This hybrid turbo for, designed for 2.5 TDI, features d an internal modification designed to adapt its compression capacity and d air flow.. Depending on the upgrade package chosen, it is fitted with a high-flow MFS compressor wheel, a 360° bearing stop and reprofiled housings.
It is designed plug & play to be fitted without any modifications d to the. vehicle’s installation. The documented applications cover several versions Volkswagen: T4, Transporter and T5 from 2003 onwards.
Available preparations — 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 and air flow rate d, whilst maintaining a configuration designed for for a Installation without modification.
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
The Stage 2 combines a oversized compressor impeller with a reprofiled d intake casing. This modification is designed to increase air displacement capacity d under appropriate operating conditions.
Stage 3
Compressor impeller: 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 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 version modifies the compressor and turbine sides. The final performance depends on the overall engine configuration, boost pressure and the settings applied.
What is a hybrid turbocharger?
A hybrid turbo uses a turbocharger architecture adapted for accommodate internal components that differ from the d'original configuration. Depending on the stage, modifications may involve the compressor wheel, the housings, the turbine wheel, the thrust bearing and the balancing.
The aim is d to adapt the compression capacity and the air flow rate d. A hybrid turbo is therefore not defined solely by the appearance of its compressor wheel, but by the coherence of the mechanical assembly as a whole.
MFS compressor wheel: standard or Performance?
MFS stands for ‘Milled From Solid’: the impeller is machined from a solid block. This manufacturing process alone does not guarantee an increase in air flow rate d.
A standard MFS impeller may retain a geometry equivalent to the original. An MFS Performance impeller may feature a geometry adapted to the modification, notably taller or wider blades, a different profile or a specific diameter, provided these characteristics are documented.
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. The impeller documented here is made of forged aluminium; it is lighter, larger and taller than the d'original, with a claimed 15 per cent higher compression capacity.
Why does the geometry of the blades influence the air flow rate d?
The compressor impeller draws in and then compresses the incoming air. Its diameter, profile, height, width and blade arrangement all influence its aerodynamic behaviour. An optimised geometry can move more d air under certain conditions, but the result also depends on the casings, the turbine, the boost pressure and the engine tuning. A larger impeller does not automatically guarantee better performance and may alter the response time.
Reliability and balancing of the hybrid turbo
The 360° thrust bearing distributes axial forces over a suitable surface. Rotor balancing limits vibrations and mechanical stresses: all three stages are balanced at 150,000 rpm on a Cimat VSR test bench. However, this balancing does not compensate for faults in assembly or lubrication.
Engine remapping and preparation
Appropriate engine management is required for to make the most of the hybrid turbo’s characteristics. Fuel injection, boost pressure, exhaust, cooling and transmission must be monitored or adjusted according to the tuning. The wastegate setting must be adjusted when reprogramming the ECU. No power gain is automatic without a coherent configuration.
Turbo part numbers
OEM part numbers
070145701H
070145701HV
070145701HV244
070145701HV246
070145701HV250
070145701HX
070145702
070145702AV
070145702AV100
070145702AX
Manufacturer’s part numbers
720931
720931-0001
720931-0002
720931-0003
720931-0004
720931-1
720931-2
720931-3
720931-4
Compatible vehicles and assignments
Volkswagen
T4 BUS — 131 hp
2.5 TDI — from 2003, end date unspecified
Engine code : unspecified
T4 BUS — 174 hp
2.5 TDI — from 2003, end date unspecified
Engine code : unspecified
Transporter (7H) — 163 / 174 hp
2.5 TDI — from 2003, end date unspecified
Engine code : unspecified
Transporter (7J, 7H) — 174 hp
2.5 TDI — from 2003, end date unspecified
Engine code : unspecified
Transporter 4MOTION (7H) — 174 hp
2.5 TDI — from 2003, end date unspecified
Engine code : unspecified
Transporter T5 — 174 hp
2.5 TDI — from 2003, end date unspecified
Engine code : unspecified
Additional technical specifications
Product type: Hybrid Turbo
Engine: 2.5 TDI
Power as indicated in the title: 131 hp
Installation: Plug & play, no modifications required
Documented period: From 2003, end unspecified
Engine code: Not specified
Installation advice
⚠️ WARNING — IMPORTANT BEFORE INSTALLATION
Identify and rectify the cause of the previous fault. Check the lubrication circuit, the oil supply and return lines d, the cleanliness of the pipes, and the intake, ensuring there are no foreign objects present.. 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 turbocharger failure.
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, body style, engine type, power output,Year and engine code.. An identical engine type does not always guarantee 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 data sheet. An identical engine specification does not always guarantee compatibility.
If in doubt, please contact us with the part number found on your turbocharger.
