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#Dyno tune vs ecu flash software#
Adjusting the vehicle’s software whilst on a rolling road (chassis dyno) is physically impossible (with the rare exception of specialised piggyback ECUs or emulators) and can only be carried out when the vehicle is stationary with the engine not running, however, I often see misleading marketing that suggests otherwise.Ī chassis dyno (rolling road), is simply a device used for measuring the power output (specifically force, torque or horsepower) from an engine, it’s essential when developing a true custom tune for a vehicle and can take several days to do so, during this time they would also be data logging air-fuel ratios, engine knock, boost, exhaust gas temperatures and so on.īUT this is very specialist work and very few companies actually do custom tunes regardless of if they have a dyno or not. Let’s, first of all, dispel some myths about dyno tuning, when it comes to a production car with a standard ECU (Engine Control Unit) there is no such thing as live tuning, a live remap, or even dyno tuning whilst the vehicle is running.