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140 Amp Alternator for 7/9 Series with B230FT?

posted by  pbonsalb on  Wed Sep 1 14:18 CST 2004
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last visit: Fri May 9 09:43 CST 2008
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Are there any 140 amp alternators that will swap in place of the 100 amp Bosch unit? I have tried one 100A Bosch with external adjustable voltage regulator, one 100A Bosch with internal regulator, and one 100A denso. They were all about the same -- insufficient at low rpm. I am running a powerful electric engine fan and a special heated wide band 02 sensor and I have an underdrive crank pulley (but have raised my idle speed by 20% to 1000 rpm). I think I need an alternator that puts out more amps at low rpm. I am guessing that a 140 amp would put out about 40% more amps at low rpm, like idle speed, and would probably be sufficient.

Whatever will fit a B230FT in a 7 series is fine. It can be Bosch, Denso, or whatever. Any recommendations?

Thanks,

Philip Bradley






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