes from start to finish. And you really don't need a ton of tools to get this one knocked out. JMS does recommend unplugging or disconnecting your negative battery terminal first before getting started with the install. After that simply climb under the dash, remove the plug connected to the top of the gas pedal. After that simply plug in the JMS to that sensor there, plug in the factory harness to the JMS, and your install is complete. So that's my review of the JMS PedalMAX for your '11 to '17 Mustang which you can get right here at

      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • Eliminate Pedal Lag
      • Improves Vehicle Acceleration
      • Enhances Low and Mid-Range Horsepower and Torque
      • Eliminates Stalling of Manual Equipped Mustangs
      • Easy Plug & Play Installation
      • Stackable with Common Aftermarket OBD-II Programmers
      • Fits All 2011-2020 Mustangs


      Eliminates Pedal Lag. The drive by wire accelerator pedal of the 2011 to 2020 Mustang is well known for lag. If you have ever tried to speed up to merge with traffic you have most likely noticed a delay in throttle response. On older Mustangs the gas pedal was attached to a mechanical cable that ran to the throttle body or carburetor that provided instant feedback. However, on modern Mustangs the gas pedal is electronically controlled, similar to a dimmer switch, which has to send the signal to the ECU, which in turn sends the signal to the throttle body causing this momentary delay. To eliminate this annoying delay JMS created their PedalMAX Electronic Throttle Enhancement Device.

      Eliminates Stalling and Improves Power. The JMS PedalMAX will not only eliminate pedal lag, but it will also enhance throttle response, horse power and torque in the low to mid RPM range. The PedalMAX is also ideal for eliminating stalling when accelerating from a stop in manual equipped Mustangs, a notorious issue for the 2013-2014 Shelby GT500's.

      Maximum Throttle Response. Out of the box the PedalMAX Throttle Enhancer is preset to provide maximum increase in throttle response. If you find the stock setting to be to aggressive for your driving needs you can insert the supplied 4-pin RED de-sensitizing plug into the device. The RED de-sensitizing plug will reset throttle response to about 60% of the maximum setting. However, with the optional Remote Throttle Control Knob (part# BX-6999) you can adjust throttle response from zero to maximum or anywhere in between to match your specific driving style.

      Stackable. The JMS PedalMAX can be stacked or used in conjunction with other aftermarket OBD-II programmers and monitors such as: SCT, Diablosport, Hypertech, Superchips, Bully Dog, and Edge as well as JMS' own BoostMAX Performance Booster.

      Modern Electronics. The PedalMAX Drive By Wire Throttle Enhancement Device features JMS's exclusive state of the art digital technology housed in a proprietary sealed enclosure. The PedalMAX comes complete with plug and play wiring harness using OEM connectors for a quick installation.

      Easy Plug & Play Installation. The PedalMAX Throttle Enhancer simply connects to the factory stock pedal position sensor using an OEM style connector with no permanent modifications required. PedalMAX is 100% reversible making it warranty friendly.

      Application. This JMS PedalMAX Drive By Wire Throttle Enhancement Device is designed for use on all 2011-2020 Mustangs including the V6, EcoBoost, GT, BOSS, Shelby GT500 and GT350 models.

      Fitment: 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020

      JMS PX1114F

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (100+)

      Write a Review

      Ratings Summary

      4.7 out of 5 overall rating from 100+ customers

      • May 05, 2020

        5 2013 GT - DoubleD

        WOW !!!

        WOW, it's like a new car. I have been putting on getting my JMS PedalMAX for years, what a dummy right, the install was easy and the results are amazing. I was getting frustrated with my throttle lag but with this PedalMAX that is no more. Don't put off getting this product you will be impressed with it.

        Helpful (0)
      • April 29, 2020

        5 2019 GT - JDLNew2Mods


        Really “woohoo“ is all I have to say. Are you skeptical about the purchase? Don’t be, this thing is amazing! The difference in acceleration is ridiculous. Took five minutes to install and bam!

        Helpful (4)
      • April 12, 2020

        5 2016 GT - Neverquit

        Awaken Your Pony

        This was an outstanding investment. Easy install and I was taken back by the results. I baby my car and I keep my setting on 75. I did try 100 and loved it but just decided 75 was the best for my driving habits.

        Helpful (3)
      • March 18, 2020

        5 2019 GT - Juan

        MUST HAVE!!!!!

