This right-hand-side hybrid turbo is designed for RS6 Audi s fitted with the 4.2 V8 engine producing 450 or 480 hp. The upgrade combines a high-flow MFS compressor wheel, a 360° bearing stop and high-speed balancing, with additional modifications depending on the chosen package.
Designed for with external Installation without modification, it is available in three documented tuning levels. To make the most of its performance characteristics, a coherent engine configuration and suitable electronic control unit are required.
Available tuning packages — Stage 1, Stage 2 and Stage 3
Stage 1
Compressor wheel: MFS high-flow
Thrustbearing: 360° thrust bearing
Balancing: High-speed balancing at 150,000 rpm on a Cimat VSR test bench
This modification primarily affects the compressor impeller in order d to adjust the compression capacity and d the air flow rate, whilst maintaining a controlled mechanical configuration.
Stage 2
Compressor impeller: MFS high-flow oversized
d' intake housing: Reprofiled for accommodate the new impeller oversized
Thrustbearing: 360° thrust bearing
Balancing: High-speed balancing at 150,000 rpm on a Cimat VSR test bench
Reprofiling the housing allows d to fit the compressor wheel oversized. This modification may alter the air flow d and the compressor’s behaviour depending on the boost pressure and engine tuning.
Stage 3
Compressor wheel: MFS high-flow oversized
d'intake housing: Reprofiled for to accommodate the new impeller oversized
Thrustbearing: 360° thrust bearing
Turbine impeller: High-flow oversized
Turbine casing: Reprofiled for ly to accommodate the new impeller oversized
Balancing: High-speed balancing at 150,000 rpm on a Cimat VSR test bench
This modification applies to the compressor and turbine sides. The sizing of the impellers and the re-profiling of both housings can promote higher flow rates, but may also alter the response time and the optimal operating range.
What is a hybrid turbocharger?
A hybrid turbo retains an architecture compatible with the intended installation whilst incorporating adapted internal components. Depending on the stage, the modification may involve the compressor wheel, the turbine wheel, the housings, the thrust bearing and balancing.
The aim is to d ‘adapt the compression capacity and air flow rate d ’. However, a hybrid turbo is not defined solely by the appearance of its impeller: the geometry, dimensions, machining of the housings and the overall coherence of the assembly are crucial.
MFS compressor wheel: standard or ‘ Performance ’?
MFS stands for ‘Milled From Solid’, meaning a wheel machined from a solid block. This technology describes the manufacturing process, but does not in itself guarantee an increase in air flow d.
A standard MFS impeller may retain a geometry equivalent to that of the original d. An MFS Performance impeller may adopt a geometry tailored to the tuning objective, for example in terms of the profile, height or width of the blades and the diameter.
A standard MFS impeller can be just as effective as a custom-made MFS impeller Performance. It is not its appearance that determines its performance, but its geometry and its ability to move more d air. A higher flow rate can support greater power output when the engine is correctly tuned, though this alone does not guarantee a performance gain.
Why does the geometry of the blades influence the air flow rate d?
The compressor impeller draws in and then compresses the air sent to the engine. Its diameter, profile, height, width and the arrangement of its blades influence the compressor’s aerodynamic behaviour.
dThe right geometry can move more air under certain conditions. The result also depends on the casings, the turbine wheel, the boost pressure and the mapping. A larger wheel therefore does not automatically guarantee better performance and may alter the response time.
Reliability and balancing of the hybrid turbo
The documented 360° thrust bearing distributes axial forces over a wide surface area. It helps the system adapt to operating stresses, without eliminating the risks associated with insufficient lubrication or incorrect installation.
The rotor is balanced at high speed, up to 150,000 rpm, on a Cimat VSR test bench. This process aims to minimise vibrations and mechanical stresses on the rotating assembly.
Engine remapping and preparation
The engine management system must be adapted for to make the most of the hybrid turbo’s characteristics. The wastegate must be adjusted during the ECU reprogramming.
Depending on the level of tuning, the fuel injection, exhaust system, cooling, boost pressure and transmission must be checked or adjusted. A hybrid turbo does not automatically deliver a power gain without a coherent engine configuration.
Turbo specifications
OEM part number
077145704K
Manufacturer part numbers
53049700029
53049880029
Compatible vehicles and applications
Audi
RS6 4-.2i — 450 hp
Engine: 4-.2i — from 2002, end date unspecified
Engine code: not specified
RS6 4.2i — 480 hp
Engine 4.2i — from 2004, end date unspecified
Engine code: not specified
Additional technical specifications
Product type: Hybrid Turbo
Position: Right-hand side
Engine: 4-., 2 V8
Power outputs: 450 hp and 480 hp
Installation: No external modifications required
Fitting advice
⚠️ WARNING — IMPORTANT BEFORE INSTALLATION
Identify and rectify the cause of the previous fault. Check the lubrication circuit, the oil supply and return d, as well as the cleanliness of all lines. Check the intake for any foreign objects, then prime the system in accordance with the applicable recommendations. Follow the manufacturer’s instructions. A lubrication fault that is not rectified may lead to further turbocharger failure.
How do you identify the correct turbo?
Check the turbo part number d, the original OEM and manufacturer part numbers, as well as the make, model, engine type, power output,Year and engine code.. An identical engine type does not always guarantee compatibility, particularly where there are multiple configurations or left-hand and right-hand versions.
⚠️ Check your turbo’s part numbers
Before ordering, compare the part number marked on your original d turbo with the part numbers listed in this data sheet. An identical engine specification does not always guarantee compatibility.
If you are unsure about the identification or the side of fitment, please contact us before placing your order.
