Using a map designed for high octane with low octane fuels can result in damage to the motor. Higher octane fuels support more ignition timing, higher boost levels, and leaner air-to-fuel mixtures compared to lower octane. Take a moment to compare and contrast timing, boost, and ignition tables from each type of calibration. This difference in fuel will determine how the car is tuned. Higher octane ratings indicate higher quality fuel that burns more slowly and can support higher cylinder pressure. Note that COBB Tuning offers calibrations for three different fuels: 93 octane (98 RON), 91 octane (95 RON), and ACN91 (91 octane from Arizona, California, or Nevada). This major difference in configuration impacts the pumping efficiency of the motor and critically impacts all major aspects of tuning (boost, fuel, and ignition). The Stage2 calibrations are designed for vehicles with an upgraded turbo-back exhaust system. The Stage1 calibrations are designed for vehicles with little to no aftermarket modifications (cat-back exhaust systems are OK). The first step in tuning an Evolution X or Lancer Ralliart is choosing a COBB Tuning Off-The-Shelf (OTS) calibration that most closely matches the mechanical components and modifications of the vehicle to be tuned. Step 1 – What is the mechanical configuration of the vehicle?
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