URD 5vz Idler Pulley for TRD Supercharger Dynamic Tensioner
of our customers use their trucks with the TRD Supercharger for off
road desert racing. We were asked by them to come up with a solution
for the chronic problem of the supercharger belts breaking in this
investigated this problem and what they discovered why the belts where
breaking at an alarming rate. What is happening is that when the rear
tires leave the dirt at full throttle they spin up rapidly and so does
the engine, then when the tires make contact again the suddenly slow
the tires are in the air the supercharger is sped up to a very high
RPM, much faster than the engine's speed. The supercharger rotors have a
lot of mass and store energy like a flywheel. When the engine suddenly
slows down the supercharger is still spinning very fast. This pulls
the slack side of the supercharger belt tight and pulls the spring
loaded tensioner out to its full extension. The next thing that happens
is that the engine speeds up again and speeds up the supercharger and
the spring loaded tensioner cannot react fast enough to keep tension on
the slack side of the supercharger belt. This allows the belt to lose
contact with the tensioner pulley and the belt rolls off the side of the
pulley and gets trapped between the pulley and the tensioner arm and
locks the belt. Engine torque now snaps the belt and boost as well as
the race is lost.
key to fixing this problem was to keep the belt from rolling off the
side of the tensioner pulley. The simple fix was to develop a pulley
with tall ears on it to prevent the belt from rolling off the side it
and getting locked.
URD Tensioner pulley for the TRD 5VZ-FE Supercharger system has tall
ears on each side to keep the belt on the pulley in racing conditions.
The URD pulley solves the chronic belt breakage problem in off road
do not have to be an off road racer to install this upgraded pulley.
Most off our customers that install them don't even drive their trucks
The pulley is finished in URD red anodizing to match
the other SuperGrip performance pulleys that are available and looks
very nice under your hood.
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