1 Bar MAF custom OS
Available on most 99+ LS1 based PCMs.
| ￭ | Adds RTT to the stock calibration. |
1 Bar SD custom OS
Available on most 99+ LS1 based PCMs.
| ￭ | 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). |
2 Bar SD custom OS
Available on most 97-07+ LS1 based PCMs.
| ￭ | 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) |
3 bar SD custom OS
Available on most 99+ LS1 based PCMs.
| ￭ | 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 openloop 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) |
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 one-bar SD Custom OS's rid you of your secondary VE table, give you RTT for most OS's, offer functionality to both the high/low octane tables, and add a TPS vs. RPM multiplier. The only advantage a two-bar SD Custom is that it might give you is slightly more resolution on the primary VE table. However, in most cases this isn't worth the extra time and effort.
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