Let's Talk Tuning

On this page, we will address the FAQ's of tuning and what to expect during the tuning process. Due to the inherent custom nature of aftermarket modifications, there will be some variance in the process. If you have any questions regarding your specific vehicle, please contact our sales team at (832) 370-0791 or sales@peitzperformancetunes.com.

What is a Tune?

A tune, otherwise known as calibration, is a file written to the computer in your vehicle that runs your engine. This control module is sometimes referred to as the Engine Control Module (ECM), Power Control Module (PCM), or Engine Control Unit (ECU). The tune tells the ECM when to fire the spark plug and how much and when to inject fuel into the cylinder. This will vary depending on the vehicle, but as a general rule, the myriad of sensors in your engine bay, attached to your wheels, and other control modules throughout your vehicle provide information to the ECM via the wiring in your vehicle. The wiring is linking sensors and control modules by a network of wires throughout your vehicle commonly referred to as the Control Area Network (CAN). For custom tuning, this file is created specifically for your vehicle. We utilize the CAN information provided to the ECM and outside sensors added to the vehicle during the tuning process to accurately gauge how the vehicle is performing and develop a customized file based on this data.

Factory Computer modifications vs Aftermarket Engine Management System?

With Electronic Fuel Controlled (EFI) engines there are seemingly endless options available for tuning solutions along with ABS controllers, traction control systems, and additional piggyback systems for your vehicle. The process of knowing what is the right choice for your vehicle can be daunting and the learning curve is only the beginning. It is often important for us to know what type of racing or events you will be competing in and what your goals are. If you want a peppy daily driver with a little extra power and some great street appeal, then the factory computer system is most likely going to be your best choice. If you have a gutted full-fledged race car that needs the most advanced traction control technology paired with custom dash options, you might want to shoot for a more advanced system that can be fully customized for your needs. 

Will a tune void my warranty?

As with any aftermarket modification, the tuning process will technically void the factory warranty related to that modification. For example, if you add a cold air intake and tune, this will void the factory warranty on the engine and associated parts. If your trunk were to stop opening the day after the tune, that should still be covered, because the engine control module does not control the trunk operation. 

How do I choose a tuning software?

Peitz Performance Tunes offers several tuning platforms including the major players in the tuning world such as HP Tuners, COBB, Holley EFI, Motech, and EFI Live. The first thing to consider is what vehicle you have and what platforms support the vehicle. The next option to consider is what kind of support the tuning software offers for your vehicle. If you opt for the cheapest option, you might not have access to every parameter (or option) available, and this can limit your or tuners’ ability to complete a safe, well-running tune. 

Can a factory Control Module lose a tune?

This question has been answered in-depth on our blog post. The short answer is no, it cannot lose a tune. Depending on the software used, you could have flashed it back to stock if a handheld device was connected to the vehicle. More than likely, there is a mechanical issue with the vehicle that has developed and this will need to be diagnosed and addressed by a qualified mechanic. 

What are the basic tuning requirements?

This has been answered in-depth on our blog post here {insert blog link]. Below we have gathered a shortlist of the most basic tuning requirements and information we will need about the vehicle.  

A way to measure AFR.

Exact size, manufacturer, and part number of the fuel injectors

Spark plug part number, heat range, and gap.

MAP Sensor (vehicle dependent)

Fuel that will be run in the vehicle; octane and ethanol percent (when applicable)

Hardware for flashing (writing) the tune file such as HP Tuners MPVI 2.0.


What is the purpose of a Dynamometer? Does the Dyno do the tuning?

A Dynamometer is a tool to a tuner, just like a torque wrench is a tool for a mechanic. A dynamometer is a tool for safely measuring horsepower and torque. There are some very advanced dynamometers that can incorporate AFR or reverse calculate engine power, and even apply real-world load to the vehicle to ensure that the vehicle will perform as well on the street as it does on the dyno. Check out our blog post [link ] here to learn more about our specific dynamometer and why we think it's the best in the business. 


Do I have to make an appointment?

For In House Tuning, appointments are required, for Remote Tunes, they are loosely scheduled, and tune files are exchanged via email, with returned files every 72 hours during the week.