Supported Vehicles:
USDM 2007-2008 Forester XT AT
USDM 2007-2008 Forester XT MT
Map Revision:
Stage1 93 MTv300
Stage1 91 MTv300
- Stage1 ACN91 MTv300
- Stage2 93 MTv300
- Stage2 91 MTv300
- Stage2 ACN91 MTv300
- VF43 93 MT300
- VF43 91 MTv300
- VF43 ACN91 MT300
Stage1 93 ATv300
Stage1 91 ATv300
- Stage1 ACN91 ATv300
- Stage2 93 ATv300
- Stage2 91 ATv300
- Stage2 ACN91 ATv300
- VF43 93 AT300
- VF43 91 ATv300
- VF43 ACN91 AT300
Map Availability:
- Download from the COBB Tuning Subaru OTS Map Database.
Required Accessport Firmware:
- V2: 1.6.4 or greater
- V3: 1.7.3.0-13565 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.
*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 2006 FXT 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.
Map | Peak Gains* |
|---|---|
Stage1 ACN91 | +11% HP / +28% TQ over stock |
| Stage1 91 | +11% HP / +28% TQ over stock |
| Stage1 93 | +13% HP / +28% TQ over stock |
| Stage2 ACN91 | +22% HP / +43% TQ over stock |
| Stage2 91 | +22% HP / +43% TQ over stock |
| Stage2 93 | +24% HP / +45% TQ over stock |
Stage1
- Intake Requirements: Stock airbox or COBB Tuning SF Intake
- Exhaust Requirements: Stock exhaust or upgraded cat-back exhaust
- Boost Targets:
- ACN91: ~13.0psi peak boost pressure tapering down to ~9.0psi by the 6700RPM redline, +/- 0.7 psi
- 91 Octane 95 RON Minimum: ~13.5psi peak boost pressure tapering down to ~9.0psi by the 6700RPM redline, +/- 0.7 psi
- 93 Octane 98 RON Minimum: ~13.5psi peak boost pressure tapering down to ~9.0psi by the 6700RPM redline, +/- 0.7 psi
Stage2
- Intake Requirements: Stock airbox or COBB Tuning SF Intake
- Exhaust Requirements: Stock exhaust or upgraded cat-back exhaust
- ACN91: ~14.8psi peak boost pressure tapering down to ~10.0psi by the 6700RPM redline, +/- 0.7 psi
- 91 Octane 95 RON Minimum: ~15.2psi peak boost pressure tapering down to ~10.0psi by the 6700RPM redline, +/- 0.7 psi
- 93 Octane 98 RON Minimum:~15.2psi peak boost pressure tapering down to ~10.0psi by the 6700RPM redline, +/- 0.7 psi
Map | Peak Gains* |
|---|---|
| VF43 ACN91 MT | +34% HP / +33% TQ over stock |
| VF43 91 MT | +36% HP / +45% TQ over stock |
| VF43 93 MT | +36% HP / +50% TQ over stock |
| VF43 ACN91 AT | +26% HP / +33% TQ over stock |
| VF43 91 AT | +36% HP / +45% TQ over stock |
| VF43 93 AT | +36% HP / +45% TQ over stock |
FXT VF43 Manual Transmission
- Intake Requirements: Stock airbox or COBB Tuning SF Intake
- Exhaust requirements: Upgraded catted turbo-back exhaust
- Turbocharger: IHI VF43 (2007 STi)
- Restrictor pill requirement: Stock restrictor pill from TD04 turbocharger
- Intercooler: 2004-2007 STi top-mount intercooler or equivalent
- Fuel Injectors: Stock fuel injectors
- Boost Targets
- ACN91: ~15.5psi peak boost pressure tapering down to ~12.0psi by the 6700RPM redline, +/- 0.8 psi
- 91 Octane 95 RON Minimum: ~16.0psi peak boost pressure tapering down to ~12.0psi by the 6700RPM redline, +/- 0.8 psi
- 93 Octane 98 RON Minimum: ~17psi peak boost pressure tapering down to ~12.75psi by the 6700RPM redline, +/- 0.8 psi
FXT VF43 Maps (Automatic Transmission)
- Intake Requirements: Stock airbox or COBB Tuning SF Intake
- Exhaust requirements: Upgraded catted turbo-back exhaust
- Turbocharger: IHI VF43 (2007 STi)
- Restrictor pill requirement: Stock restrictor pill from TD04 turbocharger
- Intercooler: 2004-2007 STi top-mount intercooler or equivalent
- Fuel Injectors: Stock fuel injectors
- Boost Targets:
- ACN91: ~15.5psi peak boost pressure tapering down to ~12.0psi by the 6700RPM redline, +/- 0.8 psi
- 91 Octane 95 RON Minimum: ~15.5psi peak boost pressure tapering down to ~12.0psi by the 6700RPM redline, +/- 0.8 psi
- 93 Octane 98 RON Minimum: ~16.0psi peak boost pressure tapering down to ~12.0psi by the 6700RPM redline, +/- 0.8 psi
Non-Performance Maps
Anti-Theft Mode
- Will not allow vehicle to start
Economy Mode v300
- 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 Targets: Mechanical minimum (typically around 6psi - 10psi)
- Rev Limiter: 6700 RPM
* Not intended for aggressive driving*
Valet Mode v300
- 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 Targets: Mechanical minimum (typically around 6psi - 10psi)
- Rev Limiter: 3500 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.
Revision Notes:
3.00 - Now 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.
1.10 - Original Mapping. Tuned AVCS, Boost, Fuel, Ignition, closed loop control, Dynamic Advance, Throttle Duty Cycles, and base programming logic to improve driving quality. Revised Closed Loop management (Base Map Change). Revised Boost Control parameters. Smoothed out boost related values, improved boost response at lower RPMs. Modified high RPM timing and dynamic advance parameters to allow for improved ignition advance learning when using improved octane. Modified Primary Fuel and Primary Ignition tables to account for the effects of AVCS tuning. Further tuned Dynamic Advance table to promote smooth transitional (low RPM to high RPM) acceleration. Raised speed limiter. Moved Speed Limits to 186 mph. Increased boost cut to 17.11psi at sea level. This map has been updated to latest AccessTUNER file format, v1.10.