JB4 Fuel Pressure Upgrade Kit for 2020+ BMW B58/S58/B48

JB4 Fuel Pressure Control – for B58 Gen 2, B48 and S58 Engines

The Burger Motorsports JB4 Fuel Pressure Upgrade Kit adds a high-pressure fuel system connection to the JB4 controller, allowing it to adjust fuel pressure directly. This helps keep fuel corrections, or fuel trims, under control even under heavy engine load.

This upgrade often becomes useful when running E85 blends, which require considerably more fuel flow. The kit is intended for vehicles already equipped with a JB4 and includes an updated JB4 circuit board and a fuel pressure adapter harness that connects to the existing JB4 wiring harness.

Installation is straightforward and does not require replacing the complete JB4 system. The original JB4 circuit board is replaced with the updated board supplied in the kit, and the new connection is wired between the vehicle and the JB4 harness.

Product features

• Adds a connection between the JB4 and the high-pressure fuel system
• Allows the JB4 to control fuel pressure and fuel trims directly
• Designed for BMW B58 Gen 2, B48 and S58 engines
• Also suitable for B48- and B58-powered Toyota GR Supra Mk5 models
• Like the JB4 itself, it can also be used in vehicles with a locked ECU
• Relatively easy to install with an existing compatible JB4 system

Kit contents

• Updated JB4 circuit board
• Fuel pressure connection harness

Please note: This product is not compatible with first-generation Gen 1 B58 engines. It can only be used together with a compatible JB4 controller.

Suitable vehicle models include:
BMW 2 Series G42 M240i, 220i and 230i
BMW 2 Series F22/F23 225i and 230i, model years 2020–2021
BMW M2 G87
BMW 3 Series G20/G21 318i, 320i, 320e, 330i, 330e and M340i
BMW M3 G80 and M3 Competition
BMW 4 Series G22/G23/G26 420i, 430i and M440i
BMW 4 Series F32/F33/F36 425i and 430i, model year 2020
BMW M4 G82/G83 and M4 Competition
Toyota GR Supra Mk5 2.0 and 3.0, model years 2020–2026