Supported Vehicles:
Model year 2015-2020 STI (North American), 2015-2019 (ADM Spec).
*To confirm your model year, you can refer to the tenth value in the VIN number on the vehicle. For model year 2001-2009, the 10th value in the VIN will be the last digit of the model year. For model year 2010-2019, the 10th value in the VIN will be A-K, starting with 2010, ending with 2019.
Current Map Revision:
North American 2015-2018 STI | ADM 2015-2017 STI |
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Accessport Firmware:
- AP3-SUB-004: 1.7.4.0-17431 or greater
- AP3-AU-SUB-004: 1.7.4.0-17431 or greater
- Maps designated with "93" are for use with 93 and 94 octane/98 RON fuel or better.
- Maps designated with "91" are for use with 91 and 92 octane/95 RON fuel or better.
- Maps designated with "ACN91" are for use with 91 octane fuel found in Arizona, California, and Nevada or better. And additionally for those in Canada, for use with 94 octane Fuel at a minimum.
2015 - 2018 STI (all supported)
15-18 STI Stage 1 & 2
Stock HP TQ |
Peak Gains | Maximum Gains | |
Stage1 93 | +3% HP / +20% TQ | +22% HP at 4400 RPM / +25% TQ at 3800 RPM |
Stage1+SF 93 | +7% HP / +23% TQ | +24% HP at 4400 RPM / +28% TQ at 3800 RPM |
Stage2 93 | +3.5% HP / +29% TQ | +29% HP at 4400 RPM / +34% TQ at 3800 RPM |
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Results may vary. Generally speaking, the 91 (95 RON) and ACN91 calibrations run slightly lower boost, have a richer fuel curve, and a less aggressive ignition advance map to help compensate for 91 octane (95 RON) fuel; Arizona, California, and Nevada 91 octane fuel; and/or less than ideal atmospheric conditions. The maps designed for 93 octane (98 RON) are the most aggressive. |
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Stage 1
Stage 1+SF
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Stage 2 (ADM Only)
- Intake Requirements: Stock airbox with stock air filter
- Exhaust requirements:
- COBB Titanium 515140 or Stainless 515132 cat-back exhaust
- COBB GESi Catted Downpipe 524210
- Boost Targets:
- ACN91 octane: ~17.5psi [S#], ~15.0psi [S], or ~8.0psi [I] peak boost pressure tapering down as you approach the 7000RPM redline, +/- 1.0psi.
- 91 octane (95 RON) Minimum: ~18.0psi [S#], ~15.5psi [S], or ~8.0psi [I] peak boost pressure tapering down as you approach the 7000RPM redline, +/- 1.0psi.
- 93 octane (98 RON) Minimum: ~18.5psi [S#], ~16.0psi [S], or ~8.0psi [I] peak boost pressure tapering down as you approach the 7000RPM redline, +/- 1.0psi.
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** The Stage2 and Stage3 maps were developed using a COBB Tuning turbo-back exhaust system with a high-flow catalytic converter. An equivalent turbo-back exhaust system could also be used. If a lesser flowing turbo-back exhaust system is used then boost targets may not be achievable. These maps are NOT designed to be used with an aftermarket race downpipe that does not have a catalytic converter (i.e. catless). Doing so greatly increases the chance for boost spikes and boost creep.
*** Stage3 1050x mapping is not compatible with previous Stage3 kits which included 725cc injectors and did not include COBB rails and lines.15-18 STI Non-Performance Maps:
Anti-Theft Mode
- Will not allow vehicle to start
Economy Mode, Intake+Economy Mode
- Boost Targets: Typically around 6psi - 12psi
- Rev Limiter: 5800 RPM
Valet Mode, Intake Valet Mode
- Boost Targets: Typically around 6psi - 12psi
- Rev Limiter: 3200-3800 RPM
Monitoring Boost Levels:
The best way to determine if you are hitting target boost is to watch the TD Boost Error parameter. This parameter is your target boost (including altitude and temperature compensations) minus your actual boost (negative values mean you are over the target by the amount while positive values mean you are under). Ideally you want this value to be between 0 and 1.0 at wide open throttle (WOT), but -1.0 to 1.0 is acceptable assuming that you don't have any significant knock corrections. Overboosting is more likely to occur in higher gears and with colder outside temperatures, so be sure to verify boost levels during these conditions.
High Altitude:
A quick note for those of you that live at higher altitudes: it is common for turbocharged cars at higher altitudes to run less boost pressure due to lower air pressure and air density. Your turbocharger has to work harder to compress a less dense air mass compared to the same turbocharger at sea level. This must be factored in when determining if your turbocharger is running the proper amount of boost pressure and not being pushed beyond its efficiency range.
Example: If you live in Denver at 5280 ft and are trying to run a peak boost pressure of 15 psi, your turbocharger has to work the equivalent of making ~17.5 psi at sea level.
There are barometric compensations within the factory ECU that lower boost targets as you climb in altitude in an effort to keep the turbocharger in its optimal range. The COBB performance maps utilize these compensations and therefore, it is perfectly normal for the final boost target to be lower than what is listed for your map.
Boost Select:
All maps designated with "Boost Select" in the map name have a driver-controlled boost target controlled through the SI-Drive system available on the 2008+ STI. From the factory, SI-Drive will modify throttle settings and change the relation between what is done with the accelerator pedal and how the throttle blade reacts; [S#] being the most aggressive throttle settings, [S] being less aggressive, and [I] being very conservative. What we have done is take that functionality a step further. The "Boost Select" maps have selectable boost targets enabled by toggling between [S#], [S], and [I]. [S#] will target the highest boost level, [S] will be a medium boost level, and [I] will be the lowest boost level (wastegate spring pressure). You can find the specific boost targets for [S#], [S], and [I] in the Map Version Notes above.
Revision Notes:
| Version # | Notes: |
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| v400 | This map was updated to eliminate unnecessary DTC Supression or update versions for parity with other maps/vehicles within the platform |
| v350 | Revised IAT based ignition comp., boost compensations for baro., per gear, intake temp., coolant temp., revised 18 STI RA/19 STI North American spec engine calibrations. |
| v347 | Minor visual updates on North American spec MY18 STI Type RA Stage1 maps. Boost Limits table update on ADM 2018 Stage1+SF 93 map only. |
| v346 | Adjusted MAF calibration on North American spec MY18 STI ACN91 Stage1+SF maps only. v345 for North American spec MY 18 STI ACN91 Stage1+SF was only available for a few hours, but if you have it, please use v346 or newer instead. |
| v345 | Updated boost target, limit tables to account for MY2018 OEM strategy change. |
| v340 | Original Mapping. Adjusted Fuel, Ignition, Boost Control, Camshaft Phasing (AVCS), Closed Loop to Open Loop Transition, Per-Cylinder and Per-Gear Timing Strategy, Intake Air Temperature Compensations, Barometric Compensations, and Engine Load Compensations. Added Boost Select (see above for description), Speed Density, Launch Control, and Flat-foot Shifting capabilities. |