Under the Hood: DodgeSRT-4
A few more interesting things about the turbo: Packaging constraints dictated a reverse-rotation turbo that spins counter-clockwise, unlike most turbos (but like the EVO VIII's). The Mitsubishi TD04 compressor has a compressor bypass valve built right into the compressor housing. The silver can on top is the diaphragm that opens the valve to vent boost from the volute (the outside of the snail) back to the compressor inlet. Both the wastegate and bypass valve get their boost signals via ECU-controlled solenoids.All together, the turbo is a Mitsubishi TD04LR-16Gk with a 6cm2 turbine inlet. This will only mean something to you if you're familiar with Mitsubishi turbos, and even then maybe it won't. Mitsubishi wouldn't cough up the compressor maps for this turbo, but we did learn that peak compressor efficiency is a very healthy 77 percent.
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