gtlegacy

Turbos on Twin Turbo Subaru Legacy/s

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OP is below here is a Comprehensive list Of Subaru Legacy Twin Turbo's by @telemekas

 

 

11 hours ago, telemekas said:

VF13/14 BG5A GT  BG5A Legacy Auto and manual EJ20H (MY93-MY95)
VF16/17
VF18/19 BG5B GTB M/T  BG5B Legacy GTB manual EJ20R (MY96)
VF20/21 BG5B GTB A/T  BG5 Legacy GTB Auto EJ20H S2

VF25/27 BE5/BH5 Rev A-C A/T  BH5A/B Legacy GT/GTB auto EJ206
VF26/27 BE5/BH5 Rev A-C M/T  BH5A/B GT/GTB Auto and manual EJ206/8


VF31/32 GTB  ETune wagon
VF33/32 BE5 Rev D       BH5/BE5C/D legacy GTB/RSK EJ206/8

Turbo     OEM     Fitted To     Compressor Housing                      Exhaust Housing     CFM Rating     Bearing Type     Notes

VF13     IHI     BG5A Legacy Auto and manual EJ20H (MY93-MY95)        P16                                             BB          Primary Turbo
VF14     IHI     BG5A Legacy Auto and manual EJ20H (MY93-MY95)        P16                                             BB          Secondary Turbo
VF16     IHI                                                                                                   P16                                             BB          Primary Turbo
VF17     IHI                                                                                                   P18                                             BB          Secondary
VF18     IHI     BG5B Legacy GTB manual EJ20R (MY96)                          P16                                             BB          Primary Turbo
VF19     IHI     BG5B Legacy GTB manual EJ20R (MY96)                          P18                                             BB          Secondary Turbo
VF20     IHI     BG5 Legacy GTB Auto EJ20H S2                                        P16                                             BB          Primary
VF21     IHI                                                                                                   P18                                             BB          Secondary 
VF25     IHI     BH5A/B Legacy GT/GTB auto EJ206                                   P12                                             SL          Primary Turbo
VF26     IHI                                                                                                   P14                                             SL          Primary  
VF27     IHI     BH5A/B GT/GTB Auto and manual EJ206/8                        P18                                             BB          Secondary Turbo
VF31     IHI                                                                                                   P11                                             BB          Primary
VF32     IHI     BH5/BE5C/D legacy GTB/RSK EJ206/8                               P18                                            BB          Secondary Turbo
VF33     IHI     BH5D/BE5D legacy GTB/RSK EJ206/8                                P11                                             SL          Primary Turbo
              

 

Joker was here!

 

at the moment i have standard vf20 primary and vf19 secondary which is a bit stif so may be on the way out

would a good upgrade be vf33 and vf32?

what are the differences between them? there isnt much info around for the Twin turbos i know that the vf26-27 are the best for top end just wondering how the vf33 and 32 compare

cheers

Edited by Joker
Updated OP with the important info found later in this thread
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Yea I found some cheap and as a result I am 50kw less

'upgrade' to VF31 Primary and VF27 Secondry, from VF 18/19 BG OEM combo (previously 185 Kw on Chequered Flag Hub Dyno)

mix/matched pair 'may' be a factor, so could the second hand nature of the items... OR it could be something else completely (car approaching 190,000 km's)

all in all less kW may mean it lives longer and remains slightly more reliable?

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 gtlegacy said:

at the moment i have standard vf20 primary and vf19 secondary

No, it's VF18 primary, and 19 secondary :). They are good turbo's for the TT's, the only worthy update that doesn't involve single turbo's is the VF26/VF27 combo.

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im sorry but thats not how i read it and also i pulled them off the engine myself for the rebuild and read the ihi turbo info page my97 has vf20

engine is ej20R manual 1997 rsb

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I also found the BG5's came with VF16/17's too

But yeah, AFAIK stock turbo's for the manual RSB/GTB's are the 18/19 combo. But if you say it has VF20 printed on it... well, i won't dispute that!

Where have these odd turbo's been hiding <_<

FYI, my 98 GTB Limited (Model year 97, so same as yours) had the VF18 and 19 combo. Manual and EJ20R too.

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what do people think of vf32 and 33 seem to be be alot bigger in the exhaust housing ? compared to vf 26-27 from what i have read

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ok i found this info but im a bit confused what does all this mean?

VF22 BB, PZ20 ex.h/48.5mm c.h/5b c.w/0.71 A/R - JDM MY97 V3 STi/1998/ optional 22B

VF23 BB, PZ20 ex.h/46.7mm c.h/6b c.w/0.71 A/R - JDM MY97 V3 STi/1998/ 22B

VF24 BB, PZ18 ex.h/46.7mm c.h/6b c.w/0.63 A/R - JDM MY98 V4 STi

VF25 TB, PZ12 ex.h/38.2mm c.h/10b c.w/0.36 A/R - JDM MY00 Legacy B4 Primary turbo

VF26 TB, PZ14 ex.h/38.2mm c.h/0.48 A/R - JDM Legacy B4 Primary turbo

VF27 BB, PZ18 ex.h/38.2mm c.h/10b c.w./0.63 A/R - JDM Legacy Secondary turbo

VF28 BB, PZ18 ex.h/46.7mm c.h/7b c.w/0.63 A/R - JDM/OZ MY99/00 V5/V6 STi

VF29 BB, PZ18 ex.h/46.7mm c.h/7b c.w/0.63 A/R - JDM WRX MY99-00 V5/V6 STi

VF30 TB, PZ18 ex.h/47.9mm c.h/6+6b c.w/0.63 A/R - JDM MY01 V7 STi

VF31 ??, PZ11 ex.h/??????

VF32 TB, PZ?? ex.h/46.5mm c.h/10b c.w/0.70 A/R - JDM/OZ Legacy/B4 Secondary turbo

VF33 TB, PZ11 ex.h/46.5mm c.h/6+6b c.w/0.75 A/R - JDM/OZ Legacy/B4 Primary turbo

VF34 BB, PZ18 ex.h/47.9mm c.h/6+6b c.w/0.63 A/R - JDM V7/V8 STi RA Spec C

VF35 TB, PZ15 ex.h/47.9mm c.h/9b c.w/0.51 A/R - OZ/UK MY02-05 STi

VF36 BB, twin-scroll titanium wheel/shaft - PZ25 ex.h/47.9mm c.h/9b c.w/0.63 A/R - JDM MY03-06 STi RA Spec C

VF37 TB, twin-scroll - PZ25 ex.h/47.9mm c.h/9b c.w/0.63 A/R - JDM MY03-06 STi

VF38 BB, twin-scroll titanium wheel/shaft - PZ?? - JDM/OZ MY05 Legacy/Liberty GT

VF39 TB, PZ18 ex.h/47.9mm c.h/9b c.w/0.63 A/R - US MY04-06 2.5L STi

VF40 TB, PZ17 ex.h - US MY05-07 Legacy GT/JDM Forester STi

VF41 ??, PZ18 ex.h - JDM Forester STi

VF42 BB, twin-scroll titanium wheel/shaft - PZ25 - JDM STi S203/204

VF43 TB, PZ18 ex.h/47.9mm c.h/9b c.w/0.63 A/R - OZ/US MY06-07 STi

VF48 TB, PZ?? - OZ/US MY08+ STi

VF52 TB, PZ?? - OZ/US MY09+ WRX

BB = Ball bearing

TB = Thrust bearing/Plain Sleeve bearing

ex.h = Exhaust housing

c.h = Compressor housing

(x)b = (x) bladed compressor wheel

c.w = Compressor wheel

A/R = Area to Radius turbine housing ratio

JDM = Japanese Domestic Model

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 gtlegacy said:

ok i found this info but im a bit confused what does all this mean?

VF22 BB, PZ20 ex.h/48.5mm c.h/5b c.w/0.71 A/R - JDM MY97 V3 STi/1998/ optional 22B

VF23 BB, PZ20 ex.h/46.7mm c.h/6b c.w/0.71 A/R - JDM MY97 V3 STi/1998/ 22B

VF24 BB, PZ18 ex.h/46.7mm c.h/6b c.w/0.63 A/R - JDM MY98 V4 STi

VF25 TB, PZ12 ex.h/38.2mm c.h/10b c.w/0.36 A/R - JDM MY00 Legacy B4 Primary turboVF26 TB, PZ14 ex.h/38.2mm c.h/0.48 A/R - JDM Legacy B4 Primary turboVF27 BB, PZ18 ex.h/38.2mm c.h/10b c.w./0.63 A/R - JDM Legacy Secondary turbo

VF28 BB, PZ18 ex.h/46.7mm c.h/7b c.w/0.63 A/R - JDM/OZ MY99/00 V5/V6 STi

VF29 BB, PZ18 ex.h/46.7mm c.h/7b c.w/0.63 A/R - JDM WRX MY99-00 V5/V6 STi

VF30 TB, PZ18 ex.h/47.9mm c.h/6+6b c.w/0.63 A/R - JDM MY01 V7 STi

VF31 ??, PZ11 ex.h/? ??? ??VF32 TB, PZ?? ex.h/46.5mm c.h/10b c.w/0.70 A/R - JDM/OZ Legacy/B4 Secondary turboVF33 TB, PZ11 ex.h/46.5mm c.h/6+6b c.w/0.75 A/R - JDM/OZ Legacy/B4 Primary turbo

VF34 BB, PZ18 ex.h/47.9mm c.h/6+6b c.w/0.63 A/R - JDM V7/V8 STi RA Spec C

VF35 TB, PZ15 ex.h/47.9mm c.h/9b c.w/0.51 A/R - OZ/UK MY02-05 STi

VF36 BB, twin-scroll titanium wheel/shaft - PZ25 ex.h/47.9mm c.h/9b c.w/0.63 A/R - JDM MY03-06 STi RA Spec C

VF37 TB, twin-scroll - PZ25 ex.h/47.9mm c.h/9b c.w/0.63 A/R - JDM MY03-06 STi

VF38 BB, twin-scroll titanium wheel/shaft - PZ?? - JDM/OZ MY05 Legacy/Liberty GT

VF39 TB, PZ18 ex.h/47.9mm c.h/9b c.w/0.63 A/R - US MY04-06 2.5L STi

VF40 TB, PZ17 ex.h - US MY05-07 Legacy GT/JDM Forester STi

VF41 ??, PZ18 ex.h - JDM Forester STi

VF42 BB, twin-scroll titanium wheel/shaft - PZ25 - JDM STi S203/204

VF43 TB, PZ18 ex.h/47.9mm c.h/9b c.w/0.63 A/R - OZ/US MY06-07 STi

VF48 TB, PZ?? - OZ/US MY08+ STi

VF52 TB, PZ?? - OZ/US MY09+ WRX

BB = Ball bearing

TB = Thrust bearing/Plain Sleeve bearing

ex.h = Exhaust housing

c.h = Compressor housing

(x)b = (x) bladed compressor wheel

c.w = Compressor wheel

A/R = Area to Radius turbine housing ratio

JDM = Japanese Domestic Model

[/]

[]

only worry about these - notice it skips the 18/19/13/14's[/]

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i might just keep my stockers seems like to much trouble when there really isnt that much difference i guess i could allways get them modded later on

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just thinking there are alot of cheap td04 turbos on trademe how hard would it be to make a td04 fit in the secondary turbo position of a twin turbo? i can do all the fab work etc

is it as simple as modify the up pipe so the control valve sits lower to make the adaptor plate i need to fit the td04 and use the oil and water lines and make it work but the thing that gets me is what about the plastic intake?

would it work if i say cut the plastic and used a silicon joiner there on top of the plastic to the turbo intake as its only an air intake it doesnt have pressure and should seal up properly? only thing im worried about is a load of vod trying to spool that puupy up at 4k

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Guest boostin

It wouldn't be too hard, but you need 2 similar sized turbos, otherwise the TD04 will just blow back through the primary.

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VF25

Primary turbocharger used on the JDM Legacy B4. Utilizes a thrust-bearing design and a P12 exhaust housing.

VF26

This is the standard equipment primary turbocharger used on the JDM Legacy B4. Utilizes a divided thrust-bearing design and a P14 exhaust housing.

Anyone care to explain the difference in these two both are for BH B4/GTBs but Im not sure which one to get.

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from what i have read the vf26 is regarded as a larger turbo not to sure if this is true but a lot of subaru shops recommend them

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 JoKer said:

Yea I found some cheap and as a result I am 50kw less

'upgrade' to VF31 Primary and VF27 Secondry, from VF 18/19 BG OEM combo (previously 185 Kw on Chequered Flag Hub Dyno)

mix/matched pair 'may' be a factor, so could the second hand nature of the items... OR it could be something else completely (car approaching 190,000 km's)

all in all less kW may mean it lives longer and remains slightly more reliable?

does the car feel alot slower than before with the other turbos?

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whistley secondary, and down to 130 kw - but not noticeably slower.... but still not right

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when you say whistely do you mean you can hear it all the time? and its sounds kinda like its spooling but just whistles away? but i cant hear it at idle? mainly just when i take off from cold and not boosting

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nah whsitley on boost only - so dont hear it much

I think Reuben had slightly damaged turbo fins that made a noise too - might be the problem

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i just pulled it out the other day and they were fine but have only just started mking the noise a couple of days ago

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hmm vf31 upgrade ? is it an upgrade or just better to upgrade to it rather than a vf 18 or 20 because newer and sppols up quicker? would be keen after track day and xmas goddamn it

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well it doesn't leak oil and it bolts on...

it was also cheep and keep me moving! - until I see power increase I will never really call it an upgrade..

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