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 tuner opens a calibration from a vehicle he has previously tuned that had similar engine specs and uses it as a template for the new calibration. The PCM switches to an equivalent low-octane spark table when knock is present. The actual spark advance is based on other spark tables and parameters that take into consideration engine operating conditions such as coolant temperature and intake air temperature.
At best, the new calibration runs your engine as well as it did the previously tuned engine. However, because it is uncommon for one modified engine to be the same as the next, the new calibration may only serve to start the engine so the vehicle can be loaded on a trailer and taken to a local dyno tuning facility for final calibration work.
Expect to have the dyno shop make final calibration changes using feedback from a wide-band oxygen O2 sensor and real-time data from a quality scan tool.
While a Gen III PCM calibration has thousands of tables and parameters, tuning software exposes only a portion of these tables and parameters.
The hidden tables and parameters are not necessary for engine conversions. The PCM determines spark advance by adding, subtracting, or multiplying values with the main spark tables. The software goes through a series of checks to identify an attached interface cable and determine the readiness of the PCM. An update is used to make calibration changes only. If the operating system OS must be changed for example throttle type or transmission type , a full flash is required.
EFILive supports nitrous calibration through the activation of an arming switch. When the PCM sees the arming signal, it is ready to apply spark and fuel delivery multipliers when certain parameters such as throttle position are met.
Because the PCM service number GM is the same for both vehicles, the calibration can be interchanged.
A tuner can simply begin with a calibration file pulled from a Corvette PCM, make necessary changes, and then perform a full flash into any PCM with a matching service number. EFILive offers free custom operating system OS upgrades for features such as nitrous control and 3-bar forced induction support.
Before making changes in tuning software, you should first monitor real-time data while the vehicle is running so the changes are based on actual operating conditions. Some tuning software packages include data acquisition software.
Without the Boost VE table, tuning for a turbo or supercharged engine becomes difficult. EFILive Scan software allows for customizable maps for logging data. These maps display data in columns, rows, and cells. To build a map, PID choices are available for rows, columns, and cells. To focus on an issue, the table resolution may be defined for both rows and columns. PID values are shown in real-time and stored, per session, as minimums, maximums, and averages.
Parameter names such as SAE. Bi-directional controls are useful in many situations. As an example, when preparing to start an engine for the first time, it is helpful to know your fuel pump is generating the required system pressure with no leaks in the fuel lines.
By toggling the fuel pump on while the engine is not running, you can safely check for any leaks. The data communication between a laptop and the vehicle is processed through a hardware interface. Custom tuning software packages include an interface cable that is not interchangeable with other tuning packages.
EFILive bundles a high-end interface cable that features an LCD display and keypad for data functions such as black box logging and diagnostic trouble code retrieval. Although not all interface cables feature an LCD display, most include inputs for adding data from external sensors such as a wide-band O2 or thermocouple.
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