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2005 Stealth Gray CTS-V, 2009 Black CTS-V
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lasstss said:
Also, I went to the 2.8. Running into third the V falls flat for an instant. I attribute that to belt slip. In my opinion, the V belt at these smaller diameters just doesent have anough "surface" to keep a grab on the pulley. The smaller the pulley, the worse the problem. It should have been a cog belt.
That's interesting. The belt practically wraps around the pulley to (hopefully) alleviate this exact problem. I suppose the solution is to change to a different belt.

Are you sure that isn't just in need of a tune? Your air/fuel ratios will go to the toilet when you change to the smaller pulley. I had to have a whole new tune once I went to the smaller (but correct) 2.8" pulley.
 
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