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Thread: Datalog File Name

  1. #1

    Default Datalog File Name

    Please help decipher how Holley names it's datalog files. I found some posts on this, but it doesn't seem to mirror my file names. Thanks.

  2. #2


    It looks like you are running V5 EFI software and using the internal datalogging feature. Check out this document here: V5 Build 171 Updates.pdf. Scroll down the document to "Internal Data Logging Updates" and there you'll get an explanation. Assuming you have synced your ECU time, your datalogs were recorded on the 20th of the month, at 10:58:37 PM and 5:49:13 PM. Hope this answers your question, Steve.

    Here's an excerpt from the Holley document: Internal Datalog Time/Date file naming structure changed from MMDDHHMM to DDHHMMSS (Day/Hour/Minute/Second). What this means is that the “Log Time” can be set to seconds (for example 10 seconds) and subsequently recorded datalogs will not overwrite each other, compared to previous versions which recorded to the minute, where the datalogs needed to be 60 seconds or greater to ensure they were never overwritten. However, the “month” designation is gone so it is recommended to clear out datalogs monthly to avoid confusion.
    Last edited by steve392; 08-15-2020 at 07:32 AM.

  3. #3


    Thank you!

  4. #4


    Yeah, it's one of those things that doesn't make any sense until you understand it and then it makes perfect sense. If your ECU time is correct then you should notice that the first two digits are the day of the month. The next digits can be confusing unless you're working on the car before noon. If you run a datalog before noon, then you'll notice that it's 9am or 10am. If you run a datalog after lunch you won't recognize the time stamp unless you had been in the military and you know what sixteen hundred hours is.

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