CAR53 wrote:Increase the friction of the surface of the SC pulley by application of a special coating.
Good luck with that
whoever gave you that advice is not worth listening to.
That special coating is designed for V belt applications and will only serve to degrade your belt even faster by clogging it up with dirt and grim eventually filling the small groves in your serpentine belt reducing your surface area.
I am guessing you are running a static belt tensioner with the belt running the factory route over the water pump last before returning to the crank pulley (this location is where the most slip will be generated.)
I am no expert I found all this out through trial and error and research (and some help from my engineer friends) When designing a a belt route I am told that you need to have the highest load at the first point of the belt route.
So there is a solution. Get rid of the Kluge tensioning system you are currently running and relocate the factory tensioner add another pulley re-routing the belt over the water pump pulley first this will not change the direction of any of the components, but it will reduce the amount of slip on the water pump by increasing belt wrap reducing belt length to and from the pulley etc.
This is very easy to do inexpensive (and correct) and guaranteed to fix your problem.
How do I know. I had the exact problem and it worked. I can show you dyno charts and the static tensioner we tried but not only that I can show you the finished product with no belt slip and strong reliable boost.
Sorry this sounds aggressive I am just super over bad advice being thrown around on forums and people being taken advantage of by quite frankly, people who should know better.