2: Subaru IHI VF se­ries

NZ Performance Car - - Scrapyard Gains -

IHI is known for pro­duc­ing high-qual­ity tur­bocharg­ers for both au­to­mo­tive and com­mer­cial ap­pli­ca­tions. Subaru re­leased its world-beat­ing WRX STI with IHI tur­bos, and to this day they are still in high de­mand.

Sev­eral dif­fer­ent VF-se­ries tur­bos have been re­leased through­out the years, but some are more po­tent than oth­ers. The early-shape Ver­sion 3 STI was re­leased with the VF22 turbo, which has the largest po­ten­tial for peak power of any VF turbo. The VF22 has a very large (for an OEM turbo) P20 ex­haust hous­ing, and it’s also ball bear­ing, which al­lows this com­pact unit to flow up­wards of 20–24psi depend­ing on the ap­pli­ca­tion. A few Subaru tuners have seen as much as 298kW at the fly­wheel on th­ese tur­bos. If you’re af­ter some­thing a bit more mod­ern, the VF36 turbo re­leased on the JDM STI Spec C from 2003 on­wards is the best op­tion, it fea­tures a twin-scroll ex­haust hous­ing, ball bear­ings and a ti­ta­nium tur­bine wheel and shaft. This will flow around 298kW at the fly­wheel, and be a lot more re­spon­sive com­pared with the older VF22. Th­ese tur­bos have dif­fer­ent turbo flanges, so make sure to check when retrofitting one to your ve­hi­cle. The VF36 fea­tures a four-bolt twin-scroll flange, whereas the VF22 has a three-bolt sin­gle-port flange.

Although a fairly small tur­bocharger, the VF22 sup­ports big num­bers with quick re­sponse. Some Subaru tuners have seen up­wards of 290kW on race fuel with the VF22

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