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looking at my turbos off EA82T they are clearly IHI VF, but where do you get the other numbers from like VF2, VF4 coz the next lot of numbers look like part numbers and serial numbers, both punched, oddly enough. each has a two set of numbers. One has a number following VF that begins with a 2, the other turbo is VF and number begins with 5 ?

Having recently had mine off it definately had 'IHI VF2' punched onto the
little plate. I'm sure it also had a part number and maybe serial number as you mention.

BTW.... whats the diff between vf2 & 4?

timmo

VF is cast on both, as in raised letters, the rest are punched numbers


difference sounds to be age, 2 being older

Hi all , from what I've read the family is IHI (MHI) RHB52 VF2 or VF4 .

I could fill a telephone book with sizes trims and part numbers for Garrett GT BB turbos but not IHI .

The only person I know of whos altered them is I believe Garath from Crossbred Performance . He mentions that there is a cartridge (centre section) that uses the same turbine but with a slightly larger compressor wheel , the aim being not so much more boost pressure but slightly greater airflow to help extend the engines useful power range upwards rpm wise .

I have my own ideas on matching compressors to turbines but as mentioned above I know stuff all about whats available in size and wheel design with IHI . The current have it all trend is twin scroll or divided turbine housing turbochargers and IHI are doing some in ball bearing form ie VF36 and VF38 . Provided the exhaust manifold can divide the exhaust pulses its a win win situation particularly with IHI's twin vent path/flat valve integral gate turbine housings ie the P25 .

Cheers A .

Interesting stuff Adrian,
Sounds like you know your **** when it comes to turbos. I for one would find a detailed write up on turbocharger technology and recent advancement an exciting read as my knowledge is only pretty skimpy. Perhaps you could do an extended breakdown in the Technical section???
Cheers

on closer inspection

they have Turbo Spec VF (cast) stamped numbers begin with a 2, the other a 5

next line is serial No. RHB5 (cast), 05114A (stamped)

next line part no. (cast) 14412AA002 (stamped)

the other part no. stamped is 14412AA003


maybe they are known as VF2 just as the MY's are known as MY's by sight?

Gee that could take a while and some very long posts . You could get some basics by going to the turbobygarrett.com site and having a read .

Very quicky the greatest leaps in turbocharger technology have been bearing systems and material specification . With better materials the components are much more durable (withstand heat and centrifugal forces better) so are true high speed devices , and pretty compact for the power they can make compared to the large heavy dinosaurs of the 70's and earlier .

If I go down this road just remember that Ive never been employed in this area and my knowledge is not endless .

If your after some reading go to the Ultimate Subaru Message Board USMB and have a look at what they're doing with Twin Scroll IHI Turbos on the EJ engines . If you wanted to get the most from the least (EA82T engine) something like these are what it would take . The EA82 engines being only one exhaust port per bank/head would need a twin up pipe and even then I'm not sure how the firing order goes or if it can take advantage of it . Its hard to argue that torque figures in ft/lbs approx the same as power in Hp is a bad thing .

Cheers A .

the rest of the world seem to identify these turbos as RHB5


http://www.smbaker.com/rail/ihirhb5.html

and also off his home is another turbo fit article which is gonna screw my LPG plans budget as I think I need to go draw thru set up

jono wrote: maybe they are known as VF2 just as the MY's are known as MY's by sight?

I'm certain mine has 'VF2' written on it. I dont think i can see it whilst installed but i'll check

timmo

Mine is VF4 but my motor is a 88 model (4plug ecu)
Maybe the 85-86 got the VF2 and EA81t got the VF1 non watercooled

Im pretty sure that the yanks have the VF7 in their EA82t motors

Do this search :

Turbomaster-Catalog-ihi RHB5 . More VF series than ya can poke a stick at .

Nite all .