Which Mustang Tuner Best Suits My Build?

What Is a Tuner And Why Do I Need One?

Most modern cars are designed to strike a balance between providing power and performance and offering a fuel efficient engine. Even when we consider the performance car segment, the vast majority of vehicles are tuned to match this balance. Also consider the fact that the Corporate Average Fuel Economy (CAFE) regulations place some limits on manufacturers, leaving untapped power potential inside most high-performance cars on the market, including the Ford Mustang.

When it comes to your Mustang’s performance, you want to unlock the true potential of your pony car, and perhaps you have already performed some modifications to your intake system, exhaust, or EcoBoost turbo setup.

No matter what upgrades you have already performed, engine tuning is an absolutely essential next step. Getting the best tune for your Mustang will not only extract the maximum performance gains from your new parts but also help ensure that your engine and its components are operating safely within the new tolerances that your modifications create.

An internal combustion engine runs off three main components: Air, spark, and fuel. Any change in the way the engine cylinders receive air and fuel will require a modification to the instructions the injectors receive from the engine computer. Your Mustang’s stock ECU (Engine Control Unit) was programmed with instructions for all of the various parts of your engine involved in delivering air and fuel to the cylinders. If you change any of these parts, you must replace the instructions the ECU is sending. The best way to accomplish this is by providing the ECU with a new program. Replacing the ECU completely is also an option, though it is a costly one and you'll need to know your Mustang's ECU code.

Even if you haven’t upgraded any parts on your Mustang, your stock setup can still benefit from a new tune. Modifying your air-fuel ratio, ignition timing and other parameters can help you change the values in that performance/fuel efficiency equation, either cranking out a few more HPs or adding more fuel efficiency.

What Kind Of Tuner Does My Mustang Require?

Over the years, technology has drastically changed the way Ford Mustangs operate. Everything from anti-lock brakes and paddle shifters to side curtain airbags and SYNC voice-activated infotainment. These technological changes include the way in which an ECU tuner communicates with your Mustang.

SCT Chip for 1989-2004 Mustangs: Beginning in 1989 with the Fox Body Mustang, Ford replaced the old speed density computer system with a mass air system. This particular change lowered power output a bit but made Mustangs much easier to modify. Fitting 1989-2004 Mustangs, the SCT Chip is the oldest and most dated way to tune your car, but this method is tried and true.

SCT X4 for 1996-2022 Mustangs: Starting in 1996, the Mustang switched over from a pushrod 5.0L V8 engine over to a modular 4.6L engine. After this change, SCT was able to release a handheld tuner, the SCT X4 for 1996-2014 Mustangs. With this unit, you’re able to view and edit some parameters along with datalog your engine’s output. What is a datalog? Data Logging is essentially recording various readings from your Mustang’s engine while the vehicle is in motion. Tuners can read this datalog and adjust your tune accordingly, send a revision to the Mustang’s ECU. The SCT X4 Mustang tuner is also available for 2015-2022 models.

COBB Accessport for 2015-2016 EcoBoost Mustangs: For Mustang models with turbocharged engines from the factory, such as the S550 Mustang EcoBoost, there is a new option on the table for you in the form of the COBB Accessport V3. Very similar to the SCT X4, this Accessport comes from the land of Subarus and other rally-inspired turbo-charged four-cylinder cars. Just like the X4, the V3 comes with preloaded tunes made to work with certain modifications that are also available from COBB. Since the release of the new 2.3L EcoBoost platform to the S550 Mustang in 2015, COBB has expanded to the Mustang crowd, offering a wide selection of high-quality Mustang parts for your turbo-fed four-cylinder engine with everything from Cold Air Intakes to Exhaust Systems, Intercoolers and other power adding mods.

S650 Mustang (2024-present): In case you are interested in adding power through aftermarket parts, It is unclear at this time whether the S650 ECU can be tuned.

Strategy Tunes vs Custom Tunes

Strategy tunes are known as the “box” or “over the shelf” tunes that initially come with the tuning device. These tunes are the files that are preloaded on your SCT X4 or Cobb Accessport device right out of the box. They’re very basic and change some parameters in your ECU enabling your Mustang to reap some of the benefits of your basic bolt-ons such as a cold air intake or axle-back exhaust. Strategy tunes are more than adequate for a stock or a lightly modified setup. They emphasize the ease of implementation for beginners and simple modifications at the expense of comprehensive control over your car’s computer systems.

There are couple main differences when it comes to strategy tunes versus custom tunes:

• Strategy Tunes: A strategy tune is great for those Mustang owners who are looking to get the most out of their basic bolt-ons, but nothing further than that. When you pass the threshold of 'basic bolt-ons', it'll be time to seek out a custom tune.
• Custom Tunes: In all honesty, you can get a custom tune from the get-go, but most like to use the strategy or off-the-shelf tunes before seeking out a custom tune due to the additional funds needed for a custom tune. If you decide to add extra modifications to your Mustang, most shops will charge for tune revisions. The best course of action for those who are past the basic bolt-on period is to gather up your additional modifications, install them and get a tune to support those modifications. Otherwise, numerous custom tune revisions can get quite expensive.

In general, you’d need to have a custom tune created when you outgrow the “box” tune that came on your tuning device. For example, if you drive a basic bolt-on 2011-2014 Mustang GT and you’re ready to install a Boss 302 Intake Manifold or add a supercharger to the mix, it may be time to invest in a custom tune so your Mustang is running and performing at peak efficiency.

In order to create a custom tune you’ll need to use a computer to create a file with custom tuning parameters and then load it onto the tuning device, rather than using the tuner to manipulate the variables one at a time. We recommend contacting a local tuner or performance shop for help creating a custom tune for your specific Mustang build. Once the custom tune is created by your local shop, you can upload that tune to your Mustang using your handheld device.

