Operating System Enhancements with RTT

VCM Suite can apply operating system enhancements that add RTT to many vehicles that have an LS1 engine from GM. If your vehicle supports these enhancements, you will see them listed on the OS tab in VCM Editor.

Details for these custom operating systems are included below. See Applying a Custom OS with RTT for instructions on applying any of these custom operating systems to your vehicle.

1bar MAF Enhanced (GM GenIII V8)

Available on most vehicles with 1999+ LS1 engines, this enhancement adds RTT to the stock calibration.

1bar Speed Density Enhanced (GenIII V8)

Available on most vehicles with 1999+ LS1 engines, this enhancement contains the following features:

￭ Adds a VE Multiplier vs. TPS vs. RPM table
￭ Secondary VE table not used (if applicable)
￭ Speed Density Mode Only
￭ Dual (High and Low Octane) Spark table support
￭ Adds RTT (most calibrations)

2bar MAP - Speed Density (GenIII V8)

Available on most vehicles with 1997-2007 LS1 engines, this enhancement contains the following features:

￭ 2 bar MAP sensor support (calibration capability for GM 0-5V linear MAP sensors)
￭ Extended Main VE table to 210 kPa (2 bar)
￭ 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 open-loop MAP threshold
￭ Dual (High and Low Octane) Spark table support
￭ Speed Density mode only
￭ VCM Scanner histogram automatically recognizes and adjusts for 2 bar feature (if applicable)
￭ New 2 bar MAP PID for VCM Scanner (if applicable)
￭ Adds RTT (most calibrations)

NOTE: You must use a correctly calibrated 2bar MAP sensor for this application. The default MAP sensor calibration values may not be accurate for your MAP sensor.

3bar MAP - Speed Density (GenIII V8)

Available on most vehicles with 1999+ LS1 engines, this enhancement contains the following features:

￭ 3 bar MAP sensor support (calibration capability for GM 0-5V linear MAP sensors)
￭ Extended Main VE table to 315 kPa (2 bar)
￭ 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 open loop MAP threshold
￭ Dual (High and Low Octane) Spark table support
￭ Speed density mode only
￭ VCM Scanner histogram automatically recognizes and adjusts for 2 bar feature (if applicable)
￭ New 3 bar MAP PID for VCM Scanner (if applicable)
￭ Adds RTT (most calibrations)

NOTE: You must use a correctly calibrated 3bar MAP sensor for this application. The default MAP sensor calibration values may not be accurate for your MAP sensor.