The Boost Control function is used to regulate boost pressure by controlling the duty of a boost control solenoid. This in turn regulates the air pressure supplied to the wastegate diaphragm.
Note: Due to the large number of pressure units, all default values are quoted in the default unit of kPa.
This is the typical setup found on cars which are turbocharged from factory, as well as most after-market turbo suppliers
This
is most typically used when a pressurized gas is used to manipulate
boost. This is typically only needed in drag racing, where the
consistency of the regulated pressure is advantageous for tuning. Carbon
Dioxide (CO2) is popular pressurised gase to use, as it isn't
flammable. Note that the solenoids should have the Normally Closed (NC)
and Common (C) ports connected as shown below, and the Normally Open
(NO) port blocked completely.
Enables a function where an external Trim Module can be used to driver adjustment of boost. When enabled the Trim Tab is available. (Default = Disabled)
Enables a function where a timed amount of extra boost is allowed via a selected input request to the Elite ECU. When enabled the Scramble Tab is available.
Select an available output wire, typically a DPO (Digital Pulsed Output) that will be wired to your Boost Control Solenoid.
Controls the direction of duty used to open or close the solenoid. Low will close the solenoid with 0% duty and open the solenoid with 100% duty. High will close the solenoid with 100% duty and open the solenoid with 0% duty. (Default = Low)
Boost Trim Input
Select an available input wire that will be used for the Trim control. Typically an AVI (Analogue Voltage Input) is selected due to the varying voltage signal used to adjust the boost level.
Scramble Boost Input
Select an available input wire that will be used for the Scramble Boost input. Typically an SPI (Synchronised Pulsed Input) or an AVI (Analogue Voltage Input) is selected and configured as a switch input.
Select from using Open Loop or Closed Loop Boost control (Default = Closed Loop)
Open Loop does not use a Target, rather it is a raw amount of duty that the user commands and boost level is tuned by varying this duty.
Closed Loop Boost Control uses a Target Pressure that the Boost Control system will try to achieve by adjusting duty up or down.
This is the most common selection for Controlled Parameter, and should be used most of the time.
Some specific applications, such as drag racing, will use Wastegate hat pressure control in order to control the boost pressure. This relies on the target pressure being set appropriately for the circumstances, as the control system is no longer looking at Manifold Pressure.
Obviously, in order to control the wastegate pressure, a wastegate pressure sensor must be used.
The frequency to be used by the Boost Control Solenoid. (Default = 33)
Active only when Closed Loop Mode is selected and Controlled Parameter is Manifold Pressure. The amount of Boost Pressure below the Target Pressure that must be exceeded before closed loop Short Term control of duty will commence. Eg. If the Target Pressure is 200kPa, and the Control Point Offset is 50kPa then Closed Loop control will activate when Boost Pressure exceeds 150kPa. Below this amount it will use the Closed Loop Base Duty Cycle table, or it will be fixed to 100% duty under this amount if the Spool Assist is Enabled. A value that is too low can cause the boost to overshoot the target. A value that is too high can cause Closed Loop to activate while boost pressure is not stable and lead to inconsistent boost control. (Default = 50)
Active only when Closed Loop Mode is selected. The rate at which the Boost Pressure is increasing must be below this amount before closed loop Short Term control can be active. This is to avoid boost control from making changes to the output duty while the boost is still climbing at a high rate and is not stable. (Default = 100)
Active only when Closed Loop Mode is selected and Controlled Parameter is Manifold Pressure. If the Boost Pressure exceeds the Target Boost by this amount the Duty will be set to 0%. i.e. the controller will disable. This is to try and prevent an overboost condition that may be dangerous to the engine or user. (Default = 15kPa)
Active only when Closed Loop Mode is selected and Controlled Parameter is Manifold Pressure. When Enabled this will cause the Duty to be 100% while boost pressure is positive and is lower than the Target Pressure minus the Control Point Offset. Eg. If the Target Pressure is 200kPa and the Control Point Offset is 50kPa, when the Boost Pressure is higher than 0kPa and is less than 150kPa the duty is fixed at 100%. This can be used to help build boost faster. When Disabled the corresponding Closed Loop Base Duty table value will be used instead. In some instances the Spool Assist can cause “spiking” above the target with varying throttle input. (Default = Disabled)
Active only when Closed Loop Mode is selected. The Short Term Trim Minimum TPS is the amount of throttle opening that must be exceeded before closed loop Short Term control can activate. This is to prevent the controller from making adjustments while the boost is not stable. Eg. if the throttle opening is low and is holding back the boost from reaching target, the controller would increase the boost duty to try and make the boost reach target. If the throttle is then opened to 100% this will cause the boost to overshoot the target. The STT Min TPS is used to prevent this occurring by only allowing corrections to be made while the boost is able to actually reach the target. (Default = 80)
Only active when Output Type is selected as One Solenoid. The amount of duty cycle required to make the Boost Pressure reach the Target Pressure. This table is to be adjusted if the boost pressure is not reaching or is exceeding the desired Target Pressure. Up to 4D mapping is available.
The amount of desired boost pressure to be targeted by the boost control system. Up to 4D mapping is available.
A delay time between meeting the conditions for Short Term control, and when control actually activates. This is to prevent the system from immediately making adjustments when boost may not have stabilised yet. Up to 2D mapping is available.
