MonStar

I know, check out the link that I posted.

Thats what I mean when I say dual exhaust on the same side, as a substitute for a split dual exhaust. I really like the dual exhaust on the same side actually.

Bl@ck

there's one main reason that they don't make dual exhaust setup for the I4. there is only one exhaust manifold on the I4. dual exhaust on an I4 looks pretty homo IMHO.

the reason that the AV6 and the 3.2TL-S have dual exhaust is because they are V6 engines and therefore have 2 seperate exhaust manifolds.

IMO duals on an I4 are a detriment to both performance and looks. IMO it's not just uncle ben's, it's uncle ben's minute rice.

MonStar

Okay, back to what I am talking about.

I was considering the spilt exhaust like on the Acura 3.2s, NOT NOW.

Now I am looking at the dual exhaust muffler, its only on one side. What do you guys think about that? Good, bad, or what?

decibel_dj

:werd: thats true its all noise and thats it

:bsflag: u need to check again theres only 1 exhaust manifold on a V6 thats why alot of domestic laugh at dual exhaust V6's on V8's, V12's and so on there are two. if u notice on a V6 car theres only "1" header. the idea behind the dual exhaust on V6's are for emissions restrictions and noise levels

skabone69

Trog-dor, hells yeah. Strong bad is my hero...Trog-dor!!!:rockon:
I asked the guy that did my custom setup and he said their would not be a loss of performance, minimal if any. I might get flamed for having it, but I still like my dual exhaust setup.:grinpimp:

decibel_dj

theres a loss but in order to keep a close to stock reading the piping would be about the size of the stock piping or a tad smaller if u go larger u'd get a louder sound but a larger decrease in power

AadosX

Ok first of all there isn't two exhaust manifolds on most V6's, its simply a muffler mounted around the rear axle, then two tips coming out of that muffler. At first I am assuming that this is what MonStar wanted. But now what you want, is not dual exhaust at all, in fact what I mentioned before, with the one muffler around the rear axle, is not dual exhaust either, true dual exhaust comes from each side of the engine, one pipe to each header. NOW, what you are looking for, from what I see here, is just a muffler with two openings, side by side... am I correct?

Prowler

This should answer all backpressure questions. From Hondagallery.com forums (my board)

One of the most misunderstood concepts in exhaust theory is backpressure. People love to talk about backpressure on message boards with no real understanding of what it is and what it's consequences are. I'm sure many of you have heard or read the phrase "Hondas need backpressure" when discussing exhaust upgrades. That phrase is in fact completely inaccurate and a wholly misguided notion.

II. Some basic exhaust theory

Your exhaust system is designed to evacuate gases from the combustion chamber quickly and efficently. Exhaust gases are not produced in a smooth stream; exhaust gases originate in pulses. A 4 cylinder motor will have 4 distinct pulses per complete engine cycle, a 6 cylinder has 6 pules and so on. The more pulses that are produced, the more continuous the exhaust flow. Backpressure can be loosely defined as the resistance to positive flow - in this case, the resistance to positive flow of the exhaust stream.

III. Backpressure and velocity

Some people operate under the misguided notion that wider pipes are more effective at clearing the combustion chamber than narrower pipes. It's not hard to see how this misconception is appealing - wider pipes have the capability to flow more than narrower pipes. So if they have the ability to flow more, why isn't "wider is better" a good rule of thumb for exhaust upgrading? In a word - VELOCITY. I'm sure that all of you have at one time used a garden hose w/o a spray nozzle on it. If you let the water just run unrestricted out of the house it flows at a rather slow rate. However, if you take your finger and cover part of the opening, the water will flow out at a much much faster rate.

