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Gmc Diagnostic Software Free3/30/2021
For example, if the STrim is four and the LTrim is seven, the PCM is adding 11 percent more fuel to maintain the target airfuel ratio.There are several Internet articles that discuss this tuning in far more detail than can possibly be provided here.There are many aftermarket hand-held programmers that enable the installation of generic performance tuning and change some simple operating parameters (tire size, gear ratio, fan temperature, etc.).
But for about the same price, you can obtain a package that enables your own custom tuning for more power and alteration of operational parameters far beyond the capabilities of the hand-held programmer. In essence, these packages provide you with the ultimate control of your vehicles powertrain control module (PCM).Understand that you do this at your own risk. If the programming is done incorrectly you can impact emissions (perhaps violating local emissions laws), do serious damage to your engine, and possibly harm yourself and bystanders. The author consulted with a pro (Bryan Herter of PCM For Less) before attempting any of the programming. For engine control, the PCM takes many sensor inputs (O2, TPS, RPM, MAF, MAP, etc.) and calculates the target outputs (primarily spark advance and fuel-injector-duty cycle).Well be using HP Tuners VCM Suite Pro for our OBD-II PCM programming. VCM Suite Pro is designed for the home enthusiast, as well as the professional tuner. Gmc Diagnostic Software Upgrade That AllowsHP Tuners also offers an Enhanced IO upgrade that allows you to log your own wideband oxygen sensor along with your vehicles other OBD-II data, for example. The product is easy-to-use and has many powerful features consisting of three primary utilities: VCM Scanner (OBD-II diagnostic scanner), VCM Editor (PCM editor), and VCM Flash (to read and program your PCM). HP Tuners software allows you to change the entries of your PCMs tables to improve the performance of your vehicle. In this article well focus on changing your wide-open throttle (WOT) performance to avoid any changes to the vehicles emissions during part-throttle. The HP software runs on a 300 MHz-and-faster laptop with at least 64 MB of RAM and a serial-port connection. The PCM contains various switches, constants, and tables that control operation of the engine, transmission, and other aspects of the powertrain. Also, read the entire help file that comes with HP Tuners because it provides a thorough tuning overview.First, open the PCM file in VCM Editor. Under the Edit menu youll see choices for Engine (these are your engines operating parameters), Engine Diagnostics (this is where you can change how your PCM handles engine problems), Transmission (these are your A4, M6, and torque man-agement parameters), Transmission Diagnostics System (where you set fan operating temperatures, VATS control, and AC parameters), and Speedometer (where you set tire size, gear ratio, and speed limiters). It is preferable that you perform tuning in the order of these parts. To maximize the power increase, youll need to use premium gas to minimize knock. Always save your progression of work so you can review it if you have to and keep notes on the changes you make. General Fuel System Adjustment Even though we are going to tune at WOT, we need to do some part-throttle tweaking. Your PCMs fuel system control relies on the pre-cat oxygen sensors to adjust the part-throttle airfuel ratio to 14.7:1-15:1 for low emissions and fuel economy. The PCM adjusts the fuel-injector pulses based on the values (fuel trims) it has learned. There are two types of fuel trims: LTrim or LTFT (long-term fuel trim) and STrim or STFT (short-term fuel trim). The engine is divided in half, and there are trims for both sides of it referred to as bank 1 and bank 2. The sum of a particular banks trims tells the amount of fuel the PCM is adding or subtracting.
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