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Old 02-08-2012, 07:59 PM   #1
Cobb Tuning
Member#: 4803
Join Date: Mar 2001
Location: Austin, TX
Default COBB Tuning Speed Density Available in AccessTUNER Race

COBB Tuning is proud to announce the immediate availability of our self-tuning proprietary Speed Density (SD) tuning solution for all currently-supported 2.5L USDM turbocharged Subaru vehicles! This capability is available as a free update to our AccessTUNER Race software and AccessPORT firmware. Our implementation of Speed Density adds our proprietary tuning logic to the factory ECU, enabling it to calculate load, ignition and fueling requirements using the engine’s manifold absolute pressure (MAP) sensor, instead of the factory mass airflow (MAF) sensor. COBB Tuning’s exclusive Realtime tuning capabilities and Hybrid Logic (active switching between MAP and MAF based logic) make this a uniquely powerful and flexible engine management solution. Read on for more details about the work COBB Tuning is doing to make sure the AccessPORT is the most comprehensive OEM ECU tuning solution available for Subaru performance enthusiasts.

Why Speed Density
The most basic function of an engine control unit (ECU) is to measure airflow and its translation to engine load. Precise and consistent load calculations along with feedback from other critical sensors allow the ECU to accurately control ignition timing, variable camshafts, and fuel delivery. The most common way to measure load in modern vehicles is with a MAF sensor. Vehicles with stock engines and mild upgrades can utilize the MAF sensor with excellent overall results. However, in big-build and motorsports applications where power levels are extremely high and intake airflow configurations are less standardized, the use of a MAF sensor can be limiting.

Speed Density tuning using the Subaru factory ECU is a major break-through for high-power Subaru builds. High-power builds using the OEM MAF sensor require very large MAF intake housings to keep the MAF sensor within its usable range, which introduces reduced resolution and unpredictable turbulence that can affect tunability and drivability. Eliminating the need for a very large, high-quality MAF intake housing, Speed Density tuning logic allows for more flexibility when designing a turbo kit and the associated piping and plumbing. Speed Density tuning gives precise control over fueling, timing and other critical tuning components necessary to properly calibrate the vehicle at the very high power levels that today's big Subaru builds are capable of producing.

Hybrid Logic - Ultimate Flexibility
The Speed Density update for AccessTUNER Race software offers multiple ECU control modes to give the enthusiast-tuner and AccessPORT user a wider choice of engine modifications and tuning options. The software can program the ECU to run in the traditional pure MAF mode, a pure “Speed Density” mode, or a Hybrid Mode which uses both MAF and “Speed Density” with dynamic logic switching between the two.

Ease of Conversion
In order to make the transition to Speed Density as painless as possible, COBB Tuning has streamlined the process within the AccessTUNER software. Simply open an existing MAF-based calibration using the new Speed Density enabled software and resave the map. All of the tables from the MAF-based calibration will be loaded into the Speed Density based calibration. You are now ready to start tuning the Volumetric Efficiency (VE) table without the need of starting a new calibration from scratch!

Proven Performance
COBB Tuning's Speed Density for 2.5L Subarus has already proven capable of tuning big-power Subaru engines. The LIC Motorsports 2004 Subaru STI Time Attack race car claimed the Modified AWD class victory and set a new Modified AWD class record at the Infineon Raceway Global Time Attack 2011 season finale using the AccessPORT and Speed Density tuning. More information about this performance is available HERE.

Speed Density Availability
This release of Speed Density brings the same MAP-based tuning capabilities enjoyed by professional tuning shops to enthusiast-tuners using AccessTUNER Race software. “Off-The-Shelf” maps will not be made available for Speed Density as custom calibration specific to each vehicle is required.

Currently, the following USDM 2.5L turbocharged Subaru vehicles are supported:
We are in the process of investigating the feasibility of implementing Speed Density on 2.0L turbocharged Subaru vehicles. More information on this will be available soon.

To prepare your AccessPORT and AccessTUNER software for Speed Density tuning, simply follow these steps:
We are very excited to bring this capability to our self-tuners through AccessTUNER Race. We have combined our proprietary Speed Density logic with the flexibility of Hybrid Mode dynamic logic switching, the convenience of the AccessPORT’s Realtime tuning capabilities and the sophistication inherent in the factory ECU, bringing a powerful and unique solution to meet a large and long-standing demand in the Subaru enthusiast community. We would like to thank you for your patience and want to hear your feedback regarding Speed Density on your Subaru!
To learn more about our implementation of Speed Density, please download the Subaru 2.5L Speed Density Tuning Guide. If questions about tuning with the AccessPORT and Speed Density, or any other COBB Tuning products, please give us a call at 866-922-3059.
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Last edited by Cobb Tuning; 02-08-2012 at 08:09 PM.
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Old 02-09-2012, 11:58 AM   #2
Scooby Specialist
Member#: 108089
Join Date: Feb 2006
Chapter/Region: MWSOC
Location: Minnesota
2003 WRX
NF Performance


Love you long time
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Old 02-09-2012, 12:03 PM   #3
Scooby Guru
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Location: SC
07 FPgreen [email protected]
WRX VF39+E85 12.0, 121mph


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Old 02-09-2012, 01:11 PM   #4
Scooby Newbie
Member#: 156326
Join Date: Aug 2007
Chapter/Region: South East
Location: Mobile
2011 RA
03 bugiftw for the track


Awesome update, especially with the CANBUS ecus. Any chance of a CEL knock flash with future updates?
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Old 02-09-2012, 01:29 PM   #5
Scooby Newbie
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Join Date: Sep 2011
Chapter/Region: Tri-State
Location: Kenilworth, NJ
2011 STI


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Old 02-14-2012, 07:12 PM   #6
Scooby Newbie
Member#: 182487
Join Date: Jun 2008
Chapter/Region: BAIC
Location: bay area
04 STI


how is everyone liking the new speed density setup? i am debating to switch mine over from maf due to possible contamination that can cause the maf to give false readings.

curious if it is a smoother power, more manageable for tuners, or what the biggest difference people are seeing.
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Old 02-14-2012, 10:28 PM   #7
Scooby Specialist
Member#: 85036
Join Date: Apr 2005
Chapter/Region: MWSOC
2013 PBP sti ltd
05 LGT 35r 30psi..busted


:ban ana:

That about sums it up

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Old 02-22-2012, 04:04 PM   #8
Scooby Specialist
Member#: 56754
Join Date: Mar 2004
Chapter/Region: NESIC
Location: Mass
2004 Hybrid 2.5XTR
RIP [email protected]


I hope you guys can make it work for us 16 bit ecu guys.
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