You can see a video of his 9 second pass on YouTube. Great driving Dave! Welcome to TunedByFrost. This site is your ticket to late model GM tuning that can come to you in Central Virginia, based out of the Richmond area. Dodge tuning will be available in Stop treating that factory engine computer like your enemy and put it to work for you.

There are many tuning solutions available that utilize the factory computer in configurations such as 1, 2, and 3 bar speed density operating systems and Real-Time Tuning RTT for certain vehicles.

There is a solution for nearly any imagineable combination and your stock engine computer. Make your vehicle drive better at cruise, wide open throttle, and everywhere in between. We offer dyno tuning in Richmond VA and much more. We are very proud of our mail order calibrations and our cost is extremely competetive. Mail order tuning can still be purchased here. You may also use our newer website EFI Performance for the same services with a newer cart system.

Read a little more about it here! It's on the way; please bear with for the time being if odds and ends cause any issues to this site. Always contact me if you have any troubles. Well, I'm just one guy and have been very busy with all of your cars. Look for a larger update coming a little later on. TunedbyFrost is proud to now sponsor the best and largest Corvette Forum on the internet!

Our new office is inside of the new Performance Auto Sport shop. See you soon! Free Shipping! Click HERE for details or purchase! Get your new SS on the dyno and get it calibrated!

Home of DIY tuning for the '411 PCM

More will be added over the next few weeks so check back. As always, please check back often for more updates!The tuning definitions for the ' PCM are now available.

These definition files cover the fuel system, spark advance, emmissions systems, engine idle control, diagnostics, and vehicle and transmission options. These can be downloaded by clicking the links that are located to the right. The PCMs supported cover the model year e. OS 's As of now, these files do not yet fully support the PCMs. The later calibration was revised to use a standard OS OSand many parameters have been moved to new locations within the binary.

It takes a lot of effort and tools to make this stuff happen. Your support will help keep this project going. Currently there are XDFs for the engine and diagnostics, but the transmission and electronic throttle still need work.

To make this happen, it takes tools like test benches, an oscilloscope, function generator, and other items that can be rather expensive. Please consider giving a donation to keep this project moving. For clarity, the donations will be going to myself dimented24x7 as the individual developer and not the host of the FTP moates.

These files allow the editing of various parameters in the PCM, such as spark, fuel, supported error codes, etc. The tuning definitions are broken down by the system the parameters are related to, such as, spark, fuel, transmission, PID diagnostics, and vehicle options.

Links to these files are available in the sidebar. For the future, there is also a tuning definition in the works that will allow scanning and datalogging through the OBD-II port once the hardware and definitions have been tested. Whats new: The tuning definitions for the ' PCM are now available.We are dedicated to tuning your vehicle's engine computer to attain maximum performance and the best drivability possible while keeping the powertrain reliable.

We don't only focus on Wide-Open-Throttle performance, we also focus on all aspects of vehicle operation aimed at making your total driving experience more rewarding. After all, a properly tuned engine is a clean running engine! While we specialize in vehicles that have engine swaps done to them, we also have a lot to offer those vehicles with bone stock engines or those with highly custom builds.

Mild to wild, practical to radical, we will do our best to get your vehicle running as it should. If you do not see your GM car listed above, please contact us to see if it is supported more support is being added every day so it is difficult to keep this list up to date.

If you do not see your GM truck listed above, please contact us to see if it is supported more support is being added every day so it is difficult to keep this list up to date.

MEFI-3 Controller part numbers:, Perform certain re-learn procedures that require the GM Tech 2 scan tool local service only. Reprogram replacement modules with factory programming some restrictions apply. Basic One-Time Mail-order tuning service click here for details. Shipping Methods please note we've recently switched to UPS as our primary shipping provider, and we no longer ship outside of the USA.

OBD-1 Multiple-program, user-selectable "thumbwheel" chips price depends on application and setup. It has recently come to our attention that some late 80's to mid 90's factory GM PROM chips installed on factory mem-cals are failing when we try to erase and reprogram them. Anyone with a PCM exc Regal must use a mem-cal adapter, no exceptions. Will not work with Cadillac 4.

For our ON-GOING custom tuning service customers: this mem-cal adapter accepts individual EPROM chips we can ship you which can be installed by you, the customer, without requiring you to ship us a mem-cal to be reprogrammed. Use of this device can save money and downtime when extensive tuning work is required. Other restrictions may apply to your specific application, ask for details. This exchange program is helpful if you can't afford any vehicle down-time.

Simple first time LSx tune with HP Tuners - Free Horsepower!

A core charge or other costs may apply.You can easily change the tune of your own LT1! For the average computer user and car enthusiast, there isn't much to it! With an initial financial investment and some time set-aside, you can get your car running great and take advantage of your mods. I have some basics and tips I've picked up as I've tuned my own Camaro Z Much of it can be applied to other vehicles as well.

