This hybrid turbo for engine options Volkswagen 2.5 TDI between 88 and 102 hp is available in three levels of preparation. Each configuration uses an MFS compressor wheel Performance with a 6+6 geometry, a 360° bearing stop and high-speed balancing.
The documented assignments relate in particular to Volkswagen California T4 and Transporter T4 available as a minibus, panel van and chassis cab.
Available products — Stage 1, Stage 2 and Stage 2+
Stage 1
Compressor wheel: High-capacity MFS Performance
Documented dimensions: 35.00 / 49.90 mm
Blade configuration: 6+6
Level: 360° stop
Balancing: high speed at 150,000 rpm on a Cimat VSR test bench
This modification alters the compressor wheel so that d'adjust the travel capacity' d'air, whilst maintaining the intended configuration' for one Installation without modification documented external.
Stage 2
Compressor wheel: High-capacity MFS oversized Performance
Documented dimensions: 36.83 / 54.90 mm
Blade configuration: 6+6
Carter d'Admission:' re-profiled for to receive the wheel oversized
Level: 360° stop
Balancing: high speed at 150,000 rpm on a Cimat VSR test bench
The wheel oversized and the re-profiling of the casing d'The intake valves are designed to regulate the flow of air'. The resulting behaviour also depends on the engine management system and other aspects of the configuration.
Stage 2+
Compressor wheel: High-capacity MFS oversized Performance
Documented dimensions: 42.37 / 60.50 mm
Blade configuration: 6+6
Carter d'Admission:' re-profiled for to receive the wheel oversized
Level: 360° stop
Balancing: high speed at 150,000 rpm on a Cimat VSR test bench
This configuration is based on a larger wheel and a specially designed housing. A larger size does not in itself guarantee better performance in all conditions and may affect response time and range d'optimal use'.
What is a hybrid turbo ?
A hybrid turbo retains a suitable turbocharger design for to receive modified internal components. Depending on the design, these modifications may relate to the compressor impeller, its dimensions, the geometry of the blades, the casings, the turbine impeller, the thrust bearing system or the balancing process.
The aim is d'adjust the compression capacity and flow rate' d'air'. A hybrid turbo is therefore not defined solely by the appearance of its impeller: the balance between the components and the engine tuning remains essential.
MFS compressor wheel: standard or Performance ? ?
MFS stands for ‘Milled From Solid’, meaning a wheel machined from a solid block. This manufacturing process does not, on its own, guarantee an increase in throughput d'air'. A standard MFS wheel can retain a geometry equivalent to that d'origin'.
A standard MFS wheel can be just as shiny as an MFS wheel Performance. It is not its appearance that determines its performance, but its geometry and its ability to move more d'air'. A wheel Performance can be fitted with blades of a profile, dimensions or configuration suited to the preparation task. A higher flow rate can contribute to an increase in power when the engine and its control system are set up accordingly.
Why does the geometry of the blades affect the flow rate? d'air?' ?
The compressor wheel draws in and then compresses the air intended for the engine. Its diameter, profile, height, width and the arrangement of its blades all influence its aerodynamic behaviour. The right geometry can move more d'air under certain conditions, but the result also depends on the casings, the turbine wheel, the boost pressure and the engine tuning'. A larger wheel can also affect the response time.
Reliability and balancing of the hybrid turbocharger
The documented 360° stop distributes axial forces over a wide area. The rotor is balanced at high speed – up to 150,000 rpm on a Cimat VSR test bench – in order to minimise vibrations and mechanical stresses. However, this balancing does not compensate for either incorrect installation or inadequate lubrication.
Engine remapping and tuning
The farm d'A hybrid turbo may require adjustments to the engine mapping, boost pressure and fuel supply'. Exhaust, air cooling d'The intake, clutch or gearbox must also be checked, depending on the level of preparation'. The wastegate must be adjusted during fitting and remapping. No increase in power is automatic without proper configuration.
Turbo part numbers
OEM part numbers
074145701A
074145701AV
074145701AX
Manufacturer’s part numbers
53149707018
53149807018
53149887018
53149907018
K14-7018
Compatible vehicles and assignments
Volkswagen
California T4 Camper (7DJ, 7DK, 70J) — 88 hp
2.5 TDI Diesel — May 1998 to April 2003
Engine codes: AJT, AYY (from October 2001) for AYY)
California T4 Camper (7DJ, 7DK, 70J) — 102 hp
2.5 TDI Diesel — May 1998 to April 2002
Engine codes: ACV, AUF, AYC — AUF: November 1999 to November 2001
Transporter T4 Bus (70B, 70C, 7DB, 7DK) — 88 hp
2.5 TDI Diesel — May 1998 to April 2003
Engine codes: AJT, AYY
Transporter T4 Bus (70B, 70C, 7DB, 7DK) — 102 hp
2.5 TDI Diesel — September 1995 to April 2003
Engine codes: ACV, AUF, AYC
Transporter T4 Bus (70B, 70C, 7DB, 7DK) — 102 hp
2.5 TDI Diesel — January 1996 to April 2003
Engine codes: ACV, AXL
Transporter T4 Platform/Chassis (70E, 70) — 88 hp
2.5 TDI Diesel — May 1998 to April 2003
Engine codes: AJT, AYY
Transporter T4 Platform/Chassis (70E, 70) — 102 hp
2.5 TDI Diesel — September 1995 to April 2003
Engine codes: ACV, AUF, AYC
Transporter T4 Platform/Chassis (70E, 70) — 102 hp
2.5 TDI Diesel — May 1998 to April 2003
Engine codes: ACV, AXL
Transporter T4 Van (70A, 70H, 7DA, 7DH) — 88 hp
2.5 TDI Diesel — December 1998 to April 2003
Engine codes: AJT, AYY
Transporter T4 Van (70A, 70H, 7DA, 7DH) — 102 hp
2.5 TDI Diesel — September 1995 to April 2003
Engine codes: ACV, AXL
Transporter T4 Van (70A, 70H, 7DA, 7DH) — 102 hp
2.5 TDI Diesel — September 1995 to April 2003
Engine codes: ACV, AUF, AYC
Additional technical specifications
Product type: hybrid turbo
Engine: 2.5 TDI
displacement : 2.5 l
Fuel: Diesel
Powers: 88 / 102 hp
Engine codes: ACV, AJT, AUF, AXL, AYC, AYY
Documented periods: September 1995 to April 2003, depending on the assignment
Assembly instructions
⚠️ WARNING — IMPORTANT BEFORE ASSEMBLY
Identify and rectify the cause of the previous fault. Check the lubrication circuit, the supply and the return d'the oil and the cleanliness of the pipes'.
Check the intake and ensure there are no foreign objects present. Carry out the priming in accordance with the relevant guidelines and follow the manufacturer’s instructions.
If a lubrication fault is not rectified, it may lead to the turbocharger failing again.
How do you choose the right turbo ?
Check the reference number engraved or marked on the turbocharger d'origin', then compare the OEM and manufacturer part numbers. Also check the make, model, generation, body style, engine type and power output in hp, the years of manufacture and the engine code. Having the same motor does not always guarantee compatibility.
⚠️ Check your turbo’s part numbers
Before placing your order, Compare the part number on your turbocharger d'origin' using the references given in this fact sheet. Having the same motor does not always guarantee compatibility.
If you are in any doubt, please contact us with the full part number of your turbocharger d'Vehicle origin and details'.
