Subaru Updates : Accessport Fast Flashing and COBB 20g Turbo!!

2015 Subaru STI

The Subaru group has been quite busy as of recent, we’re excited to announce the release of some awesome Accessport updates as well as our new COBB 20g turbocharger for the 2008-2015 STI.

Accessport Updates (AP3-SUB-004:

SUB-004 Accessports received an update that significantly improves flash times on Subaru DIT ECUs.  These improvements reduce Install and Uninstall times by over 60 seconds, now coming in right at 2 minutes.  Protuners, rejoice!  Change map times have been improved by 93%, now taking less than 20 seconds!

With R&D completed on 2015 WRX 6MT cars with a full turbo-back exhaust, we’ve renamed the “Stage1+TBE” maps to a more conventional “Stage2″ naming strategy.

  • Stage2 91 v115.ptm
  • Stage2 93 v115.ptm
  • Stage2 Economy Mode v115.ptm
  • Stage2 Valet Mode v115.ptm

For vehicles experiencing underboost conditions, the following High Wastegate maps can be found online at

  • Stage2 91 v115 HWG.ptm
  • Stage2 93 v115 HWG.ptm


New Subaru Hard Parts

COBB TD05H-20g Turbocharger


The COBB 20G is an ideal turbo upgrade for those looking to increase the top-end power of their STI while maintaining low and mid-range response. Capable of producing 400hp and retaining excellent throttle response, the COBB 20G is a perfect turbocharger for street or track use!

For more information and ordering, visit the product page!


2015 Subaru STI Stage1+ Power Package

Stage1+ 2015 STI



Combine the worlds best selling, most flexible ECU upgrade solution with the COBB SF Intake/Airbox combo to give your 2015 STI more power and greatly improve driveability!

For more information and ordering, visit the product page!

Subaru SF Airbox Edge Trim and Trimlock

SF-Heatshield-Edgetrim_main SF-Heatshield-Trimlock_main

If the Edge Trim or Trimlock from your Subaru SF Airbox has been damaged or gone missing, we now have replacements available to get your SF Airbox looking new again!

2015 STI SF Airboxes use Edge Trim while all other Subaru SF Airboxes use Trimlock.

For more information and ordering, visit the product pages!

Edge Trim:


Mazdaspeed Updates : Engine On/Off Detection, Accessport Advanced Adjustments, Accesstuner Improvements


The COBB Mazda Expert Group has been working on a host of updates for this platform and excited to announce immediate availability of the following features!  Wastegate Duty Cycle, Flat Foot Shifting, and Launch Control adjustments can now be made utilizing the Accessport.  Previously, it was necessary to make adjustments using Accesstuner, these changes can now be made in-car!

Accessport Firmware Updates (

Engine On/Off Detection:

This feature, when enabled, allows the Accessport to power on when the vehicle is detected to be running and shut down once the engine has been turned off.  By default, this feature is disabled.  If you wish to use this feature, simply follow the instructions in the Knowledge Base article linked below!

COBB Knowledge Base : Enable Engine On/Off Detection

Accessport Advanced Tuning:

These settings will enable the ability to make minor adjustments to maps to enable Flat-Foot Shifting(FFS) and Launch Control(LC), as well as adjust Wastegate Duty Cycle.

Note: LC and FFS adjustments are only available on COBB v234 OTS maps (or higher) and Wastegate adjustments are only available on COBB OTS maps.  In order for LC and FFS adjustability to be active with a custom tune, maps will need to be resaved in Accesstuner Version (or newer)

By default, these features are disabled.  To enable Advanced Tuning Settings, follow the instructions in the Knowledge Base article linked below!

COBB Knowledge Base :  Advanced Tuning Settings

Off-The-Shelf Map Updates:

COBB Stage 1, Stage 2, and Stage 3 maps have been updated to v234 to support Advanced Tuning settings.

  • Stage1 v234.ptm
  • Stage1+ v234.ptm
  • Stage1+ with IC v234.ptm
  • Stage1+DP v234.ptm
  • Stage1+SF v234.ptm
  • Stage1+SF+DP v234.ptm
  • Stage2 v234.ptm
  • Stage3 v234.ptm

Non-Performance maps will remain at v233 (no updates)

Accesstuner BETA Updates (

The following changes have been made to Accesstuner as a BETA release.  In order to update to BETA software, launch Accesstuner and go to Help -> Updates -> Check for Updates.  Toggle the check box for “Beta Software”.

V3 Accessport Adjustments Compatibility:

Maps saved by this version of Accesstuner add compatibility for Accessport Advanced Tuning adjustments(LC/FFS).

