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Thread: Custom OS's & Their Differences

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    Question Custom OS's & Their Differences

    1 Bar MAF custom OS available on most 99+ LS1 based PCM's

    1 Bar SD custom OS available on most 99+ LS1 based PCM's

    2 Bar SD custom OS available on most 97-07+ LS1 based PCM's
    • 2 bar MAP sensor support (calibration capability for GM 0-5V linear MAP sensors)
    • Extended Main VE table to 210kPa (2bar)
    • Retains full 5 kPa resolution in non-boost regions (most calibrations)
    • 5 kPa resolution in boost regions (most calibrations)
    • secondary VE table not used (if applicable)
    • New MAP referenced "Boost Enrich" table
    • New openloop MAP threshold
    • Dual (High and Low Octane) Spark table support
    • Speed Density mode only
    • VCM Scanner histogram automatically recognizes and adjusts for 2bar feature (if applicable)
    • New 2bar MAP PID for VCM Scanner (if applicable)
    • Adds RTT http://www.hptuners.com/help/vcm_editor_rtt.htm (most calibrations)

    3 bar SD custom OS available on most 99+ LS1 based PCM's
    • 3bar MAP sensor support (calibration capability for GM 0-5V linear MAP sensors)
    • Extended Main VE table to 315kPa (2bar)
    • Retains full 5 kPa resolution in non-boost regions (most calibrations)
    • 5 kPa resolution in boost regions (most calibrations)
    • secondary VE table not used (if applicable)
    • New MAP referenced "Boost Enrich" table
    • New openloop MAP threshold
    • Dual (High and Low Octane) Spark table support
    • Speed Density mode only
    • VCM Scanner histogram automatically recognizes and adjusts for 2bar feature (if applicable)
    • New 3bar MAP PID for VCM Scanner (if applicable)
    • Adds RTT http://www.hptuners.com/help/vcm_editor_rtt.htm (most calibrations)

    2.5 Bar MAP - Speed Density (LS2 V8 - E40 ECM) This enhancement contains the following features:
    • 2 bar or 2.5 bar MAP sensor support (calibration capability for GM 0-5V linear MAP sensors)
    • New Boost VE table from 105 kPa to 255 kPa (2.5 bar or 22.5 psi boost)
    • Retains stock VE table resolution in non-boost regions
    • better than 5 kPa resolution in boost regions (105 kPa - 255 kPa)
    • New MAP referenced "Boost Enrich" table in 5 kPa increments
    • New Boost Enrich MAP threshold
    • Speed Density mode only
    • Rescaled fan temperature axis 163-250F (73-121C), stock is 192-250F (89-121C)
    • VCM Scanner histogram for Boost VE table included in histogram library

    2.5 Bar MAP - Speed Density (E38/E67 ECM)This enhancement contains the following features:
    • 2.5 bar (255 kPa) max MAP sensor support (calibration capability for GM 0-5V linear MAP sensors)
    • Rescaled High MAF table supports up to 15400 Hz with 300 Hz resolution, also supports airflow up to 1024 g/sec
    • New VE tables with 33 x 33 cell resolution each and configurable MAP and RPM axes (choose your own resolution)
    • Charge Temperature based VE multiplier table, configurable axis
    • TPS based VE multiplier table, 33 x 17 cells with configurable TPS and RPM axes
    • MAP referenced "Boost Enrich" table
    • Boost Enrich MAP threshold and hysteresis value
    • Both MAF and Speed Density mode supported
    • Boost based fuel cut, selectable MAP threshold cuts fuel to all cylinders when exceeded
    • Rescaled fan temperature axis 163-250F (73-121C), stock is 192-250F (89-121C)

    Would there be any advantage of using a 2 or 3 bar Custom OS on a Naturally Aspirated Engine?
    In most cases, no. Our 1 bar SD Custom OS's not only rid you of your secondary VE table,gives you RTT for most OS's, gives functionality to both the High/Low octane tables but also add a TPS vs. RPM multiplyer. The ONLY advantage a 2 bar MIGHT give you is slightly more resolution on the primary VE table which in most cases isnt enough to justify the added work & credits involved. The only time I might recommend the 2 bar in an NA application is for 98's because of the fact that there are no 1 bar custom OS's available currently & the 2 bar does get rid of the secondary VE & gives you functionality of both the High/Low octane tables.


    Pricing:

    Free in the newest 3.x software
    Last edited by Bill@HPTuners; 3 Days Ago at 10:02 PM.