Boost Bars? Intercoolers?

[Guest BrainFluid]

...

 

So i know 'how' an intercooler works & i'm pretty sure that boost bar is how much your turbo is compressing the air into your inlet manifold but,,,

 

and sorry for being so lame...

 

Could someone explain it to me like I'm a 2 year old?

 

I have searched but, well you know, this is much eaiser that trawling through random threads with only 2 key words.

 

Ta much o,

 

Nathan.

[Jonmurgie 2]

Intercooler - when the air is 'forced' through the intake system by the turbo it get's hot so the intercooler helps cool the air with internal airways for the air and fins between the airways to disipate the heat. Intercoolers are usually mounted where there is airflow through the car when moving to help cool them down and remove the heat.

 

Boost Bar - this is a chocolate bar that's quite tasty and availalbe in a few varieties

 

'Bar' in relation to turbo boost - turbos produce forced induction using turbines to speed the flow of the air. This in turn causes an increase in air pressure. Air pressure is measured in 'bar' or 'psi'. 1 Bar = 14.7 PSI. So a common phrase you may have heard is "my car's running a bar of boost"... that means it's turbo is forcing the air through the engine at a pressure of 14.7 PSI.

 

Hope that helps a little

[Paintguy 0]

Boost Bar - this is a chocolate bar that's quite tasty and availalbe in a few varieties

Classic!

[Guest BrainFluid]

Classic!

 

Thats a biscuit isnt it?

 

 

Right, thanks Jon. Thats what I thought

 

So how does it all connect to each other? I mean so the exhaust drives the turbo, which drives the thing that forces air into the engine (through the inlet manifold?). Is it just the case that because the air that its forcing in has been pre cooled, that when the compression of the air heats itself up its at a lower temp just because of being precooled?

 

I'm presuming then, that this pre cooled air has to get to the turbos forcing thingy. Does this just go through the normal air system intake? Is that where the air comes from for the

 

How do you measure the bar of the turbo's boost?

 

Cheery much.

 

Nate.

[M3Evo 0]

The turbo draws air into itself through the air filter. The air is then compressed by the turbo.

 

The act of compressing the air causes it to heat up and this heat needs removing so the hot air is passed through an intercooler.

 

This process removes some of the heat put in by compressing it.

 

From the intercooler, the air flows to the inlet manifold.

 

Any pressure gauge, like the one on a foot pump for example, can be used to give a reading of the inlet pressure.

 

Bar is a measurement of pressure and doesn't relate only to turbos etc. You'll see millibars on barometers which are just calibrated in thousanths of a bar.

 

1bar = 14.7 psi as above so in the case of my car, I'm running about 0.5bar of boost which is 7.35psi.

Edited March 5, 2006 by M3Evo

[Paintguy 0]

Just working my way through your technically-minded reply....

 

Put very basically; the air comes in through the air filter, then on to the compressor side of the turbo, where it gets (surprise surprise) compressed.

 

The act of compressing the air causes it to heat up. It also picks up heat from the turbo unit itself. Now this hot air could go straight in to the engine, but the cooler the air the better, for many reasons, so it is generally sent through either an intercooler or charge cooler first.

 

This reduces its temperature, which as well as helping the engine run cooler, also makes it more dense. Denser air = more power.

 

 

Apologies to those of you who know how oversimplified my explaination is

 

Edit: Beaten to it, lol

Edited March 5, 2006 by Paintguy

[Guest BrainFluid]

Right.

 

So the air needs to go from the turbo past the intercooler and into the inlet manifold. All through air hoses.

 

I take it that this tunnel maze of air hose needs to be good enough to be able to hold a good amount of pressure as it will all be, urm, pressurised.

 

yup?

Edited March 5, 2006 by BrainFluid

[M3Evo 0]

Yep, absolutely right

[TEKNOPUG 3]

http://auto.howstuffworks.com/turbo8.htm

[Guest BrainFluid]

Hold on a minute...

 

Where is the turbo getting its air to compress from?

 

Is it getting it from the filtered air intake or not? If not, how is filtering the air that will end up in your engine?

[pdd144c 0]

1 bar = 14.5 psi

1 atmosphere = 14.7psi

[dee205 3]

The turbo gets it's air from the atmosphere via the air filter.

 

[M3Evo 0]

1 bar = 14.5 psi

1 atmosphere = 14.7psi

 

Ooh bugger me, you're quite right! :oops:

[Jonmurgie 2]

1 bar = 14.5 psi

1 atmosphere = 14.7psi

 

Now that's just being pedantic!!

[pdd144c 0]

Pedantic but correct

[Paintguy 0]

Hold on a minute...

 

Where is the turbo getting its air to compress from?

Both M3evo and myself have already answered that question for you in our earlier (and spookily similar!) replies.