Triple Black

I'm getting an engine exchange done in my 996 (to a slightly used 997 block).

What happens to the information stored by the DME when you do an engine exchange? Does it keep all the info (such as over revs) on the old engine and then append it with the info on the new engine? Does it reset? Or, does the new engine's DME info port over?

Ahsai

Unless someone reprograms it, the DME cannot tell one engine from another. It only sees the same sensors and actuators on the new engine. In other words, the old DME info on the engine will continue to be updated as if the engine was never replaced.

Triple Black

Makes sense. Thanks Ahsai!

Macster

Hope that 997 transplant is compatible with the existing population of sensors and the 996 engine controller.

Triple Black

Guess we'll find out soon. Keeping my fingers crossed, but I'm sure my mechanic knows what he is doing.

Triple Black

Yup. It works!

Flat6 Innovations

The DME doesn't know the engine has been changed. Because of that all stored info is there and the only way to remove it is to exchange the DME and reprogram it.

But its imperative that when the new engine is installed that the ECU is cleared with a "handover" or whats sometimes called a "system reset".

If this isn't done, the adaptive and etc may have adjusted to the failing engine, and will enrich the new one in the same manner. That can cause issues.


When we install an engine, we perform a system reset before the new engine is even started the first time. We want the adaptation process to occur as fast as possible with the new engines and for none of the old fuel trim and etc to remain in the DME.