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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's1 Bar SD custom OS available on most 99+ LS1 based PCM's2 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:
    Single Vehicle VCM Enhancement License: 2 Credits
    This allows you to apply an unlimited number of VCM Enhancements to this single vehicle license.

    Unlimited Vehicle Group VCM Enhancement License: 20 Credits
    This allows you to apply any VCM Enhancement to vehicles that fall under this vehicle group.

    If you license any Unlimited Vehicle Group (the base license), you will automatically receive the unlimited VCM Enhancement license for that vehicle group as well.

    *note all pricing is for USB MPVI customers ONLY.
    Last edited by Bill@HPTuners; 07-28-2012 at 09:47 AM.