This allows mapping of the PID system, which controls the responsiveness of the Boost Control system. In simple terms the Proportional controls how fast the system will respond relative to how far it is from the target. The Integral is how aggressive the Proportional changes are. Derivative is used to slow down overshooting the target if the Proportional has been aggressively tuned. Up to 3D mapping is available for all PID tables.
Only active when Open Loop is selected as the Mode. This is the duty cycle to be used by the Boost Control system, and should be adjusted to reach the desired amount of boost. No boost target is used in Open Loop and the ECU does not make adjustments to the duty other than what is commanded by the tuner. Up to 4D mapping is available.
Available only when Closed Loop is selected as the Mode of control. The Long Term Trim allows the Elite ECU to learn the Base Duty table over time.
Enables the Long Term Trim control. (Default = Disabled)
Long Term Trim control is active only when the TPS is greater than this amount. This is to ensure learning is only possible during stable boost conditions. (Default = 90)
Long Term Trim control is active only when the RPM is greater than this amount. This is to ensure learning is only possible during stable boost conditions. i.e. to not learn when the Target Pressure is not possible to be reached. (Default = 2500)
Long Term Trim control is active only when the RPM is greater than this amount. This is to ensure learning is only possible during stable boost conditions. i.e. when turbo efficiency can cause the Target Pressure not to be reached. (Default = 7500)
Long Term control is active only when the vehicle is in this gear number or higher. This is to ensure learning is only possible during stable boost conditions, such as a turbo that has not reached operating speed in a lower gear.
Resets all Long Term correction tables back to zero for all values.
Applies any Long Term corrections to the Closed Loop Base Duty table, and after applying these changes it will reset to zero for all values.
Controls the rate at which the Long Term control can make corrections to the Long Term Trim table. Larger numbers will learn faster but can cause oscillations, and smaller numbers will make corrections at a slower rate. Up to 3D mapping is available.
Shows the amount of correction the Long Term Trim is making. This table is user definable for axis values, however the axis channels are fixed to be the same as are used for the Closed Loop Base Duty Cycle table. This table can be adjusted by the tuner simultaneously whilst the Long Term Control is making changes. Up to 4D mapping is available.
Allows additional correction tables for the Boost Control to be enabled. Enabling any of the Correction tables will open a Corrections folder under Boost Control in your list of tables in the ECU Navigator panel.
When the Mode is set to Closed Loop this will be an overall negative correction to the Target Pressure. When the Mode is set to Open Loop this will be an overall positive or negative correction to the Duty Cycle.
Allows Duty Cycle correction versus Air Temperature over a 2D table.
Allows Duty Cycle correction versus Coolant Temperature over a 2D table.
Allows Duty Cycle correction versus Gear Position over a 2D table.
Allows Duty Cycle correction versus Throttle Position over a 2D table.
Allows Duty Cycle correction versus Flex Fuel Composition (ethanol percentage) over a 2D table.
When enabled the Duty Cycle Generic Correction tab will become available. This table allows for any ECU channel to be used for boost control duty correction mapping. Up to 3D mapping is available.
Allows Target Pressure Correction versus Air Temperature over a 2D table.
Allows Target Pressure Correction versus Coolant Temperature over a 2D table.
Allows Target Pressure Correction versus Gear Position over a 2D table.
Allows Target Pressure Correction versus Throttle Position over a 2D table.
Allows Target Pressure Correction versus Flex Fuel Composition (ethanol percentage) over a 2D table.
When enabled the Target Pressure Generic Correction tab will become available. This table allows for any ECU channel to be used boost control target pressure mapping. Up to 3D mapping is available.
Only active when the Trim has been enabled in the Wiring tab.
When the Mode is set to Closed Loop this is the maximum amount of boost target pressure reduction allowed by the external Trim. When the Mode is set to Open Loop this is the maximum percentage amount of reduction of the duty cycle allowed by the external Trim. (Default = -100)
Only active when Scramble Boost has been enabled in the Wiring Tab. This allows for a temporary increase in boost pressure.
Active only when the Mode is set to Closed Loop. This is the amount of extra boost pressure to be added onto the Target Pressure while the Scramble Boost function is active.
The amount of extra duty cycle to be added to the boost control duty cycle while the Scramble Boost function is active. When the Mode is set to Closed Loop this value should be “0” and the Closed Loop Base Duty Cycle table should be set accordingly for the extra target pressure that is to be added.
Additional boost is applied as soon as the Scramble Boost button is pressed but will remain active for this amount of time after the Scramble Boost button is released.
The maximum total amount of time that the Scramble Boost can be applied.
Active when the Duty Cycle Generic Correction has been enabled.
Selected if you want to enable or disable the Duty Cycle Generic Correction table with a certain condition.
Selects the number of conditions, up to 3, that can be used to enable or disable the Duty Cycle Generic Correction table.
Allow selection of the ECU channel to be used
A selection of Equal To, Not Equal To, Greater Than, Less Than, Greater Than Or Equal To, Less Than Or Equal To that is to be used.
The value the maths must meet
Allows conditions to be combined so that multiple conditions must be met to enable or disable the Duty Cycle Generic Correction Table.
Active when the Target Pressure Generic Correction has been enabled.
Selected if you want to enable or disable the Target Pressure Generic Correction table with a certain condition.
Selects the number of conditions, up to 3, that can be used to enable or disable the Target Pressure Generic Correction table.
Allow selection of the ECU channel to be used
A selection of Equal To, Not Equal To, Greater Than, Less Than, Greater Than Or Equal To, Less Than Or Equal To that is to be used.
The value the maths must meet