mrmint69

Car has been running perfect as of late. I finally get to enjoy all the power after finding my problems. I notice that if I am going wot and let off the gas rather quickly, the belt squeels or chirps for a second. Is this normal or something like to tight or loose of a belt?

mzgp5x

I had a similar problem. I run a 12 rib belt on a Procharger D1 set-up. When you let up on the throttle, the tightside tention moved from lower segment to the top segment. Air has mass and so it tends to over drive and load the pulley in the opposite direction. A cyclic vibraion can result that will dampen over time. Procharger idler systems don't have much damping in their system.

This can cause the belt to skip off the driven pulley. I destroyed a belt and compressor seal at one time.

My solution. I Engineered a simple plastic delrin stop on the idler arm so it would not allow the belt to lift and this prevented large amplitudes. This worked for me, but I have only run the procharger setup. Not a Vortec.

Many people go for increased spring load on the idler arm. This results in more cantelever load on the crankshaft. Some break the crank shaft @ the hub due to metal fatigue. I don't load the idler springs much with my set-up.
Hope this helps. B.

Kevin Blown 95 TA

In racing, stuff can slip or stuff can break. All my stuff slips a little bit, but it never breaks.

One reason the blower does that it is all the inertia of the gears and rotating parts in the blower drive can't suddenly decellerate from 50,000 rpm when the throttle slams shut. If it's just slipping for a 1/10th of a second, no big deal - obviously you wouldn't want some bouncing or oscillation of the idler like Mzgp5x is describing...