BRZg2/GR86 RaceROM Boost Control
- Paul Blamire
Introduction
The boost control uses CANbus I/O exclusively to drive a wastegate solenoid, there are no OEM output hijacks involved and if you are moving to GR86 or RaceROM v13 and later from the original BRZ RaceROM this is very different! There is no other option and you must use a CAN based interface to add RaceROM boost control.
The boost control requires there to be an appropriate boost target, which can be limited through multipliers for various temperatures and the ignition advance multiplier, and capped based on gear and mapswitch mode.
With the target set, a base wastegate duty is looked up from a base duty map, with a basic proportional correction from a table, and integral map which increments over time based on a table. This can be further corrected for gear and intake temperature before being sent over CANbus to a suitable device that will drive the solenoid base on the duty value it receives.
CANbus output must be enabled, and configured such that the data sent can be received and interpreted by the CAN device.
Additional adjustments are available for ethanol tuning in the FlexFuel function, and further fine tuning can be done using RaceROM custom maps.
There is a fuel cut based boost safety limit, typically for turbo applications to prevent boost levels that may damage the engine
 Boost Control Maplist |
 Boost Control Logging Parameters
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Table of Contents
Supplemental Content
Platform Specific
General
Tuning
The boost control is structured in a way that you first set a target, and then use the control to make the boost pressure reach and follow the target.
The basic use is:
If you want increased boost pressure, raise the target in the gear/mode/rpm range you are interested in.
If you boost is consistently under target or slow to reach the target, and you want more boost, use more duty, not a higher target.
Tune the boost control for steady control using the proportional and integral functions
Adjust the boost targets from the maximums for safety, driveability and performance using the multiplier and maximum maps and tune the wastegate control so these targets are achieved.
Use targets to set the desired boost, use wastegate control to achieve those targets
Live data parameters
Boost Actual - The current boost level as an absolute pressure
Boost Error – Difference between MAP and Boost Target, positive numbers are over boost
Boost Delta - The rate of change of the boost pressure
Boost Target – Absolute pressure target in bar, measured by the intake manifold pressure sensor
Manifold Absolute Pressure – Absolute pressure in bar, measured by the intake manifold pressure sensor
Wastegate Base Duty – Output from Wastegate Duty Base maps
Wastegate Duty Integral – WG duty added by Integral correction of EcuTek boost control strategy
Wastegate Duty Proportional – WG duty added by Proportional correction of EcuTek boost control strategy
Wastegate Final Duty - The final value for the duty after all corrections and custom maps.
EcuTek ProECU tuning tools tools should only be used by experienced tuners who understand the product and engine calibration.
If you do not fully understand this product then you WILL damage your engine, ECU or your vehicle.
Please ensure you fully read all EcuTek manuals BEFORE attempting to use ProECU with your laptop or your vehicle.
Use with extreme caution and understanding at all times, if in doubt then do not proceed.
EcuTek accepts no responsibility for any damage to the engine, ECU or any part of the vehicle that results directly or indirectly from using the product.
** If you are in any doubt that you do NOT have the experience required to use this product then you should NOT USE IT **
Retail customers
** If you have any doubt that you do NOT have the experience required to use this product then you should NOT USE IT, you should simply contact your EcuTek Master Tuner shown clearly on the top of your Programming Kit or visit your preferred tuning shop to have a professional tuner use it for you **