T4 turbo on the stock manifold

[outrider]

Well it's been probably a year since my last (and probably first) post here. At the time I was swapping a 7M into my 260, and had put the front subframe from a MK3 Supra in to my car. Life happened, and my project has changed directions a few times now. When the 7M I had turned out to need more money in machine work than a complete 2jz, I canned the 7M idea, and put the stock Z suspension back in (refreshed at least). Then one day out picking parts I came across a turbo 280, and scored the complete engine and 5 speed for $400.

 

I've rebuilt the engine and finally getting started on the fun stuff.

 

I didn't find a lot of information on adapting to a T4 turbo frame, probably because there aren't a ton of good reasons for doing it. In my case, I already had a Precision turbo with a custom 59mm billet wheel, and a .58 T4 exhaust housing.

 

Getting the studs out were a treat. Two I was able to just double nut, the other two I broke off, so I welded nuts to them and was able to get them out. The T4 adapter was maybe $30 off ebay.

 

 

I'm using an external wastegate. I bored a hole under the flange for the turbo and welded a stainless elbow to the manifold. My welding skills aren't great, but I don't think it's going to leak.

 

My supra has a screamer pipe on it. I'm not a huge fan of the sound. So I decided to route the wastegate back to the downpipe. The downpipe is actually for a MK3 Supra, I just had to cut about 10 inches out of it and weld it back together.

 

Ignore my collection of horror freight pneumatic tools

 

Finally all back assembled.

 

And installed in the car.

 

There you have it. Seems to clear everything just fine. Now I'm off to hack up my intake manifold. Cheers!

[Chickenman]

Hmmmm... I just don't see how that the Turbo flange gasket is going to seal with those Allen head bolts recessed like that. The gasket is going to blow out on that thin little sealing edge left on the outside of the Allen head bolts. Good luck, but I don't think that will work very well???  

[Chickenman]

This is the way it should be done.

 

T3 to T4 adapter

Edited February 19, 2018 by Chickenman

[outrider]

I seen those but was worried about clearance. I hadn't thought about the gasket blowing out . If I ever get this thing running I'll update if/when the gasket fails. Fingers crossed it holds together I guess.

[Chickenman]

Kinda wondering why you didn't go with a T3/T4 Hybrid? T4 compressor with T3 exhaust housing. That's a pretty standard setup. T4 exhaust housing may be pretty laggy....

[outrider]

Well like I said, I had it laying around. It has a .58 A/R exhaust housing with a 62mm turbine, on my 2jz Supra it spooled near instantly. I've switched that out for a BW S362 for a little more headroom. Hence why it was collecting dust in my shop. I know the L28 isn't a 2jz, so I don't expect it to be quite as energetic as it was. Still hoping for good results though.

 

If it don't work, it's just 4 bolts and a v-band clamp. The harder part would be making everything line back up with a T3 turbo. I'd probably machine out a spacer and use longer studs.

[Turbo-six]

I have been planning to do something g similar with my car and a t4 turbo. Thanks for posting. 

[Brad-ManQ45]

I have a turbo manifold with T4 flange on it...