This hybrid turbocharger is designed for the Mitsubishi Pajero IV fitted with the 3.2 DI-D engine producing 170 hp. Depending on the tuning package selected, the upgrade combines a high-flow MFS compressor wheel, a 360° bearing stop and appropriate internal modifications.
Three levels of tuning are documented to dadapt the turbocharger’s characteristics to the engine project, without specifying a final power output.
Available tuning packages — 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 configuration primarily affects the compressor side. The high-flow MFS impeller is designed to adjust the compression capacity and air displacement d, whilst the 360° thrust bearing helps to distribute axial forces more evenly.
Stage 2
Compressor impeller: high-flow MFS oversized
dintake 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 Stage 2 combines a oversized compressor wheel with a reprofiled dintake housing. This modification allows the dhousing to correctly accommodate the new wheel and can alter the dair flow as well as the turbocharger’s response.
Stage 3
Compressor wheel: MFS high-flow oversized
d’intake housing: re-profiled for to accommodate the new impeller oversized
Bearing retainer: 360°
Turbine impeller: high-flow oversized
Turbine casing: re-profiled for ly to accommodate the new impeller oversized
Balancing: high-speed at 150,000 rpm on a Cimat VSR test bench
Stage 3 includes documented modifications to the compressor and turbine sides. The resizing of the impellers and the re-profiling of the housings affect flow capacity, but may also alter response time and the optimal operating range.
What is a hybrid turbocharger?
A hybrid turbo retains an architecture compatible with the intended application whilst incorporating internal modifications. Depending on the level of preparation, these may involve the compressor wheel, the turbine wheel, the housings, the thrust bearing system and balancing.
The aim is dto adapt the compression capacity and air flow rate dto the requirements dof an engine tuning programme. A hybrid turbo is therefore not defined solely by the appearance of its compressor wheel, but by the coherence of the entire mechanical assembly.
MFS compressor wheel: standard or ‘ Performance ’?
MFS stands for ‘Milled From Solid’, meaning a wheel machined from a solid block. This manufacturing process alone is not sufficient to ensure an increase in air flow d’air. A standard MFS wheel may retain a geometry equivalent to that d’of the original.
An MFS wheel Performance can be designed with a geometry suited to the vehicle’s specification, particularly in terms of its profile, dimensions or the shape of its blades. On this product, the MFS wheel is described as a forged aluminium wheel, lighter, larger and taller than the original d, with a compression capacity claimed to be 15 per cent higher.
A standard MFS impeller can be just as effective 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 result in increased 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 and the amount dof air displaced under certain operating conditions.
The result also depends on the casings, the turbine wheel, the boost pressure and the engine set-up. A larger wheel is not automatically preferable in all situations: it can also alter the response time and the range dof optimal operation.
Reliability and balancing of the hybrid turbo
The 360° thrust bearing, featured on the three documented stages, distributes axial forces over a wide surface area. It helps the bearing adapt to the stresses encountered by the turbocharger.
The assembly is balanced at high speed, at 150,000 rpm, on a Cimat VSR test bench. This process aims to minimise vibrations and mechanical stresses on the rotor, without compensating for poor installation or inadequate lubrication.
Engine remapping and preparation
The engine mapping and wastegate settings must be adjusted during remapping in order to d’exploit the characteristics of the hybrid turbo. The management of boost pressure must remain consistent with the chosen configuration.
dDepending on the level of tuning, the fuel injection, exhaust, cooling, intake, clutch or transmission may also require inspection or adjustment. Fitting a hybrid turbo does not automatically result in a power gain without appropriate engine tuning.
Turbo part numbers
OEM part number
1515A026
Manufacturer reference
VT12
Compatible vehicles and applications
Mitsubishi
Pajero IV — 170 hp
3.2 DI-D — period unspecified
Engine code: not specified
Additional technical specifications
Product type: Hybrid Turbo
Engine: 3,., 2 DI-D
displacement: 3.2 L
Power: 170 hp
Installation: no vehicle modifications required
Installation advice
⚠️ WARNING — IMPORTANT BEFORE INSTALLATION
Identify and rectify the cause of the previous fault. Check the lubrication circuit, the oil supply and return d, as well as the cleanliness of all pipes.
Check the inlet for any foreign objects. Carry out the priming procedure in accordance with the applicable guidelines and follow the manufacturer’s instructions.
A lubrication fault that is not rectified may result in the turbocharger failing again.
How do you identify the correct turbo?
Check the part number marked on the original turbo dand compare it with the OEM and manufacturer part numbers in this data sheet. Also check the make, model, generation, engine type, power output, the installation period and the engine code where available. An identical engine specification does not always mean that turbochargers are interchangeable.
⚠️ 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 from your turbocharger.
