wow arctic..you are still a close minded dick!! and ive been on this site for a while now....also my exhaust looks NOTHING like that....and i do not have too much flow......oh wait....were you there talking to the engineer having him show you how he designed it with some backpressure so that the I4 could gain some torque and hp and how the muffler does NOT have a straight through design so that the air flow is kept at a constant throughout the entire exhaust? I didnt see you there...hmm...well maybe the engineer with the degree and experience and his own company doesnt know what he's talking about?

did you think i still had the evo fusion exhaust that looks like the pic you posted? well i dont ......way to pay attention to what was posted

tool.gif

 

dosent the stroke make a big difference in the way cars sound, I remember reading that somewhere, like the diff between a mucle car and a honda

 

<div class='quotetop'>QUOTE (Malik112099 @ Aug 23 2005, 06:57 PM)</div><div class='quotemain'>wow arctic..you are still a close minded dick!! and ive been on this site for a while now....also my exhaust looks NOTHING like that....and i do not have too much flow......oh wait....were you there talking to the engineer having him show you how he designed it with some backpressure so that the I4 could gain some torque and hp and how the muffler does NOT have a straight through design so that the air flow is kept at a constant throughout the entire exhaust? I didnt see you there...hmm...well maybe the engineer with the degree and experience and his own company doesnt know what he's talking about?

did you think i still had the evo fusion exhaust that looks like the pic you posted? well i dont ......way to pay attention to what was posted</div>

No. But your asinine comments on NT and the whole SR fiasco just proved how much of a whining lil b!tch that won't do anything.

Anyone with $5k can get certified for welding. And anyone who knows how to make a basic muffler can claim their design is superior. But often, you usually end up paying for a reputable company that is known to research their products and testing them (such as AEM and their CAIs, whereas everyone else on eBay copies their design).



And CLEARLY you people have NO idea what you're talking about when you guys say that "you need to have/keep backpressure for N/A'd cars":

Miata.Net - Know Your Car

For those who are erroneously assuming this fallacy, let me direct you to the pertinent part of the write-up:

<div class='quotetop'>QUOTE </div><div class='quotemain'>It is easy to see how this misunderstanding arises. Lets’ say that Max puts a 3-inch system on his normally aspirated car. He soon realises that he has lost power right through the power band. The connection is made in his throbbing brain…. put on 3" pipe = loss of backpressure = loss of power. Max erroneously concludes that you need backpressure to retain performance. He has ignored the need for exhaust gas velocity to get that scavenge effect.

If Max had chosen a 2 1/4" pipe he would have achieved better performance in the mid- to high-RPM power band. You need the combination of the least positive (close to zero) backpressure possible with the highest gas velocity achievable to create performance. The diameter of the pipe (and smoothness of internal finish and bends) will strongly influence if your exhaust change is going to create performance or lose power.</div>

What does that mean? Means that you want the LOW backpressure, but HIGH flow...not HIGH backpressure and LOW flow (aka your standard bumble-bee fart cans that use the "resonator tip" inserts).

I know...most of you are probably going to be like, "WTF? That's from a Miata site though...they're wrong." Go do a Google search, instead of regurgitating what so-and-so said on a thread about how you want more exhaust.

Yeah...this has nothing to do with the BSE 2.0 exhaust. But it's getting annoying when people are spewing false information to other people, and other people learn it and spread it like Hep C in an all-male prison.

 

low back pressure and high velocity makes sense.

by the way, hepatitis C is carried through blood only, not semen.

 

hmm......so you deny the tuning capabilities of BSE? why dont you do a search for Bill Smulo or CLIMAX and come back to me wrong....


as for the backpressure...according to your remarks, no back pressure is worse than a little right? therefore the 2" piping and NOT-straight through mufflers will cause the exhaust to have a little backpressure, which will keep the air moving at a constant state and keep it hot, which will cause it to disperse at a faster rate (as oppossed to cold air which totally f***s up the exhaust flow).....so by what you posted, my exhaust was properly engineered.....thank you for proving that...


also......AEM didnt start out as being reputable, every company has to start from the bottom up, so to say a new company without many product sold yet is not reputable is a severely uneducated, idiotic statement to make....


if high flow and low backpressure are so damn good, how come performance exhausts dont dump out right after the cats? you need some pressure and piping to keep flow constant and the air hot....


dont spew hepatitis C from your pie hole based on one site you read for a few minutes, maybe you should go to wyotech or some other engine related school and brush up on what you dont know about

 

<div class='quotetop'>QUOTE (Malik112099 @ Aug 23 2005, 11:51 PM)</div><div class='quotemain'>as for the backpressure...according to your remarks, no back pressure is worse than a little right? therefore the 2" piping and NOT-straight through mufflers will cause the exhaust to have a little backpressure, which will keep the air moving at a constant state and keep it hot, which will cause it to disperse at a faster rate (as oppossed to cold air which totally f***s up the exhaust flow).....so by what you posted, my exhaust was properly engineered.....thank you for proving that...</div>

No. No backpressure is NOT worse than little backpressure. You want LOW. So no backpressure would be ideal. As for not-straight through...no. You're decreasing gas escape velocity...so I in fact did not prove you right at all.

<div class='quotetop'>QUOTE </div><div class='quotemain'>if high flow and low backpressure are so damn good, how come performance exhausts dont dump out right after the cats? you need some pressure and piping to keep flow constant and the air hot....</div>

I have no idea where you're spewing that information out from. Keep the air hot after the cats? If that was the case, then why are we using METAL tubing for our exhaust? Metal...which has high thermal conductivity, means we want the heat to dissipate faster. Otherwise, we'd be using a high-temp plastic as our exhaust tubing, which has low thermal conductivity, keep your so-called air "hot".

