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

[wortdog]

As an example, in the Buick world there is a range of 3 turbos that all use the same compressor housing and wheel, the TE44, PT51, and PT53. The TE44 using a T350 70-trim exhaust wheel is rated at around 580hp at the crank, while the TE53 uses a slightly larger T04B 69-trim exhaust wheel and is rated at over 610hp at the crank.

There's also a TE60 turbo, which shares the same exhaust wheel as the TE44, but has a larger compressor wheel. Most vendors rate them at exactly the same power level.