Complete in-house rebuild service for IHI turbochargers. Subaru VF series from VF22 through VF60, Ferrari F40 and 488, Porsche Cayenne, GM Duramax, and the full range of IHI OEM applications. Ball bearing and journal bearing. In-house VSR balancing since 2008.
IHI uses the VF designation across the Subaru performance lineup. The VF number does not follow a simple size progression; it reflects the specific combination of compressor housing, turbine housing, and bearing type built for a particular Subaru application. Two turbos with consecutive VF numbers can have entirely different performance characteristics.
IHI uses two bearing systems across the VF lineup. Ball bearing units spool faster and are generally found on higher-spec JDM applications and later USDM turbos. Journal bearing units are common on earlier USDM WRX and some STI applications. Both are fully supported at Boost Lab.
| Model | Subaru OEM # | Bearing | Scroll | Application |
|---|---|---|---|---|
| VF22 | 14411AA070 | Ball | Single P20 | JDM WRX / STI EJ20 early, largest flow VF |
| VF23 | 14411AA130 | Ball | Single P20 | JDM WRX EJ20, large housing small wheel |
| VF24 | 14411AA150 | Ball | Single P18 | JDM WRX EJ20 / Rally / automatic |
| VF28 | 14411AA200 | Ball | Single P20 | JDM STI Version 5 EJ207 |
| VF29 | 14411AA220 | Ball | Single P18 | JDM WRX EJ20 improved compressor wheel |
| VF30 | 14411AA373 | Journal | Single P18 | JDM STI EJ20, popular budget option |
| VF34 | 14411AA340 | Ball | Single P18 | JDM STI EJ207, same size as VF30 BB |
| VF35 | 14411AA443 | Journal | Single P15 | JDM WRX Type RA, fast spool small housing |
| VF36 | 14411AA490 | Ball | Twin P25 | JDM STI Spec C 2003+, Ti shaft twin scroll |
| VF37 | 14411AA542 | Journal | Twin P25 | JDM STI V8/V9 Spec-C EJ207 twin scroll |
| VF38 | 14411AA560 | Ball | Twin P18 | JDM Legacy GT, fast spool Ti turbine shaft |
| VF39 | 14411AA572 | Journal | Single P18 | USDM STI 2004-2006 EJ257 |
| VF40 | 14411AA530 | Journal | Single P18 | USDM Legacy GT 2005-2007 EJ255 |
| VF41 | 14411AA610 | Journal | Single P18 | JDM Forester STI EJ207 |
| VF43 | 14411AA620 | Journal | Single P18 | USDM STI 2007 EJ257, larger wastegate than VF39 |
| VF45 | 14411AA650 | Journal | Single P18 | JDM WRX / Legacy EJ20 2004+ |
| VF48 | 14411AA700 | Journal | Single P18 | USDM STI 2008-2021 EJ257 / EJ257B |
| VF49 | 14411AA690 | Journal | Twin Scroll | JDM STI 2008-2014 EJ207 twin scroll |
| VF52 | 14411AA800 | Journal | Single P18 | USDM WRX 2009-2014 EJ255 |
| VF54 | 14411AA760 | Journal | Single P18 | USDM Legacy GT 2008-2012 EJ255 |
| VF57 | 14411AA830 | Journal | Single P18 | USDM WRX 2015-2021 FA20DIT (turbo frame only) |
| VF60 | 14411AA900 | Journal | Single | Subaru Levorg / BRZ tS JDM applications |
IHI supplies turbochargers to Subaru, Porsche, GM, Ferrari, and a wide range of OEM automotive and diesel applications globally. We rebuild all of them. The Subaru VF lineup is our highest IHI volume but no platform is excluded.
The USDM WRX runs IHI from 2008 onward with the VF52 being the most common rebuild unit. The 2002-2007 WRX uses the Mitsubishi TD04L (see our MHI page for those). From 2008 the WRX received the VF52 (2009-2014 EJ255), VF54 on Legacy GT (2008-2012), and VF57 on the FA20DIT-powered 2015+ WRX. The VF52 is a journal bearing single scroll unit capable of 300+ WHP with supporting modifications and proper fueling. Oil starvation from the Subaru banjo bolt restriction is the most common rebuild cause on all WRX IHI units.
