Dual Exhaust

[elsteverino889]

Just wanted to open a discussion on what you guys think about putting a dual exhaust on the yaris...because when you put a new exhaust on our cars its manly for looks bcuz you arent gonna get much new power out of it why keep the single and not get the dual?

[eTiMaGo]

well for one it's going to be very hard to fit the piping... Sedan may be OK, but for the hatchback, it'll be very restrictive.

And without a properly notched rear lip, it's just gonna look weird with two cans hanging out below the bumper. But that's just my opinion :wink:

[AlphaFox]

I will never mess with the stock exaust again.. I did a custom catback on my old car and after 2 years it started to fall apart and I had to reweld stuff. rigth before I traded it in I was sure that it was just about to fall apart... no thanks!

[Nutzoids]

Real duel exhaust on a 4 cylinder?

That mean 2 Cylinders go to one outlet...
and the other 2 Cylinders go to a different outlet...

Seems a bit silly to me, but hey... whatever you’re into!


:evil:

[Dragonacc]

Waste of money IMO. And people will make fun of you for it.

[Chris07LB]

A big dual can setup like the hundreds listed on eBay, just are too big and silly looking for our rear bumpers... now show me a dual outlet, centered under the bumper, and you got something! Something Cooper S ish. :smile:

[Kaotic Lazagna]

the dual look on the Naristo body kit pics are actually decent looking. but on the sedan with a base bumper or S lip, it might look a little off.

[Nutzoids]

A big dual can setup like the hundreds listed on eBay, just are too big and silly looking for our rear bumpers... now show me a dual outlet, centered under the bumper, and you got something! Something Cooper S ish. :smile:

Can I get an AMEN Brother!

But Chino Says it's impossable... :cry:

:evil:

[rwseattle]

I really like the Cooper S exhaust. I 100% agree that all the e-bay and other aftermarket double exhaust system are to large for the Yaris bumper. I wish we could get the Mini exhaust setup for the Yaris.

[Chris07LB]

Can I get an AMEN Brother!

But Chino Says it's impossable... :cry:

:evil:

Its not if you notch your spare tire cavity. :smile:

I know someone who did this to fit an M3 system under their 325 coupe a few years ago. Very professional job, but now a days, its way easier to copy the M3 look for the coupes/sedans.

[YarisGuy]

Waste of money IMO. And people will make fun of you for it.

I agree. There will be no performance gains and it will look silly.

[Nutzoids]

That just seems like too much of a hassle for center pipes... Exhaust is my devil... I can't figure out what to do with it... And it's holding back all my performance upgrades... well that and no one is producing an affordable turbo yet!

:evil:

[Kaotic Lazagna]

there's someone here in Sac that has a black, tricked out Hyundai Accent that has daul outlets in the center. really nice looking and really clean. i want to meet the owner and ask him where and how did he do that exhaust job.

[elsteverino889]

Any exhaust upgrade in the yaris is pretty pointless bcuz u arent gaining anythin...so why not just go for looks completely and make it look sweet with a dual?

[Nutzoids]

Any exhaust upgrade in the yaris is pretty pointless bcuz u arent gaining anythin...so why not just go for looks completely and make it look sweet with a dual?

If you are just mounting a 2nd non working Exhaust pipe... then what ever you want man... Cool...

But if you are planning on actually doing a REAL Duel... I think you will actually loose performance... or at least there will be VERY little Exhaust Pressure... the car will bearly move! And I can't let that happen... You'll give us Yarites a bad Name!


:evil:

[Chris07LB]

Agree. But be mindful, there are members among us you think their Yaris is a race car, ready to take on Vin Diesel. :laugh:

[Chris07LB]

But if you are planning on actually doing a REAL Duel...


No such thing. You wouldnt split the header into two parts (2 cylinders each), to run down into two seperate mufflers. On V8's for example, this is done, but just before the mufflers is either an X pipe or H pipe. On a V engine you have two seperate headers, two banks of cylinders... this wouldnt apply to our lil sewing machines. :thumbsup:

[ChinoCharles]

What Chris said.

