How to read compressor maps

[Bako_Dmax]

Ok I see people talk about turbos and their compressor maps all the time, but have no clue how to read one.

How do you know when your "running off the turbos map" also the lbs/min what does that exactly mean and how does it equate to the amount of air needed to reach x amount of hp?

 

[JoshH]

Garrett has some really good tech info on their site: http://www.turbobygarrett.com/turbobygarrett/tech_center/tech_center.html

 

[maine dmax]

X2, Garrett's site explaines it really well