How hard is it to make 200hp?

[grosspolluter]

Relatively easy!

[InsanityInc]

The stock intake flows more than enough air for a N/A motor. So adding a bigger pipe is simply supurflous. The stock exhaust system does not flow enough and therefore leaves room for HP gain via bigger pipes.

Ok. This is the worst thought out statement ever. If the cross-sectional area of your stock intake pipe is roughly the same as the cross-sectional area of the stock exhaust pipe, do explain how upgrading the exhaust and not the intake is a good idea? You are aware that in order for exhaust to exit your engine, air first has to enter it through the intake, right?

Quote »As for intake cooling - the stock pipe is plastic and serves to insulate your intake air from the hot engine bay. Those aluminum intakes will transfer engine bay heat straight into your intake air. They actually heat the incoming air. You would be better off insulating the tube with fiberglass.[/quote]Plastic is not an insulator in this case. The plastic is going to heat up just as hot as the aluminum, it's just gonna take 5 minutes longer or so and then you're in the same boat. Also, the intake charge on an NA motor is FAR hotter than the underhood air. Underhood air is usually ~160-180F. The intake charge at WOT after warming up is well above 200F.

[A34D4ME]

Well, first off there is a lot more gas coming out of the exhaust because you are burning fuel in the combustion process. Not trying to be a jerk but if you think that the volume of air (gasses) entering your intake are equal to the volume of exhaust gasses you might want to check out "how stuff works.com" This is the chemical basis of the internal combustion engine.

As for the intake material - different materials conduct heat differently. Plastic will transfer heat at a much slower rate than aluminum or other meatals. This is why aluminum is used for radiators and the like.

Intake air in a N/A motor is determined by ambiant temptrature. The only situation in which intake is heated is when it is compressed as in forced induction because compressing a gas causes rise in temp.

Should you chose to take chemistry you will learn all about this stuff.

If any of this is unclear I'll try to explain in more detail.

[dickie]

<== taking cover.

[ORL240]

How hard would it be to make atleast 200hp or more? What would be needed?

Exhaust System (with Test pipe)Underdrive Pulleys.Ground Wire kit.Custom ITB from Suzuki ITB 750cc with custom Pleneum to run FRONT MOUNT COLD AIT INTAKE.Spark PLugs from DENSOSPARK PLUG WIRES from NologyNew BatteryStage 2 Clutch and Fidanza Flywheel.I also already have a Shaved Valves

Also...... I was thinking about doing engine internal work.What is needed for that? What kind of pistons and cams.I was thinking ........from Race Engineering . COmI would by bigger pistons and vavles and have the whole bore and port and polish thing going on. And also a new or used crankshaft balanced and cut.

I'm also considering 180 whp na ka. You would definately need cams and larger injectors along with a good engine management. A port and polish of the head and upgraded tb will help but I don't think internals will really make much difference when talking about est. 200hp. KA internals are overbuilt. Spend money you save on internals on haltech ems.

Keep us posted if u'r going to do dis.

[InsanityInc]

Well, first off there is a lot more gas coming out of the exhaust because you are burning fuel in the combustion process. Not trying to be a jerk but if you think that the volume of air (gasses) entering your intake are equal to the volume of exhaust gasses you might want to check out "how stuff works.com" This is the chemical basis of the internal combustion engine.

You're a complete moron. The amount that the fuel is adding to your exhaust gas volume is completely negligable for a few reasons:

1) The amount of fuel being injected is small. Generally your A:F will be between 13:1 and 15:1.2) When you react the fuel with the air the gass will get more dense due to the addition of the molecules from the hydrocarbons, but it will barely increase in volume.

So, basically, even if you think that every bit of fuel is extra volume, your exhaust would only be about 7% bigger than your intake, meaning that if you have a 2.75" intake, you'd need a 3" exhaust (give or take). Stock is around 2", if that.