A dual exhaust on a 4 cylinder car screams "I know nothing about cars."

[Black Yaris]

What do ya think Chino, knock up the spare holder and relocate the charcoal box to make room for the center mount exaust?

[ChinoCharles]

Souds like a lot of work that I have no experience with.

I still want a center mount desperately though. I might just have to make Kevin cry for that one. I'll be the guy with the $800 exhaust on his Yaris. :rolleyes:

[Black Yaris]

Souds like a lot of work that I have no experience with.

I still want a center mount desperately though. I might just have to make Kevin cry for that one. I'll be the guy with the $800 exhaust on his Yaris. :rolleyes:

and I will be the guy with the guy with the same exhaust for $350 :tongue:
when you are ready Lets make an apointment, get you here the night b4, drop your car off in the mornin, and let them have there way with it, I know you ain't payin more than $400 TOPS to do the same thing your buddy is doing at TI, in stainless... 2.25in madril bends

[Spades]

Bad idea.

If you went true dual exhaust and had a header custom made to 4-2 split, you would have to figure out how to trick the O2 sensors into thinking that your two pipes are actually one pipe, which means you would be messing with the computer....bad idea, and would most likely hurt performance. Contrary to what most people think, to run effectively and still gain HP, you need SOME back pressure, and true dual exhaust would not provide any back pressure.

If you are going for looks, then go for it, but be prepared to loose more HP than what you have just stock. Spliting the exhaust does the same thing as going from 2" piping down to 1" piping then back up to a 2" muffler...it hurts exhaust velocity.

There is more to exhaust performance than just back pressure, back pressure is a big facter, but exhaust velocity plays a big factor as well. When you split the flow or change tubing sizes, it slows the exhausts escape from the header. It creates a bottle neck effect, slowing the exhausts escape. What this means is, the more you split the flow or go from big to small then back again, the slower the exhaust, the less the performance.

While the dual exhaust makes more back pressure, that can be remedied by larger pipe from the cat back...however, there is no way to fix the velocity issue. So, in what I have seen from dyno results, expect a few HP decrease from stock after you put on the dual exhaust.

If you want performance and looks, mount another muffler to it, and run the tubing back, just dont hook up the tubing to the primary exhaust. No one will ever know, and even when you tie the dual exhausts together, the exhaust always finds the easy way out, and normally goes through only one of the mufflers anyway, so on cold days even when they are tied you will see only one pipe blowing smoke as it is, so why not do the fake dual exhaust.

P.S. In my humble opinion, duals on 4cyl's make me laugh...dual only looks cool on muscle cars and other V powered machines. Sounds like sh-t and is pointless on inline cars.

[brickhardmeat]

possible to just put the exhaust under the passenger side door? not that i want to

[Spades]

Side dump exhaust? As tested in car and driver that had the best performance increase and the best back pressure and exhaust velocity of several set ups that they tested.

Be prepared for lots of noise violation tickets though!

Back on track for the thread...dual exhaust...looks cool to some, hurts performance...even over stock exhaust...

[Black Yaris]

http://i22.photobucket.com/albums/b320/echo_hrs2/Echo/4.jpg


I think it is sharp, clean, not to over the top :thumbsup:

[ChinoCharles]

That is a nice dual setup.

A dual exhaust in some cases also says "I don't give a damn what this does for me... the ladies love it."

[brickhardmeat]

it looks nice and balanced but non-functional, oh well, whatever

[punch]

Bad idea.


P.S. In my humble opinion, duals on 4cyl's make me laugh...dual only looks cool on muscle cars and other V powered machines. Sounds like sh-t and is pointless on inline cars.
I kinds think this set-up looks good...

[eTiMaGo]

I think the original idea is to have a second pipe branch out at the back of the car, or a shared muffler or something, not a full twin pipe all the way to the header... That would be pretty pointless... Although it may give a bit of a subaru-ish rumble as the exhaust alternates between left and right?

