This hybrid turbocharger is designed for for the 2.7 engines with 250 hp, as documented on certain Audi A6 and Allroad models from 2000 onwards.. The upgrade comprises a high-flow MFS compressor wheel, a 360° bearing stop and high-speed balancing on a Cimat VSR test bench.
The three tuning levels on offer differ in terms of wheel size and casing reprofiling. Installation is designed for the plug & play configuration, without any modifications to the peripheral system.
Available configurations — 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 wheel in order to d adapt the air flow rate d whilst retaining a configuration closer to the original d design.
Stage 2
Compressor impeller: MFS high-flow oversized
Compressor housing: Reprofiled inlet for accommodate the new impeller oversized
Thrustbearing: 360° thrust bearing
Balancing: High-speed balancing at 150,000 rpm on a Cimat VSR test bench
oversized ’s compressor impeller requires the housing to be re-profiled d'intake. This configuration is designed to achieve a higher flow capacity, with performance that depends on the mapping and the overall engine tuning.
Stage 3
Compressor impeller: MFS high-flow oversized
Compressor housing: Reprofiled intake for to accommodate the new impeller oversized
Thrustbearing: 360° thrust bearing
Turbine wheel: High-flow oversized
Turbine housing: 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 alters both the compressor and turbine sides.. The larger dimensions may improve flow under certain conditions, but may also alter the response time and the range d' optimal performance.
What is a hybrid turbo?
A hybrid turbo utilises a turbocharger architecture designed for accommodate internal modifications. Depending on the stage, these may involve the compressor wheel, the turbine wheel, the housings, the thrust bearing and the rotor balancing.
The aim is d to adapt the compression capacity and air flow rate d. However, a hybrid turbo is not defined solely by the appearance of its compressor wheel: the geometry of the wheels and the adaptation of the housings 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 and does not, on its own, guarantee an increase in airflow d'air. The wheel documented here is made from forged aluminium.
A standard MFS wheel can retain a geometry equivalent to that of the d original. An MFS wheel Performance can be given a geometry tailored to the tuning objective, for example a different profile or dimensions where such modifications are intended.
A standard MFS impeller can be just as polished as an 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 airflow can contribute to an increase in power only when combined with appropriate engine tuning.
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 arrangement of its blades all influence its aerodynamic behaviour. The result also depends on the housings, 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 360° thrust bearing distributes the axial forces around the turbocharger’s axis. Each documented stage also benefits from d'high-speed balancing at 150,000 rpm on a Cimat VSR test bench to minimise vibrations and stresses on the rotor. This balancing does not compensate for faults in assembly or lubrication.
Engine remapping and preparation
The engine management system must be adapted for to make full use of the hybrid turbo’s characteristics. The mapping, boost pressure and wastegate settings must be checked during remapping. Depending on the level of tuning, the fuel injection, exhaust, cooling and transmission may also require checking or adjustment. The turbo alone does not guarantee a power gain.
Turbo part numbers
OEM Reference
078145703Q
Manufacturer’s part numbers
53039700069
K03-069
53039800069
53039880069
53039900069
Compatible vehicles and assignments
Audi
A6 2.7 i — 250 hp
Engine 2.7i — from 2000, end date unspecified
Engine code: not specified
A6 2.7 i — 250 TDI hp
Engine variants: 2.7 i TDI — from 2000, end date unspecified
Engine code: not specified
Allroad 2.7 i — 250 hp
Engine variants: 2.7 — from 2000, end date unspecified
Engine code: not specified
Additional technical specifications
Product type: Hybrid Turbo
Documented engine variants: 2.7 TDI, 2.7T and 2.7i
Power: 250 hp
Period: From 2000, end unspecified
Engine code: Not specified
Assembly instructions
⚠️ WARNING — IMPORTANT BEFORE INSTALLATION
Identify and rectify the cause of the previous fault. Check the lubrication circuit, as well as the oil supply and return d. Check that the pipes and inlet are clean and free from foreign objects.
Prime the system in accordance with the applicable recommendations and follow the manufacturer’s instructions. A lubrication fault that is not rectified may lead to further damage to the turbocharger.
How do you identify the correct turbo?
Check the part number of the original turbo d, the OEM and manufacturer part numbers, as well as the make, model, engine type, power output, installation period and engine code.. An identical engine may be fitted with several different turbo set-ups.
⚠️ Check your turbo’s part numbers
Before ordering, compare the part number marked on your original turbo d with the part numbers listed in this guide. An identical engine specification does not always guarantee compatibility.
If in doubt, contact ALFI TURBO with the part number clearly visible on your original turbocharger d.
