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I resently rebuilt my engine and am running ripps overdrive crank pulley and the smaller shaft pulley. I think it's supposed to run around 15-18psi. I'm been slowly allowing the engine to run more boost now that it's starting to get around 1,200 miles on the engine. I'm finding that it starts to slip around 9-10 psi. I also have removed my a/c system and know that the belt doesn't have quite as much contact area with the pulley now. The belt is very tight and I'd hate to tighten it more in fear of burning up my alternators bearings. Will the tensioner ripp sells be the only hope for a non-slipping belt or what?