Data Logging & Analysis
MegaLogViewer, from EFI Analytics, is the datalog-analysis companion to TunerStudio for MegaSquirt and other MS/Speeduino-compatible ECUs. It opens recorded datalogs and lets tuners graph and scrutinise channels — RPM, load, AFR/lambda, spark, coolant and more — scrub through runs, and identify where a calibration needs work. Its VE Analyze-style features help translate observed AFR error into suggested VE-table corrections, streamlining iterative tuning. MegaLogViewer is widely used alongside TunerStudio in the DIY and enthusiast standalone-ECU community, turning raw logs into actionable map changes. It reads and analyses logged data from standalone aftermarket ECUs rather than writing to or reflashing an OEM control unit.
MegaLogViewer analyses logs from standalone ECUs and has no OEM-firmware role, so it is unrelated to Softechpro; the two serve different tuning ecosystems entirely.
See Softechpro plansTry the file service