turbo upgrade ea82t

Subafury · Post by **Subafury** » Mon Dec 10, 2007 9:48 am

hey i seem to remember there being a thread with info about all the different subaru turbochargers. can anyone help me out with a link? search wasnt my friend.
also im just looking at some options here. what non std turbo's have others put onto their EA82T's?
EDIT: im looking for a fairly small one for 4x4 usage ie less lag the better.
btw is there any standard turbo's kicking around near perth? i think mine is gone

Gannon · Post by **Gannon** » Mon Dec 10, 2007 4:01 pm

Im planning on putting on a TF035 (GT Forester) on mine soon.
I know that many have put on a TD04 in the USA

discopotato03 · Post by **discopotato03** » Mon Dec 10, 2007 4:12 pm

I can't quote the numbers but I hear that the ball bearing Forrester GT one is not hard to fit but needs the longer mounting flange on the up pipe . Depending on which inlet manifold you use the inlet side of the compressor housing may need alterations .

Cheers A .

Xtreme_RX · Post by **Xtreme_RX** » Mon Dec 10, 2007 4:53 pm

Suparoo wrote:Im planning on putting on a TF035 (GT Forester) on mine soon.

Its not an easy install........................

Subafury · Post by **Subafury** » Mon Dec 10, 2007 5:18 pm

ive done some thinking and research over the last couple hours and ive decided i might as well go for a td04 as it seems it'll cost about the same to setup and is readily avail and its an upgrade. thats if a used vf4 doesnt present itself.

so does anyone know exactly what mods will make it fit. obviously the up n down pipe flanges will need some changin. and i heard that just the coolant line needs extending. does anyone know more?

mattims · Post by **mattims** » Mon Dec 10, 2007 11:37 pm

you could try out the primary from a twin setup.. it wouldnt have much lag .. no idea if it would fit. I've got a spare though.

Gannon · Post by **Gannon** » Tue Dec 11, 2007 5:30 am

Xtreme_RX wrote:Its not an easy install........................

How so?

Im in the proess of upgrading the up-pipe, i have the 2 flanges needed.
I just need to mount it on a slight angle to clear the throttle cable.

Its the same housing as the TD04, just a bit smaller so it will make boost earlier. It looks much more effeciant than a VF4/RHB5

discopotato03 · Post by **discopotato03** » Tue Dec 11, 2007 7:54 am

Guys I can give all sorts of info on Garretts GT BB turbos but not about IHI/Mitsi or whoever does turbos for Subaru .
What I can tell you is the Subi types are easier than Garretts because they tend to be more compact and they have both water fittings on the same side of the turbos cartridge .

One thing that is a characteristic of all EA and many EJ turbos is the small size of the wheels and turbine housings , this has everything to do with Subarus header designs making for high exhaust manifold pressure to suit emissions . It does zip for wide ranging performance until you get into the twin scroll EJ headers and turbos .

That aside there's virtually always advantages to running ball bearing turbos - mainly because hardened steel balls in hardened steel races have very little point contact area and much less friction/oil sheer drag than bush bearing turbos . The upshot of this is that they require less innitial exhaust gas energy to spool them up so they can be slightly larger wheel and housing wise without the turbine lag penalty .
The other side of modern era turbos is the later aero tech compressors and turbine wheels , they are lighter (less innertia to overecome) and impart less heat into the air they churn than the old dinosaurs .
Lastly modern turbos usually use more heat resistant materials in the turbines and exhaust housings and don't tend to crack as easily as older designs .
The turbo I pulled off that 2WD Vortex at Pick and Payless had major cracks in its exhaust housing so I think there's limited value in pushing std EA type turbos . The exhaust housing A/R (area to radius) ratio is really too small anyway and would have been designed to cope with the pathetic EA82T header .

In basic terms you need to treat the whole header/turbo/cat/exhaust system as a single entity and spec them to work with one another . For example you could make/fit a better header but then the hot side of the turbo become a choke point so you improve that as well . Now the cat can't pass easily the extra exhaust flow so you change it and the exhaust pipe and mufflers don't cope and etc .

Anyhow I think the Forrester BB turbo would be a reasonable try because its been designed to help develop the power level that a reasonably well sorted EA82T could live with if its design problems were delt with . Also the later turbo would have later tech wheels (and more temp resistant turbines/exhaust housings) than the EA-T or 1st Gen Liberty RS type turbos .

Cheers A .

Xtreme_RX · Post by **Xtreme_RX** » Tue Dec 11, 2007 8:32 am

Suparoo wrote:How so?

Im in the proess of upgrading the up-pipe, i have the 2 flanges needed.
I just need to mount it on a slight angle to clear the throttle cable.

The turbo needs to be rotated allot to clear the steering arm. Been there done that....

Send me a PM & I will explain more.

Subafury · Post by **Subafury** » Tue Dec 11, 2007 10:06 am

mattims wrote:you could try out the primary from a twin setup.. it wouldnt have much lag .. no idea if it would fit. I've got a spare though.

sounds like a good idea also. i wouldnt mind grabbin it off ya just for a test fit. the primary its a vf33 right? i plan on having a cheap td04 in my hands by thurs night. then maybe i can test fit both and see what one will be easier to install.