  • Note: WGDC adjustments is only compatible with COBB v234 OTS maps

Steering Wheel Angle Sensor (SWAS) for Gen 2 Mazdaspeed3:

When traction control is turned off, these two toggles will eliminate torque reduction based off of steering wheel angles in first and second gear.

swas _toggles

Torque Reduction:

DBW Throttle A/B/C Compensation: These tables represent the amount of compensation, or correction made to the DBW Duty Cycle when torque limiting is requested.


Gen 1 Mazdaspeed3 / Mazdaspeed6 Shift Compensations (MS6 Stutter Fix):

Shift Timer – Shift timing delay based on gear.
ECT Based Shift Timer Compensation – This table enables/disables shift timing based on Engine Coolant Temperature.


  • USDM 2006-2007 MAZDASPEED6
  • USDM 2007-2009 MAZDASPEED3
  • WM 2004-2007 MAZDASPEED6 / Atenza / MPS
  • WM 2007-2008 MAZDASPEED3 / Alexa / MPS

Other Miscellaneous Accesstuner Updates:

Table Description Pane – displays description for selected table below the table list.


Other various improvements include improved Window Dialog Size, Undo feature, Direct Cell Edit, and Table Cell Selections.

Mustang Ecoboost – Intake and Intercooler Evaluation!

Our Ford Expert Group has been cranking away with the Ecoboost Mustang! In this video, Braden discusses what he’s been working on with Cold Air Intake and Front Mount Intercooler upgrades!

Porsche Testing in Japan with Mitch McKee of COBB!


I am a big proponent of on track testing calibration’s. We want to be sure that right out of the box you guys are getting a calibration that we are 100% with. We did this with the 997.2 Turbo, taking the car to Laguna Seca and winning the Optima Challenge with a car setup by BBI and tuned by Cobb Tuning using the Accessport.

Now for this we wanted to show the Japanese guys what American tuners are capable of! I think we did pretty good

To start off we had 2 cars to test. A 997.1 GT2 and a 997.1 GT3. The GT2 was bone stock even down to the old Michelin’s. The GT3 had some muffler deletes and suspension.

Both were beautiful cars and it really was an honor that the customers let us test them sight unseen. Creft Motorsports is a shop in Yokohama and they were very helpful in getting the cars all setup.

Both cars were faster by a large margin at Fuji Speedway. Fuji speedway may be one of the most beautiful tracks on the planet as far as I am concerned. With Mt. Fuji looming behind the track it makes for beautiful scenery.

Now on to the pics! As soon as I get a little more time I will get the video up as well. ( Be warned I am a much better engineer than photographer!)


Me with Fuji-San checking datalogs after coming in from a quick morning session.

997.1 GT3 AP

This is just because I love these cars so much:

Thanks for looking guys! We have some more content to put up once it is edited!

Nissan GT-R Rolling Launch – Dyno Testing

We’ve been testing some exciting new features for the GT-R platform!  

With roll-racing events becoming more and more popular, our Rolling Launch feature will allow cars to build boost while maintaining a constant speed.  With the release of a button, full power is on tap!

Check out this quick video of our GT-R Experts testing this new feature on our in-house dyno!



2015 WRX Rev Hang

For 2015, Subaru introduced a completely overhauled WRX!  There are some awesome new changes, like direct injection,  and other changes many aren’t too thrilled about.  Subaru’s new “Rev Hang” logic seems to top the list of complaints.  Luckily though, COBB is hard at work coming up with a solution!

What is Rev Hang?

Typically, when you are in gear and revving high into the RPM range, pressing in the clutch would result in the RPMs quickly falling.  With Rev Hang, the RPM stays constant for a bit and slowly falls.

This isn’t necessarily a bad thing.  However, many car enthusiasts are purists and feel the only inputs the car should be considering, especially when it comes to throttle, come only from the driver.  We tend to agree!

Here’s a quick video of the Rev Hang “Fix” in action:


This does look subtle on video but if you own or have driven a 2015 WRX, you know how big a difference this will make!  Check out the latest v111 maps to try out the fix:  Stay tuned to our Website, Facebook Page, Twitter, Instagram, and Blog for the latest!

Porsche Updates – Brake Boosting and Adjustable Launch Control

Porsche 997 Turbo

The most powerful Porsche tuning software available just got better!

