This hybrid turbocharger, designed for certain 1.9 TD engines with 75 hp, features d an internal modification programme aimed at increasing compression capacity and air flow d. Depending on the upgrade package chosen, the documented modifications relate to the MFS compressor wheel, the housings, the turbine impeller, the bearing thrust ring and the balancing.
The specifications listed cover, in particular, the Seat Toledo Series 1, Volkswagen Golf III and Volkswagen Passat B3 or B3.5. Installation is designed for the plug & play configuration, without any modifications d'installation.
Available kits — Stage 1, Stage 2 and Stage 3
Stage 1
Compressor wheel: MFS high-flow
Bearing thrust: 360°
Balancing: high-speed at 150,000 rpm on a Cimat VSR test bench
This modification affects the compressor section in order d to adapt the flow rate d to the air. The 360° thrust bearing helps to distribute the rotor’s axial forces more evenly.
Stage 2
Compressor impeller: MFS high-flow oversized
d' intake housing: re-profiled for accommodate the new impeller oversized
Bearing thrust ring: 360°
Balancing: high-speed at 150,000 rpm on a Cimat VSR test bench
The reprofiling of the housing allows d to accommodate the compressor wheel oversized. This configuration may alter the air flow capacity d and the behaviour of the turbocharger.
Stage 3
Compressor wheel: MFS high-flow oversized
d'intake housing: re-profiled for to accommodate the new impeller oversized
Bearing stop: 360°
Turbine impeller: high-flow oversized
Turbine casing: reprofiled for ly to accommodate the new impeller oversized
Balancing: high-speed at 150,000 rpm on a Cimat VSR test bench
This modification involves changes to both the compressor and turbine sides. The sizing of the impellers and the re-profiling of the housings must be taken into account when preparing and tuning the engine.
What is a hybrid turbo?
A hybrid turbo utilises a turbocharger architecture adapted for accommodate modified internal components. Depending on the service, the preparation may involve the compressor wheel, the housings, the turbine wheel, the thrust bearing or 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 geometry of the components and how they are combined 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 air flow rate d. A standard MFS wheel may retain a geometry equivalent to that d of the original.
The MFS impeller documented at for for this specification is made of forged aluminium and features a lighter, larger and taller geometry than that of d'the original'. Depending on the upgrade package, it is available in a high-flow version or oversized.
A standard MFS impeller can be just as efficient 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 flow rate can go hand in hand with an increase in power when the engine tuning is correctly adapted.
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. A suitable geometry can move more d air under certain conditions, but the result also depends on the housing, the turbine wheel, the boost pressure and the engine tuning. A larger wheel therefore does not automatically guarantee a better result and may alter the response time.
Reliability and balancing of the hybrid turbo
The 360° bearing stop present on all three stages helps to distribute axial forces. It must operate with proper lubrication and does not eliminate the need to check the entire oil circuit d.
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, without compensating for any faults in assembly, lubrication or the presence d of a foreign object.
Engine remapping and preparation
Appropriate engine management is required for to make the most of the hybrid turbo’s characteristics. The mapping, boost pressure and wastegate settings must be checked. Depending on the level of tuning, the fuel injection, exhaust system, cooling system, the intake, the clutch or the gearbox may also require checking or adjustment. The turbo alone does not guarantee a power gain.
Turbo specifications
OEM part number
028145701s
Manufacturer’s part numbers
454065-2
454065-0002
454065-5002s
Compatible vehicles and applications
Seat
Toledo Series 1 — 75 hp
1.9 TD — started in 1991, month unspecified — end unspecified
Engine code : unspecified
Volkswagen
Golf III — 75 hp
1.9 TD — started in 1991, month unspecified — end unspecified
Engine code : unspecified
Passat B3 — 75 hp
1.9 TD — started in 1988, month unspecified — end unspecified
Engine code : unspecified
Passat B3.5 — 75 hp
1.9 TD — launched in 1993, month unspecified — end date unspecified
Engine code : unspecified
Additional technical specifications
Product type: hybrid turbo
Engine: 1.9 TD
Power: 75 hp
Installation: plug & play, no modifications required d' installation
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 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, generation, engine type, power output, mountingYear and engine code.. The same engine type may have several different mounting configurations.
⚠️ 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 you are unsure about compatibility, please contact us with the part number from your original turbo d.
