When will the turbo spool? How much boost?

[eman2289]

Is it possible to find out when a specific turbo will spool on a specific motor, and how much boost there will be at various rpms?
Im pretty sure I would need the turbine sizes of the turbo in use, but what else would i need? Engine size, etc?
I'm not sure of the correct terminology, but will i need to know how much exhaust is given out at a specific rpm?

Also, If someone could provide me with the info and some sort of a calculator that is online or something it would be appreciated.

Thanks in advance.

 

[QWIKSTRIKE]

Is it possible to find out when a specific turbo will spool on a specific motor, and how much boost there will be at various rpms?
Im pretty sure I would need the turbine sizes of the turbo in use, but what else would i need? Engine size, etc?
I'm not sure of the correct terminology, but will i need to know how much exhaust is given out at a specific rpm?

Also, If someone could provide me with the info and some sort of a calculator that is online or something it would be appreciated.

Thanks in advance.

Go to Garrett turbos and check turbo lesson 101 and look for flow mapping.

 

[Doward]

Spool characteristics are primarily a result of turbine A/R vs Engine size

Smaller a/r = quicker spool (higher exhaust velocity)

Larger engine = quicker spool (more exhaust mass)

What size turbo are you thinking of, on what sized engine?

 

[madmax98]

Spool characteristics are primarily a result of turbine A/R vs Engine size

Smaller a/r = quicker spool (higher exhaust velocity)

Larger engine = quicker spool (more exhaust mass)

What size turbo are you thinking of, on what sized engine?

where would that put a 3.0 L with t3t04E .81 A/R turbine

 

[a_sesshoumaru]

i think it changes from one engine to another, i could not build any boost with my 7mgte with the stock ct26 if i revved to 6000rpm parked, and i saw a qr25de building 6psi doing the same thing and it was a 2.5L, but it revved a lot faster than the 7m.

 

[eman2289]

Spool characteristics are primarily a result of turbine A/R vs Engine size

Smaller a/r = quicker spool (higher exhaust velocity)

Larger engine = quicker spool (more exhaust mass)

What size turbo are you thinking of, on what sized engine?

Thanks. I know this info already. What I am looking for is solid, specific numbers. Some sort of equation possibly?
Kwik, ill be sure to look that up once I get home. Sidekicks are slow, ill check it out on my computer.