Brake boosting and adjustable launch control are now available for 997.2 Turbo Porsches.  Brake Boosting will allow users to build boost for roll-racing events which are becoming increasingly popular.  Adjustable Launch Control offers the ability to adjust Launch RPM to maximize traction when accelerating from a dead-stop.  These features are available exclusively from COBB using the Accessport and Accesstuner Pro!  No other tuning solution can offer these performance features, ease of use, and tuning support.  Simply launch Porsche Accesstuner or Accessport Manager and run updates!

2015 Subaru STI Development Update – COBB SF Intake Testing

So, you’ve probably seen some pretty cool early results from hardware swaps on the 2015 STI platform.  But, have you seen any actual data besides some basic dyno charts with really high smoothing?  Probably not. :) Lucky for you, we’re here to provide actual quantified data behind the madness.

Many people were initially disappointed that our first release only included Stage1 maps.  This was because we prefer to *thoroughly* test parts to find out what each modification will do so that we can be sure our Staged Package offerings have a definitive gain for your investment.  For example, here is a NASIOC thread showing some of the testing we did to compare power output when a downpipe is added to a 2015 STI:

For intakes, we decided that looking at only power wasn’t good enough.  An age-old claim in Subaru world is that the factory airbox is not restrictive with the stock turbo, and we wanted to see it for ourselves.  We put this to the test by measuring turbo inlet vacuum generated on the stock airbox and with a COBB Tuning SF Intake system fitted to the car.  Garrett refers to vacuum in the turbo inlet as “depression”:  “Any restriction (caused by the air filter or restrictive ducting) will result in a “depression,” or pressure loss, upstream of the compressor that needs to be accounted for when determining pressure ratio.” (

By comparing the depression created by the factory intake against an upgraded intake, we can actually “see” if we have removed a restriction or not.  If the depression is the same, well, all we’ve done is added a noise-maker to the car :)

To complete this test, we first gathered boost and depression data on the stock airbox using a stock-hardware 2015 STI (tuning only), first on wastegate boost pressures only, then at ~17.5psi peak via our Stage1 93 OTS map in “S#” mode.  Next, we gathered the same data on the COBB SF Intake, with no calibration changes other than for the different MAF curve required.

What did we find?  Results!  The stock airbox creates depression levels of a bit over 1psi on wastegate boost at redline, and well over 2psi on the Stage1 boost levels!  What does this mean?  Here in Austin, where the elevation is ~800 ft, the barometer was ~14.21psi for the testing day.  With the stock airbox at redline, the turbo was only being fed with approximately 12psi of pressure due to the depression.  For comparison, this would be the same as running the car at 5500 ft of elevation if there were no depression!

Here is the boost and depression (intake pressure) data for wastegate and for 17.5psi, shown in gauge pressure relative to ambient atmosphere:

Boost and Intake Pressure – Wastegate Spring Only


Boost and Intake Pressure – 17.5psi Setting

As you can see, thanks to the reduction in depression with the upgraded intake, boost is a bit higher on the wastegate.  At 17.5psi, we can see that spool has improved and high RPM boost is held out better on the same WGDC settings.  In each case, the depression created by the COBB SF Intake system is roughly half of the factory airbox.  What does this mean?  Simply put, we’ve reduced restriction in the turbo’s inlet path, as shown by the reduction in depression.

I also decided to take this data one step further, which is to calculate the turbocharger’s effective pressure ratio for each case.  One caveat is that we’re looking at post-IC pressures, not pre-IC, but because the intercooler has not changed at all between tests, it shouldn’t skew the results too greatly.

Here is the pressure ratio for each scenario (again, baro in Austin was ~14.21psi on testing day), calculated using Garrett’s methodology here:

Pressure Ratio Comparison – Wastegate Spring Only


Pressure Ratio Comparison – 17.5psi

On wastegate boost pressures, we can see that there isn’t too drastic of a difference — perhaps a tenth of a point at very most.  However, at 17.5psi, we can see the COBB SF Intake really start to separate itself: pressure ratio is decreased by about two full tenths across the board after spool.  What does this mean?  The turbocharger compressor is now operating more efficiently, at least in terms of the demanded pressure output (boost) again the amount of pressure available at the input.

So, at the end of the day, here’s what power looks like between the two.  COBB SF Intake are the solid lines, stock airbox are the dashed lines:

Stage 1 vs Stage 1+SF Intake Dyno Comparison

Long story short?  On the 2015 STI, even in otherwise-stock configuration, the COBB SF Intake system (and others that have the same or better airflow capabilities) help the turbo breathe easier and in turn, make the same boost more efficiently or more boost at the same efficiency when compared to the stock airbox.

