can someone please sum this up for me a a paragraph or two?i have been reading and searching and it seems there are many different opinions on which is better and why.

i am assuming from what i have read that the smaller the A/R the quicker the spool and the less power on top,but how does that relate to the T3,T4 and the V-band directly?

also what is the best A/R for say a 2.0 compared to a 2.4 or does even that depend on final rpm range of that car?

say a 2.0L car with a power band of 4500-7500rpm with a 6266 turbo vs a 2.4L with the same power band,what A/R do these guys want on their 6266's?

or a 2.0L with power from 6000 to 9000rpm and a 2.4LR with the same range running a 6766?what A/R do they want compared to the lower revving car and what compared to each other if not the same A/R?

i'm guessing the higher revving cars want the higher A/R,but what about the 2.0L compared to the 2.4L and why?

thank you.

 

Higher RPM equal higher HP that your capable of. 6266 numbers have to do with the actual compressor wheel and exhaust wheel. You power band is where you make your HP. If you go find a dyno chart for a car, you'd see that the "power band" is when your recieving most of your HP and at what RPM. The application of what wheel size you want for both compressor wheel and exhaust wheel dependon what your trying to achieve. Having a smaller exhaust wheel and bigger compressor wheel would offer you quicker spooling and a wider power band. But the down side is that you'd loose some HP in doing so. There's a lot of science that goes into what you need but it all depends on what your going to use it for. Bigger turbo's can also be good depending how your setup is built around it to accomidate it and make use of all that power. So to say that having a big turbo isn't good because of turbo lag isn't right, you just need to have the right setup for what you need to do.......