BEST BUDGET OPTION: Holset Stock Replacement HY35W Turbo. RUNNER-UP: Aurora 3000 Turbo System with Optional Pulse Flow Exhaust Manifold. OUR TOP PICK: Calibrated Power 64mm Stealth Drop-In Turbo. At a Glance: Our Top Picks for Turbos For 5.9 Cummins.
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An electric turbo-compound ( ETC) system is defined where a turbine coupled to a generator ( turbogenerator) is located in the exhaust gas flow of a reciprocating engine to harvest waste heat energy and convert it into electrical power. Higher turbocharger efficiency means a lower exhaust pressure is required to meet the compressor’s power needs as illustrated by the two red curves. V/V d = 1 represents the engine displacement volume. The black curve is the Pv diagram for the in-cylinder process having a low pressure pumping loop (exhaust and intake strokes) and a high pressure loop (compression and expansion strokes). Collin says keeping the turbos operating at a lower RPM provides better boost ratios, cooler intake temps, better clutch control and still produces up to 100 lbs of boost to the engine and close to 1900 horsepower. The high-pressure turbo is a GTX4202R and the low-pressure turbo is a GTX5533R Gen II. A compound turbo system makes big boost and keeps both turbos in an efficient zone on the compressor map eliminating the use of intercoolers in this setup.While smaller in size, they are quick-spooling, great for towing, support 700 hp and can be had on a reasonable budget. One of the most prevalent compound turbo setups in the diesel industry bundles an S362 (BorgWarner based S300 unit) on top of the aforementioned S475, which acts as the atmospheric turbo on 5.9L or 6.7L Cummins engines. See all 6 photos The cutaway diagram details how the turbo feeds exhaust into the second turbine and the link between the turbine and the crankshaft via a hydraulic coupler.