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01-16-2012, 12:22 PM | #1 |
NASIOC Vendor
Member#: 4803
Join Date: Mar 2001
Location: Austin, TX
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COBB AccessPORT Supports Speed Density on 2.5L Turbocharged Subaru Vehicles
COBB Tuning is proud to announce the immediate availability of our 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 Pro 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 using 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 Pro software offers multiple ECU control modes to give the professional 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! Speed Density Availability This initial release of Speed Density is available for professional tuning shops using AccessTUNER Pro software for turbocharged Subaru USDM vehicles. Speed Density for AccessTUNER Race is currently in development and will be made available to self-tuners once development and testing is completed. “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 have your vehicle tuned using Speed Density logic, simply follow these steps:
It took us quite a bit longer than anticipated to develop Speed Density for all USDM 2.5L turbocharged Subaru vehicles, but now that it is complete, we are very excited about this release. 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 you are interested in becoming a new Subaru ProTUNER capable of tuning customer vehicles with Speed Density, please give us a call at 866-922-3059.
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01-16-2012, 01:34 PM | #2 |
Scooby Newbie
Member#: 304696
Join Date: Dec 2011
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Sooooo Awesome!
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01-16-2012, 02:29 PM | #3 |
Scooby Specialist
Member#: 75414
Join Date: Nov 2004
Chapter/Region:
RMIC
Location: Rock Springs,Wyoming
Vehicle:2004 STi Its the Blue one |
So whats the biggest downside to running straight SD?
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01-16-2012, 02:56 PM | #4 |
Scooby Newbie
Member#: 99072
Join Date: Oct 2005
Location: HOU TX
Vehicle:2010 Forester XT |
Been waiting for this! Way to go COBB!
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01-16-2012, 03:22 PM | #5 |
Scooby Specialist
Member#: 243992
Join Date: Apr 2010
Chapter/Region:
MWSOC
Location: Morton Grove, Illinois
Vehicle:2006 WRX TR WRB |
YES, finally!!! time to call up clark turner
only downside i can find so far of straight SD. POTENTIAL RISKS FOR SD WITH A HEAT SOAKED IAT SENSOR Any SD calculation, including COBB SD, requires an input for cylinder charge temperature, which is critical to the determination of accurate airflow via SD. The estimation of cylinder change temperature is accomplished for COBB SD via the IAT sensor input. Generally, when the IAT sensor is in the recommended location (post-IC), the vehicle is moving and the driver is on the throttle, the IAT input can be a fairly reliable representation of actual cylinder charge temp. However, when the vehicle is sitting still (or at low speeds) and the driver is off the throttle (or low throttle), or the vehicle has been sitting with the engine off and a hot engine bay for a period of time, there is the potential for the IAT sensor to become heat soaked. That is, the sensor now reads higher than the actual intake air temp. When SD is active, this would cause the calculated SD airflow (as well as load) to be lower than it should be, causing the car to run lean (and with generally more timing advance). This effect may subside after the vehicle gets moving and throttle (as well as MAP) increases, but it will generally not be an instantaneous improvement. As such, it is critical that the owner/driver of the car understands the specific scenarios in which a heat soaked IAT sensor can potentially occur and to avoid putting the car under high load when these scenarios are present (and for a period shortly after). This is another reason why a wideband o2 sensor and gauge should be installed in the car and that the driver instructed on how to determine when fueling is incorrect. ***8226; The owner of the car also needs to understand that practically any engine mod that impacts airflow in any way may require a re-tune or tweaking of the VE table for cars running SD. This is important as even seemingly minor mods that a MAF sensor-based tune would have no problem accounting for, might cause a significant enough change in VE that there could be fueling and load issues for SD. Last edited by WhatTurboLag?; 01-16-2012 at 03:46 PM. |
01-16-2012, 03:29 PM | #6 |
Scooby Specialist
Member#: 8356
Join Date: Jul 2001
Chapter/Region:
MAIC
Vehicle:02 STi swap 12 WRX limited |
SD, so crisp and clean!
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01-16-2012, 04:14 PM | #7 |
Scooby Newbie
Member#: 291154
Join Date: Aug 2011
Chapter/Region:
MWSOC
Location: Denmark, WI
Vehicle:2004 STi WRB |
Awesome. Pure awesome. Now it just needs support for ATR...
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01-16-2012, 05:17 PM | #8 |
Scooby Specialist
Member#: 146168
Join Date: Apr 2007
Location: South Florida
Vehicle:2017 Impreza |
Very interesting!
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01-16-2012, 05:27 PM | #9 |
Scooby Newbie
Member#: 280598
Join Date: Apr 2011
Chapter/Region:
MAIC
Location: MD
Vehicle:05 STi CGM |
awesomeness. Been waiting for this from cobb for a while!
