This leads me to ask: Where is the Boost PSI measured? I always thought it was measured somewhere between the turbo and throttle body... If that's true, then 15psi is 15psi - Right??Alsontime wrote:I agree, I was using a GT28 on my KA-T around 15 psi and switched to a T04E at 15 psi and what a difference. You have to consider that both are running at 15 psi but the T04E can move a larger volume of air at 15 psi, increasing hp.
Yeah Cory- that's exactly what I meant-but I was referencing the volume as in CFM cubic feet per minute. volume is also relevant to mass and density. see below.nissanfanatic wrote:I think you intended to say either
A) DensityorB) Mass
You cannot measure air in volume, only the container in which the air is held. Air has no volume, it has mass, which is affected by density in a given volume container.
I think I understand what you are saying, all I know is it happens. Yes two turbos of different size blowing 15 psi may be equal, however the larger turbo is working less to match the smaller turbo which is maxing it's output, thus the larger one has plenty of forced air on tap when needed, where the smaller will leave the engine wanting more. In retrospect I see how you'd say it's the same, pretty much the only reason to buy a larger turbo is to push more boost, not to hold it back. To some the smaller may be suitable, but it's an addiction, and from many people's advice, it's better to go a little bigger in the beginning so you have some "growing" room in the future. I'm no scientist, I wish I knew how to explain it better and plainer- but it just makes sense to me.Justin VanWinkle wrote:Yes, I understand that... but I still am unable to see the difference here.
You just made the volume of air more at your intake, but the pressure is still the same; Therefor, you still only have 15psi at the intake of your head, and you can only squeeze so much through there.
In other words, you are increasing the size of your compressor; However, the space filled by the air from your compressor to your cylinder is still the exact same. So your volume is the exact same.
The reason I say this is because with the box fan theory you gave me, you are changing the size of the output holes. So now you would have to have a larger volume to be able to regulate at 15psi....
Make sense?
Make a new thread so we can discuss it.1991h9 wrote:that helped alot, but i need to know what i need to have to handle the power i`ll end up wanting, 350whp, i know i have to rebuild it because it has 177,000 miles, but it runs like a champ still. so what should i replace and upgrade. Thanks