Accessport Flash Explanation

Fast vs. Slow Flashing explanation by Trey

Applicable Vehicle:

  • All Supported GT-Rs

"Think of the ECU as a neighborhood of houses. Each table/parameter has its own street address. Whenever you make a change to any table/parameter, the ECU has to knock down ALL the houses on that street and rebuild all the houses, including the one that contained the change you wanted to make.

For the GT-R ECU, the neighborhood has 16 streets. Fortunately most of the tables/parameter that are changed for tuning are all located on the same street. So when we make one or many changes to the houses on the same street, the time to rebuild (flash) is the same. However there are some changes that can be made in TUNER that will require other streets to be torn down and rebuilt.

When you flash the ECU, the AP will compare the new blueprints (map data) to what is already built in the neighborhood. If any differences are found on any street, it is knocked down and rebuilt. The more streets that have to be rebuilt, the longer the flash time. And unfortunately we can't just move everything to the same street. The neighborhood (ECU) is constrained for size so only so many houses (map data) can fit on a single street.

Every year model is slightly different so it is hard to say exactly which tables/parameters are going to require a longer flash. It also greatly depends on what is being changed (difference between what is on the ECU currently versus the map data). Some parameters like the Toggles (MAF Swap, 5 Bar MAP limit, etc) may increase flash time because they are located on different streets from tuning data. Also any maps that have different custom features (BOTL map vs a map without the BOTL feature) will increase flash time, for the same reason."

-Trey Cobb


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