        Let me start by saying that the installation was straight forward and very easy. THIS THING IS INSANE, if you own a A10 mustang i highly recommend it. running this thing wide open @ 100 will surely make you smile. the response time is little to none i cant even feel any lag. DONT SLEEP AND PURCHASE THIS FOR YOUR STANGS.

        Helpful (3)
      • February 02, 2020

        5 2012 V6 - ChristopherS


        Easy to install. Took about 10 minutes if not hooking up with 12v wire. Noticed a difference in my cars performance right away.

        Helpful (4)
      • January 31, 2020

        5 2014 GT - Dwat

        Must have

        Really wakes up the throttle like it should be. Reacts like old school cable drive. Truly plug and play. Throw out the power cord and the control knob. Lol. Car runs like it should now.

        Helpful (3)
      • January 23, 2020

        5 2011 GT - Scottypmray

        Must have

        Really notice big difference on throttle response. I'm glad I purchased must have really come alive. Thanks jms

        Helpful (4)
      • December 28, 2019

        5 2015 GT - Jsmith

        Jms pdealmax

        I ain't going to lie I thought it wouldnt help my throttle response, but it made a world of a difference. The lag time is way more responsive, and you can set it to a comfortable setting that works for you. If you have a newer auto mustang get it well worth it.

        Helpful (4)
      • November 15, 2019

        5 2013 GT - ogonzalez442

        It will blow your mind!

        This has got to be the first upgrade that you need to make! This little module makes all the difference in the world when you step on your Mustang. It doesn't really matter what you have done to your car if you still have a pedal delay, it will take a li6bit of ti.e to take off. This gets rid of that. You may even want to dial it down a bit! Yes it makes that much of a change! Hands down, the best upgrade you can make for the money! Installation it's a breeze!

        Helpful (5)
      • October 15, 2019

        5 2013 V6 - alang51


        The pedalmax is a great add to a stock car, really wakens the car up and the change is a night and day difference.

        Helpful (4)

      Questions & Answers (24 answers)

      5 Top Rated Questions

      Will this work with a Bama tuner?

      • If you have a BAMA tuner, you will not need this item.

      Helpful (18)

      Can I install this if I have a Bama X4 Tuner?

      • Generally if you are using a handheld tuner on your Mustang then you already have an adjustment made for throttle enhancement. However, you can turn off the throttle enhancement from the tune and use this JMS PedalMax then you may experience better results. You will not find benefit out of this throttle enhancer if you already have a throttle adjustment made on the tunes your vehicle is running.

      Helpful (7)

      Would this compliment or even be necessary if you have the Ford Performance Power Pack 2 since ECU tune is included with the power pack?

      • The JMS PedalMAX Drive By Wire Throttle Enhancement Device can be used with the Ford Performance tune, allowing further adjustability of the throttle. Wile this would be a benefit, this will see greater benefits on an untuned car, since most tunes will adjust the throttle over stock.

      Helpful (5)

      Does it work well with a six speed automatic trans?

      • This will indeed work on an automatic trans.

      Helpful (2)

      this increases low end torque? so over stock it would be faster?

      • The JMS PedalMAX Drive By Wire Throttle Enhancement Device does not add any additional torque to the vehicle. However, this device changes the signal response to your vehicles accelerator which makes the vehicle deliver the power at a much faster rate.

      Helpful (1)
      10 More Questions
      Hi guys, does this need to be connected to the battery? Thanks 0 answer
      Would this give better performance than pedal commander? 1 answer
      Do you need to run a different grade fuel with this tune or is e87 ok? For mustang ecoboost 2019 1 answer
      Hi, I already have COBB Accessport tune. Is it will help me to increase throttle response? 1 answer
      Have a Lund tune can it work on top of it for better throttle response 1 answer
      Can this be stacked with the Roush Power Pak 1. A roush tech said yes but I’m curious as to whether that is correct info. 1 answer
      would Sport mode in a Performance Pack GT with Airaid cold air be a similar feel or will the JMS create even better throttle response? I notice in Sport mode the drive by wire lag is less noticeable. dw 0 answer
      this max pedal works on a gt 2018 to change the digital signal to analog for the throttlebody gt350 1 answer
      Does this product adjust engine braking response at all? I am looking for quicker and more consistent engine braking response over stock. 0 answer

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) PedalMAX Throttle Enhancer
      • (1) Plug & Play Wiring Harness
      • (1) Red De-Sensitizing Plug
      • (1) Remote Adjustable Knob
      • (4) Zip Ties
      • (1) Mini-Screwdriver
      • Installation Instructions

      Tech Specs

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