Tuningkit or OBD
Performance improvement for diesel and gasoline engines:
The maximum available engine performance of a modern diesel or gasoline engine is significantly higher than the output made available by the vehicle manufacturer.
There are several reasons for this:
- Maintaining performance reserves for future vehicle facelifts
- Compliance with maximum allowable exhaust gas thresholds
- The manufacturer’s product strategies (a small engine cannot attain the performance of the premium model)
- The manufacturer’s sales strategy, e.g.: fleet customers buy a maximum 150 bhp rating for field sales reps, because fleet insurance carriers typically only offer two premium groups (vehicles up to 150 bhp and vehicles greater than 150 bhp).
On modern common rail and turbo gasoline engines, the engine output is defined by the software of the motor control unit.
To increase engine performance, the original motor control unit can be reprogrammed and the performance limit set by the manufacturer can either be increased or deactivated.
The second option involves installing a second user programmable engine control into the vehicle, which also increases the performance limits.
Performance improvements by installing an add-on unit, such as Tuningkit:
The latest generation add-on devices provide a technically equivalent alternative to direct performance improvements.
The manufacturer of the add-on device uses test vehicles to measure all data relevant for engine performance, such as: fuel injection volume and boost pressure. The engine components are subsequently analyzed for their functionality. Hardware is now developed that is compatible with these engine components.
The engine control parameters measured in lengthy test runs are used to program the newly developed hardware. The result is an operational secondary control unit that is compatible with the engine.
The end-user receives the fully programmed add-on control unit, including an adapter cable that is simply plugged into the vehicle. The add-on control unit works concurrently with the original control unit on the same engine sensors and actuators. However, the engine is operated with different parameters that generate the performance improvement.
The original manufacturer’s hardware is neither damaged nor modified. Only a few plug-in connections need to be installed on the vehicle, which are just as easily removed.
Performance increases by reprogramming the original engine control unit:
This involves 3 steps:
- Read-out of the original manufacturer software from the engine control unit
- Modification of the performance parameters on a PC, using special software. The fuel injection volume is increased, and the boost pressure required for a clean combustion is increased slightly. Additionally, the maximum speed limit intended by the vehicle manufacturer can also be deactivated
- Reprogramming of the motor control unit with the previously changed data
Until recently, reading from and writing to the motor control unit were relatively straightforward activities. Using a suitable read/programming unit, it was possible to do this conveniently via the diagnostics interface (OBD).
The latest generation control units (e.g. all diesels made by BMW or VW/Audi) no longer permit this exchange of data via OBD. The motor control unit must therefore be opened by force in order to read and write the data. Obviously, even a non-technical person can immediately see that the control unit has been manipulated based on the evidence left when the control unit cover was opened. This voids the manufacturer warranty for the vehicle.