Tuning Information and Common Questions

Information on tuning, troubleshooting and tune-related questions.

Information on tuning, troubleshooting and tune-related questions.

DOD/AFM and VVT Information

Thursday, 24 October 2019 by

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,

Idle Set Up (93 & Older)

Wednesday, 18 July 2012 by

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

Wednesday, 22 February 2012 by

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

Thursday, 17 November 2011 by

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. 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 next day. No security relearn or CASE

OBDII Datalogging with HP Tuners

Friday, 04 November 2011 by

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

OBD1 Datalogging

Friday, 04 November 2011 by

Obtaining a Datalog Contents: OBD1 Specific Hardware Software Scanning Rules for Submitting to PCM of NC Simple Diagnostics Sensor Parameters Idle Setup   OBD1 Specific Hardware While there are many solutions on the web to scan your own car, we have grown especially fond of those sold at  Their products have offered reliable service

Dyno Tuning Read Me!

Friday, 04 November 2011 by

Looking to have your car dyno tuned or street tuned by us? Reading this may save you some time. About Dyno Testing/Tuning A dyno is basically a treadmill for a car.  It is an extremely handy tool for a good tuner because he can test the car under controlled conditions and measure power, torque, transmission

Security and CASE Relearns

Thursday, 03 November 2011 by

  If you send in your own PCM, you do not need to do a security or CASE relearn. If you install a core PCM and the vehicle does not start, you will need to do a security relearn. This occurs about 75% of the time. If you install the PCM and your vehicle does start,

Tune Troubleshooting

Sunday, 10 August 2008 by

The first step is to notify us of an issue. If you do not tell us, we cannot help you fix your problem. Our mail order tuning is based off of roughly twenty years of in-house dyno tuning, which makes our tunes very close. Occasionally, some vehicles will need more adjustment than others. If you can

Reflash Policy

Wednesday, 06 August 2008 by

If you already have a tune from us and change some parts later on, we charge a $50 (plus shipping) fee to update the tune for your modifications. The first step is to call or email us to see if your changes require a reflash. Depending on what it is, it may or may not

While each vehicle will be different, we are always aiming for more power, more gas mileage, and the best driveability possible. Gains will depend on what kind of engine you have and what modifications are done to the vehicle. For instance, a car with headers may pick up more from a tune than a stock