Interesting experience.... - 2017 Ford Fusion V6 Sport Forum
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post #1 of 3 (permalink) Old 08-23-2019, 05:11 PM Thread Starter
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Interesting experience....

I just started driving my 2017 FS again after re-claiming it from my wife, who drove it for about 10 months while I drove a company car. Before turning it over to her, I flashed an Unleashed 93 tune back to stock; she ran 87 octane while driving it. When I got back in the FS, I ran two tanks of 93 octane before reloading the 93 tune -- and it didn't feel like I remembered, not much different from stock. So, flashed back to stock, stayed on 93 octane, and tried again -- same result -- flashed back to stock again. A week later, did a 10 minute battery disconnect, then ran for another week on stock tune and 93 octane.

Last night, I flashed the Unleashed 93 tune again and didn't fire it up until this morning for my drive to work. I wasn't halfway down the street before I could tell it was back to the Unleashed 93 performance that I remembered -- the car feels very strong again, way better than stock. So, I'm wondering now if the battery disconnect cleared or re-set "something" and allowed Torrie's tune to load properly this time. I'll appreciate any insights on cause and effect here -- regardless, it's running great right now. Cheers!

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post #2 of 3 (permalink) Old 08-23-2019, 06:45 PM
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Thats strange, I have switched back to stock tune a few times when I brought it in to dealer, and when I flash it back I always felt the car transform to the high power level very quickly. If it took you resetting the ecu via battery disconnect your theory seems very plausible

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post #3 of 3 (permalink) Old 08-24-2019, 01:34 PM
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Originally Posted by RonBurgundy View Post
I just started driving my 2017 FS again after re-claiming it from my wife, who drove it for about 10 months while I drove a company car. Before turning it over to her, I flashed an Unleashed 93 tune back to stock; she ran 87 octane while driving it. When I got back in the FS, I ran two tanks of 93 octane before reloading the 93 tune -- and it didn't feel like I remembered, not much different from stock. So, flashed back to stock, stayed on 93 octane, and tried again -- same result -- flashed back to stock again. A week later, did a 10 minute battery disconnect, then ran for another week on stock tune and 93 octane.

Last night, I flashed the Unleashed 93 tune again and didn't fire it up until this morning for my drive to work. I wasn't halfway down the street before I could tell it was back to the Unleashed 93 performance that I remembered -- the car feels very strong again, way better than stock. So, I'm wondering now if the battery disconnect cleared or re-set "something" and allowed Torrie's tune to load properly this time. I'll appreciate any insights on cause and effect here -- regardless, it's running great right now. Cheers!

Nah, disconnecting the battery did not do anything. When a calibration is flashed into a PCM, it either takes or it doesn't and you would have gotten an error message if loading the calibration failed. Calibration changes are instant, so maybe you had crap gas or something else that was reducing power.
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