Ok, i grasp the differences between the VF30, 34, 22... but what the hell is a 23, a 29, and a few others? and what good are they for? the 34 is a typical sleeve bearing 30, only its BB correct? probably a little quicker spool and all the bb benefits.... then the 22 is like the "drag turbo" so to speak, slower spool, say 4200 so i hear, but top end like a hammer... the 30 is as responsive as the sleeve bearing turbos get, but it lacks the spool and a little efficiency when compared to the 34...

now im all screwed up, and i dont know what to do... this isnt for a target HP per say, its more to find out what each turbo is capable of, and compare em....

thanks in advance,
mark

 

anyone? ive looked all over the place, to no avail!

 

Here's a quick run down via some 'friends' on the web.

IHI VF22: This Turbo is a factory item on most limited edition WRX Type RA versions. Among all IHI units, this piece does utilize the largest P20 exhaust housing but still manages to spool rather quickly. Not only is this unit made from durable Niresist (turbine housing) and Inconel (turbine wheel), but also features the largest compressor inlet diamter of all the bolt on IHI units. With the right supporting equipment, 17 psi can be achieved by 3,000 RPM and a full 21-22 psi is reached with merely 250 more rpm. This turbo makes for an adequate streetable upgrade that combines quick responsiveness with a powerful midrange and topend curve. Adam used this turbo on his car afte completing the engine swap. After some careful tuning, it was enough turbo to propel his car to a 118 mph trap speed.

IHI VF23: This turbocharger was fitted to most 22B models by Subaru as standard equipment. The VF23 spools up with an absolute minimum of turbo-lag and although it's top end prowess is not as intense as a VF22, it does produce a very strong midrange. This is the primary upgrade to consider for street use or autocrossing; it is the heart of a truly all around performer.

IHI VF28: This turbo came standard on the STi Version 5. In terms of overall size, the is smaller than the VF22, VF30 and VF34, and the same size as the VF23.

IHI VF30: Another Subaru factory affair, this Turbo is installed on the latest edition STi version WRX from Japan (to 10/01). The VF30 represents the best bang for the buck Turbo to be used for street and strip use. The VF30 features an identical RHF55 housing as used in the larger VF22 which makes upgrades to the wheel increasingly easy. In terms of size, this turbo is almost as large as the VF22, and bigger than the VF23-29. This turbo features the venerable EZ18H turbine housing, 48 mm compressor inlet, and a compressor that while similar in design to the VF23-29, features a 6th blade for better performance across the rev range. This is a terrific all arounf turbo, and clearly our top seller. It's main characteristic is its linear power delivery, making it a perfect bolt on street turbo that can easily turn 12 second timeslips at the strip.

IHI VF34: This is IHI's newest bolt on upgrade for your WRX. This turbo was originally introduced on the Limited Edition STi Type RA Spec C. As of 10/01, this turbo comes standard on all STi versions in Japan. This turbo features the same specs as the VF30, but features an all ball bearing center section for even faster spool (about 250 rpm faster than the VF30 according to IHI).

If you're looking for a VF34, I have one in stock that I can give you for a SWEET price. PM if interested.