The USDM STI has run IHI VF series turbos through its entire US production life. VF39 on the 2004-2006 STI, VF43 on 2007 (with an enlarged wastegate), and VF48 on the 2008-2021 EJ257 STI. All three are journal bearing single scroll units on the RHF55 frame. The VF48 is the most common STI rebuild unit we see. JDM STI owners with VF49 (twin scroll, journal) and VF36/VF37 (twin scroll) units are also fully supported.
The JDM VF lineup covers the EJ20 and EJ207 performance variants used in JDM WRX, STI, Legacy GT, and Forester STI applications. The ball bearing units (VF22, VF23, VF24, VF28, VF29, VF34, VF36, VF38) deliver faster spool than their USDM journal bearing counterparts. VF36 and VF38 introduced titanium turbine shafts for reduced inertia. VF36 uses a twin scroll housing unique to the Spec C STI. These units are increasingly imported and we rebuild all configurations.
The EJ255 Legacy GT and Forester XT platforms use dedicated VF variants tuned for their specific boost and power targets. VF40 on 2005-2007 USDM Legacy GT, VF54 on 2008-2012 USDM Legacy GT, VF41 on JDM Forester STI, and VF45 on JDM WRX. The Legacy GT applications frequently come in with oil contamination and coking from the longer oil passages on the horizontally-opposed engine in a sedan application. Rebuild process and turnaround are identical to WRX and STI units.
The first-generation Porsche Cayenne Turbo (2003-2007, 948 engine, 4.5L V8 twin turbo) uses IHI RHF5H units. Two turbos per car, identified by IHI part codes VVQ1 and VVQ2. Journal bearing water-cooled units. Common failures are oil coking from the extreme heat environment in the Cayenne engine bay and bearing wear from extended oil intervals on a high-performance V8 twin turbo platform that many owners treat as a daily driver. Both turbos should be rebuilt together when either fails.
The 2001-2004 6.6L Duramax LB7 uses an IHI RHF5 turbocharger as OEM equipment. The LB7 Duramax is known for injector failures, and when those fail they push excessive fuel into the cylinder, which washes the engine oil and damages the turbo through oil contamination and coking. Every LB7 IHI rebuild should verify the injector issue has been addressed before the rebuilt turbo goes back on the engine. The IHI RHF5 on the LB7 is a rebuildable unit and we stock the components for fast turnaround.
The RHF series covers a wide range of OEM applications including Isuzu Trooper and Rodeo diesel (RHF5), various Daihatsu engines, early Subaru non-VF applications, Yanmar industrial, and KIA/Daewoo diesel platforms. The newer RHS and RHZ series are designed as interchangeable upgrades to the RHF line with improved aerodynamics and bearing design. Contact us with your nameplate part number if your application is not listed here.
IHI supplies the turbochargers on two of the most significant Ferrari road cars ever produced. The Ferrari F40 (1987-1992) runs twin water-cooled IHI RHB53LW units on its Tipo F120A 2.9L V8. The IHI model codes are VU12B (left) and VU13B (right). The Ferrari 488 GTB, 488 Spider, 488 Pista, and F8 Tributo use IHI VU21 and VU22 twin turbos, both water-cooled ball bearing units designed for sustained high output. We have rebuilt both F40 and 488 turbos in-house. Contact us before shipping for any Ferrari IHI unit to confirm parts availability and turnaround.
