xDJ DUBx's 03.5 Pure White LX-T

[Wagonbacker9]

theres a topic?

I still want to know, is 10psi on a t3 the same as 10psi on a gt25r???

no.

 

[xDJ DUBx]

Do you know that or do you just figure? I've heard good arguments for both sides.

 

[Wagonbacker9]

Do you know that or do you just figure? I've heard good arguments for both sides.

at 10 psi, a T3 is flowing more air.

 

[xDJ DUBx]

Wheres Fish, he was the one who made a good point of psi being the same, no matter the turbo.

He said something like, psi is the measure of air and its a constant so if you're making 10psi, you are making the same thing no matter the source because its constant.

Or some s*** like that.

 

[Wagonbacker9]

Wheres Fish, he was the one who made a good point of psi being the same, no matter the turbo.

He said something like, psi is the measure of air and its a constant so if you're making 10psi, you are making the same thing no matter the source because its constant.

Or some s*** like that.

i believe looking at the flow maps of the 2 turbos side by side would explain it best. I see where he's coming from, but I believe the physics of it is a little more complicated than that. if I'm proven wrong, awesome... so be it.

 

[Laser Blue]

the same amount of pressure is not necessarily the same amount of air. Think of two boxes; one is 3' cubed, the other is 10' cubed. You can fill them both with air until they hold 10psi. Which will contain more air?

 

[xDJ DUBx]

That sounds more like piping size over turbo size though.

I'm not trying to prove you wrong Carl, I would just like to know cause its been bugging me forever.

 

[Wagonbacker9]

I'm not trying to prove you wrong Carl, I would just like to know cause its been bugging me forever.

I know you're not... my point is I'm more than happy to have that statement challenged.

 

[fishdonotbounce]

I've thought about this a bunch since I first talked about it with you and the other guys dub.

If you strictly ask if the pressures are the same then the answer is yes. The reason that bigger turbos deliver more and therefore different power at the same pressure is because they have a higher mass flow rate. Mass flow rate is not only a function of pressure, but also a few other variables.

In one of its simplest forms, the equation reads mass flow rate = density * area * velocity. Looking at this equation alone, you can see that area is a factor. Bigger area = more air = more power.

It's a LOT more complex than that but for the sake of not going into thermodynamics, I kept it simple.

 

[Wagonbacker9]

I've thought about this a bunch since I first talked about it with you and the other guys dub.

If you strictly ask if the pressures are the same then the answer is yes. The reason that bigger turbos deliver more and therefore different power at the same pressure is because they have a higher mass flow rate. Mass flow rate is not only a function of pressure, but also a few other variables.

In one of its simplest forms, the equation reads mass flow rate = density * area * velocity. Looking at this equation alone, you can see that area is a factor. Bigger area = more air = more power.

It's a LOT more complex than that but for the sake of not going into thermodynamics, I kept it simple.

short version:

bigger turbo is more efficient at higher boost, consiquently it delivers more bang for the buck at a given PSI...

fair?

 

[fishdonotbounce]

That's a fair way to put it.

 

[xDJ DUBx]

So the answer is no, they're not the same? You guys are getting crazy with it. lol.

 

[fishdonotbounce]

The pressure is the same. The power that you get from the turbo at the same pressure is not.

 

[xDJ DUBx]

Cause the air contains more (blank) in that pressure due to the bigger turbo size, similar to hot air compared to cold air with the turbo?

I put blank cause I couldn't come up with the correct term for what I'm talking about. ha

 

[fishdonotbounce]

No. You're just simply putting in more air.

 

[xDJ DUBx]

Ok ok, so comparing a GT25R@10psi to a T3@10psi, though the pressure is the same, the rate at which the air gets from point A(turbo) to point B(motor) is not the same, the T3 can push air quicker from A to B than a GT25R.

Now I got it, right?

 

[fishdonotbounce]

Lol still nope. The velocity of the air will differ but the reason that you get the difference in power is due to the mass flow rate or the rate at which mass (in this case air) is put through. Higher flow rate = more air not necessarily at a faster speed but more air nonetheless.

Like I said, it is A LOT more complex than that. There are heat losses, thermal efficiencies, and a bunch of other factors that is something that takes a few thermodynamic courses to understand.

 

[Protege03ak46]

ehhh. did you guys ever take science!?!?!?!

 

[Wagonbacker9]

Lol still nope. The velocity of the air will differ but the reason that you get the difference in power is due to the mass flow rate or the rate at which mass (in this case air) is put through. Higher flow rate = more air not necessarily at a faster speed but more air nonetheless.

Like I said, it is A LOT more complex than that. There are heat losses, thermal efficiencies, and a bunch of other factors that is something that takes a few thermodynamic courses to understand.

the key words were "more efficient" trying to understand more than that without highly scientific terminology is just... beyond us... so.... just stick with that.

 

[xDJ DUBx]

I hated science. Barely passed by the skin of my teeth. I kinda get it but that is confusing.