The beginnings of finding out what can and cannot be done with some "stuff" ...

A GT3071 will fit and can be clocked to a stock manifold, providing an adaptor is used


The turbo, (by measurement), will fit between the block and a Koyo rad, but you won't be able to use the stock fans, no way there will be enough room!


A 38mm Tial wastegate only just doesn't fit! The side of the wastegate fouls on the heatshield for the manifold, (no problem a small bend sorts that), but it just doesn't quite sit true to the flange due to just touching on the oil/water cooler.

This is very close and maybe removing a little material from the side of the wastegate would cure this...

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Kris
95 ST205 - slept for 10 years, now waking up...
Avensis
http://www.gtfours.co.uk
_______________________________________
Turbocharging - the replacement for displacement

Nice

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René - Carlos Sainz 2433•5000
Turbocelica.nl | ST185 CS restoration and full rebuild

If it ain't broken.. it soon will be

Kris, I'd have thought you really want the wastegate mounted in a more conventional position on the front of the adaptor? That way you won't have any clearance issues and it will be out in the cool(er) air. Also, isn't a 38mm wastegate a bit tichy for a GT3071?

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Don
GT4DC Chairman
1994 Toyota Celica GT-Four ST205WRC JDM 269bhp @ 0.9bar
1994 Toyota Celica GT-Four Special GT 590bhp @ 1.8bar
1989 Van Diemen RF88/89 Formula Ford 1600
2008 Nissan Patrol GU 3.0L ZD30DDTi 154bhp

Yes, but you have no option with the adaptor unless it is tweeked...


Don't think so. After all the internally gated GT2871 I believe has a smaller diameter wastegate

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Kris
95 ST205 - slept for 10 years, now waking up...
Avensis
http://www.gtfours.co.uk
_______________________________________
Turbocharging - the replacement for displacement

Nice turbo...might get one of those myself

Ive been advised a 44mm wastegate is more ideally suited to that turbo. Better at sustaining low boost would you believe in switchable applications (i asked as i was intending on having two levels of boost)

hth

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1995 ST205

Why not have the wastegate coming forward and the screamer going to the left then curving downward to atmosphere??

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1995 ST205

What sort of power are you aiming for Kris?

I had a very interesting convo with the bloke from Turbo Dynamics regarding turbos at TOTB. I asked about 350-400hp and fast response and he suggested a GT2871 or possibly custom made GT2869. With the 3071 I'd assume you're after mid to high 400's?

IIRC teh Stock Garrett turbo has a wastegate built in of 34mm.

Agree 3071 shoudl see 450 plus depending on which 3071 it is!

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JP
GT4DC Treasurer

Grey St185 RC
Silver BMW E46 M3
Multicolour yawn Honda VFR400
Silver Honda Civic Type-R

Am I correct in assuming it is the GT28 that has an internal wastegate of 34mm?

_________________
Don
GT4DC Chairman
1994 Toyota Celica GT-Four ST205WRC JDM 269bhp @ 0.9bar
1994 Toyota Celica GT-Four Special GT 590bhp @ 1.8bar
1989 Van Diemen RF88/89 Formula Ford 1600
2008 Nissan Patrol GU 3.0L ZD30DDTi 154bhp

Approx 400hp and tq, but I'll be happy to end up with whatever I get and enjoy the journey in trying to get there!

The 400 area seems like a bit of a no-mans land for turbos, with either a turbo maxing out or just starting to get into it's stride at this level, so rather than one just falling off maybe the 3071 would be a better choice?

Yep from my very poor turbo knowledge the GT2871 seems a great turbo for 350-400 but I wanted to not work the turbo and engine quite so hard in trying to get there, and maybe even have a little head room if things don't quite go according to plan

Haven't seen the 2871 without an internal wastegate yet? Think that an external gate is the way forward as it will allow better control of the turbo?

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Kris
95 ST205 - slept for 10 years, now waking up...
Avensis
http://www.gtfours.co.uk
_______________________________________
Turbocharging - the replacement for displacement

Talking to the TD lad (wish I could remember his name ), he said, aiming for 350-400 but with massive torque spread and basically aiming for response, the GT2871 would be good.

He mentioned maybe even a GT2869, custom built. Both are internally gated. With the GT2871 he'd recommend leaving the exhaust cam alone and fitting a slightly longer duration inlet cam.

Gt28 is indeed a 34mm internal gate. Interesting info Emicen

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JP
GT4DC Treasurer

Grey St185 RC
Silver BMW E46 M3
Multicolour yawn Honda VFR400
Silver Honda Civic Type-R

Excuse my ignorance with turbo's and my need to ask a novice question . . . .

Can someone elaborate on what means?

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Loosey
Loosey@gt4dc.co.uk
Storm Blue JDM ST205
Super White JDM ST205
http://www.gtfours.co.uk

Some people are like a Slinky .. Not really good for anything, but they make you smile when you shove them down the stairs!

Kris as i have said to you already,this turbo will be well sorted to what you want to achieve.the ex waste gate will ideal also for your power requirement.
Go for it kris you know it makes sence.
Hutch
xxxxx

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Please take your nails out of my dash..........501.1 Whp

Hutch, don't you know Kris has to go through the full loop before eventually deciding what he's doing

I've been badgering him for ages to go for this sort of spec but having said that he'll probably go off and buy some sort of chocolate turbo/WG/manifold (delete as appropriate )

_________________
Don
GT4DC Chairman
1994 Toyota Celica GT-Four ST205WRC JDM 269bhp @ 0.9bar
1994 Toyota Celica GT-Four Special GT 590bhp @ 1.8bar
1989 Van Diemen RF88/89 Formula Ford 1600
2008 Nissan Patrol GU 3.0L ZD30DDTi 154bhp