Search by Subaru OEM part number, IHI VF model, IHI model code, or application. Subaru uses the 14411-XXXXXX format for all OEM turbo part numbers. IHI internal part numbers and model codes are stamped on the CHRA nameplate tag. If your number is not listed, contact us with the nameplate code and we can identify your unit.
| Subaru / OEM Part # | IHI Model | Engine | Application | Notes |
|---|---|---|---|---|
| Subaru WRX (USDM) | ||||
| 14411AA800 | VF52 | EJ255 2.5L | 2009-2014 Subaru WRX (USDM) | Journal Bearing / Single Scroll |
| 14411AA800D | VF52 | EJ255 2.5L | 2009-2014 Subaru WRX (USDM) | Journal Bearing / Single Scroll |
| Legacy / Forester / JDM | ||||
| 14411AA760 | VF54 | EJ255 2.5L | 2008-2012 Subaru Legacy GT (USDM) | Journal Bearing / Single Scroll |
| 14411AA760D | VF54 | EJ255 2.5L | 2008-2012 Subaru Legacy GT (USDM) | Journal Bearing / Single Scroll |
| Subaru WRX (USDM) | ||||
| 14411AA830 | VF57 | FA20DIT 2.0L | 2015-2021 Subaru WRX (USDM) | Journal Bearing / Single Scroll |
| Subaru STI (USDM) | ||||
| 14411AA572 | VF39 | EJ257 2.5L | 2004-2006 Subaru STI (USDM) | Journal Bearing / Single Scroll P18 |
| 14411AA620 | VF43 | EJ257 2.5L | 2007 Subaru STI (USDM) | Journal Bearing / Larger Wastegate |
| 14411AA700 | VF48 | EJ257 / EJ257B 2.5L | 2008-2021 Subaru WRX STI (USDM) | Journal Bearing / Single Scroll P18 |
| VA440057 | VF48 | EJ257 2.5L | 2008-2021 Subaru STI (USDM) alternate | IHI Internal Code |
| VB440057 | VF48 | EJ257 2.5L | 2008-2021 Subaru STI (USDM) alternate | IHI Internal Code |
| VC440057 | VF48 | EJ257 2.5L | 2008-2021 Subaru STI (USDM) alternate | IHI Internal Code |
| JDM STI Twin Scroll | ||||
| 14411AA490 | VF36 | EJ207 2.0L | JDM STI Spec-C 2003+, Ti shaft twin scroll | Ball Bearing / Twin Scroll P25 |
| 14411AA542 | VF37 | EJ207 2.0L | JDM STI V8 / V9 Spec-C EJ207 | Journal Bearing / Twin Scroll P25 |
| 14411AA690 | VF49 | EJ207 2.0L | JDM STI 2008-2014 EJ207 Twin Scroll | Journal Bearing / Twin Scroll |
| 14411AA070 | VF22 | EJ20 2.0L | JDM WRX / STI EJ20 early, largest VF | Ball Bearing / Single Scroll P20 |
| JDM Performance VF Series | ||||
| 14411AA130 | VF23 | EJ20 2.0L | JDM WRX EJ20 large housing small wheel | Ball Bearing / Single Scroll P20 |
| 14411AA150 | VF24 | EJ20 2.0L | JDM WRX EJ20 / Rally / automatic | Ball Bearing / Single Scroll P18 |
| JDM STI Twin Scroll | ||||
| 14411AA200 | VF28 | EJ207 2.0L | JDM STI Version 5 EJ207 | Ball Bearing / Single Scroll P20 |
| JDM Performance VF Series | ||||
| 14411AA220 | VF29 | EJ20 2.0L | JDM WRX EJ20 improved compressor | Ball Bearing / Single Scroll P18 |
| JDM STI Twin Scroll | ||||
| 14411AA373 | VF30 | EJ207 2.0L | JDM STI EJ20 single scroll | Journal Bearing / Single Scroll P18 |
| 14411AA340 | VF34 | EJ207 2.0L | JDM STI EJ207 ball bearing version of VF30 | Ball Bearing / Single Scroll P18 |
| JDM Performance VF Series | ||||
