The Bullseye Turbo Generation 4 Race Cover introduces patented tunable compressor technology that enables racers and tuners to customize airflow with precision. This article covers the technical features and provides straightforward instructions for installation and adjustment.

Gen 4 Race Cover Technology

Bullseye Power’s Generation 4 Race Cover is engineered for dynamic tuning, featuring a threaded inlet bell that allows adjustment of the map groove width for optimal powerband performance. Each full turn of the inlet bell changes the groove by 1/16 inch, with an adjustment range from 0 to 6 full turns. Rotating the bell clockwise closes the groove, while counterclockwise opens it. This adjustability makes it easy to fine-tune surge margin and airflow response to match different racing setups and track conditions.

Installation and Adjustment Steps

• Spin the inlet bell by hand, applying only gentle force. Never use tools or excessive pressure—precise machining means it seats tightly when closed.

• Avoid removing the inlet bell. If it’s taken out, reinstallation can risk cross-threading and severe damage.

• To adjust, visually check the groove opening through the inlet:

• Clockwise to close.

• Counterclockwise to open.

• Secure the inlet bell using the three nylon-tipped set screws. Apply red thread locker and torque the screws evenly between 15-17 inch-pounds.

• After first heat cycles or heavy use, check set screw tightness to ensure the bell remains secure and avoids making contact with the compressor wheel.

Tuning Tips and Warnings

• Never force the bell closed; gentle turning is enough for a secure seat.

• Tighten locking screws evenly to keep the bell centered and prevent contact with moving parts.

• If the bell is removed, reintroduce with extreme caution to avoid damaging the threads.

Application

The Generation 4 Race Cover is utilized on Bullseye's NLX series and other advanced turbo models designed for motorsports and high-performance street use. The tunable inlet gives racers quick, precise control over airflow and surge properties, supporting immediate adjustment for custom builds and track or street demands.

This patented technology provides a strong combination of adjustability, reliability, and race-ready performance for leading-edge turbocharger setups.