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2004 to 2008 F-150 and Mark-LT
4.2L, 4.6L and 5.4L equipped F-150s and Mark-LTs.


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Old Sat, July 9th, 2011, 01:16 AM
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I had a buddy do the pulleys at his shop, best money i spent. noticed a bit of low end power, wouldn't say more power just more get up and go. just need to know how much to turn up engine idle. Troyer says 850 rpm so i went in and raised it 250 rpm in the engine idle in the custom tunes. can anyone confirm this is correct please
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Old Sat, July 9th, 2011, 08:02 AM
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I had a buddy do the pulleys at his shop, best money i spent. noticed a bit of low end power, wouldn't say more power just more get up and go. just need to know how much to turn up engine idle. Troyer says 850 rpm so i went in and raised it 250 rpm in the engine idle in the custom tunes. can anyone confirm this is correct please
That sounds about right.......700-850 rpm idle

In the end I just used an overdrive pulley on the alternator....
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Old Sat, July 9th, 2011, 07:08 PM
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whats an overdrive pulley and where do i get one. what changes do i have to make to accommodate this overdrive pulley
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Old Sat, July 9th, 2011, 07:17 PM
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whats an overdrive pulley and where do i get one. what changes do i have to make to accommodate this overdrive pulley
It is the opposite of an underdrive pulley. Rather than make the alternator shaft spin slower (reducing load) it makes it spin faster. It basically cancels out the underdrive pulley kit's effect on the alternator so no adjustment will be needed.
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Old Sat, July 9th, 2011, 07:28 PM
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where do u get one of these
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Old Mon, July 11th, 2011, 12:30 AM
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where do u get one of these
I got it from a mustang guy locally....idk where he got it from.....I was having troubles finding one on the internet....
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Old Mon, July 11th, 2011, 06:55 PM
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does it have and affect to the underdrive pulleys, as in power, or just fix the alternator issue
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