nitrodann

I asked him if he was running a HUGE a/r and low low boost.

Would it even be theoretically possible this way?

18psi

iTrader: (76)

nope

Girz0r

iTrader: (1)

What is the power ouput that he's claiming with this magical setup?

JasonC SBB

Maybe some of that mass turns into energy!
E=mc^2 you know!!

stefanst

iTrader: (1)

Which is, of course, how the law of conservation of mass was ultimately proven to be wrong. So either way he was wrong starting with word #3

18psi

iTrader: (76)

The turbo kit is called "Alfabert Omegastein II" with optional doodoo box and every part comes in a separate box over a period of 3 years.

stefanst

iTrader: (1)

Upgrade to "Supernova" for the low-low price of a few trillion tons of hydrogen.

Alumilo

iTrader: (1)

I guess I was up too late. Anyway I'm just trying to break down the concept to see where the 2.5" would be advantageous. By what means does the larger pipe allow increased flow rates? The damn title of this thread has theory in it after all...

EDIT: WHO TOOK MY CAT AWAY!?

patsmx5

iTrader: (16)

The turbine on the turbo is extracting energy from the exhaust to drive the compressor. The total amount of thermal energy in the exhaust is called enthalpy. The amount of energy at any given point is the mass flow times the enthalpy. Energy = mass flow x Enthalpy

The change in enthalpy across the turbine is how much energy the turbine extracted from the exhaust. You want to maximize this to make it spool faster. It takes a certain mass flow to spool the turbo, the quicker you get that mass flow, the sooner you get boost.

A larger exhaust pipe after the turbine lowers the pressure on that side of the turbine. The bigger the pipe, the lower the pressure will be. This improves the flow in the system, so mass flow goes up at any given boost pressure. So more mass flow everywhere from spooling to redline.

This has two big benefits. Time to boost is shorter, and power at a given boost level will be higher. Smaller benefit would be reduced turbine inlet pressure, which will make the motor slightly more knock resistant too due to less internal EGR.

HexRX

Work through the system would be = Mass flow x Enthalpy through the turbine - the abs value of the Mass flow x Enthalpy through the compressor;

You also want to minimize the work that the compressor has to do, it is a small amount but if you can optimize this there are gainz to be had. Also the pressure ratio of the turbine is directly related to the temperature, if you can increase the temp prior to the turbine you can increase the delta of the enthalpy which will give you more power. Yet we are a bit limited on a metallurgical level here as melting pistons and such is no fun.

gtiracer06

from what i always understand. bigger will give you more top end, and better peak hp....smaller, but not too small will give you better low end

aidandj

iTrader: (5)

That's wrong.

fivehundredton

Pat just explained it

albumleaf

iTrader: (7)

No. Please stop regurgitating this garbage.