Originally Posted by Infinite
Yes I have. Twin turbo setups don't need huge turbos t make streetable power
Each cylinder bank is roughly 1.6 liters. With two t28s I could easily make 500whp. Hell my sr20det made 300whp @ 14psi with one t28.
The ct12a's are roughly the same physical size as a t25. And each flows 25lb/min efficiently around 10-12psi so assuming the motor has 100% volumetric efficiency (which it doesn't. In theory) I should make 500 crank horsepower. But there are limits with pump gas as well as the strength of the internals.
It's not psi that matters but airflow. As there's only so much air you can shove into that clyinder before thngs start to break
Not in attempt to dissuade you from what you are doing, but I find it hard to believe that a single CT12A can flow 25 lb/min efficiently. In fact, I'm not sure where your numbers come from. In fact, they sound wrong. The CT12A should be rated at 100kW each . Two CT12A's are 200kW, which comes out to 272 hp. This is in agreement with the factory rating of the 1JZ-GTE that came on the old Supra/Soarers.
There is a huge difference in the compressor between a T25 and T28 turbo. The CT12A turbo is about the same as a T25, but it is not going to give you 25 lb/min! More accurately, the CT12A will give you a maximum of 100kW per turbo.
I would suggest dual T28's with 60 trim compressors. But even then you are going to have some serious space issues, especially if you have built-in wastegates.
Also, psi does matter, as well as airflow. The airflow the turbo can provide is not necessarily what the engine can use. A hypothetical turbo pumping out 100000cfm at 15psi stuck to a 3.2L M112 Mercedes Engine will not be able to use 1000000cfm. No. In fact, the turbo would actually experience something called 'surge'.
Basically, to make 500 crank horsepower, you're going to need a turbo that can run at a pressure of 21 psi, as well as flow around 550 lb/min of air. The engine determines the required flow rate required, not the turbo. CT12A - no way. T25 - no way. T28 - 60 trim could work.