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Boost

Basic settings

Basic solenoid position

The table defines the solenoid position to achieve the target boost pressure depending on the engine speed.

Target boost

The table sets the desired boost pressure depending on the engine speed.

Pressure at 0%

The pressure generated by the turbine when the solenoid is off. This value is necessary for the additional settings to work correctly.

Solenoid operating range

In the extreme positions (near 0% and near 100%), the solenoid does not work. This feature allows you to limit the solenoid control range to its operating values.

Additional wastegate settings

Open below 100 kPa

This feature allows you to open the solenoid at pressures below 100 kPa to improve cylinder cleaning and reduce EGT.

Close if boost below target

If the actual boost pressure is lower than the target by a specified percentage, the wastegate control is held at 100%, i.e., the wastegate is completely closed for faster pressure build-up.

Closed wastegate VE correction

When the wastegate is fully closed, cylinder filling deteriorates. To compensate for the error in calculations, a filling correction can be set.

Closed wastegate Ignition correction

When the wastegate is fully closed, back pressure in the exhaust system increases. This makes it harder for hot exhaust gases to leave the cylinder, causing it to overheat and increasing the risk of detonation. To reduce this risk, ignition retardation is adjusted—the advance angle is reduced.

TPS pressure limitation

Reduces the target boost pressure when the accelerator pedal is partially depressed. This improves drivability in city driving and provides smoother engine response and more precise traction control.

IAT correction

IAT base position correction

When the air temperature changes, its density changes. Therefore, the base position must be adjusted to achieve the target pressure.

IAT pressure limit

Reduces the target boost pressure if the intake air temperature becomes too high to protect the engine from overheating or detonation.

Gear correction

Gear base position correction

Adds a value to the solenoid base position depending on the gear. Used for fine-tuning large turbines when automatic control is not effective enough.

Gear target pressure limitation

Allows you to reduce the target boost pressure in certain gears to improve traction or protect the transmission.

Back Pressure

If an exhaust manifold pressure sensor is installed, this function opens the solenoid to prevent the back pressure from exceeding the set level.

How to adjust boost

For accurate boost adjustment, perform the steps in high gears, preferably while driving uphill, to allow sufficient time to reach maximum boost pressure.

Initial settings:

  • Set the PID controller value to 0.

  • Turn off all Advanced settings

  • Determine the solenoid's operating range. To do this, turn on manual PWM control mode and change the value until you find the minimum and maximum values at which the solenoid stops clicking. These limits will be the operating range.

  • Determine the boost pressure at 0. To do this, turn off the boost solenoid, accelerate in second or third gear, and note the maximum pressure developed by the turbine.

Target pressure settings:

  • Fill in the target boost pressure table depending on the engine speed. Fill in realistic values that the turbine can actually produce.

  • Gradually add values to the solenoid's base position so that when the accelerator pedal is fully depressed, the boost pressure matches the target.

  • Proceed to the next step when you are sure that the boost pressure does not exceed the target pressure in different operating modes.

Additional westgate settings:

  • Set the filling and ignition corrections to 0.

  • Set Close if the boost is 50% below the target. Gradually decrease the value until you achieve the fastest boost without exceeding the pressure.

PID controller settings:

  • Increase the Kr (proportional) coefficient. If fluctuations or blow-through occur, halve the value.

  • Increase the Ki coefficient (integral). If fluctuations or overblowing occur, reduce the value by half.

  • Increase the Kd coefficient (differential). If fluctuations or overblowing occur, reduce the value by half.

Performance check:

  • Test the boost controller under different conditions (different gears, loads). If necessary, reduce the PID coefficients for stability.