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.