This car came to us last week with a turboback exhaust, upper and lower intercooler pipes, a front mout intercooler and an intake. When tuning the EVO X, we need to pay special attention to a few different maps inside the ECU. We need to adjust things such as air fuel ratio, ignition timing, boost, and the MIVEC tables.
Adjusting the air fuel ratio (AFR) is important because if you have too much or too little fuel in the cylinder you will not get the optimum burn. Without the optimum burn of the fuel in the cylinder you will be robbing the motor of horsepower. Another thing with the AFR is safety. If we lean the car out too much (too much air, not enough fuel) we can cause the motor to detonate or knock.
When adjusting ignition timing, we are able to change when the spark plug fires in the cylinder. We can advance or retard the ignition timing to fire the spark plug to ignite the air and fuel mixture to optimize the combustion process.
Adjusting the boost through the ECU is more complex than using a manual boost controller but it gives better resolution and boost response.
MIVEC, Mitsubishi’s brand name for variable valve timing, is important to adjust because it allows us to control when the air is entering or exiting the vehicle. If we can get all the burnt air out of the cylinder before we let in the fresh air fuel mixture, we will not have that air contaminating the next burn.
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