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[HiProfile]

IIRC the large turbo should be 1.5-2x larger than the small. Any smaller or larger and you are aren't going to help a gasoline engine.

The hx40 is around 62 lb/min, and 16g's range from 33-37+ lb/min. I think it would be a good combo. Just make sure you use a large hx40 turbine housing if spool isn't your 1st concern. It needs to be sized/flow like the engine is putting out exhaust volume from an NA motor (4.4L instead of a 2.2L).

[robus]

Thanks, that's great info. I read a good thread on it on Dsmtuners and others, but hadn't found much clarity regarding turbines sizing.
I'm starting fabbing this weekend, while I wait for gaskets I need for the h22 build. The Holset has a 16cm turbine, not the biggest one out there but not the smallest either. So I'll run it as is now, I really look forward to the spool. I'm sure the top end won't be a concern.
Thanks again, and sorry for the threadjack guys.

[92CXyD]

Thanks, that's great info. I read a good thread on it on Dsmtuners and others, but hadn't found much clarity regarding turbines sizing.
I'm starting fabbing this weekend, while I wait for gaskets I need for the h22 build. The Holset has a 16cm turbine, not the biggest one out there but not the smallest either. So I'll run it as is now, I really look forward to the spool. I'm sure the top end won't be a concern.
Thanks again, and sorry for the threadjack guys.

I have my He351ve vgt to largest A/R with twincharge setup, it does make difference when sizing properly. 

[HiProfile]

What I've seen from sizing turbines: Size the small turbo's turbine for a "normal" street car with that motor size. Size the large turbo's turbine for max power with the compressor it's mated to.

When the 16g is spooled up to say 15psi, the 2.2L engine will be flowing more than a 4.0L's worth of exhaust volume through the big turbo. WHILE the 16g is spooling up, the big turbo will be adding some boost to it's inlet, so it will spool up even faster than a 16g alone.

Best way to understand this is to look at the diesel truck "sequential upgrade" kits and their dynos. They use the stock manifold and turbo, then add a huge turbo after that. It spools up faster than stock (the dyno shows power coming earlier) and has much more power everywhere.

[j.h.christ]

those fucking k03's are going to spool at like 1800 rpm

[rawr]

those fucking k03's are going to spool at like 1800 rpm

and with 2 they'll pull pretty decent and shit out at 6500.

Should feel god

[Phate]

those fucking k03's are going to spool at like 1800 rpm

and with 2 they'll pull pretty decent and shit out at 6500.

Should feel god

Yeah, I ran the numbers on an F22/23 and K03 setup a while back after I picked one up for stupidly cheap.  One turbo would get full boost at about 1000rpm, but fall on its face above 4500-5000 rpm.  For shits I just added a second one in the squirrel turbo calculator, and the maps actually looked really good.

[NoPistons!]

Your general lack of not giving a fuck is pretty beast.  Pimp setup.  Never have to worry about blowing out turbo gaskets again, no stupid clamps to worry about.  Less is more with twice the turbo.    Are you going to bridge your hot pipes too or just run 2 in, 1 out intercooler?