Map Notes for 2004-2006 STi

Supported Vehicles:

  • USDM 2004-2006 STi




Map Revision:

MapVersion
Stage1v400
Stage2v400






Map Availability: 

Required Accessport Firmware: 

  • V3: 1.7.4.0-17431 or greater






Each map lists the minimum required octane. A higher octane fuel can be used safely on a map designed for lower octane. DO NOT use maps designed for higher octane with lower octane fuels. Top Tier gasoline should be used where available.

  • Maps designated with "93" are for use with 93 and 94octane fuel or better.
  • Maps designated with "91" are for use with 91 and 92 octane fuel or better.
  • Maps designated with "ACN 91" are for use with 91 octane fuel or better fuel found in Arizona, California and Nevada in addition to Canada.

These maps are designed for E10 fuel (fuel with 10% ethanol content). For those who only have access to E0 fuel (fuel with 0% ethanol) it is recommended to use the "91" octane version of the maps and datalog the car to ensure your fuel is performing to the necessary level. This is especially important for those using Canadian 94 octane E0 fuel. 
 

If you are unfamiliar with how to datalog using the Accessport or what to look for, you can find a guide on our website here
 

If any knock or detonation is present even when using the appropriate fuel, try reflashing a map that is intended for a lower octane fuel. 









Map

Peak Gains*

Stage1 ACN 91

+7% HP / +13% TQ over stock

Stage1 91+7% HP / +13% TQ over stock
Stage1 93+8% HP / +13% TQ over stock
Stage2 ACN 91+15% HP / +28% TQ over stock
Stage2 91+15% HP / +28% TQ over stock
Stage 2 93+17% HP / +28% TQ over stock

Stage 1

  • Intake Requirements: Stock airbox or COBB Tuning SF Intake SUB00001IA
  • Exhaust Requirements: Stock or COBB Cat-Back Exhaust 512100
  • Boost Target:
    • ACN91: ~16.5psi peak boost pressure tapering down to ~14.5psi by the 7000RPM redline, +/- 0.8 psi
    • 91 Octane 95 RON Minimum: ~16.5psi peak boost pressure tapering down to ~14.5psi by the 7000RPM redline, +/- 0.8 psi
    • 93 Octane 98 RON Minimum: ~16.5psi peak boost pressure tapering down to ~14.5psi by the 7000RPM redline, +/- 0.8 psi


C.A.R.B Note

The above Stage1 calibration is legal for use on Emissions Controlled Vehicles in all 50 states when used in accordance with the manufacturer's application guide because it and the parts have a California Air Resources Board (CARB) Executive Order (EO) number: 

Stage2 Maps

  • Intake Requirements: Stock airbox or COBB Tuning SF Intake SUB00001IA
  • Exhaust Requirements:
  • Boost Targets: 
    • ACN91: ~17.5psi peak boost pressure tapering down to ~15.0psi by the 7000RPM redline, +/- 0.8 psi
    • 91 Octane 95 RON Minimum: ~17.5psi peak boost pressure tapering down to ~15.0psi by the 7000RPM redline, +/- 0.8 psi
    • 93 Octane 98 RON Minimum: ~17.5psi peak boost pressure tapering down to ~15.0psi by the 7000RPM redline, +/- 0.8 psi



*Peak gains are measured as the difference between the highest points of the two plots. 

*Largest gains are measured as the largest gain at any single point between the two plots. 

Results may vary. Power as tested on 2004-2006 STi vehicles using these identical calibrations. Generally speaking, the 91 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 fuel; Arizona, California, and Nevada 91 octane fuel; and/or less than ideal atmospheric conditions. The maps designed for 93 octane are the most aggressive.






Non-Performance Maps

Anti-Theft Mode

  • Will not allow vehicle to start

Economy Mode MT

  • Fuel Requirements: 91 octane or better
  • Intake Requirements: Stock airbox or COBB Tuning SF Intake
  • Exhaust Requirements: Stock exhaust or upgraded turbo-back exhaust
  • Boost Control Solenoid: Stock boost solenoid or COBB 3-port Boost Control Solenoid
  • Boost Targets: Mechanical minimum (typically around 6psi - 12psi)
  • Rev Limiter: 7000 RPM

* Not intended for aggressive driving*

Valet Mode MT

  • Fuel Requirements: 91 octane or better
  • Intake Requirements: Stock airbox or COBB Tuning SF Intake
  • Exhaust Requirements: Stock exhaust or upgraded turbo-back exhaust
  • Boost Control Solenoid: Stock boost solenoid or COBB 3-port Boost Control Solenoid
  • Boost Targets: Mechanical minimum (typically around 6psi - 12psi)
  • Rev Limiter: 3200 RPM

All Stage1 and Stage2 performance maps include a “HWG” and “LWG”:

    • HWG: Higher wastegate duty cycles (HWG) for use when normal wastegate calibration produces lower than targeted boost (i.e. under boost).
    • LWG: Lower wastegate duty cycles (LWG) for use when normal wastegate calibration produces higher than targeted boost (i.e. over boost).  



* The addition of any other hardware may make the vehicle perform poorly.

** No other intakes, turbochargers, or fuel injectors are certified as compatible with these maps. **




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.




Revision Notes:

Version #Notes
v400Maps updated to eliminate unnecessary DTC Supression or updated versions for parity with other maps/vehicles within the platform
v350This map eliminates unnecessary DTC suppression.
v300Now compatible with Launch Control and Flat-Foot Shifting (LC/FFS) features (MT only). For complete details on how to enable and use the LC/FFS functionality, please visit this FAQ. These maps have been created with the newly-released AccessTUNER Pro 1.9.0.0. Maps created with this version of AccessTUNER software require the latest AccessPORT firmware (version 1.6.4.0-1189 or greater) be installed. All AccessPORTs must first be updated before using maps created with this latest AccessTUNER version. AccessPORT Manager 2.0 will automatically update the AccessPORT to the latest firmware version and is available for download on the COBB Tuning Support web page.
v117STU Maps have been updated to meet the new SCCA ST regulations.
v115This map has been updated to the latest AccessTUNER file format, v1.15. This map was originally created using a Stage2 map with stock boost, wastegate, and turbo table settings so that boost is not modified from stock settings and the map stays within the SCCA STU rules. We spent extensive time testing this map so that we could make more power through timing, fuel, and AVCS table modifications. This map was tuned to provide a performance tune for the SCCA STU classification for the STi. Only Sunoco GT 100, street legal fuel should be used with this map. This map has a much more aggressive timing curve and leaner fuel curve to take advantage of the higher quality Sunoco GT 100 fuel.
v111This map has been updated to latest AccessTUNER file format, v1.11.
v110This map has been updated to latest AccessTUNER file format, v1.10. Increased boost cut by ~1.5psi (0.1 bar). Minor smoothing of fuel and timing maps for improved driving quality.
v104Skipped. Syncing version numbers to reduce confusion.
v103Revised boost mapping to assist in more accurate boost targeting.
v102Revised wastegate duty cycle tables to accommodate for an obvious tolerance range from the factory VF39 turbochargers. Not all vehicles were producing consistent boost levels, even in testing unmapped, unmodified cars. Developed a wider variety mapping with different wastegate duty cycle tables to accommodate for this tolerance. Fixed error with speed limiter. Moved from 147mph to 186mph
v101

Revised fuel mapping to compensate for initial testing at altitude versus additional testing at sea level. Verified accuracy of altitude compensations in base mapping. 1.00 - Original Mapping. Adjusted Fuel, Timing, Boost closed loop control, and base programming logic.