TurboTim

Poor Talon, I miss mine dearly, I had stroked 4G63 setup and a 20G at 24psi back in '07 by far the best and most fun car I've probably ever driven. Got a 11.27 out of it on 21psi.

Wish these Volvos were as easy to throw mods at (and as cheap).

Due to turbo size issues + manifold design: I think the power curve is going to be shaped like an "M" and be a nightmare for a tuner ...
I'm all for people doing new and unique things ... but don't you think this is unnecessary? A properly sized turbo or a variable vane would yield much better results. Or if you wanted to go really unique you could have ditched the turbos and found a used centrifugal supercharger.
I do like the custom intake manifold though. Due to the elongated velocity stacks inside I think you'll end up with useless volume but the larger volume in general will add a lot more forgiveness in my experience. If you wanted to reconsider ITB's I've used the ones off newer GXSR's (750's or 1000's) with great success. And you can buy a set of 4 for <$200.
Anyways, good luck with the build. Like everyone else I definitely want to see what the finished project ends up like :-)

I'd rethink that exhaust setup if I were you. That GT35 is never going to spool the way you have it set up, unless you plan on revving it out to 10k or something. When the wastegate starts to open at 15 psi only a small amount of exhaust is going to the big turbo- only exhaust from 3 cylinders that finds its way around that 90 bend and into and out of the wastegate at that.

The other problem is that having the cylinders going to different turbos means some cylinders will have higher backpressure (the ones going to the 15g or whatever), and the others will be breathing somewhat easier out the GT35. This effects the volumetric efficiency balance between cylinders, which means different ones will need different amounts of fuel and will have different optimal spark timing. When you go to tune the engine, whichever cylinder has the worst efficiency or highest backpressure/reversion will probably get the hottest piston crown temps and start knocking first, so you will have to tune for that one, leaving a bunch of power untapped in the other cylinders.

I know it sounds fun to do a "twin turbo" setup, but I would really advise against it. The problem with the GT3076 is that the turbine is much smaller than the compressor wheel, driving down the turbine efficiency and making it take longer to spool. If you get a properly matched Garrett or other turbo (the new GTX3071R should do the trick, or any EFR turbo), you will be much happier and your engine will appreciate it.

i was just about to ask about this i've heard different sized turbos get you both low and high rpm power so i'm sure benefit you. what made you not want to go with ITB's? maybe i missed your post about that but i know you can get 'em from bikes like hyabusa. just have to cut one off to make it fit!

anywho, this is a neat build. are you going to powdercoat anything while you're building or just leave it how it is?

Good things it has rods and pistons. I here engines don't have much umph without them.

Not to clutter you thread with my pics, they're here

With that header, aren't you going to limit the exhaust flow once the GT35R start pushing hard? Definitely going to be interesting!