Post by
Q45tech »
https://forums.nicoclub.com/q45tech-u112.html
Thu Mar 16, 2006 2:34 am
Underdrive pullies cannot free up 10 HP unless the accessories consume 3-4 times that amount! The AC compressor has a clutch so little in the free wheeling mode.
Alternator has a max of 4.5, power steering the same when fully loaded at a low speed, fan maybe the same at high rpms.........add all that up and at worst you might get 15 HP. A 20% underdrive might save 3-4 HP.
There is a reason the pully ratios are selected as they are and changing them may have serious downsides in cooling , alternator output, cold power steering as the systems age.