Tuning Information and Common Questions

Information on tuning, troubleshooting and tune-related questions.

Mail Order Tuning Send In Program

Curious about how our send in tuning program works? Check out our infographic below! The process is simple and straightforward. Mail in your ECM/TCM, we’ll program it and ship it back. No relearns needed!

Crossed Oxygen Sensor Information

It is common for folks to make the mistake of crossing oxygen sensors when reinstalling during a build. We notice this a lot while reviewing datalogs our customers send in from remote tuning – in the datalog it becomes obvious to us that the oxygen sensors are not plugged in correctly. If we note this

GM MAP Sensors 1 BAR, 2 BAR, 3 BAR

Check out our handy chart below for identifying GM MAP Sensors (listed here), along with linear/offset data. If you need assistance deciding on which one to use, shoot us an email at! Click on the chart to enlarge.

For common remote tuning questions, click HERE. Otherwise, check out our video and graphic below on setting up and obtaining a datalog during our remote tuning process. Note: We do not accept wideband feedback through external ports/PIDS (i.e. 5v AC). You must either a) datalog your wideband through a Pro cable, or b) use a

Remote (Email) Tuning with HP Tuners FAQ

How does remote (email) tuning work? We offer remote tuning with HP Tuners. All files/datalogs are submitted via email, and uploaded/recorded by the end user. This is basically mail order tuning except you have the ability to send us datalogs so that we can fine tune your set up. This is an excellent route for

Electric Fan Patches

Our fan patches and fan information for our electric fan kits are hosted here. Choose the corresponding folder, right click and save the appropriate file. Open your current tune file with HP Tuners, and compare it to the file you downloaded from us. Copy ALL of the fan settings (done easily with the ‘compare ->

DOD/AFM and VVT Information

Displacement on Demand/Active Fuel Management (DOD/AFM) and Variable Valve Timing (VVT) DOD (also referred to as AFM) and VVT became options starting with Gen 4 LS motors (5.3L, 6.0L, and 6.2L). DOD/AFM disables four cylinders (1,4,6 and 7) at cruise. VVT is Variable Valve Timing. Some motors had both, some had one or the other,

Piston to Valve Clearance Calculator

Piston to Valve Clearance Calculator Click HERE – and then download “Piston to Valve Clearance Calculator.xls”   Whenever installing a new camshaft, a set of heads, or a fresh build entirely, it is critical to check piston to valve clearance.  At top dead center, at the end of the exhaust stroke and beginning of the

Idle Set Up (93 & Older)

Idle Setup (93 & Older) No aftermarket throttle body should be expected to work out of the box. Also, if you have a large cam and/or more displacement you should pay close attention.  All GM vehicles in our focus use what is called a IAC motor.  This motor controls a air bypass in the throttle

Electric Fan Patches

Electric Fan Patches Purchasing one of our LS1, C6, or SPAL electric fan kits? You will need to have your PCM patched in order to operate them. The patch can be done by anyone with HPtuners tuning software. Start by visiting our fan patch link here to download the appropriate file. Compare your file to

Available Tuning Programs

Send In/Exchange Options and Core Refunds For Tuning Send In Program As the name implies, you send in your PCM to PCM of NC (How do I do that? click HERE). The vehicle will not be drivable during this period of time. Sent-in PCMs are our first priority, and are typically shipped back out the

OBDII Datalogging with HP Tuners

If you need to submit an HP Tuners Datalog to us, please download our channels list here: PCM of NC HPT Channels List RIGHT CLICK, “SAVE LINK AS”! Please see our video below detailing how to set up the log so that we may use your data. Please note, we only accept ONE log at a