Are You Using the #47 Fuse Bypass Relay? - Mustang Evolution

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Old 10-05-2014, 08:49 AM   #1
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Are You Using the #47 Fuse Bypass Relay?

I've been using mine for 6 months and it's been working fine. Sure beats physically pulling the fuse every week.

Fuse 47 By-Pass to Relay w/photos
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Old 10-05-2014, 12:35 PM   #2
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I want to do it, but I'm not going to without seeing a video of the process first.


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Old 10-05-2014, 03:30 PM   #3
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Old 10-05-2014, 03:32 PM   #4
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^ Dang, sorry, I meant video.

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Old 10-05-2014, 07:46 PM   #5
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Tried to. Followed the instructions for the relay to the T but my car flipped the hell out when I started it with it in.

Bad idle, surging and a CEL. Obviously there's something wrong with the relay, but it's just not important enough to me to redo the whole thing.

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Old 10-05-2014, 09:26 PM   #6
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Ideally, doesn't the computer need to 'relearn' everything after the 47 fuse pull? Kinda like reloading a tune?

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Old 10-05-2014, 09:57 PM   #7
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Here's an actual dyno of before and after 47 pull. Stock tune.

|| ~BlackOnBlack~ ||
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Old 10-05-2014, 11:25 PM   #8
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Originally Posted by bazinga11 View Post
Here's an actual dyno of before and after 47 pull. Stock tune.

|| ~BlackOnBlack~ ||
So you loss torque after pull fuse 47, wow

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Old 10-05-2014, 11:29 PM   #9
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Pulling the fuse then immediately on a dyno isn't a good idea. The whole system has to relearn the timing.

There's a sweet spot between the initial pull and when it starts to get "watered down".

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Old 10-06-2014, 12:06 AM   #10
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Doesn't the car just relearn by driving it anyway?


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Old 10-06-2014, 12:30 AM   #11
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Originally Posted by 2011 Kona Blue View Post
So you loss torque after pull fuse 47, wow

The Mustang Source Website is complete trash and the moderators are complete toolbags. TMS, Go F yourselves!
Yeah, not only that, but the pre 47 pull stays higher for more time than the after 47 pull number.

There is a peak where it makes more horsepower, but for the great majority of the time the pre pull is making more power.

I'm really curious about if these would be the same results for the automatics, because I believe he drives a standard.
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Old 10-06-2014, 02:08 AM   #12
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Quote:
Originally Posted by VIG View Post
Yeah, not only that, but the pre 47 pull stays higher for more time than the after 47 pull number.

There is a peak where it makes more horsepower, but for the great majority of the time the pre pull is making more power.

I'm really curious about if these would be the same results for the automatics, because I believe he drives a standard.
Yeah the main reason for the Fuse 47 pull/relay is to clear the automatic's adative shifting, not really for power gains. Even with a tune, the adative shifting is still active and will cause some sluggish shifts after a while. Especially if you hit some slow-mocing traffic on occasion.
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