Quote »As for the intake material - different materials conduct heat differently. Plastic will transfer heat at a much slower rate than aluminum or other meatals. This is why aluminum is used for radiators and the like.[/quote]Not really. Things conduct heat into them at different rates, but they conduct heat off their surface at the same rate. If you want proof, heat up a plastic cup in the microwave so that it's really hot and then touch it. The heat sensation you feel is the plastic cup transferring heat to your hand. Hell, just touch the top part of your radiator, which is actually plastic.

The real reason they don't use plastic is that it would be nearly impossible to mold plastic into the shape of all the fins on the radiator and make it thin enough. Plastic isn't as ductile as metal.

Quote »Intake air in a N/A motor is determined by ambiant temptrature. The only situation in which intake is heated is when it is compressed as in forced induction because compressing a gas causes rise in temp.[/quote]No, it also heats up if you apply a force to accelerate it due to a change in kinetic energy. Look up readouts for manifold-mounted AIT sensors. They generally go up to about 240 degreesF. The air in general through the tract is not getting cooled down.

Then you also have to consider friction (which is a huge deal with gasses, even along seemingly smooth surfaces), as well as heat absorbtion from the intake pipe and the manifold.

Quote »Should you chose to take chemistry you will learn all about this stuff.[/quote]I had to take 16 units of college level chemistry for my degree. Trust me, I may know a bit about what I'm talking about. The ideal gas law is just that, the IDEAL gas law. It's not a real-world application except for approximation or in a select few situations.

[A34D4ME]

LMAO! Dude you know absolutely nothing about chemistry.

You are saying that the gases given off by combustion are negligible? So you don't know that it is the expansion of these gases that powers your motor? So, a teaspoon of gasoline lit with a match will only produce one teaspoon of gaseous products? As for density - heat and expanding gases are more dense? How on earth do you arive at that conclusion?

The fact that liquid gasoline gives off copeous amounts of heat and gases is what makes the internal combustion motor work. And you are calling me a moron.

As for the specific heat index of different materials, I suggest you look up "specific heat." You will find that certain materials transfer heat faster than others. Aluminum faster than copper, faster than steel, faster than plastic, etc...

Bottom line, I'm always happy to share what I have spent considerable time, money and effort learning. There is no need to be rude or insulting and it certainly does no good to pretend to have knowledge that you don't have. These are real basic concepts and it's clear to anyone with even the most basic understanding of chemistry that you have absolutely no idea what you're talking about. Be civil and I'll be happy to explain things.

[A34D4ME]

You're a complete moron. The amount that the fuel is adding to your exhaust gas volume is completely negligable for a few reasons:

1) The amount of fuel being injected is small. Generally your A:F will be between 13:1 and 15:1.2) When you react the fuel with the air the gass will get more dense due to the addition of the molecules from the hydrocarbons, but it will barely increase in volume.

So, basically, even if you think that every bit of fuel is extra volume, your exhaust would only be about 7% bigger than your intake, meaning that if you have a 2.75" intake, you'd need a 3" exhaust (give or take). Stock is around 2", if that.

It's not about adding a small amount of gasoline to your air intake, it's about what happens when you burn it.

You know, that thing that happens when you ignite the mixture. Rapidly expanding gases and lots of heat. You do know what happens to that gasoline when it burns don't you? That thing that pushes down the piston, and makes the car go - or does that happen when the mixture gets more dense? How you even managed to come up with something so far from anything factual is beyond me.

I'm remined af Ace Ventura when he talks from his butt - "let me assk you a few questions." LMFAO!

You ought to try talking less and listening more - perhaps if you did this in chemistry class you wouldn't be making a fool of yourself. If you insist, I'll bring about 100 more people to this post to coroberate what I'm telling you.

[InsanityInc]

You are saying that the gases given off by combustion are negligible? So you don't know that it is the expansion of these gases that powers your motor? So, a teaspoon of gasoline lit with a match will only produce one teaspoon of gaseous products? As for density - heat and expanding gases are more dense? How on earth do you arive at that conclusion?

