Hey guys i have done some searching on here I have not found quite what im looking for. I have a 2003 mini s r53. This is the 3rd time I have shredded a belt I replaced 2 tensioner within 5000 and belts. I have a reductioner supercharger pulley I do not know what size. This morning the belt shredded again . It seems to happen in higher rpms. Whats causing this any help would be great. Also if anyone has an outside dimensions of pulley sizes that would be great so I know what I have.

 

Your pulley is probably not properly mounted.

 

The pulley seems to be spin straight and inline with everything else. Also what size belt for reduction pulley I broke down on my way to work I want to be able to grab another belt I forgot the sizes.

 

Check the crank pulley and idler pulley all line up straight on the belt. Depending on your pulley(you don't what size) you can try a Gates K060539 if that is too big got to a K60535. How much tension has been on your previous belts? Sounds like a lot.

 

Im not sure of the tension I will buy both belts and see what works.

 

Take a picture of your SC pulley and post it as we might be able to help you identify it.

 

This. The most common reason for belts to fail is that they are too big. This is especially true for high-RPM failures. Check that all your pulleys spin freely and get the right belt (squeeze a 535 on there).

 

Ok well I just picked up a 535 belt , unfortunatly the tensioner is toast. Ill be ordering a new one along with tensioner stop.

 

So this will be your third tensioner? WTF

 

Picture of pulley sorry its difficult to see

 

3rd tensioner yes. :/.

 

have you looked at your crank pulley/damper? you might have damaged it during an earlier belt failure. it might only have a burr that eventually cuts your new belt.

 

Without a picture of your pulley setup or some measurements of the pulley, we really can't do much to help you.