Much better.
The good thing now is the compressor is at high efficiency whenever you are on boost. This means less turbine power (so less EBP) is required to drive the compressor. The wastegate will open at around 20 - 22 lb/min. (What rpm that represents depends on turbine match.)

The other good thing is - at your highest operating point, you have 44 lb/min flow - 24 going through the turbine and 20 through the WG. Turbine PR should be less than double compressor PR under these conditions. You have plotted all your operating points at constant PR and the only way to achieve that is for the wastegate to be open (or "opening") at all of them. If you don't hit the PR early enough you will have to drop down in turbine housing size. If the top end is too choked down you will have to go up a housing size.

 

Normal assumption in the turbo world is if you pick the right turbo you should make 10 hp for every pound of
air mass. That means to make 350 crank HP you should only need 35 lbs per minute and with a 42 lb per minute mass flow you should make over 400 HP if you have not screwed up something else. Ideal HP would be 420 hp for 42 lbs /min mass flow.

Tom V.

 

What turbo is that? What are the wheel measurements? A t3 gt35 has a relatively small foot print. Still the best bang for your buck IMO... If you can fit it.

 

That was a GTX2976R. Its pretty much the biggest T25/5 bolt turbine I could find. Going to a T3 is not feasible in my case.

 

That way I'm looking at it, that's like a $1600 turbo. Id make room to run something more appropriately sized rather than pay that personally. I just can't see spending that kind of cash for such a baby turbo. A 58/54 is a better ratio for sure. But Not $1600 better IMO.

 

Crank HP might be different by 70 hp with a supercharged belt driven system.

If you are moving 42 lbs of air mass thru the engine you should have 420 HP if you haven't really screwed up something in your Turbo system.

Tom V.