COBB Custom Features for 2006-2007 WRX / 2004-2007 STI
COBB Custom Features are now available for supported GD Subaru WRX and STi vehicles! Outlined below are the additions to Accesstuner Pro and Accessport firmware as a part of this release. Most notable features are Flex Fuel, Fuel Pressure Differential, Per Gear Boost Targets/Wastegate Duty Cycle control, and Custom Sensor Logging. Along with these software updates, we are also excited to announce the immediate availability of COBB Flex Fuel hardware and packages! Paired with a custom tune via Accesstuner, you can expect a seamless transition to Flex Fuel for your supported Subaru WRX or STi.
COBB Flex Fuel Hardware for GD Subaru WRX and WRX STi
In order to best utilize the new COBB Custom Features ECUs, we now offer Flex Fuel Sensor Kits, Fuel Pressure Sensor Kits, and an assortment of packages for supported GD Subarus! Ethanol Sensor Kits will include brackets specific to GD WRX or STi as indicated below.
SUBARU FLEX FUEL ETHANOL SENSOR KIT (3 PIN) STI 2004-2006, WRX MT 2006-2007
A complete plug and play solution enabling users to convert their supported Subaru STI to a Flex Fuel configuration without losing factory compensations. This is the easiest to use and most sophisticated Flex Fuel kit on the market. Utilizing OEM fuel and electronic connectors, the Ethanol Sensor Kit measures the ethanol content of fuel being fed to the motor. That data is then converted into a signal that the ECU can use for adjusting calibrations and to be displayed on a custom Accessport monitor.
 |
Features
|
Vehicle Compatibility
|
SUBARU FLEX FUEL ETHANOL SENSOR KIT (5 PIN) STI 2007
A complete plug and play solution enabling users to convert their supported Subaru STI to a Flex Fuel configuration without losing factory compensations. This is the easiest to use and most sophisticated Flex Fuel kit on the market. Utilizing OEM fuel and electronic connectors, the Ethanol Sensor Kit measures the ethanol content of fuel being fed to the motor. That data is then converted into a signal that the ECU can use for adjusting calibrations and to be displayed on a custom Accessport monitor.
 |
Features
|
Vehicle Compatibility
|
SUBARU FUEL PRESSURE SENSOR KIT (3 PIN) STI 2004-2006, WRX MT 2006-2007
Monitoring Fuel Pressure is vital on any vehicle, especially those that are asking more of their fuel system. As demand on a fuel system increases, so do the consequences of a failure. Monitoring fuel pressure will alert users if there is a fault in the vehicles’s fuel system. Utilizing existing inputs, the Fuel Pressure Sensor Kit allows users to monitor Fuel Presure on a custom Accessport monitor.
 |
Features
|
Vehicle Compatibility
|
SUBARU FUEL PRESSURE SENSOR KIT – STI 2007-2017, WRX 2008-2014
Monitoring Fuel Pressure is vital on any vehicle, especially those that are asking more of their fuel system. As demand on a fuel system increases, so do the consequences of a failure. Monitoring fuel pressure will alert users if there is a fault in the vehicles’s fuel system. Utilizing existing inputs, the Fuel Pressure Sensor Kit allows users to monitor Fuel Presure on a custom Accessport monitor. This is the same kit that has been available for the 2008-2017 Subaru STI as the 2007 STi utilizes the same configuration.
 |
Features
|
New Vehicle Compatibility
|
SUBARU FLEX FUEL PACKAGE (5 PIN) – STI 2007
The Flex Fuel Package includes both the Ethanol Sensor Kit as well as the Fuel Pressure Sensor Kit. Utilizing COBB Custom Features along with this package, both Fuel Pressure and Ethanol Content values are able to be sent to the ECU and monitored via custom Accessport Monitors.
 |
Features |
Vehicle Compatibility
|
SUBARU FLEX FUEL PACKAGE (3 PIN) – STI 2004-2006, WRX MT 2006-2007
The Flex Fuel Package includes both the Ethanol Sensor Kit as well as the Fuel Pressure Sensor Kit. Utilizing COBB Custom Features along with this package, both Fuel Pressure and Ethanol Content values are able to be sent to the ECU and monitored via custom Accessport Monitors.
 |
Features |
Vehicle Compatibility
|
SUBARU AN ADAPTER FITTINGS STI 2004-2016, WRX 2006-2017
The Subaru AN Adapter Fittings include 2 black anodized -6 AN Male to 3/8″ SAE Quick-Disconnect Female adapters. These adapter fittings allow users that already have upgraded fuel lines installed to easily modify their existing setup to work with the COBB Ethanol Content Sensor.
 |
Features
|
Vehicle Compatibility
|
COBB Custom Features for GD Subaru WRX/STI
Vehicles Supported
- 2004-2007 USDM WRX STi
- 2006-2007 USDM WRX MT
Accesstuner Pro Updates
Subaru Accesstuner version 1.9.1.0-14336 and newer will include the features outline below.
COBB Custom Features (CCF) ECU Type
Supported vehicles will now have an additional Tuning Strategy available in the ECU Selection Dialogue box. The CCF ECU type is only applicable to V3 Accessports.
Extended Monitor Logging Feature
During development of COBB Custom Features such as Flex Fuel our calibration team noted that data logging with the added monitors was not possible due to native ECU limitations. Our software team was able to make changes to how monitors are referenced which allows users to log additional monitors with zero to minimal impact on resolution. Depending on monitors selected, users may be able to log up to double the number of monitors allowed previously.
