Converting a t3 turbo into a hybrid t04

[The Humjet]

I picked an internally gated t3 turbo of an old saab for a very cheap price and I know they're a bit too small for the m20 and a turbo like a t04e is more suited to it. Could I bolt on a externaly gated larger turbine housing onto the back of the t3? Maybe something like this

http://www.ebay.com.au/itm/Turbine-Housing-Kinugawa-GT35R-GT3582R-GT3540-AR73-10cm-/280693151055?pt=AU_Car_Parts_Accessories&hash=item415a9d954f#ht_2163wt_1141

[LowR3V'in]

What car did it come off of.
Usually the m20 makes more power then those volvo/saab/vw turbos can make.

[The Humjet]

It's off a Saab 900, I found it at my my local pick a part. I took it because its the same type of turbo as what comes off one of our Australian cars which is the Holden VL commodore. They're powered by a Nissan RB30 and the guys here always convert the t3 turbos into a t3/t4 hybrid and make very good power with it. Infact my friend is pushing 340whp in his VL Commodore with a t3/t4 turbo.
I know bolting on a t4 turbine housing at the back of a t3 has been done what I'm after is some guidance for people here who have done it before maybe someone's had this experience with an old Volvo

[The Humjet]

Screw it I'm just gonna buy a t04e that'll do the job with a 12psi boosted m20 2.7

[einstein57]

I don't see why it would not work how it is for your goals of 12psi. From what I read they were making 7psi of boost with out an intercooler on a 3 liter motor. 5 more psi and an intercooler would not be to bad. But i'd try and find a compressor chart.

[The Humjet]

10-12psi is probably my initial boost, chances are i'll want to bump that more up more when I get bored of 250-280whp. Like they say boost is addictive. Also I want to run an external wastegate setup, a stock internal gated t3 isn't just gonna cut the mustard

[einstein57]

Sure it will. Also show you my super cheap custom mod tomorrow.

[The Humjet]

Look forward to seeing it

[einstein57]

Now they sell a garrett style flange that goes straight to v-band but that cost money. I have a stack of v-bands since I buy them by the box so this was a cheap alternative to keep me occupied. First thing is to cut off the arm that connects to the wastegate diaphram. Then drill in a slight recess on the shaft portion that is still in the housing. Push the flapper closed and weld the recessed area this will allow you to change the flange if you change your mind in the future. Then wire brush the original DP area and weld on a 2.5" v-band. If you read the decriptions some of them are mild steel. This would be prefered to stainless since it has a lower thermal expansion rate. Grind smoth and enjoy external waste gated, v-banded turbo for under $20.

[einstein57]

This is where the flapper shaft was


The inside before I did the final pass and grinding.

[The Humjet]

Thanks heaps for that einstein, I'll definatly look into that. Might take up a welding class so I can do this handy work you do in future.