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Guest Message by DevFuse

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Webers ok, but turbo better?

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2 replies to this topic

#1 bbbs53


    Subaru Fanatic!

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  • 488 posts
  • Sequim, Washington

Posted 07 August 2003 - 11:26 AM

Hi, I am thinking about doing the turbo thing to the Ea-81. It is a fairly solid engine and I believe it will take it. I toyed with the idea of putting in an EA-82, but it is a pain in the behind. So I guess the question is, what would be needed and how hard is it to do. I realize that the turbo it self, spfi?, controls, exhaust change. I know that some brave soul has done this. I would imagine that it would be better to take the components off of an exsisting engine. Anyone got one? Thanks Bradd

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#2 ShawnW


    Subaru Master Technician

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  • Denver, Colorado

Posted 07 August 2003 - 12:00 PM

Bradd what are you doin over here already LOL! More ant less grasshopper. We are working as fast as we can! :)

#3 MilesFox


    Catch this Fox!

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Posted 15 August 2003 - 03:30 AM

if anyone knew how to contacy rguyver he put spfi on an ea81 and turboed it.

i had the idea in mind and i test fitted the parts, and here is what i came up with:
i used an ea82 turbo and cross pipe. the holes on the cross pipe are opposite of the studs on the ea81, but the threads are already tapped. either grind away the flange to fit around the existing studs and bolt it up, or take the studs out and relocate them to the other set of holes (i did the first)
the turbo bracket my need a little tweaking, i had to elongate the hole that bolted it down to the head. then o bolted on the turbo.
i was using an spfi intake, which i had to make a block-off plate for the egr: it had to be removed because it interfered with the turbo. i had ea82 pitch bar mountings, to fit in an already spfi ea82 sedan. leave the ea81 pitch bar mounting if you are going in an ea81 body. you will have to find the right combination of parts to fit the turbo to the throttle body, as the diameters are different. i was told that certain saab parts would fit, but nothing specific. I had the idea of running an oil line off one of the pump's taps, and have it dump off in a valve cover or oil fill tube. the water would be routed through the heater hoses. this was a test-fit for a proposed installation in Myoss Feece's 88 sedan spfi 2wd auto to 4wd 5spd conversion

the approach i would consider for turboing the trashwagon (it has an ea82, but an ea81 with turbo heads would be the same)
is to run a volkswagen cis injection, as is proven on OH NOAH's ride. use an ea81 block, your choice of pistons, weter it be an ea81, ea81t, or ea81 with turbo pistons from either ea81t or ea82t. use the heads from an ea81 t, as the injector bosses are cast into the head, whereas the ea82t's are in the manifold.
i was told to use the knock sensing distributor from an 85 or 86 turbo, but i would assume that 83 and a4 turbo dists would work the same

by going cis, you eliminate theneed for computer controls, although certain cis systems have an oxygen sensor. the cis is meccanically controlled, and produces 8psi of fuel, and some cis were on turbo applications. ea81 or ea2 turbo setups should fit. use the ea81t or ea82 spfi manifold

one more thing, the ea81t heads have the studs in the right location. my test fit used regular heads

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