I have 2 Greddy BOV's 40mm diameter each. I removed one of the springs from inside each unit and spring tension is quite soft. One is before the IC, one after. I do get some flutter when closing the throttle from very high rpm's, but generally, I hear the air being dumped as it should be.
I just fitted a 63" belt ( as opposed to 64" I was using, and photographed ), and tightened as you describe. At 80lbft, I get slippage over 10psi.
Tightening it to 120lbft, there is no slip, but damn it feels tight. So far with a few quick blasts, the belt has stayed intact, and on the inner grooves.
Im thinking perhaps, the belt on the long side, is vibrating, touching the belt around the idler, and maybe this is causing it to tear apart ?
On the long side of the belt between crank and blower, there is approx 19" of belt not touching any pulleys.
Thats the way its gona stay for now. Belt tightened to 80lbft until I race tomorrow at which point I'll tighten it up. I leave tonight around midnight for Scotland, then have roughly a 375mile drive through Scotland and England to the track. After that its another 400 mile drive back up North past Edinburgh to Crail to another track on Sunday. Once racing is done, its about a 250mile drive to get the boat back home again.
Fingers crossed everything will run smoothly. I have a spare 63 and 64" belt with me.
Its so crap not having any dragstrips in this country :(
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