Quote:
Originally Posted by bobc455
Again, not so easy - since many turbos spin at 30,000 to 60,000 RPM (and I've heard of some at 100k+ RPM)
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If you look at the flow chart I posted above, the (mostly) horizontal curves with the big numbers next to them are RPM values. The map
starts at 56,400 RPM. A super-60 T3 (60 referring to the .60 A/R value) is a middle of the road to slightly large turbo for automotive applications. Larger turbos may spin slower, smaller ones may spin faster.
The ovals are regions of efficiency if I recall correctly. The closer to the middle oval, the more efficient the compressor will be operating.
Pressure ratio refers to how much boost the compressor is producing. 1.00 = atmospheric pressure x 1 = no boost. 2.00 = atmospheric pressure x 2 = ~14.7 psi. The chart maxes out at about 2.8, or 26 psi of boost.
Air flow in lbs/min along the bottom will depend on your engine's displacement and volumetric efficiency (how efficient it is at moving air) as well as how much boost you're running.
ZHangYang 
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