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01-16-2012, 09:20 PM | #10 |
Scooby Specialist
Member#: 86741
Join Date: May 2005
Chapter/Region:
MWSOC
Location: Chicago
Vehicle:05 STi.. Built twinscroll35r Love/Hate |
Awesome!!!!!!!!!!! Can't wait for my retune!
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01-17-2012, 01:06 AM | #11 |
Scooby Specialist
Member#: 89752
Join Date: Jun 2005
Chapter/Region:
SCIC
Location: On the dyno at Yimi Sport
Vehicle:08 STI SWP |
Cobb SD is badda$$! Played around with it on my own car today and I have perfect idle/cruise/mid load drivability and fueling with only about 30-45 mins of tuning the VE map and a couple comp tables. Have to find some time between customer tunes to get my car on the dyno and verify that the higher load sections but that should be even quicker.
Big thumbs up here |
01-17-2012, 08:07 AM | #12 | ||
Scooby Specialist
Member#: 146168
Join Date: Apr 2007
Location: South Florida
Vehicle:2017 Impreza |
From reading the guide's hardware requirements I have 2 questions:
Quote:
Quote:
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01-17-2012, 09:30 AM | #13 | |
Scooby Specialist
Member#: 35076
Join Date: Apr 2003
Chapter/Region:
TXIC
Location: Austin/Round Rock
Vehicle:2004 507whp Wagon Silver |
Quote:
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01-17-2012, 10:01 AM | #14 | |
NASIOC Vendor
Member#: 4803
Join Date: Mar 2001
Location: Austin, TX
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Quote:
All cars using SD should be running a wideband o2 sensor with in-car gauge. That is really a no-brainer and even cars still running MAF at power levels that would benefit from SD should have this set-up anyway. Bill |
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01-17-2012, 11:52 AM | #15 |
Scooby Specialist
Member#: 243992
Join Date: Apr 2010
Chapter/Region:
MWSOC
Location: Morton Grove, Illinois
Vehicle:2006 WRX TR WRB |
I was going to try to tap the throttle body or on the intake manifold since I am running a tmic for now
Also, since I cant imagine my car ever seeing more than 20 psi (even when rotated) I planned on using the stock map sensor unless the tunes wants it. |
01-17-2012, 12:26 PM | #16 | |
NASIOC Vendor
Member#: 4803
Join Date: Mar 2001
Location: Austin, TX
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Quote:
Cheers Lance |
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01-17-2012, 04:46 PM | #17 |
Former Vendor
Member#: 227509
Join Date: Oct 2009
Chapter/Region:
South East
Location: Marietta, GA
Vehicle:2015 Subaru STi Galaxy Blue |
This is excellent news! We're very excited
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01-17-2012, 10:03 PM | #18 |
Scooby Specialist
Member#: 243992
Join Date: Apr 2010
Chapter/Region:
MWSOC
Location: Morton Grove, Illinois
Vehicle:2006 WRX TR WRB |
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01-18-2012, 09:05 AM | #19 |
Scooby Specialist
Member#: 285083
Join Date: Jun 2011
Chapter/Region:
MAIC
Location: Newport News, VA
Vehicle:2006 STi WRB |
Can you use the stock map sensor for pure SD tuning? as long as your running under 23psi of course?
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01-18-2012, 09:16 AM | #20 | |
NASIOC Vendor
Member#: 4803
Join Date: Mar 2001
Location: Austin, TX
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Quote:
Bill |
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01-18-2012, 11:29 AM | #21 |
Scooby Specialist
Member#: 243992
Join Date: Apr 2010
Chapter/Region:
MWSOC
Location: Morton Grove, Illinois
Vehicle:2006 WRX TR WRB |
I'm planning on using the stock map sensor but i plan on never going past 20psi on a vf39
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01-18-2012, 01:32 PM | #22 | |
NASIOC Vendor
Member#: 4803
Join Date: Mar 2001
Location: Austin, TX
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Quote:
Bill |
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01-18-2012, 08:59 PM | #23 |
Scooby Guru
Member#: 195711
Join Date: Nov 2008
Chapter/Region:
MWSOC
Location: Lapeer MI
Vehicle:PART OUT. PM ME 02-07 Goodies |
DAY MADE. So happy!
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01-19-2012, 04:22 PM | #24 |
Former Vendor
Member#: 112508
Join Date: Apr 2006
Location: Easton, PA
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Im going to be the one to say it.. Even tho I can't wait to try it out Im pretty upset that the Utec which is an outdated ems has been using this type of feature for over 5 years..
Why did it take so long to catch up to a dinosaur? |
01-19-2012, 04:31 PM | #25 |
Scooby Newbie
Member#: 150484
Join Date: Jun 2007
Chapter/Region:
Tri-State
Location: BANGOR PA
Vehicle:2000 RShybrid35rPPG SRP |
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