Old Smokey has seen many varieties of turbochargers on his truck including a dual stage intercooler setup between each turbo to cool the temperatures. In this configuration, the turbos are operating outside of the max efficiency range which produces higher intake temperatures and therefore needs an intercooler to lower intake temps. In diesel truck applications a compound turbo system is necessary for low end response so the high-pressure turbo on this build is a GTW3884R and the low-pressure turbo is a G42-1450. Old Smokey is a diesel powered race truck with a compound turbo system that was built for racing Pikes Peak, track days, and having fun at Hoonigans Donut Garage. Scott Birdsall – Chuckles Garage Old Smokey F1 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. The desire to squeeze more boost from a turbo system would have taken a single turbo out of its efficiency zone and turned it into a heat pump. This Mitsubishi Eclipse has a 2.2L 4G63 engine with a compound turbo setup using two Garrett turbochargers and makes about 1900 horsepower. Jett Racing – AustraliaĬollin Wilshire with Jett Racing in Australia has worked years on mastering the science behind compound setups for his race car which is the world’s fastest 4-cylinder compound turbo car with a 6.2 second ¼ mile at 229 MPH. In the examples below, we will show you two different compound turbo configurations used in racing applications. The wastegated gasses from the high-pressure turbo are diverted back into the header pipe to be used or wastegated again depending on the shaft speed of the low-pressure turbo. One or two wastegates are typically used to control turbo shaft speed allowing the turbos to operate in their desired efficiency zones. The exhaust flow piping is opposite of the charge air path with the high-pressure turbo connected to the exhaust manifold and the larger/ low-pressure turbo downstream of the flow, with the exhaust gasses leaving the system through the exhaust.
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