Turbo Inlet Restrictor – A system to limit engine performance that meets these criteria. The inlet restrictor shall have a single, circular opening through which all inlet air passes. The maximum ID of the restrictor is listed on the vehicle’s spec line. The restrictor’s maximum ID must be maintained for at least 3 mm. This 3 mm restrictor segment shall be placed within 50 mm of the rotating section (impeller assembly) of the pressurizing unit. On engines where the approved turbo prohibits meeting this distance, different locations may be approved by the CRB on a case by case basis. If an alternative location is approved, the entire restrictor assembly shall have a maximum length of 50 mm. There shall be no other provisions for airflow to the turbocharger other than through this single orifice.
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