The slip comes mostly from the serpentine side around the stillen pulley. The 8psi pulley is 3.2" and shotpeened for grip (not sure how effective it is) and obviously has a larger diameter than the 9psi (2.8") pulley, hence will have more traction. There is minimal wrap around that pulley. This is the reason Tbatt sells his extra pulley mod that places a pulley in front of the stillen one to create twice the amount of wrap on it.
Now on the supercharger side we have a 3.2" driving a 3.2" or 1:1 ratio. Here we do not see slip but can change these out to accomplish more boost instead of swapping serp side pulleys. The problem is that the idler pulley on that side has little room to keep tension on the belt when the pulley size drops. Pending you drop the pulley that comes directly off the shaft of the SC. The jackshaft pulley could go bigger but then you cant get the belt on. So, to remedy that you can buy a smaller SC pulley, directly off the SC, and then buy a larger idler pulley (3") so you still get the throw distance you need to keep tension on the belt. j
Another method is to get a smaller supercharger pulley but a larger jackshaft pulley so you keep the same amount of tension on the belt without needing a larger idler. This is what I did. 3.4 jackshaft and a 3.0 supercharger. This keeps the belt tension the exact same but will spin the supercharger about 10K faster than the 1:1.
Those pulleys from vortech are $99 each. So the cheaper method is the get the smaller supercharger pulley in a 3.0 or 2.8, depending how fast you want to spin, and the idler pulley that is $30. This method saves about $70 overall.
At least this is what I recall from everything I did almost 2 years ago. Is everyone confused yet?
Tbatt can you confirm this?
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