Or you can do what I've seen on so many M5 wannabe 5 series here, just have the exhaust tip welded onto a bracket attached to the bumper. :biggrin:

As for dual exhausts being stupid on 4-cylinder cars, Mercedes Benz is happy enough to do it with their 1.8 liter SLK200s... OK, sure, they're supercharged, but it's all about the pimpin' style...

[Chris07LB]

We were talking about how on a 4cylinder, you wouldnt split the single header into two, and run a muffler for each pair (two) of cylinders.

Nothing wrong with bringing the piping straight back as is now, and dumping into a dual muffler, no matter how it splits... center together in bumper... offset on each side of bumper... etc.

[elsteverino889]

Then would a dual exhaust system work effectively on a turbo charged yaris?

[punch]

Then would a dual exhaust system work effectively on a turbo charged yaris?

if you have 2 turbos, then yes it would.

[Doc Zaius]

Contrary to what most people think, to run effectively and still gain HP, you need SOME back pressure, and true dual exhaust would not provide any back pressure.

.....

While the dual exhaust makes more back pressure, that can be remedied by larger pipe from the cat back...

I'm confused... or did I understand this incorrectly?

[Black Yaris]

I think some ppl need more drugs before they start posting on subjects they think they know about

[Chris07LB]

You just noticed that now? :rolleyes:

[elsteverino889]

I think some ppl need more drugs before they start posting on subjects they think they know about

hope u arent talkin about me bcuz i posted it bcuz i truelly didnt know, alright thanks pops

[Doc Zaius]

hope u arent talkin about me bcuz i posted it bcuz i truelly didnt know, alright thanks pops

he wasn't, buddy... don't worry!

[Black Yaris]

You just noticed that now? :rolleyes:

nope... just bringing it to everyone elses attention

[Doc Zaius]

On the subject of backpressure, here's a real interesting link that I found while digging around on the 'net during ChinoCharles' Megan header dyno stuff. Explains why a less restrictive header/exhaust component seems to decrease lower-RPM power. Guess what?? Its NOT backpressure!! :tongue:

Exhaust: The straight scoop on backpressure (http://www.dsmtuners.com/forums/showthread.php?t=168578) <-- awesome! must read!
Exhaust system backpressure (http://www.mustangforums.com/archive/threads/exhaust-system-backpressure-9765-1.html) <-- another good one.

:thumbsup:

[Yaris Revenge]

I say slap 4 independent pipes on that sucker! A separate header for each cylinder! With 4 giant cans hangin' out the back! Hell yeah! :laugh:

~YR

[Black Yaris]

I say slap 4 independent pipes on that sucker! A separate header for each cylinder! With 4 giant cans hangin' out the back! Hell yeah! :laugh:

~YR

Why not it would match perfect with Chino's ITB idea he has been lookin into

[ChinoCharles]

On the subject of backpressure, here's a real interesting link that I found while digging around on the 'net during ChinoCharles' Megan header dyno stuff. Explains why a less restrictive header/exhaust component seems to decrease lower-RPM power. Guess what?? Its NOT backpressure!! :tongue:

Exhaust: The straight scoop on backpressure (http://www.dsmtuners.com/forums/showthread.php?t=168578) <-- awesome! must read!
Exhaust system backpressure (http://www.mustangforums.com/archive/threads/exhaust-system-backpressure-9765-1.html) <-- another good one.

:thumbsup:

At the end of the "must read" he says...

"So the loss in torque has nothing to do with backpressure and everything to do with gas velocity."

That statement made me laugh. Gas pressure and gas velocity are codependent. Although he does a great job explaining scavenging, I'd take it with a grain of salt. He left out the simple high school physics. :laugh: It is still a good read though. I just don't think its all scavenging, just like I don't think its all backpressure. It is a combination of these and many more factors that determines the efficiency of an exhaust system.

[Black Yaris]

At the end of the "must read" he says...

"So the loss in torque has nothing to do with backpressure and everything to do with gas velocity."

That statement made me laugh. Gas pressure and gas velocity are codependent. Although he does a great job explaining scavenging, I'd take it with a grain of salt. He left out the simple high school physics. :laugh: It is still a good read though. I just don't think its all scavenging, just like I don't think its all backpressure. It is a combination of these and many more factors that determines the efficiency of an exhaust system.

