So how do you measure this? For the shade tree mechanic this is difficult. This matching will produce the best combination of max horsepower and quick spool time. The length of this spin up process is called “spool time”.Īccording to standard turbo theory, your engine is happiest when the exhaust pressure and intake manifold pressures are identical throughout the RPM range. Larger exhaust turbines are also heavier, having more mass, hence it will take slightly longer spin up to produce build full boost. But the bigger the exhaust turbine is, the more exhaust can pass through easier, reducing back pressure. The bigger the turbine inside, typically the more air it can deliver at full boost. Each model usually has specs that explain the capabilities and limitations. Turbos are rated based on how much air they can deliver. Here we’ll explain the basics to understand the technology a little better when selecting your next turbo for your projector car. There are literally hundreds to choose from. Turbochargers come in many sizes and physical orientations for all kinds of applications.
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