The astute exhaust designer knows that you must balance flow capacity with velocity. You want the exhaust gases to exit the chamber and speed along at the highest velocity possible - you want a FAST exhaust stream. If you have two exhaust pulses of equal volume, one in a 2" pipe and one in a 3" pipe, the pulse in the 2" pipe will be traveling considerably FASTER than the pulse in the 3" pipe. While it is true that the narrower the pipe, the higher the velocity of the exiting gases, you want make sure the pipe is wide enough so that there is as little backpressure as possible while maintaining suitable exhaust gas velocity. Backpressure in it's most extreme form can lead to reversion of the exhaust stream - that is to say the exhaust flows backwards, which is not good. The trick is to have a pipe that that is as narrow as possible while having as close to zero backpressure as possible at the RPM range you want your power band to be located at. Exhaust pipe diameters are best suited to a particular RPM range. A smaller pipe diameter will produce higher exhaust velocities at a lower RPM but create unacceptably high amounts of backpressure at high rpm. Thus if your powerband is located 2-3000 RPM you'd want a narrower pipe than if your powerband is located at 8-9000RPM.

Many engineers try to work around the RPM specific nature of pipe diameters by using setups that are capable of creating a similar effect as a change in pipe diameter on the fly. The most advanced is Ferrari's which consists of two exhaust paths after the header - at low RPM only one path is open to maintain exhaust velocity, but as RPM climbs and exhaust volume increases, the second path is opened to curb backpressure - since there is greater exhaust volume there is no loss in flow velocity. BMW and Nissan use a simpler and less effective method - there is a single exhaust path to the muffler; the muffler has two paths; one path is closed at low RPM but both are open at high RPM.

IV. So how did this myth come to be?

I often wonder how the myth "Hondas need backpressure" came to be. Mostly I believe it is a misunderstanding of what is going on with the exhaust stream as pipe diameters change. For instance, someone with a civic decides he's going to uprade his exhaust with a 3" diameter piping. Once it's installed the owner notices that he seems to have lost a good bit of power throughout the powerband. He makes the connections in the following manner: "My wider exhaust eliminated all backpressure but I lost power, therefore the motor must need some backpressure in order to make power." What he did not realize is that he killed off all his flow velocity by using such a ridiculously wide pipe. It would have been possible for him to achieve close to zero backpressure with a much narrower pipe - in that way he would not have lost all his flow velocity.

V. So why is exhaust velocity so important?

The faster an exhaust pulse moves, the better it can scavenge out all of the spent gasses during valve overlap. The guiding principles of exhaust pulse scavenging are a bit beyond the scope of this doc but the general idea is a fast moving pulse creates a low pressure area behind it. This low pressure area acts as a vacuum and draws along the air behind it. A similar example would be a vehicle traveling at a high rate of speed on a dusty road. There is a low pressure area immediately behind the moving vehicle - dust particles get sucked into this low pressure area causing it to collect on the back of the vehicle. This effect is most noticeable on vans and hatchbacks which tend to create large trailing low pressure areas - giving rise to the numerous "wash me please" messages written in the thickly collected dust on the rear door(s).

VI. Conclusion.

SO it turns out that Hondas don't need backpressure, they need as high a flow velocity as possible with as little backpressure as possible.

legendarith

I was only charged 125 to do the dual exhaust piping, but I already had my mufflers. There is no huge difference in performance. For cars with smaller engines, it's just mainly for looks. You might be able to experience a bit more performance on the high end. If you have the money to waste and you are going for looks, then go ahead and do it. If you don't have money to waste, then save up your money and purchase something more profitable like an HID kit. If you can get a hold of tl owners who aren't using their oem mufflers with chrome tips and you can get the mufflers from them, then do it!

Bl@ck

:wtf:ok... it's apparent that you are full of :bs:

according to the helms and haynes manuals there is a front and rear exhaust manifold. a V6 engine has 3 cylinders on each side of it. the cylinders are staggered so that the iniertia of the spinning crank is not lost between power strokes.

it would be aesthetically retarded to have only one exhaust manifold on a v6 engine. for starters it would be way too big since the 3 exhaust ports for each side of the "V" are on opposite sides of the engine.

skool ez fuun:thinking: :screwy: