Power reading troubleshooting

Power reading too low

  • Worn out engine
  • Poor quality fuel
  • Faulty engine control – error codes active
  • High intake air temperature
  • Run too short for turbocharger to spool up
  • False advertising on performance parts power gain
  • Moment of inertia calibration too low
    • SETTINGS / Roller / Connected inertia
    • PROJECT / Eng. inertia
    • PROJECT / DT. inertia
  • Power transfer efficiency corrections too low
    • SETTINGS / General / Loss from load factor
    • PROJECT / DT loss factor
  • Improper load cell calibration
  • Coastdown losses not measured or not calculated

Power reading too high

  • Vehicle left in gear on coastdown losses measurement or brake pedal pressed on coastdown
  • Faulty engine control – turbocharger pressure too high
  • Moment of inertia calibration too high
  • Power transfer efficiency corrections too high
  • Improper load cell calibration
  • Internal loss model for dyno or rollers set too high

Inconsistent power reading

  • Faulty engine control
  • Engine control corrections kicking in due to high temperatures or knocking
    • Boost pressure reduction
    • Ignition angle retardation
  • Wheel slippage or wheel losing contact with one of the twin rollers
  • Leak in the intake air system with supercharger / turbocharger

Different power readings on different gears

  • Incorrect or skipped engine moment of inertia correction in PROJECT / Eng. inertia
  • Different gearbox efficiency in different gears. Some gearboxes have direct 1:1 drive in 4th or 5th gear, where the efficiency is higher than in other gears.