I will would love to see a set of zoomies set up with your ITB idea

[eTiMaGo]

but instead of having the pipes exit at the back, split them, two a side, right behind the front wheels. Then screw up your fuel map to make it extra rich, and spit FIRE! :biggrin:

[Black Yaris]

A fire breathing Egg!!
someone PLEASE photoshop that!!

[eTiMaGo]

while searching for pictures of flaming exhausts I found this abomination... exhaust spinner. I'm gonna have to jump off a tall building now, nice knowing you guys...

[Black Yaris]

Ridin Spinna's

[Nimble]

rice rice baby....ding ding ding da da ding ding...vanilla...rice rice baby

[Nutzoids]

rice rice baby....ding ding ding da da ding ding...vanilla...rice rice baby

Word to your Mother!

:evil:

[Chris07LB]

rice rice baby....ding ding ding da da ding ding...vanilla...rice rice baby

"Alright STOP!....Calobrate and LISTEN...."

[Nutzoids]

<object width="425" height="350"><param name="movie" value="http://www.youtube.com/v/MxN_pbMOFk0"></param><param name="wmode" value="transparent"></param><embed src="http://www.youtube.com/v/MxN_pbMOFk0" type="application/x-shockwave-flash" wmode="transparent" width="425" height="350"></embed></object>

I love it!

:evil:

[Nutzoids]

<object width="425" height="350"><param name="movie" value="http://www.youtube.com/v/MxN_pbMOFk0"></param><param name="wmode" value="transparent"></param><embed src="http://www.youtube.com/v/MxN_pbMOFk0" type="application/x-shockwave-flash" wmode="transparent" width="425" height="350"></embed></object>

http://www.youtube.com/watch?v=MxN_pbMOFk0

I love it!

:evil:

Edit: Booo... it didn't work... Damn yous Youtube... DAMN YOUS!

[Chris07LB]

Yo, VIP, let's KICK IT! :headbang:

Ah, to be in middle school again...

[Nutzoids]

Yo, VIP, let's KICK IT! :headbang:

Ah, to be in middle school again...

Would you be Rollin' in your 5.0
With your rag-top down so your hair can blow
The girlies on standby waving just to say hi

:evil:

[Nimble]

What have I started? :biggrin: :iono: :cry:

Chris, that pic is regoshdarndiculously hilarious!!! :clap: :bellyroll:

[Yaris Revenge]

Is Vanilla sportin' a woody in that pic or what???

Looks frighteningly similar to Max Headroom there...

~YR

[elsteverino889]

Dual exhaust FTW!

[Nimble]

incorrect. ftl.

[Spades]

Ok, backpressure and exhaust velocity both add to decreased HP...they both affect eachother but are indipendant. Back pressure is how much restriction there is in the pipes, it measures how much it takes to get the exhaust through the tubes. Exhaust Velocity is how fast the gasses move through the tubes.

While low back pressure is good for horse power, there needs to be a little bit there or most of the computers in newer vehichles do not adjust properly to the changes in pressure.

Exhaust velocity is what is affected most by splitting the exhaust. you can get 4" piping all the way back to the mufflers and 4" mufflers, and you will have no back pressure, but on the other hand, because you split the exhaust flow your exhaust velocity goes down.

It has been proven on the dyno...single vs dual exhaust on 4cyl cars...single wins every time.

If you want dual exhaust, more power to you! Just keep in mind you are sacrificing performance for style.

Yes steve, dual exhaust will work with a turbo...heck, it will work with anything...But with a turbo you would notice even more power gains with a single exhaust set up.

P.S. maybe I do need more drugs so it will help me when I try to explain stuff that I only think I know about.

