How Gtr Turbos Work

[Bumblebee]

knowledgeable?

lol ok

1 turbo = 10 makes all the sense in the world

what he says makes sense.. sorta.. but every turbo flows different amounts of air. n thats a fact..

1 single = x amount of power

2 of the same x = alot more power...

if it wasnt the case, then ud use just 1 turbo to get every job done

Edited November 9, 2008 by Bumblebee

[noakespg]

WRRR is right.

PSI = Pressure per square inch

This is a measurement of how much air per square inch is in the plenum.

The Plenum will not change no matter how many turbos a car has.

The reason 1 GTR turbo cant make the same power as 2 is because it is because it cannot move enough air fast enough to reach the desired power level.

You are right in saying that volume is important. However, 12 psi is 12 psi.

Both turbos are pushing air through to reach the desired boost level. It just means they can get there twice as fast with half the amount of work each.

Thankyou very much for your answer WRRR

[Bumblebee]

lol pressure per square inch??

its actually POUNDS per square inch

and no the reason 1 turbo doesnt make enough power is because it doesnt supply enough air mass, which is volume not pressure.

Thats y u can make 300kw with gt'ss running 20psi+ or run a single t04z running half the boost to make the same power.

It flows more air. Power is made with the amount of air (volume not psi) and fuel u have in ur engine at any given time

More air n fuel = more power, but it is true more psi = more air BUT when a turbo reaches its maximum flow, it doesnt matter how much psi more u add, it doesnt mean more flow.

Just more heat

[some_cs_student]

Gareth

I have been trying to keep it simple. There is more to it in terms of tune, cams, compressor design, etc.

Try this analogy (I just wrote all the stuff below not knowing how to explain this simply and then this came to mind).

Keeping it simple ay, I've been working in IT for a while, keeping it simple doesn't exist in most cases

Thanks for the detailed explanation, it makes sense, I just need to re-read it when I'm awake again, I think other posters in the thread probably have a valid point but there are a lot of mis-interpretations happening in the thread

Anyway, if a mod could clean and sticky this, OR at least add it to the tutorial page that would be great

[noakespg]

lol pressure per square inch??

its actually POUNDS per square inch

Your right mate. It was a typo.

No one is saying that volume of air is not important. But to turn around and say that WRRR is outright wrong when he makes a statement is just counter productive. The point he was trying to make was spot on.

[Bumblebee]

Like i said b4.. he was right.. sort of.

simple

all u gotta do is go through the bullshit he said and u will find truth in what he says, but to simple say, adding another turbo wont make power is the stupidest thing to say because if it was true.. then no1 would twin turbo any kind of engine

a single turbo can only do so much, do much less than what an engine can swallow, thats y ppl run bigger turbos and make more power with the same psi/boost/pressure.

my rotor made 240rwkw on 8psi.. single turbo... a stock gtr wont make 240rwkw on 8psi... with upgraded turbos u can. Flow is the key.. not just psi.

psi only gets u so far, Volume/flow is the only way to make power.

[Kranker]

people make more power with the same psi becuase the turbos are more efficient, ie colder, more dense air...more air per unit volume.

saying that volume is the only answer is rediculous. no matter how much flow or boost ur running, your 500cc cylinder will always take in 500cc of air. volume of the cylinder is constant, same with the plenum, its a fixed volume.

turbos allow engines to make more power because there is more air in this same volume. the air is under more pressure, ie more air crammed into the same space.

Edited November 9, 2008 by Kranker

[Bumblebee]

i see what u mean... volume on n/a goes outta the window on a turbo engine

Volumetric efficency is what im talkin about.. N/a engines r about 80% efficient

Turbo engines go over 100%. 500c will take 500cc of air... pressured air has more mass per square inch...

So if u were to take that pressurised air, and let itself decompress, ull have more air than 500cc worth...

Dude u can try to argue WRRR's point but u cant win. Ive been dealing with these things for a very very long time. i know what works and what doesnt. Why it works or doesnt. Its my job to know

so unless all my cars have been mistakes or flukes... i think u should just read the information and learn from it.

[WRRR]

Mein Gott.

Talk about mixing up terminology and going in circles. To try and bring some sanity to this thread and stop some poor soul getting lost I shall steal from others -

"A turbocharger is an exhaust gas-driven turbine that compresses the intake air, increasing the horsepower and torque of an engine by increasing volumetric efficiency. This means that by compressing the air and increasing the density, you use a given volume of engine displacement more efficiently (volumetric efficiency). Denser air means more air atoms and more fuel atoms can be added into the engine. This makes more power."

If you want a relativly simple explanation (remember this topic fills books) including temp effects, turbo design and the basic calculations behind them go here - http://www.gnttype.org/techarea/turbo/turboflow.html. It aint perfect but it is not too bad.

Bumblebee - I respect the fact you are a mechanic and I am sure what you have been doing is resulting in positive outcomes. However I believe you are getting the terminology mixed up and confusing yourself and others. Have a read you might be surprised.

Last comment I shall add to this thread.

Sayonara.

[Bumblebee]

Finally were on the same page hahahah yay