Hi all,

I need some technical details for the VF-22 and the VF-23.

What are the AR's and wheel sizes for each of the above ?

Cheers,

J.

I do not know the answers to your question but I would ask what you would do with the info if I did know the answers?

Garrett produce full flow maps for their turbos (I have not seen IHI ones) but even they are difficult to read and to make really informed decisions over.

You have vane angles (at both ends) to consider which alter flow into and out of the engine.

Have you looked at the technical bit on our web site?

Hi there,

I am about to change my turbo, and I am after details on the standard ones fitted.

My replacement will be a so-called "hybrid", and I dont want to deviate to much from the standard spec, as to have a large adverse affect on lag, hence knowing the base figures would help. I will be replacing it with another IHI one.

These maps are helpful - but I've found them not always to be that accurate. *shrugs*

I suppose it'll have to be trial and error. Balancing the effectiveness of the turbo against lag.

Thanks for getting back to me.


Cheers,

J

Garrett vs IHI , interesting URL , check it out!

Whats a Hybrid tturbo?

Hi there,

The word "hybrid" is used very loosely...

You can buy standard turbos off the shelf which are available in certain sizes (size of turbine and exhaust wheels, housings, wastegates, etc). A hybrid turbo is one of these turbos which has been changed from the standard off-the-shel spec... For example its got different wheels in it... the housings have been changed, its been cut back or machined, it has a different wastegate. Turbos are built/customised for specific needs... road use... track.. drag... etc... The art or skill is choosing the base turbo and modifying it to obtain the most for your task. (minimising lag, developing boost, speed at which boost is generated, air flow rates, etc).

Hope this helps..

J.

ps - Mail me if you want a lot more technical description... the area of turbo design is massive

Here goes,


VF23 is from the STi v3/v4 and is the base used by A'PEXi for thier upgrade turbo. It is best suited to a stock 2.0litre engine (such as Turbo 2000, WRX).

VF22 is from the STi 22B. It is designed for a 2.2 litre block, and thus flows 10%-20% more air, so it exhibits greater boost threshold (about 500-1000rpm later on a 2.0 litre engine) but will provide more boost at a lower temperature.

Limits assuming a 2.0 litre EJ20 based engine:

VF23: Efficiency is to about 1.25 bar
VF22: Efficiency is to about 1.40 bar

If you have any further queries , please do not hesitate to email me or we can chat online with
ICQ (45940764)

Greg Nikolettos
BPM/AVO Marketing
Phone: (617) 3272-8885
Mobile: 0410 678 989
Fax: (617) 3218 8880

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