Turbo questions Options

[scorp28]

I am trying to get a little better understanding of turbos. I understand the concept of how they operate and all but I was curious about this.

Alot of people go with the saying bigger is better, but is that always true. For this discussion I will just use generic terms to avoid the differences in manufacturers.

We have turbo A (small turbo) and turbo B (big turbo). For the sake of keeping all things equal lets say that both turbos are efficient to at least 15psi, and in this scenerio we are only going to be running at 15.

Not here is where I am trying to fully understand. Is 15 psi the same 15psi for both of them in which case the smaller turbo would be better because it would spool faster therefore reaping is benefits sooner, or since generally speaking a larger turbo is capable of running higher boost pressures more efficiently the air charge would be cooler than the smaller turbo (since it would be nearing it's peak efficiency and therefore be heating the air more) and therefore more dense in effect pushing more air at that same level of 15psi.

I hope you know what I am attempting to say.

I never claimed to be a physics genius or anything but just close to genius on an IQ level

[turbohcar]

Not exactly the right way to think about it. Back to the house fan analogy. Lets say both fans have a high and a low setting. The low setting is the same voltage for both fans as well as the high setting being the same for both fans. Low RPM and High RPM. The pocket fan takes little effort to go from Low to High and on High, it pushes 100cfm. The house fan takes about twice as long to go from Low to High speed but on high it pushes 600cfm.

Anybody that has lived through the summer without A/C can tell you, the bigger the fan the better. A small fan at 110volts vs. a big fan at 110volts, which one would you choose? The bigger fan takes longer to get up to speed but when it's there you feel like you're driving an open cockpit jetplane. The small fan gets up to speed faster but you only feel like you're driving your brother's big-wheel down the sidewalk.

Small fan=small turbo, big fan=big turbo, 110volts=energy reqired to spin the turbine blades (or exhaust gases coming from the combustion chamber)