| 14411AA443 | VF35 | EJ20 2.0L | JDM WRX Type RA fast spool small housing | Journal Bearing / Single Scroll P15 |
| 14411AA560 | VF38 | EJ20 2.0L | JDM Legacy GT Ti shaft twin scroll | Ball Bearing / Twin Scroll P18 |
| Legacy / Forester / JDM | ||||
| 14411AA530 | VF40 | EJ255 2.5L | USDM Legacy GT 2005-2007 | Journal Bearing / Single Scroll P18 |
| JDM STI Twin Scroll | ||||
| 14411AA610 | VF41 | EJ207 2.0L | JDM Forester STI | Journal Bearing / Single Scroll P18 |
| JDM Performance VF Series | ||||
| 14411AA650 | VF45 | EJ20 2.0L | JDM WRX / Legacy EJ20 2004+ | Journal Bearing / Single Scroll P18 |
| 14411AA900 | VF60 | Various | Subaru Levorg / JDM applications | Journal Bearing |
| Legacy / Forester / JDM | ||||
| 14411AA510 | VF45 / Legacy | EJ255 2.5L | 2005-2007 Subaru Legacy GT (USDM) early | Journal Bearing |
| Porsche Cayenne | ||||
| VVQ1 | RHF5H VVQ1 | 4.5L V8 948 | 2003-2007 Porsche Cayenne Turbo (Bank 1) | IHI OEM Journal Bearing |
| VVQ2 | RHF5H VVQ2 | 4.5L V8 948 | 2003-2007 Porsche Cayenne Turbo (Bank 2) | IHI OEM Journal Bearing |
| VD430066 | RHF5H VVQ1 | 4.5L V8 948 | 2003-2007 Porsche Cayenne Turbo | Alternate IHI Code |
| VD430067 | RHF5H VVQ2 | 4.5L V8 948 | 2003-2007 Porsche Cayenne Turbo | Alternate IHI Code |
| GM Duramax LB7 | ||||
| 8973077111 | RHF5 | 6.6L Duramax LB7 | 2001-2004 GM 2500HD / 3500 Duramax | IHI OEM / GM Part# |
| 8971884545 | RHF5 | 6.6L Duramax LB7 | 2001-2004 GM 2500HD / 3500 Duramax | IHI OEM Alternate |
| Isuzu OEM | ||||
| VIBF | RHF5 | 4JB1T | Isuzu Trooper / Rodeo 4JB1T | IHI Model Code |
| VIBS | RHF5 | 4JA1T | Isuzu Rodeo 4JA1T | IHI Model Code |
| VICF | RHF5H | 4JX1T | Isuzu Trooper 4JX1T | IHI Model Code |
| VICI | RHF5H | 4JX1T | Isuzu Trooper 4JX1T | IHI Model Code |
| Ferrari | ||||
| VU12B | RHB53LW (Left / LH) | F120A 2.9L V8 | 1987-1992 Ferrari F40, Left Turbo | IHI Water-Cooled |
| VU13B | RHB53LW (Right / RH) | F120A 2.9L V8 | 1987-1992 Ferrari F40, Right Turbo | IHI Water-Cooled |
| VU21 | IHI VU21 (Left) | F154CB 3.9L V8 Twin Turbo | 2015-2020 Ferrari 488 GTB / Spider / Pista, Left Turbo | IHI Ball Bearing Water-Cooled |
| VU22 | IHI VU22 (Right) | F154CB 3.9L V8 Twin Turbo | 2015-2020 Ferrari 488 GTB / Spider / Pista, Right Turbo | IHI Ball Bearing Water-Cooled |
| VU21 | IHI VU21 (Left) | F154CD 3.9L V8 Twin Turbo | 2019-2021 Ferrari F8 Tributo / Spider, Left Turbo | IHI Ball Bearing Water-Cooled |
| VU22 | IHI VU22 (Right) | F154CD 3.9L V8 Twin Turbo | 2019-2021 Ferrari F8 Tributo / Spider, Right Turbo | IHI Ball Bearing Water-Cooled |
No results for your number? Contact us at sales@theboostlab.com with the nameplate code from your turbo and we can identify it.
IHI turbos are well-engineered OEM units. Nearly every failure we see has an external root cause, the most predictable of which is the Subaru oil feed restriction. Understanding what caused the failure is the first step in every rebuild we do.
