![]() ![]() But, the basic rule holds true that the final output pressure of a compound system is roughly the input pressure to the first turbo times the pressure ratios of all turbos in the system. This is where sequential turbos come in, as they do things a bit differently. ![]() Obviously you can get different boost pressures by varying the pressure ratio at which each turbo is operating (remember, pressure ratio is a dynamic thing, changing all the time as conditions change). This is why compounds easily produce such high boost pressures. The discharge pressure from the 2nd turbo is 135 psi. The sequential turbo system helped cut down on the infamous turbo lag associated with high-performance applications by first employing a smaller turbo that spooled up quickly at low rpm. The second turbo doesn't care what the actual input pressure is, it's still operating at a pressure ratio of 3:1. Now, instead of directing the output of that turbo into the engine, let's instead direct it into the inlet of a second turbo, which for convenience's sake is also operating at a pressure ratio of 3:1. So, at 45 psi discharge pressure, the compressor is operating at a pressure ratio of 3:1. ![]() The system has one small turbocharger for the low-engine. Atmospheric pressure is (rounded up) about 15 psi. development of a Sequential Twin Turbo System, which is considered the best charging method for RE.
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