IHI VF36 twin-scroll turbo... it's gon' happen.

That spinning thing that makes all of the cool noises. OE and Aftermarket.

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free5ty1e
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Re: IHI VF36 twin-scroll turbo... it's gon' happen.

Post by free5ty1e »

sure thing... right now I get 300 - 350 km to the tank. This statistic will be updated after the upgrade :)

It's not happening right away but I am finally planning for it. I can't wait...sucks having to put it all on hold for years just after receiving this sweet VF36 turbo. On the plus side, my '94 is still ready for it!
-Chris
91SS 4EAT stock
91SS 5MT awaiting engine rebuild and VF36...
92SS 4EAT - RIP :(
94SS 5MT4.11+rLSD 289k km: RobTune550,TD05-16g @ 18psi,FMIC,3"TBE,Forester lift
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Re: IHI VF36 twin-scroll turbo... it's gon' happen.

Post by Legacy777 »

Just a quick note/question for you regarding the ball bearing turbo....I've heard that you want to use a restrictor pill or something on the oil supply line to the ball bearing turbos so they get properly lubrication. The ball bearing turbos are different since they don't run on a fluid film type bearing.

Like I said, I don't know all the specifics, but it may be something you should check into.
Josh

surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
2020 Outback Limted XT

If you need to get a hold of me please email me rather then pm
free5ty1e
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Re: IHI VF36 twin-scroll turbo... it's gon' happen.

Post by free5ty1e »

Legacy777 wrote:Just a quick note/question for you regarding the ball bearing turbo....I've heard that you want to use a restrictor pill or something on the oil supply line to the ball bearing turbos so they get properly lubrication. The ball bearing turbos are different since they don't run on a fluid film type bearing.

Like I said, I don't know all the specifics, but it may be something you should check into.
Ooh, that sounds important! Thanks for that Josh, I've put it on my list and will research further along those lines.
-Chris
91SS 4EAT stock
91SS 5MT awaiting engine rebuild and VF36...
92SS 4EAT - RIP :(
94SS 5MT4.11+rLSD 289k km: RobTune550,TD05-16g @ 18psi,FMIC,3"TBE,Forester lift
free5ty1e
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Re: IHI VF36 twin-scroll turbo... it's gon' happen.

Post by free5ty1e »

Yes, that was good to bring up!

This page has some good detail on the differences in oil requirements between ball / roller-bearing turbos (like the VF36) and standard journal / floating bearing turbos (like our stock VF11). In particular, this sums it up:
...ball bearings really only needs "drops" of oil where journal bearings require oil pressure to allow the bearing to float.
This makes sense now. Ball bearing CHRAs have oil seals that are not meant to hold pressure. They allow air pressure to blow through; too much oil pressure and the seals are useless. So, we need a restrictor (especially with Subaru oil pressures) to ensure that the ball-bearing CHRA never sees too much oil pressure.

In fact, Subaru made a special oil fitting banjo bolt with a smaller oil passage just for this purpose:
Subaru offer a banjo bolt with a smaller orifice to suit the roller-bearing VF series turbos. Sleeve/plain/divided thrust bearing VFs (nor any other plain bearing turbos AFAIK) do not require this.
Image
Looks like Subaru already engineered an appropriate oil restrictor for the VF-series ball-bearing turbos. I tend to trust their engineering. What do you guys think? Will I be fine as long as I utilize this banjo bolt to feed oil to my VF36?

EDIT for posterity in case pic host goes down -- this banjo bolt meant for usage with ball-bearing Subaru turbos has Subaru part # 15194 AA130 (text is better than photos for part #s)
Last edited by free5ty1e on Wed Jul 03, 2013 7:09 pm, edited 1 time in total.
-Chris
91SS 4EAT stock
91SS 5MT awaiting engine rebuild and VF36...
92SS 4EAT - RIP :(
94SS 5MT4.11+rLSD 289k km: RobTune550,TD05-16g @ 18psi,FMIC,3"TBE,Forester lift
Legacy777
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Re: IHI VF36 twin-scroll turbo... it's gon' happen.

Post by Legacy777 »

I think as long as you're using the appropriate banjo bolt/feed line for the ball bearing turbos you should be ok.

The ej22t engines tend to run a little higher oil pressure due to the oil squirters, so that would be my only caution. It should be fine, but again, just something to keep in mind.
Josh

surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
2020 Outback Limted XT

If you need to get a hold of me please email me rather then pm
free5ty1e
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Re: IHI VF36 twin-scroll turbo... it's gon' happen.

Post by free5ty1e »

<thread revival>
All parts for VF36 are now with me; most in storage, with the actual VF36 turbo in a box in my garage. This weekend I will be taking it out to examine after it's sat for so long, check for shaft play, rotational resistance, etc. I'll get photos and post 'em up here. I MEAN IT this time! :evil:

I am still looking for actual airflow and HP information on this turbo; a compressor map would be fantastic, as would some estimated statistics for usage with a 2.2 liter engine (i.e. where will it max out airflow and HP wise -- or will I hit other restrictions before the turbo is ever a bottleneck?)