The single most common root cause of VF series turbo failures. The oil feed line on EJ-series engines connects to the cylinder head via a banjo bolt. This bolt develops a restriction over time, reducing oil flow to the turbo bearing housing on startup when the turbo is spinning up from cold. Subaru issued a service bulletin specifically addressing this issue and recommends replacing the banjo bolt any time the turbo is replaced. If this bolt is not replaced at the same time as the turbo rebuild, the rebuilt unit faces the same oil restriction from day one. We flag this on every Subaru VF rebuild report.
Subaru recommends 3,000-mile oil change intervals on turbocharged EJ engines. Extended intervals with conventional oil, or any interval with synthetic that has degraded under boost and heat, allow oil to break down inside the bearing housing. The degraded oil leaves carbon deposits that restrict passages and accelerate bearing wear on the next cold start. Turbocharged EJ and FA engines are punishing on oil. Short intervals with a quality full synthetic are the single best preventive measure after the banjo bolt replacement.
The USDM VF39, VF43, VF48, VF52, and VF54 are all journal bearing units. Journal bearings require a film of pressurized oil between the shaft and bearing surface. On a cold engine, oil is thick and slow to reach operating pressure. Boosting hard on a cold start, before oil has reached the turbo at full pressure, allows the shaft to contact the bearing surface directly, scoring both. This is accelerated by any restriction in the oil feed line. Let the engine warm up before demanding boost, every time.
Cracked intercooler pipes, loose clamps on aftermarket intake hardware, and broken boost leak test plugs left in the intake are frequent causes of compressor wheel damage on modified Subaru platforms. Debris ingested at compressor speeds causes blade tip erosion or bending. Even minor tip damage creates an imbalance that accelerates bearing failure at high RPM. Aftermarket cold air intakes and large intercooler kits with poorly fitting couplers are the main culprit. Every compressor wheel is inspected at teardown for ingestion damage.
The Cayenne Turbo twin turbo setup packs two IHI RHF5H units into an extremely tight V8 engine bay running sustained high loads. The thermal environment is significantly more demanding than a typical passenger car turbo application. Hot shutdowns after spirited driving trap heat in the bearing housings with no active oil circulation. Over time this produces heavy oil coking in both CHRA units. Both turbos must be rebuilt together, since running a fresh unit alongside a worn one creates imbalanced boost conditions and shortens the life of the new unit.
The 2001-2004 Duramax LB7 is notorious for injector failures that allow diesel fuel to wash into the crankcase. Diluted engine oil loses its film strength and viscosity immediately, starving bearings throughout the engine including the IHI RHF5 turbo. An LB7 IHI rebuild without confirming the injector issue has been resolved will result in the same contamination damaging the rebuilt turbo. We flag this in every LB7 rebuild report. If the injectors have not been replaced or tested, that work needs to happen before the turbo goes back on.
We have been rebuilding IHI turbos since 2008. VF series parts are stocked in-house for the most common units. Every rebuild includes a complete teardown, root cause identification, bearing replacement, and in-house VSR balancing. Every Subaru VF rebuild report includes a call-out on the banjo bolt; we will not send a rebuilt turbo back without flagging it.
Full disassembly and photography. Root cause identified before parts are ordered. On Subaru units we document oil passage condition and coking level and include banjo bolt replacement recommendation in every report.
Journal bearings, thrust bearing, and thrust washer replaced. Ball bearing cartridge replaced on BB units (VF22, VF23, VF24, VF28, VF29, VF34, VF36, VF38). CHRA cleaned and oil passages inspected.
Compressor and turbine wheels inspected for ingestion damage and erosion. All piston rings replaced. Seal plates and o-rings inspected and replaced as needed.
Every rebuilt CHRA dynamically balanced in-house above OEM specification before final assembly. Not sent out.
Housings cleaned and inspected. Shaft play verified within tolerance. Turbo photographed and packaged for return shipment with rebuild report.
Start your rebuild request in our repair system. VF48 and VF52 parts stocked for fast turnaround. Every job documented from intake through return shipment.
Start Your Rebuild Request37833 Pineapple Ave Unit A • Dade City, FL 33523 • sales@theboostlab.com