Diagnosing a pull
Start with the datalog analyzer. Review boost versus target, timing corrections, AFR/lambda, fuel pressure, trims, and IAT together.
Engine & calibration
Engine & Tuning Tools
Plan airflow and fueling, interpret dyno numbers, and inspect datalogs without uploading your files to a third party.
Decision guide
Start with the job you need to do
Planning a power goal
Estimate injector demand and pressure ratio before choosing hardware. Keep duty-cycle, BSFC, fuel, and altitude assumptions visible.
Checking dyno claims
Normalize for weather, compare wheel and implied crank power, and cross-check the result against trap speed and displacement.
Calculators & references
Tools in this category
Datalog Analyzer
Analyze MHD, bootmod3, JB4, and EcuTek CSV logs locally for boost, timing, fueling, and heat issues.
Private analysisTurbo Pressure Ratio
Convert boost to compressor pressure ratio with elevation-corrected atmospheric pressure.
Forced inductionFuel Injector Sizing
Estimate the injector flow required for a power target using BSFC, duty cycle, and cylinder count.
Fuel systemCompression Ratio
Calculate static compression ratio from bore, stroke, chamber, gasket, deck, and piston volume.
Engine buildAFR & Lambda
Convert AFR and lambda for gasoline, ethanol blends, methanol, and diesel.
TuningDyno Correction Factor
Normalize power between weather conditions using SAE or STD correction math.
Dyno mathDyno Sheet Interpreter
Cross-check wheel power, implied crank power, trap speed, and output per liter.
Sanity checkHorsepower ↔ Torque
Convert horsepower and torque at any RPM and understand where the curves cross.
Power mathGood tuning decisions come from connected signals
No single log channel proves that a tune is healthy. Boost error can come from control strategy, airflow, a leak, or sensor scaling. Timing corrections can reflect fuel quality, temperature, load transitions, or mechanical noise. Fuel pressure, trims, lambda, throttle, RPM, and temperature provide the context needed to avoid chasing one dramatic-looking line.
These tools are designed for screening and planning. The datalog analyzer finds wide-open-throttle pulls, highlights the worst moments, and explains which related channels support or weaken a diagnosis. The sizing calculators make their assumptions explicit so you can change BSFC, duty cycle, fuel, or atmospheric pressure instead of relying on a mystery recommendation.
Treat every result as a conversation starter with the person responsible for the calibration or build. Do not use a general-purpose calculator to override a tuner, engine builder, fuel-system manufacturer, or factory safety limit.
Methodology and responsibility
Formulas, assumptions, and limitations are shown on the individual tool pages. TunerBench is maintained as an educational planning resource. Verify safety-critical specifications with the vehicle or component manufacturer and the professional responsible for the work.
Reviewed August 11, 2026 · How TunerBench verifies calculations · Report an issue
Common questions
Are uploaded datalogs stored?
No. CSV parsing and analysis run in your browser; the log is not uploaded to TunerBench.
Can a calculator tell me how much boost is safe?
No. Safe boost depends on the engine, turbo, fuel, calibration, temperature, and hardware condition. Pressure ratio only describes the compressor operating point.
Should I size injectors exactly to the calculated minimum?
Usually no. The result is a minimum based on assumptions. Leave headroom for fuel variation, rising demand, system pressure, and a conservative maximum duty cycle.
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