This will be tailored to the LT1 engine, especially the ''95; the VE table tuning aspects will be even more helpful to ''93 and ''97 LT1s. Second, you'll need the appropriate cable connector to go from your car to a computer. Of course, you'll also need a computer to run the program! However, it does not have definition file for OBDII cars ''02so you will only be able to tune ''95s. It's important to be sure that your vehicle and engine are mechanically sound before you begin tuning.

ls1 pcm tuning

If any of these things are in poor repair, they can cause the PCM to think the engine is running one way when it is not. A good tune will never be achieved if something mechanical is in need of fixing or replacing. The PCM uses a table of cells to modify both spark timing and fueling. Where the different blocks begin and end can also be modified, with the stock tune having the vacuum blocks set at 30 32 for A4s50 and 80kPa, and the RPM blocks set at for A4sand Combining these, one can see how there will be 16 total blocks: below 30kpa, at RPM, and RPM; then the same for 30 to 50, from 50 to 80, and from 80 to kPa.

There is another modifier for both the engine load and speed boundaries called hysteresis. This affects how adjacent blocks of cells are combined when on the edge of a boundary say right at 30kPa at RPM. These grids are how the fueling is trimmed, depending on O2 sensor feedback seen in detail below under "BLMs"so how they are set can be important to getting a car running efficiently, whether you are running a MAF sensor or in speed density off the VE tables. When modifying the engine, especially with cams with more valve overlap, increased displacement, or ported heads, these will need to be adjusted accordingly.

The modded engine will tend to spend more time in different ranges than the stock engine. BLM stands for "block learn multiplier. But because the car is not running in an ideal world, there will be correction needed for differences in air temperature, density, humidity, as well as fuel octane, quality.

On top of those two big variables, there are also the changes that happen due to normal wear and tear on the engine and its sensors. By default, in closed loop, it attempts to get an air:fuel ratio AFR of General Motors produces several computer types and each is built for a specific engine group.

Some work with many engines, and some only work with one. It is very important to obtain the original computer, harness, and sensors when buying a used engine. This ensures that you have everything needed to make the swap as simple as possible.

The possibilities are almost endless. The reluctor wheel setup can be changed, but it requires the corresponding computer.

Gray sensors are 58x, and black sensors are 24x. There are two main types of computers: tooth and tooth reluctor wheel engines. The reluctor wheel is mounted to the crankshaft inside the block to the rear. The crank position sensor is mounted to the rear of the block, behind the starter.

As the crankshaft rotates, the teeth on the reluctor wheel interrupt the magnetic field created by the sensor. The sensor records these interruptions and sends a signal to the computer. These signals are used to detect issues, such as misfires and detonation, with the ignition system.

It is important to know which reluctor type you have, 24x or 58x. You can tell by looking at the reluctor wheel sensor: a black sensor is a 24x wheel, a gray sensor is for a 58x engine. The pin-outs and wiring harnesses are different. This is a Camaro ECM, front and back side. This is a 58x reluctor computer; the ancillary parts are very expensive, so make sure to get all of them from the donor car. Otherwise, you will spend a lot of money to buy these components individually.

Changing the reluctor wheel also requires changing the cam timing gear. The reluctor wheel and the cam gear work in tandem to monitor the ignition system. There are several different drive-bywire pedals. Not shown are pedals for the — Corvette, CTS-V, Trailblazer, and the rest of the trucks, which interchanged through the years.

The pedals and TAC modules are a matched set.

The Basics of LT1 Tuning

You need both units to properly operate a drive-by-wire throttle. These throttle bodies are: — Corvette top leftVortec trucks top rightdrive-by-wire assembly bottom leftand LS2 GTO bottom right.

Engines can be drive-by-cable or drive-by-wire, depending on the vehicle. The tooth reluctor wheel is found on drive-by-wire engines only. This reluctor wheel cannot be used with a drive-by-cable throttle body without modifications. If you want to run these engines with a traditional throttle cable, they need to be converted to a tooth reluctor wheel, along with a cam gear on the front of the engine and a tooth reluctor wheel computer.

Each engine uses a specific computer. If you do not have the proper computer, you can find a wide range of used LS computers from various retailers. The 24x ECMs can be programmed for either drive-by-cable or drive-by-wire. You can also convert an engine to drive-by-wire by reprogramming the original computer for drive-by-wire, but you must be able to plug the wiring harness into the particular computer.

The F-Body computers and harnesses are not compatible with up harnesses or computers because the plugs are different. Programming the stock ECM can be done several ways. Most of the aftermarket tuning modules and software are locked, meaning they lock themselves to a particular computer on the first use.

To unlock them, you must purchase pass codes or VINs for additional vehicles.Although Gen III PCMs are powerful control modules, they are of little use without tuning software tochange engine and transmission operating parameters.