Expansion of gas isn't the same thing as more gas, idiot. Hydrocarbon combustion is an exothermic reaction, meaning it releases energy. In the form of heat, mainly. Heating a gas begets pressure. That pressure then in turn drives your piston. Gas pressure isn't the same thing as more gas. More gas in the same space WILL raise the pressure, but that isn't what occurs in the combustion chamber.

Regardless of the pressure of your gas, pipes have a certain CFM that they can flow. Combusting gas doesn't raise the amount of material in the reaction. All it means is that your exhaust is going to be more energetic than your intake.

Remember our good friend "The Law of Conservation of Mass"? You're basically saying it isn't true.

http://en.wikipedia.org/wiki/L...atter

Quote »The fact that liquid gasoline gives off copeous amounts of heat and gases is what makes the internal combustion motor work. And you are calling me a moron.[/quote]No, the fact that it gives off heat is ALL that makes it work. The fact that the liquid gas is converted into gaseous form has nothing to do with it, it's just the vehicle for enthalpy.

Quote »As for the specific heat index of different materials, I suggest you look up "specific heat." You will find that certain materials transfer heat faster than others. Aluminum faster than copper, faster than steel, faster than plastic, etc...[/quote]Once again you masterfully fail to understand what a concept actually means. They absorb heat faster or slower. That says nothing about how fast they give it off. Like I said, if you don't believe me feel free to touch the top of your radiator. Since it's plastic it obviously won't transfer enough heat to burn you, right?

Quote »Bottom line, I'm always happy to share what I have spent considerable time, money and effort learning. There is no need to be rude or insulting and it certainly does no good to pretend to have knowledge that you don't have. These are real basic concepts and it's clear to anyone with even the most basic understanding of chemistry that you have absolutely no idea what you're talking about. Be civil and I'll be happy to explain things. [/quote]I'm the one who doesn't know what I'm talking about? Right. Sure. This coming from the guy who just said that the law of conservation of matter is untrue. Are you going to tell me that the law of conservation of energy is wrong next?

[InsanityInc]

You know, that thing that happens when you ignite the mixture. Rapidly expanding gases and lots of heat.

You seem to be misunderstanding the fundamentals of chemistry. Gases don't "expand" when they react. Gases only expand to fill the space you put them in. The rising pressure of the gas due to heat forces the piston downward, which in turn creates space for the gas to expand into. Expansion is a result of moving the piston, not the cause.

Quote »You do know what happens to that gasoline when it burns don't you? That thing that pushes down the piston, and makes the car go - or does that happen when the mixture gets more dense? [/quote]It doesn't get more dense, the pressure rises.

Quote »You ought to try talking less and listening more - perhaps if you did this in chemistry class you wouldn't be making a fool of yourself. If you insist, I'll bring about 100 more people to this post to coroberate what I'm telling you.[/quote]http://en.wikipedia.org/wiki/I...ngine

Read up, kid.Quote »Once successfully ignited and burnt, the combustion products (hot gases) have more available energy than the original compressed fuel/air mixture (which had higher chemical energy). The available energy is manifested as high temperature and pressure which can be translated into work by the engine. In a reciprocating engine, the high pressure product gases inside the cylinders drive the engine's pistons.[/quote]Huh. Seems to me they say nothing about increased gas density OR expanding gases. Gee whiz, sounds an awful lot like everything I've said too. Maybe you should be the one paying attention.

[A34D4ME]

Let me try to explain this one last time. When you react gasoline with oxygen you produce heat and rapidly expanding gases. Of course mass is conserved. It's just that the molecules have been re-arranged from a liquid, such as octane(C8H10) and gaseous oxygen(O2) into gaseous products like CO2 and CO and various other stuff. It is in fact the expansion of gases that powers the motor. Heat, contributes to pressure by causing more expanasion of the gases. When gases expand but volume remains constant, you get pressure. You do understand that there is a direct relationship between heat, volume and pressure don't you?

