Originally posted by GNSCOTT
Syclone, instead of a smart *** response, why not give an answer. The more air a turbo pushes into an intercooler where there is a blockage, the tigher the air will be packed causing heat? is that wrong??
GNSCOTT, he's really right tho. As I understand it, boost is a product of restriction, not so much the turbo. IOW, the boost in your intake is the EXCESS air the turbo is flowing before the engine can injest it.
Now, lets sy your engine is heavily modded. Your motor can flow 700fm. For say a stock turbo to generate 700cfm, it needs to spin at 100,000 rpm. I believe the heat comes more mechanically then due to compression, whereas say a larger turbo will only need to spin 60,000 rpm to generate that same 700cfm. It will generate less mechanical heat.
As usual, maybe my terminology is wrong, but I know what I am trying to say. This is the REASON to go with a larger turbocharger after all.
As for a car with a larger tb giving the seat of the pants increase, its most likely due to this....
a stock TB can flow say 500cfm (or whatever..just a number) at WOT. A 65 TB can flow that same 500 cfm at say 1/2 throttle. SO it gives the illusion it made more power, when it simply moved the power to a lower throttle opening. This feels like you gained part throttle power, when in reality you are flowing previously WOT air, at less than WOT.
I am very interested in this thread, because I have a 70mm TB for my new mill, and wanna see what the deal is. I'm gonna tune for and use it, just cuz chicks dig it. I'm not expecting it to make me much more power. I have a TE63-1 which has a 3" outlet, 3" IC pipes, and wanted a 3" TB to remove the limiting link in my intake track. (My MAF pipe is 4" so I removed some of the pre-turbo restriction John mentioned as well) I just wanted to get the whole combo as optimized as possible. I thought I was doing the right thing.
http://www.turbojim.com:231/jim/rightside.jpg
http://www.turbojim.com:231/jim/leftside.jpg
Is what I got going together so far.
Now to read the rest of this thread....