* Proper Supercharger Selection: The supercharger itself needs to be capable of producing at least 15 psi of boost. This depends on the supercharger's displacement (size), efficiency, and the engine's RPM range. A smaller supercharger might struggle to reach 15 psi, while a larger one might easily exceed it.
* Pulley Size: The size of the supercharger's drive pulley significantly affects boost pressure. A smaller pulley spins the supercharger faster, increasing boost. A larger pulley slows it down, reducing boost. Achieving 15 psi often involves using a smaller pulley than the stock configuration. This, however, increases stress on the supercharger and related components.
* Engine Management System (EMS) Tuning: This is absolutely crucial. The EMS (e.g., ECU) controls fuel delivery, ignition timing, and other parameters. To safely run at 15 psi, the EMS needs to be carefully tuned by a professional to provide the correct amount of fuel and ignition timing to prevent detonation (engine knock), which can cause catastrophic engine damage. This requires specialized software and equipment. A improperly tuned system at 15psi is a recipe for engine failure.
* Intercooler (Often Required): At 15 psi, the air compressed by the supercharger will be very hot. An intercooler is almost always necessary to cool the compressed air before it enters the engine. Hot, dense air is less efficient and more prone to detonation.
* Supporting Modifications: High boost levels (like 15 psi) often necessitate other modifications, such as:
* Upgraded fuel injectors: To supply the increased fuel demand.
* High-flow fuel pump: To keep up with the increased demand.
* Strengthened connecting rods and pistons: To handle the increased stress on the engine.
* Upgraded exhaust system: To help reduce backpressure.
In short, running a supercharger at 15 psi isn't a simple process. It requires a combination of hardware selection (supercharger, pulley, intercooler, etc.) and sophisticated software tuning (EMS tuning) by someone with extensive experience in forced induction systems. Attempting this without proper expertise is extremely risky and can lead to serious engine damage. Always consult with a professional tuner for any significant boost upgrades.