Considering using this for my '91 SS after the engine is rebuilt with forged internals, or if the maximum power wouldn't necessitate forged internals then perhaps it will go on my '94 with the stock internals.

On NASIOC, I read about members running just shy of around 300HP with this turbo, but am unsure if this is where it peters out or if there is room for more supporting mods to allow for more power...? I also understand there are aftermarket upgrades for the VF36 for later, but at the moment I am interested what this stock Subaru turbo is capable of.

'91 SS Engine build thread
'91 SS Built EJ22T - Turbo selection thread

</thread revival>
-Chris
91SS 4EAT stock
91SS 5MT awaiting engine rebuild and VF36...
92SS 4EAT - RIP :(
94SS 5MT4.11+rLSD 289k km: RobTune550,TD05-16g @ 18psi,FMIC,3"TBE,Forester lift
mike-tracy
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Re: IHI VF36 twin-scroll turbo... it's gon' happen.

Post by mike-tracy »

This should be either td05 or vf39 size with far faster spool up. Don't know the condition of your internals, but stock 22t's can handle the other two turbos fine.
1992 Legacy SS 5mt, build in progress
Josh Colombo wrote: Mon Jan 14, 2002 10:23 am Wait....I'm confused now.
dscoobydoo
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Re: IHI VF36 twin-scroll turbo... it's gon' happen.

Post by dscoobydoo »

Sadly, 300 is about it. I have a VF-36 in my 05 STI and i am running about 320 WHP. Its not meant to be a high hp turbo, just a good all-around turbo.
Yes I have too many Subarus
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05 GD-STI
01- RS- Swapped-07 STI
00- GF
93 SS- "the original Robtune" (now in new hands)
free5ty1e
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Re: IHI VF36 twin-scroll turbo... it's gon' happen.

Post by free5ty1e »

Okay thats excellent to know. Probably going on the 94ss with stock internals and robtune550. Still would enjoy reviewing a compressor map.

Sent from my SAMSUNG-SGH-I337 using Tapatalk 4 Beta
-Chris
91SS 4EAT stock
91SS 5MT awaiting engine rebuild and VF36...
92SS 4EAT - RIP :(
94SS 5MT4.11+rLSD 289k km: RobTune550,TD05-16g @ 18psi,FMIC,3"TBE,Forester lift
beatersubi
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Re: IHI VF36 twin-scroll turbo... it's gon' happen.

Post by beatersubi »

Sounds like the perfect turbo for rallycross.
93 legacy wagon L, 22T swapped (TW imitator) now with five forward speeds. (Gone, but never forgotten)
johndrivesabox wrote: Rally, my kyboard is brok, his has nohing o do wih h liquor.
Originalcyn wrote:Apparently everyone hates Gabe.
free5ty1e
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Re: IHI VF36 twin-scroll turbo... it's gon' happen.

Post by free5ty1e »

...and I once again understand compressor maps and how to use them. Very handy video:
watch?v=0Lv4yjiuJSU

Still looking for a VF36 map, but at least I understand exactly how much better my T-bird warner-ISHI hybrid VC32(or VJ17)/VF11 is than the stock VF11. (found both those maps, one's in the posted 1992 FSM scan at the very end and the other is at this page, more specifically here is a direct link to the VC32(or VJ17) map image) :)
-Chris
91SS 4EAT stock
91SS 5MT awaiting engine rebuild and VF36...
92SS 4EAT - RIP :(
94SS 5MT4.11+rLSD 289k km: RobTune550,TD05-16g @ 18psi,FMIC,3"TBE,Forester lift
dscoobydoo
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Re: IHI VF36 twin-scroll turbo... it's gon' happen.

Post by dscoobydoo »

beatersubi wrote:Sounds like the perfect turbo for rallycross.
Pretty much the reason I went with it. I have more power at 2500 rpms than the Vf-39 did at max power on the stock tune.
Yes I have too many Subarus
No you can't have one
05 GD-STI
01- RS- Swapped-07 STI
00- GF
93 SS- "the original Robtune" (now in new hands)
free5ty1e
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Re: IHI VF36 twin-scroll turbo... it's gon' happen.

Post by free5ty1e »

So, here are some photos. The vf36 I have here is in excellent condition as far as I can tell!

Absolutely no shaft play in any axis. If I dont breathe reeeeal gentle-like, this thing begins to spool up lol

Seriously though, it spins so easily and smoothly. There's about zero resistance.

Compressor inlet:
Image

Twin scroll turbine inlet:
Image

Twin wastegate dump:
Image

Vf36 subaru part number: 14411AA492

Measurements I done took (tell me what I missed and how to accurately obtain the measurement and I will add to my list of info.
Inside Diameters in inches:
Compressor inlet 1 + (15/16)
Compressor outlet 1 + (9/16)
Turbine inlets (twinscroll) 2x 1 + (5/8)
Turbine outlet 2 + (1/4)

Sent from my SAMSUNG-SGH-I337 using Tapatalk 4 Beta
-Chris
91SS 4EAT stock
91SS 5MT awaiting engine rebuild and VF36...
92SS 4EAT - RIP :(
94SS 5MT4.11+rLSD 289k km: RobTune550,TD05-16g @ 18psi,FMIC,3"TBE,Forester lift
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