ECU logging allows ECU Engine and Vehicle data to be transferred into memory and then permanently stored. When required the data can then be downloaded from the ECU using Emtune so it can be analyzed. 


The ECU logging uses 2 types of memory for data storage.


1) RAM  (Volatile - ECU requires power to maintain the stored data)

2) Flash Memory (Non-volatile - Data is permanently stored)


Stage 1

The logging starts by first transferring data into a large high speed DDR RAM buffer. This can store up to 32MB of data.  RAM memory is volatile which means when the power is removed the data is lost. It is fast and has an unlimited number of Write(Store) and Read cycles.


Stage 2

As the RAM data can be lost when the ECU is powered down, the data must be periodically transfered into Flash Memory where is can be permanently stored. Flash memory has a limited number of write (Store) cycles which is why the data can only be stored periodically. The following condition(s) are used to control this storing:


  1. When a logging channel is ON, Data is transferred from RAM into Flash memory at approximately 30sec intervals.
  2. When a logging channel switches from ON to OFF all unstored data is transferred into Flash memory.
  3. When the ECU is controlling the Main EFI Relay and the ECU receives a request to shut down, the ECU will transfer all unstored data into Flash Memory before switching itself off. 


Logging rates can be selected from 1Hz up to 500Hz


Data can from transferred from ECU to PC at approximately 0.5MB/sec. So a 4MB log will take 8 seconds and a 16MB log will take 32 seconds.



Use the Runtime menu (F3) -> ECU Internal tab to view the Logging Status


NOTE: With 500 Hz Rate selected ONLY Dataset 1 is available for logging .