I have been researching this a little here and there and have found a lot of mixed on it. What I am attempting to do is find a lighter crank pulley to be used with the k24z7. I do not want an aftermarket one due to it not having the dampening ring. I also plan on going with a ct-e supercharger later on. I see some people choose to use a larger diameter crank pulley to increase boost levels, which one would think a smaller diameter pulley would do this because of physics haha. I have looked into many factory pulleys that I will list below. With proven experience which would work best. My thought is the smaller diameter one that is lighter. It reduces spinning inertia and increases belt speed causing less parasitic draw and increased supercharger pulley speed.

Part #:*13810-RRA-A02
Found in:*
2002-2006 Base RSX (k20a3)
2002-2005 Civic Si (k20a3)
2004-2008 TSX (k24a2)
2002-2006 CR-V (k24a1)
2003-2005 Accord (k24a4)
Diameter:*6.125"

Part #:*13810-RZA-A01
Found in: 2007-2009 CR-V (k24z1)
Diameter:*6.50"

Part #:*13810-RAA-J02
Found in: 2006-2007 Accord (k24a8)
Diameter:*???

Part #:*13810-RRB-A01
Found in:*
2006-2011 Civic Si (k20z3)
Diameter:*5.75"

Part#:*13810-PRC-003
Found in: 2005-2006 RSX Type-S (k20z1)
Diameter:*5.40"

Part#*13810-PRB-A01
Found in: 2002-2004 RSX Type-S (k20a2)
Diameter:*5.80"

 

It turns out I was wrong about the crank pulley needing to be underdriven to create more boost. Overdriving the pulley creates the correct ratio to provide more boost. Given my stock pulley is one of the largest if not the largest k series pulley I will be sticking with the one I have. Apparently under drive pulleys are only good for na and turbo setup cars.