What size pulley for MP112?
 

I have a 2004 Joe Gibbs Tahoe which is 5.3L supercharged with the MP112. The stock pulley is 3.6" and makes 5.5 psi. What size pulley would I need to make 8 psi? Thanks.

I am not sure if you can change the pulley on the Joe Gibbs superchargers... I think you would need to replace the nose drive fo the blower.. I am sure someone else can chime in and verify.

How is the blower different than any other MP112 supercharger?

you a can put a 3.0 and would be at 8 put you would have to tune it for it.....

3.4 gives me 7# on a 5.3. So I would guess a 3.2 would get you 8 or 9

The are the same blower with a different nose drive.. You cant change the pulley unless you change the nose drive. See post #8.

https://www.performancetrucks.net/fo...bbs+nose+drive

For reference, I ran a 3.1 pulley for 9psi on my 5.3.

What exactly is the difference in the two nose drives if that is the case?

O. P. : for all magna chargers, and i believe for all twin screws in general, an eighth of an inch equals one pound of boost, which is typically about 20 horses. (direct from magnuson)
that being said i think a 3.2 would make the power you're looking for.

I get 8#'s with a 3.2

It is different based on the mods you have on your motor, so a pulley change isn't really a apples to apples comparison.