[Sabretooth]

FlameYaris...why photoshop when theres youtube...


http://youtube.com/watch?v=2HxvS8knQJs

[heylookitsjames]

It seems to me that due to laminar flow, two smaller pipes with the same cross sectional area as one larger pipe would infact have higher gas velocity (this can be seen when solving the Reynold's Number equation for mean velocity and using an Re of 2300 it can be seen that L, or "characteristic Length"... in this case, the diatmeter of the pipe, will result in an smaller laminar flow value). Also, if they were fused/jointed correctly, they could be as uinrestrictive as well. In addition, scavenging effect (effectively having a wave of low pressure interlope its way back into the combustion chamber that aides the successive induction charge) is more pronounced on smaller diameter pipes...

/This being said, I think that twin exhaust would look kinda dirty...

[Black Yaris]

whatever happen to that photoshop of some zoomies coming out the wheel wells with flames coming out?

[Doc Zaius]

It seems to me that due to laminar flow, two smaller pipes with the same cross sectional area as one larger pipe would infact have higher gas velocity (this can be seen when solving the Reynold's Number equation for mean velocity and using an Re of 2300 it can be seen that L, or "characteristic Length"... in this case, the diatmeter of the pipe, will result in an smaller laminar flow value). Also, if they were fused/jointed correctly, they could be as uinrestrictive as well. In addition, scavenging effect (effectively having a wave of low pressure interlope its way back into the combustion chamber that aides the successive induction charge) is more pronounced on smaller diameter pipes...

Holy hell! Fluid mechanics? Must be an engineer! :biggrin:

[sf180th]

It seems to me that due to laminar flow, two smaller pipes with the same cross sectional area as one larger pipe would infact have higher gas velocity (this can be seen when solving the Reynold's Number equation for mean velocity and using an Re of 2300 it can be seen that L, or "characteristic Length"... in this case, the diatmeter of the pipe, will result in an smaller laminar flow value). Also, if they were fused/jointed correctly, they could be as uinrestrictive as well. In addition, scavenging effect (effectively having a wave of low pressure interlope its way back into the combustion chamber that aides the successive induction charge) is more pronounced on smaller diameter pipes...

/This being said, I think that twin exhaust would look kinda dirty...

:bow: :bow: :bow: :confused: :bow: :bow:

[Spades]

hrm...two pipes may be more efficient at expelling gasses than one larger single pipe...however, maybe I am way off...but doesn't splitting the flow hurt exhaust velocity? If it does not, I formally apoligise to anyone I may have misled.

[heylookitsjames]

hrm...two pipes may be more efficient at expelling gasses than one larger single pipe...however, maybe I am way off...but doesn't splitting the flow hurt exhaust velocity? If it does not, I formally apoligise to anyone I may have misled.

No... you are actually probably correct... hence my "Also, if they were fused/jointed correctly" statement...

The real trick would be point of fusion between the two pipes, this is for sure.

[elsteverino889]

That video was weird, kinda freaked me out

[eTiMaGo]

Just tried this in photoshop out of curiosity, it could actually look pretty decent in person... Piping would be difficult indeed, but if you went so far as to remove the bump of the spare wheel, that would give a lot of space...

Something to think about... :smoking:

[Black Yaris]

nice

[ChinoCharles]

It would look sick on this car.

James, what you're saying is two pipes with a 1.125" diameter would perform better than a 2.25" exhaust with a single pipe? Dare you to try it. :laugh:

[elsteverino889]

That does look nice etimago but let say a boosted yaris and wanted a dual exhaust would it be better than a single or dual exhaust upgrade

[eTiMaGo]

Well I'm not thinking of running two pipes off the engine, just the standard single one, but splitting it in two at the axleback level. Although, what I think would be an ultimate setup is to have one performance-oriented, noisy exhaust on one side, and a quiet one on the other, and switching between the two with some kind of butterfly valve at the junction :biggrin: I think Porsches and other high performance cars use an automated setup similar to this to pass noise regulations...

But anyway this is just a silly concept at the moment!

[hasher22]

FlameYaris...why photoshop when theres youtube...


http://youtube.com/watch?v=2HxvS8knQJs

wow that looks and sounds shit...haha major fart can

[Sabretooth]

Actually Looks good, as for my vid I Posted, yea...

Flamethrowers on a Yaris, the ultimate Riceburner

[Blenjar]

hahah nice one..rice burner..

-- Blen