Project Toyota Tundra- Installing the TRD Supercharger Part 1

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The Gen 6 Eaton is quite a departure from prior generations of roots blowers.  The twin rotors have 4 instead of your typical two to three vanes and the rotor vanes are twisted in a 160 degree helix so there is a lot more working area inside the superchargers case.  This also provides a degree of internal compression improving compressor efficiency. 

The Eaton TVS has been validated by many OEM manufacturers.  It is the blower used by GM in the LS8 that powers the ZR1 Corvette.  This is the example used by Audi.  The layout of the intercooler is very similar to our blower and in the cutaway you can see how the twisted vanes meet and mesh.

TRD told us that the new blower has an adiabatic efficiency of 80% at the peak area of the map and is in the 70’s over a wide area of the map, unheard of in a roots blower and equaling the best turbochargers and centrifugal superchargers.

The front housing contains the inlet port, throttle body mounting surface, some vacuum ports for emissions and the compressor bypass valve.  The bypass valve is essential for part throttle economy.  Note the front pulley as well.  The inlet port geometry is essential for noise control and also controls the blower port timing which helps efficiency.

The increased working area of the blower vanes means that more performance can be squeezed into a more compact package.  In this case the compactness means that a large water to air intercooler can be incorporated into the supercharger case.  The intercooler is one of the reasons why this kit is so reliable and makes so much power. The new supercharger design is also very quiet.

At high manifold vacuum times, like under light throttle and idle, this dashpot opens a valve which allows air to recirculate around the compressor vanes so the blower cannot make boost.  This helps mileage and cuts parasitic losses under cruising conditions.

The supercharger also has an internal bypass valve which allows air to bypass the supercharger under part throttle so it won’t build boost and cause parasitic losses when the power is not needed.

The venerable roots 8-71 Supercharger has boosted generations of cars.  It was originally a bus supercharger but was adapted to car use by hot rodders in the 60’s.  As awesome as it looks, this blower is noisy and has a whopping efficiency of 50%.  It looks cool on old muscle cars though.