And what are you talking about? Performance exhausts don't dump out right after the cats? Yes they do. Unless you have a cat-less exhaust setup, which would be highly illegal, horrible for the environment, and a factor that creates the "buzzing" rice sound...then your exhaust dumps out right after the cat. Unless you're referring to why we don't just dump the exhaust gases immediately after the catalytic...which would only because of sound (dB) levels that are required by law (most states, you NEED a muffler).

<div class='quotetop'>QUOTE </div><div class='quotemain'>dont spew hepatitis C from your pie hole based on one site you read for a few minutes, maybe you should go to wyotech or some other engine related school and brush up on what you dont know about</div>

Hep B, not C. And maybe you should take a course in Fluid Mechanics to understand flow and pressure.

 

if no backpressure is ideal, why dont race cars run open heads? how is it that no backpressure is ideal, but equal length headers make more power than shorter headers? you are making no sense and continuing to make an ass of yourself .... you want NO back pressure with high escape velocity..this is basically impossible unless you run open heads ..... other wise you could go with a 3 inch exhaust all the way out the back of the car, but then the escape velocity would be shit because the air wouldnt have a nice flow.....exhaust gasses are not flowing at a constant .... the exhaust comes out in pulses..you need slight backpressure to keep the pulses traveling at a somewhat constant pace without them becoming spurious and disrupting flow.......try this...... cut the bottom off a 2 liter coke bottle and start blowing puffs of air out of it at a constant high rate of speed......put your hand on the end of it and feel it come out the other end.....the bottle opening acts as the headers which are the same basic size of your head exhaust port...the bottle itself is you no pressure exhaust .. guess what...you dont feel much cause you flow sucks..the spurious air is entering the big bottle with no back pressure and is spinning air and bouncing off of its self and the bottle ... now get a water hose and cut it the length of the 2 liter bottle and do the same puffs....guess what? you feel the air constantly coming out at an even pace ... less room = the air has no choice but to travel down the hose and escape......the air not being able to freely escape DOES cause some backpressure which is actually good cause it keeps the air flowing in one constant direction....but if you make the exhaust too restrictive the engine cant exhale and that is a bad thing.....

 

But running open heads it would decrease the velocity a lot, I think what AC is saying makes sense..

 

open heads means that your exhaust is dispelled IMMEDIATLY, that is about the fastest you can get the escape velocity while achieving zero backpressure

 

<div class='quotetop'>QUOTE </div><div class='quotemain'>if no backpressure is ideal, why dont race cars run open heads? how is it that no backpressure is ideal, but equal length headers make more power than shorter headers? you are making no sense and continuing to make an ass of yourself .... you want NO back pressure with high escape velocity..this is basically impossible unless you run open heads</div>

You're an idiot. Do you even know WTF backpressure is? WTF?

Backpressure (in automotive terminology) is a term used for an enclosed system, such as a pipe or an exhaust system. Specifically, it's the opposing pressure for free flowing exhaust gas within that system. So when someone says "no backpressure", it refers to the positive opposing pressure within the exhaust system.

And if we were still talking about your "high performance racing cars", dragsters often do run individual pipes from each exhaust port, with no collection, straight to the atmosphere. This being the top-fuel dragsters, funny cars, etc. The only reason for the pipes is strictly for aerodynamics (to prevent the turbulent air spewing from the exhaust ports to collide with a laminar air flow path). So yes, they do have cars that run open heads.

But why don't we see many cars do that? Why collectors and headers on high-end performance sports cars? Umm...strictly for production and emission regulations.

<div class='quotetop'>QUOTE </div><div class='quotemain'>the exhaust comes out in pulses..you need slight backpressure to keep the pulses traveling at a somewhat constant pace without them becoming spurious and disrupting flow</div>

Great job at regurgitating what the link I posted said about exhaust pulses.

<div class='quotetop'>QUOTE </div><div class='quotemain'>The spurious air is entering the big bottle with no back pressure and is spinning air and bouncing off of its self and the bottle</div>

Spurious means "false"...which you used incorrectly in that sentence. haha.gif

<div class='quotetop'>QUOTE </div><div class='quotemain'>the bottle itself is you no pressure exhaust .. guess what...you dont feel much cause you flow sucks</div>

Now...that was referring to your 2 liter bottle, cut the fat end off, and blow. I really wish you'd serious learn some fluid mechanics. FLOW IS CONSTANT!!! Please drill that into your frigging head. Bernoulli's flow equation is the following:

Q = (V1 * A1) = (V2 * A2)

Where Q = flow, V = velocity, and A = cross-sectional area. What does this mean? It means FLOW is CONSTANT, and only the variables of velocity/area change accordingly. Meaning...when you give head to the bottle, you have a specific velocity you're blowing at through the small area of the bottleneck. Now...what happens at the wide end? Area increases, velocity decreases accordingly. That's why if you were to put your hand at the end of it, it doesn't feel like there's anything blowing.

And what is the Bernoulli Effect? It's the REDUCTION in positive pressure (in our case, backpressure) when you increase the fluid's velocity. Meaning? Reduction in backpressure when you increase velocity. Now, where have we heard this before? Oh...it just so happens one of the links I posted above made the indication of this.

But oh...I must be wrong. I mean...those classes in Fluid Mechanics and Physics were all BS. Even that Miata site, which basically confirmed the principles of Bernoulli's equation and effect, was wrong too. In fact...Jacob Bernoulli was wrong all along. eyeroll.gif