On a stock T2 blower boosting around 22psi at 5k I think I calculated the air being sucked into the blower inlet was approx 150mph. Imagine holding a sieve out the window of a car doing 150mph, you wouldnt hold onto it it would just catch the air and whip it out your hand, the same is happening on the entry of the turbo. Now imagine that with a td04 which is supposed to flow alot more... may seem like there's little restriction when you blow through it, but imagine intensifying that air then any small restrictions become huge.
I know ruan was banging on about this for ages and it took me a while to get my head around it, but you want to aim for zero pressure acting on any surface, so the goal would strangely be to reach 0 psi boost, which would achieve maximum flow (Turbos wouldnt like that though). The less boost, the more air is being taken into the engine. The less vacuum you have on the inlet of the turbo, the more flow you will allow it, same goes for the exhaust etc which is common practice.
I know ruan was banging on about this for ages and it took me a while to get my head around it, but you want to aim for zero pressure acting on any surface, so the goal would strangely be to reach 0 psi boost, which would achieve maximum flow (Turbos wouldnt like that though). The less boost, the more air is being taken into the engine. The less vacuum you have on the inlet of the turbo, the more flow you will allow it, same goes for the exhaust etc which is common practice.
![[Image: 22f2b6b2-758b-4c1c-96fb-6fa9c6059b13_zpsf306b56b.jpg]](http://i585.photobucket.com/albums/ss299/Ha11elujaz0rs/22f2b6b2-758b-4c1c-96fb-6fa9c6059b13_zpsf306b56b.jpg)