turbo's and PSI question?
Hello,
I'm new into Tuning and when ever I ask question about something new people won't stop laugh on me... anyways, I want to understand more about PSI, My friend has a VW with turbo on and when he says "ripped the valve from the tubing... now im running minimum boost (5 psi which is bs. no pull)" what this running minimum 5 psi means? and what this PSI does? 
I would like to understand ounce and for all so I could at least talk to people wants to talk about Turbos and supercharger but when they do I'm simply saying " aham, yeah , yeah, ok ... " I don't want to be annoying and I want to listen and understand really what they talk about.
Lil help please?
I have a 1999 Vw Passat with a 1.8t. It came with a small stock turbo pushing about 7 psi(pounds per square inch). A normally aspirated motor can only suck in as much air as its displacement(size of the engine) and its efficiency. With things like multi-valve heads variable valve timing, better intakes, exhaust and many other engine improvements engines have become more efficient and produce more power and get better fuel economy. The more air an engine can take in the more power it can make with the right fuel ratio.
Think of the engine as a human runner. He inhales and exhales air as he runs. Intake and exhaust (get it). Put a filter over his nose and a muffler on his mouth and he wouldn't be able to run as fast because of the restrictions. Remove restrictions or improve them he with make be faster.
A turbo has two turbines. One is spun by exhaust gases and the other one sucks in air and pushes it into the motor. The turbines are connected of coarse. In a supercharger the turbine is spun by an accessory belt similar to what spins your alternator or water pump. It sucks in air and pushes it into the engine. The more air they push (psi) into the engine and if you add the extra fuel the more power you'll make from any given motor. Motor design and build quality will dictate how much extra power a stock motor can make without failure.
I put a bigger turbo, front mounted intercooler, bigger fuel pump and injectors, full exhuast, and intake plus a chip or "tune". Also i added an electronic boost controller so can adjust my PSI from 0-23 psi. 23 psi is about as much as my stock motor can handle.
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