2003 Mustang Cobra With A Boost - Unstable Compounds - Tech
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Compound vs. Turbo-Only (HP)For this test, the compound system was set up to produce a peak boost pressure (at the power peak) of 20 psi. Due to the nature of a Roots-style supercharger, the boost pressure was not consistent throughout the rev range, peaking at 23 psi around 4,700 rpm and dropping off to just 20 psi at 6,200 rpm. Running a peak of 23 psi and 20 psi at the power peak, the compound system managed to produce 625 hp. Running the same 20 psi of boost at the power peak, the turbo-only combination produced 801 hp.Naturally, the compound system offered more low-speed power, but from 3,700 rpm all the way to redline, the turbo-only system outperformed the compound system. With the exception of the launch, the engine speed will always exceed 3,700 rpm after each shift, meaning the extra 175 hp offered by the turbos will be in full effect. Run heads-up, the turbo-only combination would easily walk away from the compound system in a drag race. View Related Article
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