Look, bottom line. You are throwing around terms that you don't even come close to understanding. I have a BS in biology - I know this stuff and I know that you don't. I'd even go so far as to say that the average guy on this forum with no formal education has a better grasp on this stuff than you do. In fact, your assertions are so increadably preposterous, I don't even see how I can continue this conversation. Just say the word and I'll create a post to bring hords of people here to point it out to you.

Dude, seriously, you sound like a guy screaming that the world is flat.

[InsanityInc]

Let me try to explain this one last time. When you react gasoline with oxygen you produce heat and rapidly expanding gases.

No, you don't produce expanding gases you goddamned moron. Light a bomb in a lead box. No expanding gases, because the gases have nowhere to expand. The PRESSURE of the gas rises.

Quote »Heat, contributes to pressure by causing more expanasion of the gases.[/quote]No, heat CAUSES pressure.

http://en.wikipedia.org/wiki/Ideal_gas_law

While not 100% accurate by numbers, the concept is still correct. If your temperature rises, so does your pressure.

Quote »When gases expand but volume remains constant, you get pressure.[/quote]This statement makes no sense. If the gas is expanding, then the volume isn't constant. Expansion means that the volume is increasing.

http://dictionary.reference.com/search?q=expansionQuote »ex·pan·sion (k-spnshn)n.

1. An increase in size. 2. The spreading out of a structure, such as a tendon.[/quote]If the size is the same, then there is no expansion.

Quote »You do understand that there is a direct relationship between heat, volume and pressure don't you?[/quote]Yeah, it's called the ideal gas equation. I linked it above here and it demonstrates how you're wrong. Increasing the volume DECREASES the pressure.

Quote »Look, bottom line. You are throwing around terms that you don't even come close to understanding. I have a BS in biology[/quote]Biology. Gee, I guess having a BS in biology obviously makes you the go-to source on engine chemistry. The **** are you smoking?

Also, I don't care how many moronic cronies you can get to tell me that "expanding gases" drive a piston. You could probably get just as many to tell me that NA engines need backpressure, or that ID is a legitimate scientific theory.

I've linked you to reputable sources that say you're wrong, what more do you want?

[A34D4ME]

Dude, I promise you. I have spent numerous hours learning this stuff. I know you think you understand these principals but you don't.

Trust me, from someone who knows, you are really confused. How do you think a gun works? No expanding gases huh?

Even though a blow gun does the same thing without heat.

What happens to watter when you boil it? Does it expand? If it is in a fixed volume does pressure rise? If you take pv=nrt and solve for p you find that p is a dependant variable where vnr&t are constant.

If you actually understood this stuff you'd know that you sound like a raving idiot right now. I refuse to have a battle of wits with an unarmed person. I'm just going to bring people here to make fun of you.

[InsanityInc]

Dude, I promise you. I have spent numerous hours learning this stuff. I know you think you understand these principals but you don't.

I know you think you know how to spell principles, but you don't.

Quote »Trust me, from someone who knows, you are really confused. How do you think a gun works? No expanding gases huh?[/quote]The gases expand once pressure moves the bullet. Just like the gases in your combustion chamber expand once the pressure moves the piston. It's the exact same effect. Gas expansion LOWERS pressure and happens after the pressure moves something, it's just an effect it doesn't do any work. You have your causation completely backwards.

Quote »Even though a blow gun does the same thing without heat.[/quote]Yeah, because you don't NEED heat to make pressure, it's just an easy way to do it. Your lungs compressing gas (the opposite of expansion, actually) causes pressure behind the dart which causes it to move and then the air returns to normal pressure again.

Quote »What happens to watter when you boil it? Does it expand? If it is in a fixed volume does pressure rise? If you take pv=nrt and solve for p you find that p is a dependant variable where vnr&t are constant.[/quote]Water isn't a gas, so it's irrelevant. You can't compress liquids. That's why hydraulics work.

Also, the fact that you just tried to apply the ideal GAS law to water is goddamned hilarious.

[A34D4ME]

LOL! LOL! LOL! LMFAO!

Dude! Increased gaseous products and heat try to expand and cause pressure when acting against a fixed volume. This increased pressure, as a result of heat, and a liquid becoming a gas or gaseous products, cause pressure. This forces the piston down. I bring up water to demonstrate that the same amount of substance takes up more space, or creates more pressure, in a gaseous state than it does in a liquid or solid state.

Do you even know how to explain the reaction that takes place durring cumbustion? Do you know that a teaspoon of liquid expands to something like 22 cubic feet when boiled? That's under 1 atm of pressure. Do this in a fixed volume of say 2.2 CF and you have 10 times the pressure. Pressure is the DEPENDANT VARIABLE.

Now please, you're killing me. Stop while you still have some amount of dignity left.

[InsanityInc]

Dude! Increased gaseous products and heat try to expand and cause pressure when acting against a fixed volume. This increased pressure, as a result of heat, and a liquid becoming a gas or gaseous products, cause pressure. This forces the piston down.

Liquid becoming a gas doesn't inherently cause pressure. Try running a combustion engine with an endothermic reaction and see how well that works out for you.

Quote »I bring up water to demonstrate that the same amount of substance takes up more space, or creates more pressure, in a gaseous state than it does in a liquid or solid state.

Do you even know how to explain the reaction that takes place durring cumbustion? Do you know that a teaspoon of liquid expands to something like 22 cubic feet when boiled? That's under 1 atm of pressure. Do this in a fixed volume of say 2.2 CF and you have 10 times the pressure. Pressure is the DEPENDANT VARIABLE.[/quote]Hahaa haha. How retarded are you? It expands to 22 cubic feet because the water vapor will spread out until it's in equal concentrations across those 22 cubic feet. You don't get 22 cubic feet of water vapor you tard. If you look at those 22 cubic feet most of it will be air, not water vapor. Damn, you're an idiot.

[A34D4ME]

Gee, I don't know - perhaps it has to do with the molecules repelling each other. Basic stuff and yet a light year over your head. I don't suppose you've took organic chemistry?

Here is an excerpt from "how stuff works." Do us all a favor and go do a little reading and stop pretending to know stuff you don't.

See the quote? What's that about expanding gas? Gee, looks like your full of it after all.

"If you put a tiny amount of high-energy fuel (like gasoline) in a small, enclosed space and ignite it, an incredible amount of energy is released in the form of expanding gas."

Now, stop calling names and go learn something.

[InsanityInc]

Gee, I don't know - perhaps it has to do with the molecules repelling each other. Basic stuff and yet a light year over your head. I don't suppose you've took organic chemistry?

Molecules of the same substance don't repel eachother. If they did, you could never form liquids or solids, or any compound at all. Are you talking about electrostatic repulsion? All that does is stops molecules from passing through eachother.

Quote »Here is an excerpt from "how stuff works." Do us all a favor and go do a little reading and stop pretending to know stuff you don't.

See the quote? What's that about expanding gas? Gee, looks like your full of it after all.

"If you put a tiny amount of high-energy fuel (like gasoline) in a small, enclosed space and ignite it, an incredible amount of energy is released in the form of expanding gas."

Now, stop calling names and go learn something.[/quote]How dumb are you? You find one line in a "how stuff works" article and proclaim yourself to be correct? What about every other article I've already posted? How Stuff Works has EXTREMELY laymans descriptions of things. In fact, I'd be willing to bet you didn't link the article because it specifically mentions pressure at some later point.

Show me ANY physical equation that says "expanding gases" cause a force and don't mention pressure.

[TrueSlide]

I HATE YOU ALL!!!!

[sunnys14]

werd up playerz

[skatanic28]

You're a complete moron....you goddamned moronHow retarded are you?Damn, you're an idiot.How dumb are you?

wow man, maybe throw in a few more personal attacks and people will start to see your points. every tech thread ive seen you post in you are a completely condescending *******. not hugged as a child or just need to get laid? drop the attitude and make an attempt to be civil.

[A34D4ME]

I'm directing you to that site because you clearly need to start with some basics. You see, you are throwing out a lot of terms you don't really understand. This is obvious by your failure to mention them in their proper context.

For instance, you keep ranting about how it's pressure and not expanding gas that drives the piston. If you actually understood combustion and the universal gas law, I would not have to explain that heat, pressure and volume have a direct relationship. Go to your encyclopedia and look up Charles' Law and Boyle's Law.

Now here is a quote from the encyclopedia that seems to be the one source of your alleged chemistry background.

"The internal combustion engine is a heat engine in which combustion occurs in a confined space called a combustion chamber. Combustion of a fuel creates high temperature/pressure gases, which are permitted to expand. The expanding gases are used to directly move a piston, turbine blades, rotor(s), or the engine itself thus doing useful work."

You see, it is the reaction of gasoline with oxygen that gives of heat and mostly CO2 which is a gas.

Now pay attention to this part.

Under similar conditions, the products (hot CO2) of this reaction take up far more space than the reactants (gasoline+O2). But the reaction is confined to a small space. When this occurs in a confined space the hot gas that is trying to expand results in pressure. This pressure pushes down the piston. There are two reasons for this pressure. One is because heating a gas causes it to expand (or build pressure when confined). Two, the same group of molecules will (if not confined) take up more space when transformed from a high density liquid to a low desity gas.

You have argued that it is pressure and not expanding gas that cause the piston to move. This is wrong because pressure is a result of expanding gas, which is in part a result of heat. It is not the other way around.

If it is the lowering of the piston that causes expansion of the gases and not visa versa, you would be dealing with perpetual motion. What do you think would happen if this reaction were to proceed in a sealed pipe?

You see, the mistake you are making is that you are confusing cause with effect in your understanding of this reaction.

Bottom line: C8H18 + O2 ----> heat + CO2

Yes, and fortunatly for us, the gases in your cylinder build pressure and force down the piston before being able to fully expand. But it is the result of the gas' attempt to expand that causes pressure.

This error not withstanding, the end result is a volume of hot, gaseous exhaust products that far exceeds the volume of intake air.

You have admited to this when you mentioned, albeit in confusion, that the gas does expand. So, I guess this proves my original point that there is a greater volume of gas exiting the exhaust than there is going into the intake.

Or perhaps you have another convoluted explaination of where all that gasoline goes if not out of your tail pipe in the form of gaseous emissions.

Can I make this any simpler? Anyone?


Modified by A34D4ME at 4:25 PM 12/23/2005

[InsanityInc]

blah blah, I dont' have a brain

Expanding gases do not cause pressure, because you can change pressure without gases expanding.

Say you have a magical lead box that only holds a few molecules and has a spark plug screwed into it. You put 25 molecules of oxygen and two molecules of octane into the box, and the box is now completely full. You can't expand anything because there is no space to expand. Fire the spark plug, what happens? The pressure and heat inside the box go up.

No expansion occured. The pressure raised. Explain that one if expanding gases cause pressure.

Also, gases do NOT occupy more space inherently than solids, they simply diffuse across any space that they are given. For a simple proof that you didn't gain any volume in the reaction:

25O2 + 2C8H18 -> 16CO2 + 18H2O

Let's see:

Products have 50 oxygen molecules, 16 carbon molecules and 36 hydrogen molecules.

Reactants have... 50 oxygen molecules, 16 carbon molecules and 36 hydrogen molecules.

So, unless you're supposing that the reaction somehow violates the law of conservation of mass or magically changes the size of an oxygen atom; No, we do not gain any mass or volume.

Also, the entire idea that gases "expand" is a misnomer and a layman's term used to simplify explanations. Gases have no cohesion. Each molecule of gas is completely separate. Say you have one oxygen molecule whizzing around. Put it in a container and it'll bounce off the walls and stay confined. Open the container and it'll start bouncing around the room. It never expanded. There's nothing to expand. All it did was move from one space to another. However, gases do this with a very high speed which means that they have a lot of kinetic energy. Gas molecules contacting a surface repeatedly with a high velocity is what causes pressure.

Gases don't expand. All they do is move. If that movement is inhibited by a surface, the gas will exert a pressure on the surface based on the velocity of the individual gas molecules.

If that force from pressure causes whatever is containing it to move, THEN the gas molecules will have a larger space in which to move (more volume), which means LESS pressure.

[TrueSlide]

Or perhaps you have another convoluted explaination of where all that gasoline goes if not out of your tail pipe in the form of gaseous emissions.

[A34D4ME]

I ought to have my head examined for wasting my time arguing with this guy.

[S13 240SX]

cheap and easy to do to get to 200hp... NOS!!!!!! it's the best way to get power on the KA if you don't feel like doing internal work or a really high in price turbo setup.

[Bigvinnie]

Well, first off there is a lot more gas coming out of the exhaust because you are burning fuel in the combustion process. Not trying to be a jerk but if you think that the volume of air (gasses) entering your intake are equal to the volume of exhaust gasses you might want to check out "how stuff works.com" This is the chemical basis of the internal combustion engine.

Well to put it bluntly you are right anyways. But you guy's don't have to argue for hours, if we are that confused we can pick up a book.Of course there is more gas coming out of the exhaust burn't or not, and it is denser. Nissan has a tendancy of running ecu tunes richer than leaner in order to keep NOX emissions low, unleaded Octane fuel is much denser than air to begin with (it doesn't take a genius to figure it out). There will be exess fuel that isn't even burnt in the process. Exhaust gasses no matter what is denser.Back pressure is good for streetable cars that want to achieve good gas mileage and pass smog emissions. Without backpressure an EGR assembly would be pointless and serve no function.In the process of adding a high flow CAT I increased my HP, while decreasing my gas mileage. On average I have lost about 1 mile per gallon

[InsanityInc]

Well to put it bluntly you are right anyways. But you guy's don't have to argue for hours, if we are that confused we can pick up a book.Of course there is more gas coming out of the exhaust burn't or not, and it is denser.

There is slightly more material coming out than going in, since you're injecting fuel to the charge. But I said that right up front. About 7%. He seems to think that the gas becoming pressurized raises the CFM requirements of the exhaust.

Quote »Back pressure is good for streetable cars that want to achieve good gas mileage and pass smog emissions. Without backpressure an EGR assembly would be pointless and serve no function.In the process of adding a high flow CAT I increased my HP, while decreasing my gas mileage. On average I have lost about 1 mile per gallon[/quote]Back pressure isn't good for milage, but you do need some for the EGR system to work. In fact, my milage has gone up pretty substantially after adding a 3" exhaust and 3" catalyst.

[A34D4ME]

Well, this might help those of you following this thread who are still willing to learn something. Gasoline does this a lot slower but the principles are the same.

Explosive BasicsThe fundamental concept behind explosives is very simple. At the most basic level, an explosive is just something that burns or decomposes very quickly, producing a lot of heat and gas in a short amount of time.

In the chemical reaction, compounds break down to form various gases. The reactants (the original chemical compounds) have a lot of energy stored up as chemical bonds between different atoms. When the compound molecules break apart, the products (the resulting gases) may use some of this energy to form new bonds, but not all of it. Most of the "leftover" energy takes the form of extreme heat. The concentrated gases are under very high pressure, so they expand rapidly. The heat speeds up the individual gas particles, boosting the pressure even higher. In a high explosive, the gas pressure is strong enough to destroy structures and injure and kill people. If the gas expands faster than the speed of sound, it generates a powerful shock wave. [This is why we need mufflers] The pressure can also push pieces of solid material outward at great speed, causing them to hit people or structures with a lot of force.

When the chemical reaction begins, the C-4 decomposes to release a variety of gases (notably, nitrogen and carbon oxides). The gases initially expand at about 26,400 feet per second (8,050 meters per second), applying a huge amount of force to everything in the surrounding area.

Better to remain silent and be thought a fool than to open your mouth and remove all doubt.

[S13 240SX]

NOS NOS and NOS!!! only way ur gonna see 200 without doing internal work or a high price in turbo setup.