The latter idler sits just to the lower-right (when facing the engine) of the supercharger pulley, and acts as an additional tightening force on the belt. When we queried Ricardo Topete of GTR ...

An idler shaft installs on the front of the factory idler pulley to house the supercharger’s idler. This is not installed on the HO system, which uses the factory 6-rib belt routing. See All 16 ...

Two 8-rib idler pulleys were installed on to the main bracket, the supercharger belt was installed, and the belt was tensioned via a screw-jack belt tensioner attached to the main bracket and the ...

These superchargers are the centrifugal type ... Note the adjusters on the idler pulleys that are used to establish belt tension. See All 18 Photos These are the blow-off valves—they are ...

In this case, my 2002 Jaguar XJR 100 needed a new supercharger belt ... we have to get both elbows down there to replace the idler pulley. (Actually, we do eventually have to do that, but that ...