Turbos

Ensure proper sealing when installing the turbos on your N54.

Kit includes:

• 16 - ASA M7x39 studs
• 16 - Flange nuts
• All required gaskets and o-rings
• Water pump install hardware
• Replacement vacuum hose
• T-bolt clamps

Helpful hints:

For complete installation instructions, refer to Haynes Service Manual (T#193950).

Both downpipes must be removed to remove either front or rear turbo. Tie rod end may need to be separated from knuckle for clearance. Steering rack may also need to be rotated away from subframe for access. Valve cover heat shield will need to loosened and pushed upward to get clearance for turbo manifold removal.

If studs back out of cylinder head and nuts are seized to studs, replace studs. Thread studs in to head by hand to prevent cross threading. When installing the new studs in the cylinder head, use a high temperature loctite in the cylinder head side, and copper anti-seize on the nut side.

To make more room for access to the front turbo, remove the rubber line running in front of the subframe that attaches to the back of the map thermostat and remove the clip. Cut off the OEM clamp and replace it with a new hose clamp as well.

Complete removal of the water pump is not required. Detach the water pump from the side of the block and push it out of the way to make more room for access to the front turbo. If water pump is unbolted from the block, the aluminum bolts must be replaced.

Torque specs:
Bracket to cylinder head: 9Nm
Coolant supply line to crankcase: 9Nm
Coolant return line to crankcase: 8Nm
Coolant return line to turbo: 8Nm
Coolant supply line to supply line: 8Nm
Exhaust manifold heat shield: 8Nm
Oil supply line to crankcase: 20Nm
Oil pressure line to turbo: 8Nm
Oil return line to crankcase: 8Nm
Oil return line to turbo: 8Nm
Turbo manifold to head: 20Nm

Introducing Turbosmart’s OPR V2 Turbocharger Oil Pressure Regulator, a cutting-edge solution launched in 2022 that ensures steady oil pressure for your turbocharger. This innovative regulator features a return-less design with an integrated 44 Micron Stainless Steel Mesh Oil Filter, providing robust performance and protection.

The OPR V2 is the first of its kind, utilizing Turbosmart’s proprietary flow control method to maintain optimal oil pressure regardless of engine oil variables like pressure or temperature. It guarantees a smooth oil flow to your turbocharger, safeguarding critical components such as Exhaust Drive, Back & Charge Pressures from excessive oil pressure that could lead to oil consumption and smoke.

Gone are the days of guesswork with restrictors and complex plumbing for oil pressure regulation. The OPR V2 simplifies the process with its return-less, inline installation and the convenience of a built-in 44 Micron Oil Filter. This filter, made of serviceable and replaceable Stainless Steel Mesh, adds an extra layer of defense against engine oil debris that could harm your turbocharger.

Key Features:

Innovative Patent Pending Design Durable Aluminium (6262 T6) Anodised Body & Valve Regulated Oil Pressure Compatible with Most turbochargers Integrated Stainless Steel (304) Mesh Oil Filter -4AN Inlet and Outlet for easy installation 1/8 NPT Sensor/Gauge Port for monitoring Directional Inlet Feed Logic for optimized performance Laminar Flow Output for consistent oil delivery Compatible with all Engine Oils Designed and Manufactured in Australia

The Gen V WG38 Ultra-Gate 38 external wastegate is your cost-effective, high-performance solution. This 38mm external wastegate is meticulously designed for hassle-free bolt-on applications that make use of the 2-bolt flange.

Turbo maintenance has become part of our daily lives here. Our Service department does several turbo overhauls, wastegate adjustments, carbon cleaning, and upgrades every week. For the DIY owner, however, having a complete overhaul kit takes some of the stress out of 135/535 turbo replacement and this kit includes all of the basic items. It's highly likely N54 turbos will have to be replaced before 100,000 miles. Signs of a failing turbo are high oil consumption and blue smoke from exhaust (not from a leak or failing CCV system) because the internal oil seals are no longer retaining oil. Without critical lubrication and cooling effects from oil, the turbo shafts and bearings are usually the first to wear and that requires a complete rebuild. You might also see increased turbo lag or failure to hold boost, which is usually a sign of a failing wastegate or some other internal issue. With any internal problems the turbos need to be replaced. 

This package uses new (not rebuilt) Mitsubishi turbochargers (the original supplier to BMW). These are essentially direct replacement turbos but we went straight to the manufacturer instead of going through BMW. They are the same as the factory turbos but without a BMW logo so you save yourself a few hundred dollars. It includes everything that needs replacement during a 135 or 535 N54 twin turbo overhaul -

• Front and rear new OEM Mitsubishi turbos (the original supplier of BMW turbos)
• 1 gallon of Genuine BMW coolant
• ​16 - ASA M7x39 studs
• 16 - Flange nuts
• All required gaskets and o-rings
• Water pump install hardware
• Replacement vacuum hose
• T-bolt clamps

These are brand-new turbos so a core charge does not apply.

Upgrade your BMW's Turbo with the Mitsubishi N20 upgraded turbo from Turner Motorsport for enhanced performance without compromising reliability. Mitsubishi has meticulously crafted this turbo, replacing the cast compressor wheel with a new machined compressor wheel featuring a larger Exducer and Inducer. With a 58mm Exducer size (compared to the stock 56mm) and a 47mm Inducer size (compared to the stock 42mm), this turbo is engineered to move significantly higher amounts of air, elevating the peak horsepower from 245HP to an impressive 300HP!

• Turbocharger Spec: TD04L6R-04H*20TKS3-6T
• Exducer Size (mm): 58
• Inducer Size (mm): 47
• Allowable Max Boost: 32 PSI
• Engine Output (HP): 300 @ 6500rpm (20% power increase)

Kit includes:

• Upgraded Mitsubishi Turbocharger
• Installation hardware
• Upgrade for BMW Part # 11657642469