The Red Zone
The supercharger was working as advertised at 6 psi until we approached 6,000 rpm, where it really took off. With nearly 9 pounds of boost at 7,000 rpm on pump gas, you'd expect the engine to explode, but the cylinder pressure (BMEPs) didn't spike along with boost. High-rpm restrictions in the cylinder heads backed up the boost in the intake manifold, causing a reading that was inaccurate. With larger heads or a larger engine, the boost reading would have gone down and the horsepower would have gone up. View Related Article
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