What's the diameter of the Brabus pulley? The larger pulleys are about 8 7/8". I think it's just an illusion that it will rub, but you can actually make the pulley about 9" and it won't rub against anything and I know someone with a larger pulley like that. What does rub is the belt against the side of the waterpump. To have a pulley larger than the ASP you need either a different waterpump pulley or a idler pulley that is larger so that it pushes the belt away from the waterpump pulley. Although it's possible to run a 9" pulley, we found that even though you get about 1/2 PSI more boost, the HP required to spin the s/c at that speed is more than the gain, so you end up with a more heat, same HP.
Last edited by Buellwinkle; Jan 15, 2005 at 11:35 PM.