I've battled belt chirp since installing a Metco Lower Pulley kit a couple of years ago. It's come and gone with nothing in particular making it stop. A few hundred miles ago, it shredded a belt. I put a new one on and it shredded within a 100 miles. I think I've been through 3 or 4 in the past 500 miles. Last week I decided enough was enough and started taking things apart. I took the lower kit off, cleaned everything and reinstalled it per Metco's instructions. I retorqued all idlers and replaced the bearing in the one closest to the crank pulley. I took off my Thump RRR tensioner, inspected it and reinstalled it. I even got a Gates Laser Pulley Alignment tool and checked alignment as well as the runout of the supercharger, tensioner, and alternator pulleys. Everything looks aligned and spins true. I fired the car up and the belt is still walking forward on the crank pulley while under load! Ughhhh!!! What the hell is going on? I've got a 100mm Metco idler next to the crank pulley and there is barely enough room to get the belt through there...is it too close? Should I switch to a 90mm pulley? I'm running a Gates Green Stripe 78.5" belt...according to the Billetflow website, this is the correct length for my pulley setup...2.7" upper, 3 x 100mm idlers, 1 x 90mm idler, 3.2" alternator pulley, and a 4 pound lower. Should I switch to a longer belt? What else can I try?
