*sniff* thanks for making me feel small...*sniff*

 

it's not about the psi. bigger make power witht he same boost because it have a bigger inlet to suck in more air. 2.75" stock compare to 4".

 

no that has nothing to do with it, its the size of the turbo itself that will make it flow more

 

I didnt think the gt35 made that much more HP than the stocker @20psi
Ill tell you what i think bigger turbo = cooler air , less back pressure and then you can run more timming and the ability to move more air (higher psi)...... (This is by no means is the "facts" , just my out look of it)
Witch iam prob wayyyy off

 

that is a huge a$$ turbo, I cant believe that

 

wow, i give up....

 

yuck, i prefer the baby bear factor, just right is best.

sorely wrong, if you had a gt35 with a 2.75 inch inlet you'd still make more hp than a 20g with a 2.75 inch inlet.

yes you are pressurizing the intake manifold, but with what kind of air? hot air will create more pressure htan cold air, if your compressor puts out colder air then you will move more mass.

now we're getting into part two, i thot i could buy you off with the cute pictures but here you go:

if we're gonna talk about ve then the ve is also a part of the reason that the bigger turbo will make more hp at the same boost. this is in fact however an ancillary benefit of the larger turbo moving more air, or rather something that is necessitated by the compressor moving more air.

in order for the turbo and engine to be able to ingest more air mass the hot side must have more volumetric efficiency (we've already established that the cold side has more efficiency, or rather not more efficiency but more capacity).

you can't shove air (or anything) into a funnel and not expect things to back up. so the same goes for air, if you have a big cold side and a tiny hot side (which is where the air that goes in, comes out) then you will have some backpressure, this is one of those key terms in automotive speak that few people actually understand. but we'll say this, it's when you're **** retentive and you can't push the poopies out. if yer mouth is eatin more than your anus can expel, lack of hp is the least of your problems savvy?

so with larger compressors usually come larger turbines and larger turbine will allow more hp related air flow with less backpressure (which is how the flow relates to hp). now this is the case because in turbo cars the turbine is a big backpressure, it's basically a wall outside the engine on the exhaust side (it's like a butt plug). so any time you can make the turbine larger you're making more power, this is of course maintaining that you are actually still spinning the turbo. this is why you can put a gt40 on a dinky 2l and still make 700hp, provided you have enough rpms to get up there. SO TWO IMPORTANT POINTS IN THIS PARAGRAPH, HP COMES FROM LESS BACKPRESSURE, HP COMES FROM MORE FLOW! both of which are products of a larger turbo.

now if you didn't have a bigger turbine with your bigger compressor then you're eating like fatty mcfatten and you're pooping like a pigeon which gives you big problems, mainly your engine will run like crap, your turbo will surge like a pig and your egts will suck *** too.

which brings me to the next point, if you have higher overall efficiency then you will have good combustion pressure and not excess heating and you'll be able to TUNE more power, which is the last variable and the LEAST to do with the actual physical setup. but it is the portion that the end consumer can control tha most which makes it very important and quite relevant and also stil totally pertaining to physics.

so why don't we all run really efficient turbos? cuz they're slow to spool. and that's the only reason.

so if you're gonna be the magic person that makes the turbo that spools instantly but compresses air efficiently and still provides intercooling capabilities without driving off the engine (scavenging exhaust gases like a real turbo should), you're a millionaire for real!