Supercharger Boost Control System by SmoothBoost - GM/ Factory LT4 Supercharger

LT4 Boost Control System – SmoothBoost Active Bypass

Unlock precision control over your GM LT4 supercharger with the SmoothBoost LT4 Boost Control System. Designed to replace the factory vacuum-based bypass valve with a reliable electronic actuator, this system delivers smoother throttle response, improved tunability, and smoother driveability—even with aggressive cams or big boost setups.

This boost control system uses a direct 0–5 V signal from throttle position, not manifold vacuum, for precise bypass valve operation. Expect:

• Enhanced drivability with linear throttle-to-power delivery

• Elimination of vacuum-related issues like boost spikes and lag

• Ability to dial boost down 80% without changing pulleys

• Boost scramble and boost kill features to integrate with track-specific electronics

This kit includes the SmoothBoost controller and is compatible with stock or modified LT4 systems. No plugging or guesswork—just bolt-on performance. Backed by expert engineering from SmoothBoost and their USA-based support team, this is the smart upgrade your LT4-powered ride needs.