You have to take into account vaccum on the turbo inlet side as well so pressure ratio at that boost is about 1.7.turbo2nr said:Is the turbo you are using also called a "Disco Potatoe":nanner2: ?
Last question. Is a pressure ratio of 1.5 about the same as 7.5PSI?
Also consider this: Airflow is just one piece of the puzzle. The engines VE makes a HUGE difference in what kind of power actually comes out of that airflow.
An engine with a VE of 98% will make LARGE gains over an engine at 80% VE.
A good example of this is the SRT4 and Cosworth Focus SVT. The SRT4 with 8.1:1 compression and "so so" breathing head makes about 220whp with 17psi of boost.
When turbocharging the 2.0 Focus engine with only 8psi, they made over 245whp. (Using the same GT28RS mind you).
The more efficient engine does more with less. VTEC Honda's with boost are a very good example of this. How many 400whp B18's are out there running only 15psi of boost. We also made 480hp with a built Mitsu 4G63 running only 16psi of boost on a GT35R turbo - THAT car was a monster when all was said and done. Nothing like 4wd drifts from a roll in third gear. :bow:
Technically, the 28RS compressor can flow about 33lbs of air at 1.7 ratio - but it's out of it's range to do that big time.