What BMW models does the B58 Swap Bible cover?

The B58 Swap Bible covers five BMW chassis: E30 (1982-1994), E46 (1998-2006), E9x including E90/E91/E92/E93 (2005-2013), E39 5-Series (1995-2004), and E38 7-Series (1994-2001). Each chassis has its own dedicated guide with chassis-specific part numbers, torque specs, wiring, and fabrication instructions.

How much does a B58 engine swap cost?

A complete B58 swap into an E9x chassis typically costs between $6,700 and $14,800 depending on whether you choose budget or premium components. This includes the engine ($3,000-$5,500), ZF 8HP transmission ($1,200-$2,500), wiring and ECU ($800-$1,500), cooling system ($400-$800), motor mounts ($300-$600), and supporting modifications.

What experience level do I need for a B58 swap?

The guide is designed for intermediate to advanced DIY mechanics who are comfortable with basic automotive work, wiring, and fabrication. All 19 phases are broken down into detailed step-by-step instructions with diagrams.

Is the B58 better than the N54 for an E9x swap?

The B58 offers significant advantages over the N54: more reliable twin-scroll turbo, closed-deck block, integrated exhaust manifold, and better fuel efficiency. The B58 makes 335hp stock compared to the N54's 300hp, with far greater tuning potential and reliability.

What transmission works with a B58 swap in an E9x?

The ZF 8HP (8-speed automatic) is the recommended transmission for a B58 E9x swap. Specifically, the 8HP45 from a 2016+ 340i (F30) or 2019+ 330i (G20) is a direct bolt-on to the B58. The 8HP50 and 8HP75 also work but are heavier. For transmission control, options include the CANTCU standalone controller, TurboLamik TCU adapter, or MaxxECU with transmission control. The guide covers all three solutions with complete wiring diagrams.

What wiring is needed for a B58 swap into an E90 or E92?

A B58 E9x swap requires a custom engine wiring harness that integrates the B58 DME (Digital Motor Electronics) with the E9x JBE (Junction Box Electronics) via CAN-Bus. Key connections include the 6-pin drive-by-wire accelerator pedal, CANTCU splice map with 14 specific pins for transmission control, immobilizer defeat coding, and digital A/C compressor signal conversion. The B58 Swap Bible includes complete pin-by-pin wiring diagrams for all 19 build phases.

What is the difference between B48 and B58 for an engine swap?

The B48 is a 2.0L turbocharged inline-4 producing 248hp stock, while the B58 is a 3.0L turbocharged inline-6 producing 335hp stock. The B48 is lighter (approximately 40 lbs less), more fuel efficient, and costs $1,000-$2,000 less for the swap. The B58 offers more power potential (500+ hp with bolt-ons) and the signature BMW inline-6 sound. Both use the same ZF 8HP transmission family and share similar mounting points. The B48 is ideal for budget builds under $8,000, while the B58 is preferred for performance builds targeting 400+ hp.

Do I need custom motor mounts for a B58 E9x swap?

Yes, the B58 requires custom motor mounts for E9x installation because the B58 mounting points differ from the N52/N54/N55 engines the E9x was designed for. Options include fabricated steel mounts (cheapest, $200-$300), polyurethane adapter mounts from specialty manufacturers ($400-$600), or solid aluminum competition mounts ($500-$800). The B58 Swap Bible includes fabrication templates and exact measurements for DIY motor mount creation in Phase 1.

What ECU coding is required for a B58 swap?

B58 E9x swap ECU coding involves three main areas: NCS Expert for VO (Vehicle Order) modification and Park/Neutral safety bypass, ProTool for Android-based chassis coding as an alternative workflow, and DME flashing via MHD or Bootmod3 for chassis delete and base tune calibration. The B58 DME must be coded to remove references to missing F-series modules (iDrive, digital cluster) and the E9x JBE must accept the B58 CAN signals. xHP transmission tuning (Stage 3) with adaptation drive protocol is also covered.

What cooling system modifications are needed for a B58 E9x swap?

The B58 uses a split-cooling (dual-loop) system that differs from the E9x's single-loop design. The swap requires routing separate coolant circuits for the engine block and cylinder head, installing a B58-compatible thermostat housing, upgrading to a larger radiator (E9x 335i radiator works well), and adding an auxiliary electric water pump. The B58 Swap Bible covers the complete dual-loop plumbing layout with hose sizes, clamp specifications, and bleeding procedures in Phase 2.

What parts do I need for a B58 E9x swap?

A complete B58 E9x swap requires: B58 engine with turbo and accessories ($3,000-$6,000), ZF 8HP45 transmission with mechatronics ($1,200-$2,500), custom motor mount adapters ($200-$600), custom wiring harness or donor harness with DME ($400-$1,200), CANTCU or equivalent transmission controller ($300-$500), cooling system components including radiator and electric water pump ($440-$1,120), fuel line routing kit with AN-6 fittings ($80-$200), 3-inch downpipe and custom midpipe ($350-$1,000), and fluids including BMW Longlife-04 oil and ZF Lifeguard 8 ATF ($130-$190). Total parts cost ranges from $6,700 for a budget build to $18,750 for a premium build.

What tools do I need for a B58 engine swap?

Essential tools for a B58 E9x swap include: a 2-ton engine hoist with leveler, 3-ton jack stands (set of 4), metric socket sets (8-22mm) in 6-point, Torx sockets T20-T60, triple-square (XZN) sockets M6-M12 (BMW-specific), E-Torx sockets E8-E20, a digital multimeter, ratcheting wire crimpers, a torque wrench (calibrated), B58 VANOS timing tool set, and BMW fuel line disconnect tools. Budget approximately $200-$500 if you already have basic tools, or $1,200-$2,500 starting from scratch.

What fuel system modifications are needed for a B58 E9x swap?

The B58 uses a direct-injection system operating at up to 350 bar (5,076 PSI). For the E9x swap, the stock in-tank fuel pump supports up to approximately 400 hp. You need to run a new AN-6 braided stainless feed line from the E9x firewall fitting to the B58 fuel rail using an M12x1.5 adapter. The B58 is a returnless system, so no return line is needed. For E85 or 500+ hp builds, upgrade the in-tank pump (Walbro 450 or DW400) and consider upgraded HPFP internals from Nostrum or CSF.

How do I route the exhaust for a B58 in an E9x?

The B58's integrated exhaust manifold positions the turbo lower and closer to the engine than the N54. Use an F30 340i 3-inch downpipe (VRSF or CTS Turbo) and cut it approximately 8 inches after the turbo flange to weld a 15-degree bend for E9x subframe clearance. A custom stainless midpipe (18-30 inches of 3-inch 304 stainless) connects the downpipe to the factory E9x cat-back. Heat shielding is critical near motor mounts, steering rack, and wiring. Always use V-band clamps at every joint.

E46 Subframe Reinforcement: Required or Overkill for B58 Power?

Name: B58 Swap Bible — Complete Engine Swap Manuals
Brand: B58 Swap Bible
Price: 39.00 USD
Availability: InStock

E46 subframe reinforcement sizing for B58 power: bushings, braces, or full cage.

By B58 Swap Bible · 2026-06-30

The E46 subframe failure is legendary. With B58 power, reinforcement isnt optional.

Failure Mode

Subframe shifts under hard acceleration.

Options

Poly bushings: 60%. Turner brace: 95%. Full cage: 100%.

Installation

Budget $600-$1,200. 4-5 hours removal.

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