1st Gen R53 Cooper S High output Alternator

Discussion in '1st Generation: 2002–06 R50, R53 & 2004–08 R52' started by Sleek Motoring, Feb 9, 2015.

  1. Sleek Motoring

    Sleek Motoring Local Shop Owner

    Dec 7, 2014
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    I currently have my engine out of the car, I would like to go to a higher output Alternator. I am thinking about having it rebuilt instead of going with a whole new unit.I already upgraded to a odyssey battery and I've seen a few new alt on the net (not sure of the build quality)

    A few questions:

    -Does anyone have a recommendation for a shop that can rebuild them?

    -Options for a brand new high quality high output unit if I choose not to rebuild.

    -Will I need to upgrade the battery cable gauge size running to the trunk and add an inline fuse?

    -Upgrading the ground AWG size? Adding more grounds necessary?
     
  2. Kenny kustom

    Kenny kustom New Member

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    I've had some ho alternators before.
    Try Ohio generator.
    Usually best you will get is maybe 20A more.
    Unless you could massage a larger frame in there.
    No need to upgrade the wiring. Why do you need a larger alternator?
     
  3. Dave.0

    Dave.0 Helix & RMW Powered
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    Why do you think you need one?

    The OEM one works fine unless you are somehow stuffing 10,000 watts worth of old amps and 20 Subwoofers.
     
  4. Eric@Helix

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    This is kind of what I was thinking. If an HO alternator is the answer, what is the question?
     
  5. Metalman

    Metalman Well-Known Member
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    [​IMG]
     
  6. Sleek Motoring

    Sleek Motoring Local Shop Owner

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    I will be adding a few more lights, a JL amp, HFS-3 Aquamist system (pump runs constantly),uprated electric cooling fans,uprated fuel pump,and the big one is an AccuAir air ride suspension system. That system constantly adjusts while driving to keep the car level.
    With all that I thought it would be beneficial to upgrade the ALT output to reduce the strain on the stock system (or am I overthinking this).

    I've had noticeable improvement when i've upgraded grounds and charging cables coming off the alternator on these newer cars with multitudes of sensors sending information to the ECU.
     
  7. Dave.0

    Dave.0 Helix & RMW Powered
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    I think you are over thinking it because I have a JL amp (900w) and a Aquamist meth system and have no power issues.

    The Aquamist pump does not run all the time. It only runs when it's triggered based on the duty cycle on the injectors which you set yourself. My Aquamist kit is on all the time but the pump does not always run.
     
  8. Kenny kustom

    Kenny kustom New Member

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    You might be better served by running dual batteries. Maybe a pair of 925 Odyssey.
     
  9. Sleek Motoring

    Sleek Motoring Local Shop Owner

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    I would rather not have that extra weight of another battery. I guess all I am asking is if I upgrade the amperage of the alternator am I going to have to upgrade the gauge wire going to the battery as well?
     
  10. Kenny kustom

    Kenny kustom New Member

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    Lights, stereo, air tank, compressor, etc.
    And you're worried about the weight of another battery.... Lol.

    Your answer. Maybe.
    Depends on the amount of charging upgrade.
     
  11. Kenny kustom

    Kenny kustom New Member

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    Why not contact Ohio generator as I suggested. Ask them about the possibility of upgrading your alternator. Once you have some amperage specs. Then you can go from there.
     
  12. Canusrufis

    Canusrufis RMW Powered R53
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    http://www.qualitypowerauto.com/Wire%20Sizing%20Chart%2012V%20DC.htm

    wire gauge chart. You would need to figure total amps -- I'm guessing your north of 200A. Back in my electric motor days whenever we needed slightly more Amperage a smaller alternator pulley was used. Here that would be especially useful at idle when the alternator pulley spins slower, thus producing less useful current.
     
  13. Metalman

    Metalman Well-Known Member
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    At 200A the chart calls for 4 gauge.... Pretty sure the stock isn't that heavy...
     
  14. TheModFather

    TheModFather Well-Known Member

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    Actually it is! From the alt to the jumper post and all the way to the back for the battery... ;)
     
  15. Metalman

    Metalman Well-Known Member
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    I forgot the 1 gen has the battery in the back.... So that would be a 1 gauge, so that would make the wire .289" diameter for a 200A...
     
  16. Dave.0

    Dave.0 Helix & RMW Powered
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    This is still the best answer. :eek6:

    Weight concern......where.....:ihih:
     
  17. Sleek Motoring

    Sleek Motoring Local Shop Owner

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    Those other parts add more functionality to the car (yes, and weight) Not just adding to the electrical system!
     
  18. Kenny kustom

    Kenny kustom New Member

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    Just remove the alternator and take it to any rebuilder. They should be able to give you maybe 25 amps more.
    Find the largest battery you can fit in the trunk. Done.
     
  19. Sleek Motoring

    Sleek Motoring Local Shop Owner

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    Thanks!

    I am going to send it to Generator Exchange in Denver. I am going to get a mild upgrade to Amperage.

    I have a really nice Odyssey battery going in!
     
  20. ZippyNH

    ZippyNH Well-Known Member

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    If you are running a big intermintant load, you might want to consider getting a "batt cap", aka a capictior, added inline to the heavy load...were once used with high load amps before they became more efficient. In a radio install, it provided the extra surge power to prevent the lights from dimming from heavy bass....might be useful in your install if you have concerns of the need for sudden surge current being needed, like the air compressor (most decent installers actually install one on home ac units, same idea, prevents the house lights from dimming, etc when it kicks on).
     

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