This hybrid turbocharger is designed for the following engines: 2.5 TDI from the Volkswagen Transporter T4. Its modifications are based on a high-flow MFS compressor wheel, a 360° bearing retainer and high-speed balancing.
Three kit levels are documented: Stage 1, Stage 2 and Stage 2+. The choice must take into account the engine configuration and the intended electronic control system.
Available tuning options — Stage 1, Stage 2 and Stage 2+
Stage 1
Compressor wheel: MFS high-flow
Thrust bearing system: 360° thrust bearing
Balancing: High-speed at 150,000 rpm on a Cimat VSR test bench
This modification utilises a high-flow MFS impeller to d adjust the compression capacity and d air flow, without any documented housing modifications for this stage.
Stage 2
Compressor impeller: High-flow MFS oversized
d intake housing: Reprofiled for accommodate the new impeller oversized
Thrust bearing system: 360° thrust bearing
Balancing: High-speed balancing at 150,000 rpm on a Cimat VSR test bench
Stage 2 combines a oversized impeller with a d intake housing, re-profiled. This modification is designed to alter the compressor’s air displacement capacity d, with performance dependent on the overall engine configuration.
Stage 2+
Compressor impeller: MFS high-flow oversized
Intake housing d: Reprofiled for to accommodate the new impeller oversized
Bearing system: 360° thrust bearing
Balancing: High-speed balancing at 150,000 rpm on a Cimat VSR test bench
The available data for for the Stage 2+ indicates the same documented technical specifications: MFS impeller oversized, re-profiled housing, 360° thrust bearing and high-speed balancing. No other mechanical modifications are specified.
What is a hybrid turbo?
A hybrid turbo utilises a turbocharger architecture adapted for to accommodate modified internal components. Depending on the specification, modifications may involve the compressor wheel, its geometry, the housings, the turbine wheel, the thrust bearing system or the 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 impeller: the consistency between the components, the machining and the engine configuration remains crucial.
MFS compressor wheel: standard or Performance?
MFS stands for ‘Milled From Solid’, meaning a wheel machined from a solid block. This manufacturing method alone does not guarantee an increase in air flow. A standard MFS wheel may retain a geometry equivalent to that of the original d.
An MFS wheel Performance can feature a geometry tailored to the build. In this product, the wheel shown is made from forged aluminium; it is lighter, larger and taller than the original d. The technical data sheet indicates an additional compression capacity of 15 per cent.
A standard MFS impeller can be just as shiny 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 only be utilised properly 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 the arrangement of its blades influence its aerodynamic behaviour and the amount d of air it can move under certain conditions.
The result also depends on the housings, the turbine wheel, the boost pressure and the engine tuning. A larger wheel does not automatically guarantee better performance and may alter the response time as well as the range d of optimal operation.
Reliability and balancing of the hybrid turbo
The documented 360° thrust bearing distributes axial forces over a wide surface area. It helps the bearing adapt to operating stresses, without making the turbocharger insensitive to poor lubrication or incorrect fitting.
The rotor is balanced at high speed, up to 150,000 rpm, on a Cimat VSR test bench. This process helps to minimise vibrations and mechanical stresses during rotation.
Engine remapping and preparation
The engine management system must be adapted for fully utilise the characteristics of this hybrid turbo. The wastegate must be adjusted during the ECU remapping.
Depending on the level of tuning, it is also advisable to check or d adjust the fuel injection, boost pressure, exhaust system, cooling system and other components under stress. Fitting d a hybrid turbo alone does not guarantee a power gain.
Turbo specifications
OEM part numbers
074145703E
074145703EX
Manufacturer part numbers
454192-0001
454192-0005
454192-1
454192-5
Compatible vehicles and applications
Volkswagen
Transporter T4 — 100 hp
2,.5, TDI — from 1997, month and end date unspecified
Engine code: not specified
Transporter T4 — 151 hp
2,.,5 TDI — from 1997, month and end date unspecified
Engine code: not specified
Additional technical specifications
Product type: Hybrid Turbo
Engine: 2.5 TDI
Documented power outputs: 100 hp and 151 hp
Production period: From 1997
Engine codes: Not specified
Fitting advice
⚠️ 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 are clean, the inlet and that there are no foreign objects. Carry out priming in accordance with the applicable recommendations and follow the manufacturer’s instructions.
Failure to rectify a lubrication fault may result in the turbocharger failing again.
How do you identify the correct turbo?
Check the turbo’s part number d, the original OEM and manufacturer part numbers, as well as the make, model, generation, engine type, power output, production period and engine code.. An identical engine type is not always sufficient to confirm compatibility.
⚠️ 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 specification sheet. An identical engine specification does not always guarantee compatibility.
If in doubt, please contact us with the part number from your turbocharger.