Additional Tables for 2002-2005 WRX
The tables below have been added to both the MAF and Speed Density ECU types for the 2002-2005 Subaru Impreza WRX.
- Boost Limits (Fuel Cut) Delay
- Fuel Injector End of Injection (Beta)
- Idle Control Valve Duty Final Limit (Min/Max)
- Ignition Coil Dwell
- Overrun Fuel Resume/Cut Thresholds, Delay, and Initial Enrichment (15 total tables)
Accessport Firmware Updates
The below updates are now available to AP3-SUB-002 Accessports utilizing firmware version 1.7.3.0-14336 and newer.
Note: COBB Custom Features ECUs are not supported on the Version 2 Accessport! Do you have a supported WRX or STi with a V2 Accessport? Take advantage of our Accessport Trade-In Program!
Extended Monitor Logging Feature
Applicable to the 2004-2006 STi CCF ECUs and 2006 WRX CCF ECU, Accessports with updated firmware will now benefit from higher logging resolution and the ability to log additional monitors without greatly reducing resolution.
Additional Monitors
The following monitors were released in a previous version of Accesstuner and are now also available on the Accessport itself.
- Fuel Cut Flag
- Ign Comp Tip-in
- Wall Wetting 1
- Wall Wetting 1A
- Wall Wetting 1B
- Wall Wetting 1C
- Wall Wetting 2
- Wall Wetting 2A
- Wall Wetting 2B
- Wall Wetting 2C
- Wall Wetting 3A
- Wall Wetting 3B
- Wall Wetting 3C
- Wall Wetting 4
- Wall Wetting Final
Miscellaneous Firmware Updates
Throttle Position monitor rounded to tenths.
Any plans for flex fuel support for 02-05 wrx?
We do not currently have plans to add Flex Fuel support to the 2002-2005 WRX ECUs. Sorry for the bad news!
Marshall@COBB
ouch nothing for 02-05 damn my heart hurts this would really help alot damn oh well :[
Yeah, I feel you (I own a 2004 WRX). The early WRXs did receive some new tables as a part of this release however it looks like we may need to look into an STI ECU in order to take advantage of the CCF offering.
Marshall@COBB
What do I need to do to order the stage 3+ kit for my 2016 STI.
Hey Gregory,
Our Stage 3 Power Packages for Subaru are currently on back-order as we transition into using the new 1050x fuel injector. We are currently waiting on our calibration team to complete the generation of new Off The Shelf maps compatible with the 1050x fuel injectors. A current alternative would be to order the parts and have an Authorized Protuner create a custom tune for you. If you are willing to wait a bit longer, the OTS maps should be available this summer.
Marshall@COBB
Marshall,
Does Cobb have plans to do FlexFuel for 4th gen Subaru Legacy GT’s(05-09)?
We do not officially have plans to offer Flex Fuel for the Legacy GT however it has been discussed internally. If demand is constant, we very well may look into it!
Marshall@COBB
That would rock! I know a bunch of LGT owners are very interested. Where I live its hard to get a constant supply of E85(harder to even get true E85) so the flex has a lot of appeal.
Absolutely fantastic news! Been waiting on this since late summer last year, so I can’t wait to get this on my 2007 STi. I know 2007 was a unique model year in several ways, but I’m curious why it has its own kit, separate from the other GD STi models. Is the 3 pin vs 5 pin connector the only reason, or are there other changes as well?
Hey Justin! You hit the nail on the head. The only difference for the 2007 STI kit is the use of 5-pin connectors whereas other GD vehicles use a 3-pin connector.
Marshall@COBB
Im not sure if this update applies, but is it possible to datalog a wideband sensor through a APv3 on a 02 WRX?
We do not offer a direct plug and play solution for that however many people do utilize a 5v input to log wideband voltage and then translate that into AFR through logging software (or if you’re quick, on the fly).
Marshall@COBB
Still no plans for 02-05 wrx flex fuel?
Not currently. Sorry for the bad news!
Marshall@COBB
I’m not sure if this has been answered but here it goes, I have a 06 Wrx and am looking into your flex fuel kit I see that the kit dosnt include injectors or a pump is that because they kept the same size injectors from the previous model along with the smaller turbo for the 2.5? Or will I need bigger injectors and a fuel pump as well as what’s also in the kit
Hello,
That is a good question. We would like to have a full kit in the future for that year model but we currently don’t have a compatible fuel line option. As you’ve probably seen on the website. We do have the Flex Fuel kit with the sensors, and we have upgraded injectors. Those are an absolute must to run ethanol. Technically the stock rails and fuel lines will fit with those parts, but considering the age of the car and the fact it wasn’t designed for ethanol from the factory. I would recommend upgrading the rails, lines, and pump as well. The rails for the 2008+ STI will also work on your WRX, our part number is 343150 https://www.cobbtuning.com/products/fuel-system/subaru-fuel-rails-sti-2008-2019.
So even though we do not have an official kit/package yet. We have everything you need other than the lines. So if you buy our FF kit, our rails, the AEM pump, and our injectors. You just need to work with a shop or check with IAG Performance to provide ethanol safe fuel lines and that should do the job.
Adam@COBB