Would a high output alternator cause damage?
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This is a discussion on Would a high output alternator cause damage? within the Interior Mods forums, part of the Tech & Modifying & General Repairs category; I was reading a thread on another site earlier today about high output alternators on a WRX. Some people said ...

  1. #1
    Registered User Whoa!ShutItDown's Avatar
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    Would a high output alternator cause damage?

    I was reading a thread on another site earlier today about high output alternators on a WRX. Some people said it could damage the cars computer others said thats not true. I found this alternator that says it fits 2002-2005 WRX's. Im going to be running:

    2 - Crunch p1400.2 amps (1400 watts max, each)
    2 - Alpine Type R subs 2 ohm
    Alpine CDA-9884
    3.5 farad capacitor


    Will I need to upgrade my alternator? Is there anything else I will need or should do? I know questions like this have been asked time and time again but I have been searching the forums all day and cant find a definite answer.

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  3. #2
    Registered User vttk_mig69's Avatar
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    i would say the caps will help but i would at least upgrade the alt a little bit (you dont need that much power)

    and im running that same amp with a 1 farad cap and i get no dash fade or any distortion on the subs end.

    plus the crunch amps arn't a true 1400watt amp thats just peek power and the RMS power or true power is more like 600 to 700watt Max.

    im pushin 2 MTX Blue Thunders (old ones) but sounds great.

  4. #3
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    The only thing you would be worried about is if you were changing pully's. Just upgrade the wire that goes from the alternator to the battery. Another smart thing is to upgrade the grounds that go to from the battery to the chassis scrape the metal off n everything, go to your local car audio store and have them make you a good cable with connectors if you dont have crimpers
    "If your gunna pimp it...pimp it right playa"
    SPT intake, Greddy TBE, Up-Pipe, Aceessport, Pro-Tuned=Front: Rockford Fosgate 6'1/2 Component
    Rear: Memphis 4" Component
    Sub: Rockford Fosgate P3 10" 43hz
    3x-Rockford Fosgate T400-2
    Rockford 10 Farad Capacitor

  5. #4
    Registered User Whoa!ShutItDown's Avatar
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    I have 2 17ft pieces of 0 gauge wire for power and ground. I have a fused distribution block for 12v and a non-fused distribution block for ground. Would I still need to upgrade the ground with the chassis? What size and how much wire would I need for the alternator? Thanks

  6. #5
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    I'd grab 2 feet of 4 gauge and ground it to the engine or make a new one through a spot weld. But, to upgrade the alternator wire where does that wire lead...? Where does it hook up? Anyone wanna input? . Because of this post I now want to upgrade my alternator wire, forgot to do that haha
    "If your gunna pimp it...pimp it right playa"
    SPT intake, Greddy TBE, Up-Pipe, Aceessport, Pro-Tuned=Front: Rockford Fosgate 6'1/2 Component
    Rear: Memphis 4" Component
    Sub: Rockford Fosgate P3 10" 43hz
    3x-Rockford Fosgate T400-2
    Rockford 10 Farad Capacitor

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