Switching tunes - Ford Powerstroke Diesel Forum
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post #1 of 28 Old 06-24-2012, 04:32 PM Thread Starter
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Switching tunes

Do I have to go back to stock to change tunes, or can I just select my tow tune, then go back to xtreme street when I'm done towing?

Also, should I drive it a few miles before hooking up and using the new tune. like going from xtreme street to tow, do I need to not tow for a while to give the transmission a chance to re-learn?

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post #2 of 28 Old 06-24-2012, 04:42 PM
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If the load isn't over 5k you really don't need to change tunes. Just keep your foot out of the gas and you will be fine. I tow my skid loader on my street tune and she does just fine @70 mph with cruz control

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post #3 of 28 Old 06-24-2012, 04:45 PM Thread Starter
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It's over 11,500lb 5th wheel.

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post #4 of 28 Old 06-24-2012, 04:47 PM
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I usually recommend you go back to stock prior to switching tunes if using a SCT simply because when you upload a custom tune, the SCT will save the tune on file as the OEM file. So if you have another custom tune on it currently and load a new custom tune, it will save the first tune as OEM.

But if you restore back to stock, then upload your new custom tune, you will still have your OEM tune.

Anybody correct me if I'm wrong but I believe that's how it works.
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post #5 of 28 Old 06-24-2012, 04:54 PM
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post #6 of 28 Old 06-24-2012, 06:04 PM
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It's recommended to return to stock before switching tunes. BUT myself and others switch from custom to custom without issues, been doing it since 2008. Its your call.

When I switch from a race tune to a tow tune, I like to switch a day ahead of time. Gives the trans a chance to relearn without having a heavy load on the motor. JMO.

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post #7 of 28 Old 06-24-2012, 06:08 PM
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I've also loaded the same custom tune directly twice. I was experimenting with Rev per mile setting, and just kept loading the same tune with different Rev per mile until I was happy.

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post #8 of 28 Old 06-24-2012, 06:11 PM
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That's true too. If you don't care about your OEM tune, you can just go from custom to custom. I doubt my car would even fire up with my factory tune. lol

And I've done the same, keep reloading the same one, adjusting my idle speed lower and lower until I settled on 700 rpms at idle.
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post #9 of 28 Old 06-24-2012, 06:14 PM
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If you are changing tunes with different base strategies I have found it best to go back to stock first. If the tunes are written for you truck's stock strategy I have had no issues loading different custom tunes based on that strategy.
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post #10 of 28 Old 06-25-2012, 04:57 PM
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Quote:
Originally Posted by Franchi View Post
I usually recommend you go back to stock prior to switching tunes if using a SCT simply because when you upload a custom tune, the SCT will save the tune on file as the OEM file. So if you have another custom tune on it currently and load a new custom tune, it will save the first tune as OEM.

But if you restore back to stock, then upload your new custom tune, you will still have your OEM tune.

Anybody correct me if I'm wrong but I believe that's how it works.
I have never returned to stock before switching between tow and srl... Does this mean I lost my stock tune?

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