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2G Problem with saturn alternator @ high rpm

Posted by jery1234, Oct 28, 2016

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  1. jery1234

    jery1234 Proven Member

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    Joined Jul 26, 2008
    Toronto, ON, Canada
    I have installed bigger meth jets & had to re tune the car . So I made first & second gear pull . While I was analyzing the data log I have noticed that my voltage is dropping to 11.7 volts after exceeding about 7.5 k RPM. I just have installed brand new Saturn alternator (90 amp, big pulley) version. Is this known problem with those alternators? If so, what's the cure for this
     

    Attached Files:

    936  0

    1991 Mitsubishi Eclipse GSX
    · 1G DSM
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  2. bpk1337

    bpk1337 Proven Member

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    Joined Oct 28, 2008
    Phoenix, Arizona
    Having the same issue with my Saturn alternator (stock pulley) so I'm bumping this post. Attached is an EvoScan log. Dropping down to 11.5 volts at around 6.8 K RPM. All the lights in the cabin dim as I'm doing a pull.
     

    Attached Files:

  3. twicks69

    twicks69 Supporting Vendor

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    Milwaukee, Wisconsin
    What is the diameter of your pulley being used?
     

    Drag Race Build 7K  12  76

    1999 Mitsubishi Eclipse GSX
    9.499 @ 155.00 · 2G DSM
    Loading...
  4. bpk1337

    bpk1337 Proven Member

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    Joined Oct 28, 2008
    Phoenix, Arizona
    Twicks if you're asking me, Motor City Reman sold me one with a 2" od pulley. Sorry if I'm thread jacking Jery...
     
    Last edited: Jan 23, 2017
  5. jery1234

    jery1234 Proven Member

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    Toronto, ON, Canada
    The only thing you can do is to put a bigger pulley on it , so I have ordered 1g pulley from Kiggly & made the shaft hole Saturn size &about 1/4 inch distance washer to line it up . Works perfect @ 9.5 k rpm .
     

    Attached Files:

    936  0

    1991 Mitsubishi Eclipse GSX
    · 1G DSM
    Loading...
    bpk1337 likes this.
  6. bpk1337

    bpk1337 Proven Member

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    Phoenix, Arizona
    Do you know what the dimensions are for that kiggly pulley?
     
  7. twicks69

    twicks69 Supporting Vendor

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    Joined Mar 12, 2004
    Milwaukee, Wisconsin

    Drag Race Build 7K  12  76

    1999 Mitsubishi Eclipse GSX
    9.499 @ 155.00 · 2G DSM
    Loading...
    bpk1337 likes this.
  8. bpk1337

    bpk1337 Proven Member

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    Joined Oct 28, 2008
    Phoenix, Arizona
    You are the man Tim! Thanks.
     
  9. jery1234

    jery1234 Proven Member

    220
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    Joined Jul 26, 2008
    Toronto, ON, Canada

    936  0

    1991 Mitsubishi Eclipse GSX
    · 1G DSM
    Loading...
    twicks69 likes this.
  10. bpk1337

    bpk1337 Proven Member

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    Joined Oct 28, 2008
    Phoenix, Arizona
    Twicks, what is your idle, and rev limit at with that 2.55" pulley?

    Jery, what is your idle set at for that 3 in Kiggly? Any idle issues?

    The reason I ask is I'm doing some calculations..

    (According to Jegs website)
    Delco SC130 105 Alternators Specs are:
    80A @ 2,400 RPM @ 13.2 VDC @ 77F
    Maximum RPM: 18,000

    I'm running a Fulidampr pulley with an O.D of 6.375 in.

    With a 3" OD pulley max engine RPM is 8,470, and would need an engine idle of 1,129 RPM to reach 80A.
    With a 2.55" OD pulley max engine RPM is 7,200, and would need an engine idle of 960 RPM to reach 80A.

    Anyone please feel free to correct me if I am wrong.
     
  11. twicks69

    twicks69 Supporting Vendor

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    Milwaukee, Wisconsin
    I have it on two motors with a 950-1000 rpm idle, and a 9400rpm limit on the aluminum rod motor and 8800 on the steel rod motor, both are 2.3L setups.

    They both are using aggressive cams at/over 288*, my aluminum rod motor has a high lift 294* cam similar to a Kelford TX294 (mine is an ancient Crower custom cam), the other is a Kelford TX288 on the steel rod motor.
     

    Drag Race Build 7K  12  76

    1999 Mitsubishi Eclipse GSX
    9.499 @ 155.00 · 2G DSM
    Loading...
    Geeb and bpk1337 like this.
  12. bpk1337

    bpk1337 Proven Member

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    Joined Oct 28, 2008
    Phoenix, Arizona

    Attached Files:

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