![]() Hybrid mode allows for switching between MAF and SD mode (and vice versa) based on thresholds of throttle, RPM, MAP and MAF voltage. SD mode is full-time SD operation where the ECU uses the SD-based load calculation. This mode allows you to get a starting VE table up and running before actually running SD or allows you to tune the MAF sensor calibration as you would with the factory ECU. MAF mode mimics the factory logic in which load is determined by the MAF sensor, "MAF Calibration" table, and RPM. Tuners can select from three different real-time tunable modes of operation.SD load compensations for engine coolant temp (ECT) and barometric pressure are also available. This table can be tweaked according to manifold pressure, allowing for changes that may be needed based on IAT sensor placement. An intake air temperature (IAT) compensation table allows the tuner to tweak the SD charge temperature correction.Because the VE table units represent actual VE, properly calibrated SD tunes can be used to compare VE across different cars with different mods, even if the SD load is drastically different. Tuning SD is achieved through manipulating a real-time tunable volumetric efficiency (VE) table.This keeps much of the existing factory logic in place, allowing for the safe and reliable operation of the factory ECU while reducing the learning curve associated with tuning SD. SD works by calculating a new SD-based engine load to replace the factory MAF sensor-based engine load when SD is active.The following is a list of the key features of COBB Speed Density (SD): WBO2 Sensor = Wideband Oxygen Sensor Features.RPM = Revolutions Per Minute (referring to engine speed).2002-2005 Subaru Impreza WRX (Manual Transmission) Glossary of Acronyms.This guide covers the following vehicles designed for and sold in North America: Or SD can be used on the low end to improve idle/cruise characteristics when a big MAF is used, while still retaining MAF sensor operation on the high end. In a special hybrid mode, SD can be used on the high end to overcome a maxed out MAF sensor, while still retaining MAF sensor operation on the low end. ![]() SD allows for the MAF sensor to be removed, eliminating a potential restriction in the intake tract and allowing for more freedom in intake piping design.SD can eliminate the noisy airflow calculation sometimes seen when using a MAF sensor based configuration with heavily modified cars.UsesĬOBB Speed Density (SD) has a number of potential uses that can improve the tuning capability for particular setups: It is highly customizable and features such as real-time tuning aid in a speedy and efficient tuning process. The COBB Speed Density feature is a powerful yet easy-to-use solution that integrates Speed Density tuning into the Subaru engine control unit (ECU) and can be used to entirely replace or work in conjunction with the existing factory mass airflow (MAF) sensor. For information pertaining to the 2.5L USDM Subarus, please see our Subaru Speed Density Guide: 2.5L. ![]() Note: This guide covers COBB Speed Density for the 02-05 USDM 2.0L WRX. ![]()
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