wrx IHI Turbo There are many different types of turbos for the subaru Wrx/ STi. We decided to break down the IHI turbos and explain which each one does and how it will effect your power in your wrx. The VF22 has the highest output potential of all of the VF series turbo's and is the best choice for those who are looking for loads of top end power. The top end power however, does not come without a cost. The VF22 spools significantly slower than the rest of the turbo models due to the larger P20 exhaust housing and is much less suited for daily driving than some of the other models. Although the largest VF series, the VF22 turbo is not quite optimal for stroked engines or those who wish to run more than 20PSI of boost. The VF22 Turbo is best mated with the 2.0 block and in applications of 20lbs of boost or less.
The VF30 turbo is commonly considered the best bang for the buck turbo in the IHI VF turbo series line. A relatively new model the VF30 features the the same exhaust housing as the VF24 turbo but a larger compressor side similar to the VF22 . The combination of these two parts results in increased output potential without the lag associated with the VF22 turbo. Although it doesn't offer the top end supremecy of the VF22 turbo, the VF30 turbo is a great compromise between these unit and the quicker spooling models.
The VF34 turbo is nearly identical to the VF30, with the same exhaust housing and compressor. However the VF34 turbo goes back to the ball bearing design, and in doing so achieves full boost approximately 500RPM sooner than the comparable VF30 turbo. The VF34 turbo is the most recent turbo design and as such costs slightly more than its counterpart. Top end performance and maximum output are identical to the VF30 turbo.
This turbo is considered a great all-around turbo. Like the VF22 turbo it utilizes the largest P20 exhaust housing. This housing is mated with a smaller compressor housing of the of the VF24 turbo for fast response and excellent low and mid-range performance. It does not have the same top end power of the VF22 turbo, but spools up significantly quicker. Standard ball bearing center section. Excellent bolt-on replacement for the standard WRX turbo on cars without any other major modifications. Expect flows around 430 CFM at 18 PSI.
VF24 This turbo shares its compressor housing with the VF23 turbo however, this housing is mated with a smaller (P18) exhaust side. The smaller characteristics of this turbo allow it to provide ample bottom end power and quick spool. This turbo is very popular for Imprezas with automatic transmissions and Group N rally cars. Not recommended for stroker engines or engines with high boost as turbo is small and can over speed. Best turbo for cars that want the best bottom end and least turbo lag. Expect flows around 425 CFM at 18 PSI
VF28 This turbo came standard on the STi Version 5. In terms of overall size, it is smaller than the VF22 turbo, VF30 turbo and VF34 turbo, and about same size as the VF23 turbo. Expect flows around 425 CFM at 18 PSI
VF29 This turbo is nearly identical to the VF24 turbo, with the same compressor and exhaust housings. However the compressor wheel in the VF29 turbo is has been changed slightly. The changes made to the compressor wheel in this model are generally viewed as improvements, and as such this unit is typically chosen over the VF24 turbo. Has a different location for the pressure hose on the waste gate actuator Expect flows around 425 CFM at 18 PSI.The VF35 turbo utilizes the same compressor housing as the VF34 however it also features a divided thrust or offset ball bearing design. The smaller P15 turbo exhaust housing for quicker spool up and a slightly more limited top end. The compressor inducer size is the same as a VF30 turbo /or 34 turbo. Wrx unlimited sells many of IHI turbo models including. - VF22 turbo
- VF23 turbo
- VF24 turbo
- VF30 turbo
- VF34 turbo
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