Megasquirt Field Dictionary

 
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There are 2 types of fields in MegaLogViewer.

Logged Fields: Time - Real time clock in 0.001 resolution.

SecL - Low byte of MS internal clock, rolls at 255 back to zero.

RPM - Revolutions Per Minute, RPM/100 on some MS1 embedded codes.

MAP - Manifold Absolute Pressure in kPa.

TP - Throttle Position in percent.

O2 - EGO sensor voltage.

MAT - Manifold Air Temperature in either F or C. Configure in tuning software.

CLT - Coolant Temperature in either F or C. Configure in tuning software.

Engine - Engine bits.

Gego - Gamma EGO in percent.

Gair - Gamma Air temperature in percent.

Gwarm - Warmup Enrichment Gamma in percent.

Gbaro - Barometric Correction Gamma in percent.

Gammae - Enrichment Gamma, product of all of the above gammas, in percent.

TPSacc - TP acceleration enrichment pulse in ms.

Gve - Gamma VE (table lookup value), for bank 1, in percent.

PW - Final pulsewidth, for bank 1, in ms.

Gve2 - Gamma VE (table lookup value), for bank 2, in percent.

PW2 - Final pulsewidth, for bank 2, in ms.

Calculated Fields:
  Wideband O2 AFR - Air Fuel Ratio calculated based on O2 field for specified WB sensor. This is for MS1 only, MS2 typically logs AFR directly to an afr field.

Wideband O2 Lambda - Lambda calculated based on O2 field for specified WB sensor. This is for MS1 only, MS2 typically logs Lambda directly.

Boost(psi) - Converts MAP to psi with 0 = to atmospheric pressure.
- Input: "Engine off MAP pressure in KPA" - The MAP value while the engine is not running, corrects for sea level and error.

VAC(inHg) - Converts MAP to vacuum in inHg
- Input: "Engine off MAP pressure in KPA" - The MAP value while the engine is not running, corrects for sea level and error.

Boost-Vac - Below atmospheric pressure Vacuum in inHg, above Boost in PSI
- Input: "Engine off MAP pressure in KPA" - The MAP value while the engine is not running, corrects for sea level and error.

TP ADC - Calculates the original ADC value based on TP in percentage.
     - Inputs:
     - "Maximum TPS ADC" - the ADC value with your throttle at wide open.
     - "Minimum TPS ADC" - the ADC value with your throttle in idle position

MPH\ Xxx\ Gear
     - Inputs:
     - "Tire Diameter(in.)" - Drive tire outside diameter in inches
     - "Final Drive Ratio" - Axle drive ratio
     - "Transmission gear ratio" - ratio for the transmission gear used

KPH\ Xxx\ Gear
     - Inputs:
     - "Tire Diameter(cm.)" - Drive tire outside diameter in centimeters
     - "Final Drive Ratio" - Axle drive ratio
     - "Transmission gear ratio" - ratio for the transmission gear used

HP - Horsepower calculated from rate of speed change. Car must be in the defined gear on level ground for accurate results. Currently uses US measurement units only.
     - Inputs:
     - "Min TP to calculate for" - Filter condition, HP will only be calculated when TP is over this value. This heavy calculation will slow log load times if hp is calculated for the entire file.
     - "Tire Diameter(in.)" - Drive tire outside diameter in centimeters
     - "Final Drive Ratio" - Axle drive ratio
     - "Transmission gear ratio" - ratio for the transmission gear used
     - "Converter stall speed (0 for manual trans)" - Converter flash stall, the RPM that you flash to from a stop with traction.

Fuel Flow - Total Fuel flow for combined injectors in lb/hr or cc/min depending on what rating is used for the injector input.
     - Inputs:
    - "Injector Opening Time" - the injector open time configured in you MS, usually 1.0
    - "Alternating(enter 0.5) or Simultaneous (enter 1)" - whether your injectors are configured to fire Simultaneously or alternating.
     - "Number of Squirts" - Number of squirts per cycle configured in your MS
     - "Injector Size" - the rated or corrected rating for your injector
     - "Number of Cylinders/Injectors" - Number of injectors.

Instant MPG - point in time fuel economy in Miles per gallon. Like the instant MPG gauge in many modern cars.
     - Inputs:
     - "Injector Opening Time" - the injector open time configured in you MS, usually 1.0
     - "Alternating(enter 0.5) or Simultaneous (enter 1)" - whether your injectors are configured to fire Simultaneously or alternating.
     - "Number of Squirts" - Number of squirts per cycle configured in your MS
     - "Injector Size" - the rated or corrected rating for your injector
     - "Number of Cylinders/Injectors" - Number of injectors.
     - "Tire Diameter(in.)" - Drive tire outside diameter in inches
     - "Final Drive Ratio" - Axle drive ratio
     - "Transmission gear ratio" - ratio for the transmission gear used, for Instant MPG usually your high gear. 1.0 in non overdrive transmission, less if overdrive equipped.

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