Another custom tuning option if you’re in a 2011+ Mustang or 2007-2014 GT500 is to pick up an nGauge tuner from Lund Racing. Once purchased, Lund Racing will create and cater a completely custom tune for your specific build. Supporting aftermarket forced induction setups, nitrous, E85 and other modifications, Lund Racing is a great alternative to an expensive dyno tuner.

Taking Your Mustang In For Routine Maintenance?

Unless you have a heavily-modified Mustang, we suggest using your tuner to return your car to stock before you take it in to a dealer for service. If their routine service checklist includes updating the PCM, this will likely cause the tuner to lock out, as it will no longer recognize your Mustang’s tune as the most recent version. If it’s not possible or is extremely inconvenient to return your car to its stock tune, be sure to communicate with the service department so they don’t lock you out.

Supporting Mods and Other Important Notes

When you are planning your build-out, consider the effect that each modification has on the entire package. We are discussing modifications to your car’s engine, but make sure your suspension, transmission and rear end can handle the increase in power. If you are just implementing a simple out-of-the-box tune, you’ll be fine.

As your hunger for horsepower grows, though, make sure you budget for the other improvements and supporting mods, which will help hold your car together. An extra hundred horsepower won’t do much good if it twists your chassis and driveline, or burns up your clutch the first time you unleash it.

• Suspension: Springs, Control Arms, Bushings, etc.
• Tires: For better grip. Remember, spinning isn't winning!
• Driveline: Aluminum or Carbon Fiber Driveshafts, Stiffer half-shafts, etc.

You’ll also want to look at your wheels and tires. Can they put the extra power down? The factory all-season tires won’t cut it on a supercharged motor with 600 horsepower. And, if you are taking your Mustang to the track or the drag strip, generic summer tires may not provide enough grip to control all those extra horses coming out of your car.

CJ’s Gotta Have It Race running NMRA in 2012

The octane of your fuel is another important factor to keep in mind. You’ll notice on some of the more basic handheld tuners that they have generic tunes for different fuel octanes. Because of the characteristics of gasoline and its various octane ratings, make sure you are using the correct gas for your tune.

Keep in mind that using 93 octane for a tune that supports 87 octane is technically okay in most situations, however, using 87 on a tune that’s meant for 93 is a recipe for engine knock and other serious internal issues. Remember, when custom tuning a vehicle, the higher octane you use, the more power you’ll be able to create.

For example, you could see an increase of 35 hp and 40 ft-lbs of torque on a 93 octane tune, whereas with an 87 octane tune, those numbers could only be 20 and 25 respectively.

While Ford’s EcoBoost engines are designed to handle lower octane gas on the factory tune, the ECU will detune itself to accommodate the lower octane. Figures for a 2.3L EcoBoost engine using 87 octane have the Mustang’s turbo reducing power from 310 HP to 275, and torque from 320 lb-ft to 300. Making sure the octane that goes into your tank matches the tune of your ECU will help keep your engine running smoothly.

The Ever-Popular Question: Will a Tune Void My Warranty?

The most important tool in your toolbox, as is the case with any big project you undertake with your Mustang, is a healthy knowledge of your limitations and a bit of common sense. Mustang tuners are designed to modify the operation of the most delicate and explosive (literally) components of your Mustang and its engine. The potential for catastrophic damage is real, and it could happen without warning. While the use of aftermarket parts in and of itself can’t void your warranty, if you cause damage to your engine by making changes it couldn’t handle, your next maintenance trip likely won’t be covered by the warranty. Furthermore, if something were to happen to your engine and you uninstall the tuner from your Mustang, the dealer will still likely know that there was an aftermarket tune on your car on more recent model year Mustangs.

So how does it all work? Well, in order to initiate a warranty claim, the service provider (usually the dealer’s service department) must prove that the failure was the result of a manufacturing defect. Dealerships handle these issues all the time, and the process is generally straightforward.

So what if you have installed aftermarket parts? It all comes down to what caused the failure that has brought your car into the shop. If it could be argued that these parts caused the failure, the dealer will likely make that case. If your parts have nothing to do with the issue in question, the dealer isn’t allowed to reject your warranty claim because you have aftermarket components on your car.

Therefore, the bottom line is that no, your warranty is not automatically voided as soon as you implement one of these tuning solutions or any other aftermarket parts, for that matter. If the dealer can make the case that your modifications, and not a manufacturing defect, were the cause of the issue, though, they can reject the warranty claim and hand you the full repair bill.

For more information on this topic, the FTC has a great page explaining their ruling on the subject.

Summary

Tuners help you to unlock your car’s hidden potential. If you’re just looking to modify your car with a few basic bolt-ons, then a strategy tune should be enough for you. Custom tunes are more expensive, and many Mustang enthusiasts like to wait until they’ve finished their build due to the cost of tune revisions that may be necessary with additional modifications. On the other hand, some modifications, like improving your suspension and tires, will make sure that your Mustang is ready for the additional power that you'll likely see after a tune.

Though tuner damage won't be covered by your warranty, installing aftermarket parts, including tuners, doesn't void your warranty automatically. You should use your tuner to return your Mustang to stock before taking it to a dealer for service though because your tuner could accidentally lock you out of your Mustang’s ECU.

• The SCT X4 is a handheld tuner available for both 1996-2014 Mustangs and 2015-2020 Mustangs.
• If you have a turbocharged engine, like an 2015-2020 EcoBoost, then a Cobb Accessport may be the option for you.

Header Image Credit: OPI Images