Thanks for reading along! Hopefully you found this data interesting and helpful. We plan to keep providing results like this as we dig in further on the 2015 STI and WRX, so stay tuned :)


The COBB Subaru Expert Group

COBB Releases BMW Stage 1+ Front Mount Intercooler and Stage 2 Downpipe with OTS Map Support

COBB is proud to announce the release of our BMW Front Mount Intercooler and N55 Downpipe along with off-the-shelf map support!

COBB BMW 1 & 3 Series N54-N55 FMIC Kit

COBB N54/N55 FMIC – One of the best power modifications for your BMW 1 or 3 Series – Click here for more pictures and details.

COBB BMW N55 Downpipe Kit

COBB BMW N55 Downpipe – Take your N55 powered BMW up to Stage 2! Click here for more pictures and details.

Tune your ECU for these modifications using our off-the-shelf maps!


COBB January 2013 Releases – New Nissan GT-R Support and Features


COBB is excited to announce the full world market support for the latest generation of the 2012 and 2013 Nissan GT-R (2011-2012 World Market). This support will be rolled into our existing Nissan GT-R Accessports, part numbers AP-NIS-005 and AP-NIS-006. Our Accesstuner software has also been updated to allow custom tuning of the 2012 and 2013 Nissan GT-R by both professional tuners and DIY tuners alike. Read on for more details about the work COBB is doing to make sure the Accessport is the most comprehensive tuning solution for GT-R performance enthusiasts.

Off the Shelf Map Improvements

Along with the application support, COBB would also like to announce the most comprehensive set of Off The Shelf COBB GTR calibrations to date with features directly requested by COBB GTR customers.

  • Map support for different fuel types translating to the perfect tune for your region’s fuel type.
  • 100 octane performance maps available for free download from the COBB website.
  • Up to 4 boost levels (13, 15, 17, 18 psi) and valet mode per calibration – easily accessible from cruise control buttons.
  • Popular mechanical configurations supported including stock (Stage 1) and exhaust modifications (Stage 2) in addition to 2.75” and 3.0” diameter COBB SF and BigSF GT-R intake kits.

Supported Vehicles:

  • 2011 ADM GT-R
  • 2011 East Asia GT-R
  • 2011 EDM GT-R
  • 2011 Gulf Spec. GT-R
  • 2011 JDM GT-R
  • 2011 South Africa GT-R
  • 2012 ADM GT-R
  • 2012 East Asia GT-R
  • 2012 EDM GT-R
  • 2012 Gulf Spec. GT-R
  • 2012 South Africa GT-R
  • 2012 USDM GT-R
  • 2013 USDM GT-R

Map Revision (version 404):

OEM Intake/COBB SF Intake (2.75”):

  • Stage1 91 OCT or 95 RON v404
  • Stage1 93 OCT or 97 RON v404
  • Stage1 100 OCT or 102 RON v404
  • Stage1 ACN91 OCT or 95 RON v404
  • Stage2 91 OCT or 95 RON v404
  • Stage2 93 OCT or 97 RON v404
  • Stage2 100 OCT or 102 RON v404
  • Stage2 ACN91 OCT or 95 RON v404

COBB BigSF (3.0”):

  • Stage1+BigSF 91 OCT or 95 RON v404
  • Stage1+BigSF 93 OCT or 97 RON v404
  • Stage1+BigSF 100 OCT or 102 RON v404
  • Stage1+BigSF ACN91 OCT or 95 RON v404
  • Stage2+BigSF 91 OCT or 95 RON v404
  • Stage2+BigSF 93 OCT or 97 RON v404
  • Stage2+BigSF 100 OCT or 102 RON v404
  • Stage2+BigSF ACN91 OCT or 95 RON v404

New Features!

The Nissan GT-R Performance mapping for v404 includes:

  • Real -Time map switching with the cruise control buttons.
  • This Accessport firmware enables users to switch between real-time maps on-the-fly using cruise control controls. The v4.04 calibrations contain 4 to 5 active map slots targeting 15, 16, 17 and 10 psi (valet). Some high octane calibrations contain map slots targeting 18+ psi. See the map long description for specific details. Peak boost levels will vary with altitude and exhaust modifications.
  • Heads up display based engine knock warning.
  • Knock monitoring with the Heads-Up-Display is not available for MY11+ GT-Rs during this initial release. Knock activity can be observed by monitoring the “High Det. Flag” and “Dynamic Timing Advance” monitors on the Accessport

Please see individual map notes for additional information and instructions for use. And as always, if you have any questions, just contact COBB Support: