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2002 Subaru b4 twin turbo upgrades


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#1 Dylan720

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Posted 06 April 2018 - 11:38 PM

Hi all just wondering if you could upgrade both stock turbos on a 2002 b4 i was thinking of making my smaller turbo a vf34 and my bigger turbo a vf38 or vf40. Just wondering if it can be done and is it just a straight swap bolt on job. Thanks

#2 duncanm

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Posted 06 April 2018 - 11:51 PM

yes, yes, no.

 

But more importantly  - why?

 

You won't spool two big turbos with a 2l engine until some stupid rpm.

 

 

Hate to say this - being a happy TT owner - but go single if you want more power.



#3 Dylan720

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Posted 07 April 2018 - 12:08 AM

Oh ok is it a very expensive job getting converted to a single turbo setup is there alot involved to do it

#4 duncanm

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Posted 07 April 2018 - 08:40 AM

step 1: search.

step 2: read what you find

step 3: ask questions.

 

please don't skip steps 1 and 2

 

Its pretty straightforward - especially compared to what you were proposing.



#5 Dylan720

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Posted 07 April 2018 - 03:06 PM

Ive done some research on it couldent really find much thats why i asked on here

#6 Barbbachello

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Posted 07 April 2018 - 06:44 PM

The twin turbos have very different flanges to the single turbos. No they won't swap over without custom up and dump pipes. Nor will they ever run well in a twin Environment.

Single turbo is the way forward if you want power

tIeW8DE.png


#7 duncanm

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Posted 07 April 2018 - 09:27 PM

http://www.clubsub.o...sion-thread-20/



#8 Jimbo

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Posted 08 April 2018 - 09:15 AM

The turbos on the B4 are the best ones available anyway.

'04 Liberty GT Premium "The Sprog Chariot"


#9 duncanm

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Posted 08 April 2018 - 12:23 PM

cheapest / easiest way to power on the twins would be exhaust + E85 + open source tune.

 

ala Josh (eculabs): http://www.subyclub....k-gtb/?p=538170

 

or delta labs: https://lambdatuning...bebh-base-maps/



#10 Dylan720

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Posted 08 April 2018 - 08:05 PM

Ok how much power gain cn i expect to achieve running e85 open sauce tune plus exhaust ?

#11 duncanm

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Posted 08 April 2018 - 10:29 PM

http://www.subyclub....k-gtb/?p=538170

 

but I repeat myself.



#12 Dylan720

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Posted 08 April 2018 - 10:39 PM

Ok thanks mate ill look into getting that done

#13 Arfreedom

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Posted 21 September 2018 - 09:03 PM

Make sure your downpipe is the MRT version with the open mouth piece from the turbo (downpipes). I'll look for the link and send you later. That alone with tune should give you 50hp.
Then add your e-85. I don't have that here in my country but for sure will give you a lil bit more power.
However there is another little secret that will give you the ability to turn up even more boost about 30hp or so is the Water Meth after tune. Unless you have a point to make on the track, I don't see why you wouldn't be happy with those mods on the road. 360hp+



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#14 Arfreedom

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Posted 03 October 2018 - 11:10 AM

as promise, here is the link to the exhaust pipping

https://www.rhdjapan...e5-bh5-bh9.html






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