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From my own experience over the last 7-8 years with my YSi...it seems the most important thing with a ribbed setup...is a damn good sprung tensioner.
Over the years I had everything from 6, 8, 10, 12rib through 50mm cogs on mine. Obviously the cogs didnt slip, but just couldnt hold belts to it. Sometimes they'd last a good while, others they'd die after a few short blasts.
With the manual tensioner and a blower brace, the 12 rib gripped fine when tightened to ****. Eventually the brace broke. So that was no use.
After the cogs I went back to my 12 rib stuff, adapted a tensioner off some Cummins thing ( bought off egay just, because it looked usable. )...and at last the damn thing gripped. That was with 8.5" crank and 2.9" blower.
With a manual tensioner and no brace, I couldnt get it to hold boost past about 15psi or 5000rpm.
Although by that stage I decided **** this, and decided to turbocharge it instead, which is work in progress
Wish I'd discovered the sprung tensioners a few years ago, would have saved me some aggro !
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