Dumb Q #1: Benefits of Larger Turbo

GTti

GTti

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starlet3SGTE said:
You get a 4 and 6 inch fan. Both run say 2K watts(just an example) yet the 6 inch fan will draw more condensation out the the area.... thats a fact.... the turbo will and does work under the exact same principle... its just a fan that compresses large amounts of air in as compact as it can making it nice and dense to through into the intake of the engine...... therefore the larger the compressor the more air it can and does force in but at the same time not changing the flow rate....
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Now direct the air flow of the fans down a tube and measure pressure at the other end. If one is creating more pressure than the other, then give it a wastegate and bleed off some watts.

Doesn't matter what the larger fan is able to do, were running at the same pressure with both fans not generating any excess heat.
 
GTti

GTti

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Adam_Glanza said:
why would you bother changing it if you could get the same results @ the same psi neway?
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To run high boost without generating heat as a by product like a smaller compressor would.

I'm beginning to wonder if you actually read anything Adam :p
 
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Adam_Glanza

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well maybe we all have ideas, and if im wrong im wrong but im 99% sure im right.

like i said aslong as the tube has the capacity to flow the air then yes i dont see why not?

and if both turbos were running @ say 1 bar then it wouldnt be creating any excess heat
 
Dan3SGTE

Dan3SGTE

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GTti said:
Now direct the air flow of the fans down a tube and measure pressure at the other end. If one is creating more pressure than the other, then give it a wastegate and bleed off some watts.

Doesn't matter what the larger fan is able to do, were running at the same pressure with both fans not generating any excess heat.
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yes, same pressure but more volume.... pressure and volume are 2 separate things... Air can flow at a certain pressure down a tube but doesnt mean the volume cannot be increased while doing so..... (providing the diameter of the intake piping is more then large enough for the increase in volume)..... as if it wasnt then the increase in volume may cause more pressure as it has to go somewhere, and quicker..... the speed of flow will indicate the pressure increase...

Are you basically saying that it is impossible to produce a larger volume of air at the same pressure? In any circumstance?
 
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Adam_Glanza

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exactly wat your saying.

a bigger turbo @ the same pressure will always deliver more air aslong as the piping is big enough to allow it.

him saying a hose and a jet engine etc isnt exactly realistic its 1 extreme to another.

like i said with the fans and the blooomin hairdryers.. but i guess once hes right hes right?
 
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villen25

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okay, here is an example... please let me know if it makes any sense


an one inch pipe flowing @ 10psi to full a bucket & a 4 inch pipe flowing at 10psi

wouldn't they full the bucket at the same time?

does it make any sense, because i was always wondering the diffence in 10 psi on a ct9 and 10 psi on a td04, i understand both sides, BUT who is actually correct:confused:
 
Dan3SGTE

Dan3SGTE

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But water cannot be compressed so its completely different..... the larger turbine will compressor "more" air at the same pressure....

PS.. the only difference in what your saying is the bigger pipe will have alot less stress on the walls of the pipe as it would be alot more "free flowing"
 
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Dan3SGTE

Dan3SGTE

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daveburwash said:
A bigger Fan (turbo) will flow more air at the same pressure than a samaller one. This is about flow of air not pressure
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exactly... "more air" the volume is larger but at the same pressure through the pipes.... unless your pipes were too small/ restrictive to suit the increase in volume then the pressure would/should theaoretically rise...
 
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villen25

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starlet3SGTE said:
exactly... "more air" the volume is larger but at the same pressure through the pipes.... unless your pipes were too small/ restrictive to suit the increase in volume then the pressure would/should theaoretically rise...
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ok, so that is the answer... the pressure is not different, just the flow, right. how do you measure flow?
 
Dan3SGTE

Dan3SGTE

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making sense and being right is 2 different things.. in this case its not entirely true what hes saying... it will still allow more compressed air to flow at the same pressure.. that is what gives the extra power... thats what this whole topic is about......

i do see what hes saying, always did as hes very intelligent, but not correct on this one.... ots not about the heat efficiency of the turbo as thats his answer....
 
ashygt

ashygt

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GTti said:
It doesn't! It flows the same!

Air mass is calculated from density & volume and density is calculated from temperature and pressure... HOW can it flow more air at the same pressure. It can't!





So if the pressure is the same (9psi) with an intake temperature of 20c that means the density of any turbo at 9psi is the same. Mass is calculated from density and volume (engine capacity/rpm). It will be the same mass of air entering the engine - it's impossible for there to be more.

So it makes the same power as long as both are in their efficiency range.

I doubt a TD04 at 9psi would make more power than a CT9 at 9psi.

A TD04 will make more power than a CT9 at 15psi due to aditional heat and its efficiency.
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at 9psi=o.6 bar i made 169bhp on a td04 i dont reckon a ct9 could get that at the same boost level mate
 
Rory

Rory

Lifer
GTti -
I understand what your saying, as the map sensor will see 9 psi, weather its the ct9 or anything else.
But with a larger turbo, the volume produced is alot more than a smaller turbo, therfor, there will be more air in the cylinders, thus creating more power.

Im not arguing with you as you seem very intelligent (sp), and yes i can see your point. ;)
But as said, a bigger turbo will produce more power due to the volume of compressed air it can flow.
 
GTti

GTti

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Consider a bike tyre which is flat. You have both a hand pump and a larger capacity foot pump. You have a guage on the line to see the pressure before the valve.

With the hand pump you will see a lower pressure on the gauge than the foot pump, decreasing in difference as the flow slows and the tyre pressure builds. Once they are the same pressure the flow will be the same no matter what the pump used.
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I'm waiting for the geeks on the Daihatsu forums to get a proper answer. It's host to some very clever chaps but they're all Australian and in bed.

I'm not arguing either, but I can't see why from what anyone has posted - so untill I can see facts or understand I wont blindly agree to anything :D
 
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