Tuning any late-model performance vehicle is going to require some sort of setup capable of interfacing with the electronic powertrain control system. Typically, these systems consist of a communication module, connection cables, and a tuning program. Custom tunes are flashed into controllers through either an ALDL/OBD connection or though a special benchtop harness. Non-flash controller vehicles (aka 'chip' cars) will use an eraser and burner, rather than the module-but the process is similar. During the past decade or so, the market for electronic tuning tools has burst wide open with options.
A varying degree of systems exist to satisfy different budgets and levels of desired tuning complexity. Unless you're burning chips, practically all flash-based tuning systems nowadays require pay-per-vehicle licensing. These electronic tuning systems are an invaluable tuning tool quite simply because without them you really couldn't tune anything. Even adjustments in fuel pressure would eventually be cancelled out by fuel trims.
Powertrain controllers are simply lookup tables or algorithm calculators-like any computer, they couldn't function (generate sensible outputs) without receiving operational data (input) from the sensors guiding them. Understanding how these inputs are used by the controller to generate the appropriate outputs is critical, yet often very complex. Scanners, which read and report sensor data (inputs) and operational commands (outputs like spark advance) in real-time, enable tuners to watch and learn how these inputs and outputs are interacting. The instantaneous sensor readings (inputs) at any moment can be used to locate the corresponding point in the tuning maps (output command source).
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