Underdrive pulley
Recovery Vehicle
Joined: May 2009
Posts: 1,081
Likes: 1
From: Punta Gorda, FL
True about the alternator, but the D1 tranny is not electronic, it is old school pressure. No tranny ECU on D1. Having a different pulley, to boost HP, but require higher idle, and maybe decrease water pump flow, pretty soon you get to the land of diminishing returns. Of course, with gas prices being what they are, I'm not operating my engine at the peak of the horse power curve anyway.
Yes, I shoulda been more clear. On a D2, underdriving the alternator may(probably) throw trans codes
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