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Conversation Between Fifty150 and DOD 4.6
Showing Visitor Messages 1 to 2 of 2
  1. Fifty150
    02-14-2009 07:23 AM
    Fifty150
    I have no idea what your idle rpm is. But mine is right at about 650. I have e-fans & an underdrive pulley. Truck runs just fine. Stock alternator isn't having any problems with keeping the battery up.
  2. DOD 4.6
    02-14-2009 07:02 AM
    DOD 4.6
    would underdrive pulleys and an e fan be too much on a stock alterntor? Is it best to increase the idle by 75 rpms or so to compensate?

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