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Thread: ALternator mod

  1. #1
    Join Date
    May 2006
    Posts
    20
    I once heard you could run a switch to the alternator to turn it off & reduce drag while at the truck. All this without removing the belt. Anyone know what I'm talking about and how to do it?
    http://www.angelfire.com/alt/americanscrapmetal/4.jpg

    2006 Ext Cab LT 1500 4.8 Auto.

    Mods:
    K & N, MAF descreen, Cold air tube, Ported TB, TB Bypass, Predator tuned, No cats, Dual exaust w/Flowmasters, 4.11 Yukons w/posi, 160 Stat, Tranny cooler

  2. #2
    Join Date
    Apr 2003
    Location
    Mansfield, Texas, USA
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    2,462

    Cool

    You could probably install a microswitch to kick it off at WOT. I'll have to do some head scratching on it, should pick up a few more on the high end.
    The superior man is modest in his speech, but exceeds in his actions. - Confucius

    "He who asks of life nothing but the improvement of his own nature, is less liable than anyone else to miss and waste life."- Henri Frederic Amiel

    '01 Chev Z71 LT - '85 BMW 745i TURBO - '88 BMW 750iL - '88 Ford F150 XLT Lariat - '79 MB 240D - '79 MB 280S Euro
    '80 MB 380SE-5.0 Euro - '85 MB 300SD - '87 MB 300SDL - 1990 MB 300SEL - '91 MB 300SE - '91 MB 560SEL

    Let's face it, the red hair... makes 'em wet.


  3. #3
    Join Date
    Oct 2006
    Posts
    38
    isnt that the differance between a ac compressor and an alternator, one can get switched on/off clutch, an alternator is always spinning???
    that's the way I see it????

  4. #4
    Join Date
    Apr 2003
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    Mansfield, Texas, USA
    Posts
    2,462

    Cool

    <div class='quotetop'>QUOTE(Detroitjoe &#064; Jan 25 2007, 11&#58;12 AM) [snapback]81171[/snapback]</div>
    isnt that the differance between a ac compressor and an alternator, one can get switched on/off clutch, an alternator is always spinning???
    that&#39;s the way I see it????[/b]


    Alt is always charging, if you install a microswitch to disconnect the reg it won&#39;t charge...
    The superior man is modest in his speech, but exceeds in his actions. - Confucius

    "He who asks of life nothing but the improvement of his own nature, is less liable than anyone else to miss and waste life."- Henri Frederic Amiel

    '01 Chev Z71 LT - '85 BMW 745i TURBO - '88 BMW 750iL - '88 Ford F150 XLT Lariat - '79 MB 240D - '79 MB 280S Euro
    '80 MB 380SE-5.0 Euro - '85 MB 300SD - '87 MB 300SDL - 1990 MB 300SEL - '91 MB 300SE - '91 MB 560SEL

    Let's face it, the red hair... makes 'em wet.


  5. #5
    Join Date
    Nov 2003
    Location
    Denton Texas
    Posts
    20,540
    All you need is a toggle or micro switch to cut off the signal from the little wire coming from the alt to the PCM, right?
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  6. #6
    Join Date
    Jan 2005
    Location
    Humble/Houston TX
    Posts
    2,586
    would it really make enough of a difference for you guys to go through the hastle?

    old mod list: H/C/I/N/E/G 408
    new mod list: 5.3, gears/posi, mufler and tune : (

  7. #7
    Join Date
    Nov 2003
    Location
    Denton Texas
    Posts
    20,540
    It probably has more benefits than the TB water bypass. I would think that the alt would eat 3-5 HP. My only concern would be if battery voltage dropped when the switch was off.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  8. #8
    Join Date
    Apr 2003
    Location
    Mansfield, Texas, USA
    Posts
    2,462

    Cool

    I know E46 M3 BMWs kick the alt off at WOT...
    The superior man is modest in his speech, but exceeds in his actions. - Confucius

    "He who asks of life nothing but the improvement of his own nature, is less liable than anyone else to miss and waste life."- Henri Frederic Amiel

    '01 Chev Z71 LT - '85 BMW 745i TURBO - '88 BMW 750iL - '88 Ford F150 XLT Lariat - '79 MB 240D - '79 MB 280S Euro
    '80 MB 380SE-5.0 Euro - '85 MB 300SD - '87 MB 300SDL - 1990 MB 300SEL - '91 MB 300SE - '91 MB 560SEL

    Let's face it, the red hair... makes 'em wet.


  9. #9
    Join Date
    Nov 2003
    Location
    Denton Texas
    Posts
    20,540
    It only makes sense to disable the alt and a/c at full throttle. If you could put a clutch on the power steering that would free up some HP, also, if it were to free wheel at full throttle. That&#39;s probably why Honda is experimenting/implementing electronic power steering and electric water pumps instead of engine driven.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  10. #10
    Join Date
    Aug 2006
    Location
    Willis, TX
    Posts
    724
    A micro switch on the peddel and a NC relay for the sml red wire should work. I know when you have an alternator on a test bench and you energize the field you better have a good grip on it.... they will pull out of your hands

    05 RC, LME 6.0, 243 Heads, LSA Rods, 11:25 Forged Pistons, Cam Motion Custom Grind, 4:10, Eaton LSD, Narrowed Rear-end w/ Chromoly Axles, Pacesetters LT's, SLP Loudmouth II Mufflers, Volant CAI, Yank SSTB3600, Bosch 42 lbs inj's, G-Force Tune, FLT Level 4 Trany, Belltech 2/4, Times: ?
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