How Gtr Turbos Work

[BillyMako]

If an RB26 is running 12psi, is it both turbo running this boost or both running 6psi to make 12psi???

[marky]

If an RB26 is running 12psi, is it both turbo running this boost or both running 6psi to make 12psi???

both will be making 12psi

[and3_3]

As far as i know both the turbos will be pressurizing to 12 psi but the engine wont be receiving 24 psi somehow I THINK.

[thrtytwo]

of course it doesn't receive 24PSI

[and3_3]

So how does it work then? How can two turbos that make the same boost but don't increase the total boost volume and still make more power??

[thrtytwo]

cos think bout it, the PSI will only increase as the air is compressed further, when the air leaves the turbo into the the intercooler and on the way to the intake plenum it stays at the same compression level it already is, just theres more of it trying to get in, the air from another turbo cant compress the air from the first turbo if its at the same PSI. If however one turbo was running 10 psi and one was running 20psi i think, not sure though, you would end up with a total of 15Psi in the motor ??

edit: just thinking as well pressure is relative, 15 psi in a 10lt container is a lot less air than 15 psi in a 20 lt container. so the turbo isn't sending out a static '12 psi' its pushing air until the pipes its filling reach 12psi, both turbos know when that pressure is reached and stop, i guess 2 turbos work half as hard as 1 on its own ?

to answer the first question that doesnt mean theyre both pushing six, cos theyre both a part in the same system, the psi in that system is always the same for both turbos.

the way your thinking about it basically is that both turbo's are sealed off, reach 12 psi in a certain volume. and then both release they're pressurised air into a container the same size as each of the individual originals, but even then it wouldnt create 24 psi cos unless u have 24psi behind it it wont squeeze in

[and3_3]

So it doesnt put more air in just puts the same air in faster?

[thrtytwo]

So it doesnt put more air in just puts the same air in faster?

technically i think so, if there both putting out the same amount of air as one, into the same size pipes as 1, at the same rate, it should spool up the same amount of air as 1 turbo in half the time, but theres probably some efficiency loss to the effect of maybe taking 60% of the time of 1 turbo instead of 50%, i dont really know lol, too late to wrap my head around this

[marky]

Think of it in terms of volume of air rather than pressure. eg. Two turbos running at 12psi will supply twice the volume of air as one turbo running at 12 psi.

[tacker]

This basically turbo shuffle one compressor moving more air then the other. If one was to make 15psi and the other 10. The turbo producing 15psi would push the 10 psi back through the turbo it came from.

[Sklyn]

Where exactly is the PSI measured at?

[Bumblebee]

plenum...

and yes 2 turbos @ 12psi push twice the volume of air as 1 turbo pushin 12psi. u dont add extra psi just because of another turbo. u could have 5 turbos running 12psi... still gonna be 12psi but with a shit load of air

The turbos still work just as hard as a single turbo because its still spinning @ whatever rpm it needs to make 12psi.

pretty simple stuff really

[paulr33]

why?

why does two turbos @ 12psi = more power than 1 turbo at 12psi?

pressure != volume

why is map sensor flawed

pressure != volume

why is afm better?

pressure != volume

why does a GT30 make heaps more power at 12psi than a standard turbo?

pressure != volume

bwhahahahaha

[bubba]

why?

why does two turbos @ 12psi = more power than 1 turbo at 12psi?

pressure != volume

why is map sensor flawed

pressure != volume

why is afm better?

pressure != volume

why does a GT30 make heaps more power at 12psi than a standard turbo?

pressure != volume

bwhahahahaha

lol nice work

[BillyMako]

So 2 turbo putting out 12psi are pushing twice the amount of air into the engine than one!

[WRRR]

So 2 turbo putting out 12psi are pushing twice the amount of air into the engine than one!

No!

Two turbos pushing the required engine air volume at 12 psi will be the same as a single pushing the same required engine air volume at 12 psi - Temperature being equal and assuming the turbochargers have the capacity to deliver the load.

(P1*V1)T1 = (P2*V2)/T2

P = Pressure

V = Volume

T = Temperature

Edited November 7, 2008 by WRRR

[(OO)SKYLINE(OO)]

If an RB26 is running 12psi, is it both turbo running this boost or both running 6psi to make 12psi???

So how does it work then? How can two turbos that make the same boost but don't increase the total boost volume and still make more power??

Good questions!

I too have been wondering about this.

Interesting answers too.

[Bumblebee]

pressure does NOT = volume

pressure is pressure

volume is volume.

and WRRR is wrong. yes 2 turbos pushin 12psi is pushin twice the VOLUME of air.

[Bakes]

It just works and it works good.

There, thats my technical answer to the question

[noakespg]

Im no expert on the matter, but from my way of thinking, the PSI is built up by forcing more air into the cylinder as a turbo works more like a 'pump' than a compressor.

The more air (ie volume of air) you bump into the cylinder the more pressure builds up. When this pressure builds up to 12 psi the wastegate opens.

Therefore does that mean that 12 psi from 2 turbos just means that each is generating 6psi. The benefit therefore is quicker build up of boost at lower revs and less strain on each turbo charger.

I thought that PSI is a result of a higher volume of air forced into each cylinder.

Like I said, no expert on the matter.

I just want to understand how it works

Edited November 7, 2008 by noakespg