You may find that the best results involve a blend of tuning services at an experienced dyno facility and final do-it-yourself tweaking using a popular scan-and-tune software package.

ls1 pcm tuning

Prior to use in a production vehicle, each GM PCM is flashed with a calibration specific for its application. Vehicle options such as air conditioning, electric fans, transmission type, throttle type, etc.

GM repair technicians use a web-based subscription service to access on-board control module calibrations. When an on-board module is replaced during service, the technician uses TIS2Web for service programming.

Occasionally, a vehicle may receive a calibration update due to an undesirable performance behavior noted by owners of similar vehicles. Service technicians have access to the latest vehicle calibrations through an online subscription-based service.

LS SWAPS: Engine Management Systems Guide

This service is limited to flashing on-board modules with the latest GM calibrations. Gen III engine conversions always require calibration changes to a GM calibration, so this service is nothing more than a first step in preparing a PCM for an engine conversion. Unfortunately, service technicians having access to this GM service are often unwilling to use it for an enthusiast because it requires the vehicle to be present for a connection to the OBD-II DLC.

The Tech2 is the scan tool used by GM repair technicians to troubleshoot, diagnose, and reprogram on-board modules.

ls1 pcm tuning

Because of its price, many owners choose an alternative tool for retrieving and clearing OBD-II codes. Photo Courtesy Keith McCord. Then the technician enters the vehicle identification number VINwhich provides a list of on-board modules available for programming. After choosing an on-board module for programming, the technician is prompted to select from among several available calibrations. The calibration data is temporarily downloaded to the local laptop or PC so that an interruption in Internet service does not interrupt programming and then the on-board module is programmed.

The Tech2 is a powerful handheld device used by GM service technicians for advanced vehicle diagnostics and programming. Note that the Mongoose cannot perform the advanced diagnostic procedures of the Tech2. Preparing a PCM for use with any engine conversion requires custom programming.

A new PCM does not contain a calibration ready for use and a PCM pulled from a used vehicle contains parameters preventing fuel delivery without satisfying vehicle antitheft system VATS requirements. Additional parameters must be changed for proper engine operation and appropriate diagnostic trouble code DTC processing and notification.

PCM calibration data tables and parameters are used to mathematically apply injector and spark timing. A misconception is that the calibration data follows engine hardware cubic inches, cylinder head specs, fuel injector size, and camshaft profile.

In reality, engine hardware influences table and parameter settings that must be adjusted by a tuner for an engine to run properly. Incorrect calibration settings result in an engine that runs poorly. Many owners choose to ship their PCM to a tuner who offers a mail-order calibration service. They typically fill out an order form with questions related to engine hardware cubic inches, cylinder head specs, fuel injector size, camshaft profile, etc and send it along with the PCM.The cries were heard from across the land:?

We want an article on tuning!? I must address some caveats before I delve into the meat of the article. I am not familiar with other software or other engine management systems. But rest assured, the general principles in the way the ECM operates are similar. So, no matter what you drive, if it's GM, you should be able to get something useful from this article. It is important to point out that tuning your own vehicle is a complex process, and if you are not comfortable with it you should seek out an expert to help you.

If done wrong, you can seriously damage your engine if you don? Further, I must note that modifying the factory tune should be for "? However, I will provide a brief overview. In general you have three unique modes of operation, open loop, closed loop, and power enrichment.

ls1 pcm tuning

Open loop is used for startup running and the PCM will remain in open loop until a specific operating temperature is reached. Based on these factors plus air temperature, the PCM makes an educated guess about the correct amount of fuel needed for engine demands.

In open loop, the primary function of the PCM is to keep the engine operating despite the fact that temps are not optimal yet. The PCM must also keep emissions as low as possible, because startup is the time of greatest emissions production. As a side bar, this is why the Air Injection Reaction pump runs only for a few minutes upon startup. In Open Loop mode, the oxygen sensors we? Thus the term "open loop. Once an appropriate operating temperature is reached, the PCM then brings the O2 sensors on line and uses them for feedback about the fuel adjustments it is making.

The O2s complete the feedback loop, thus it is called Closed Loop operation. In Closed Loop, the PCM takes dozens of readings from the O2 sensors each second and uses that data to fine-tune the amount of open time the injectors are on.

In other words, it is the most complete burning i. The adjustments from the PCM are not just thrown away however. The adjustments are fed into a storage system that is used for future reference. Each "bank", or side of the engine has one oxygen sensor in OBDII there are two per side, on in front of the catalytic converter which is used for fuel adjustments, and one behind the converter, which is simply used to verify the cat is there and is working.

Each bank also, therefore, has its own STFT and LTFT values and the PCM can adjust injector pulse width simply the amount of time the injector is open each engine revolution independently on each side.