Duel Exhaust

[Clipz99]

I have a question, have you guys every thought about putting on a duel exhaust system while keeping the OEM back bumper. All you would have to do is cut a hole to match the one already on the left side right? I was just wondering if anyone has tried that and if they had a pic to post. I’m trying to keep my eclipse OEM style and just thought this would be something kind of original.
I hate to bring up the "best muffler" question again, but if I were to do the duel exhaust, what would be a good system to put on it?
Thanks for your help

 

[JoeZ]

Originally posted by Clipz99
Duel Exhaust

"Fight!" "Finish Him!"


I've seen a dsm with duAl exhaust....had that wide body kit on it...I think it's spelled quwheels...

 

[sjwelna]

, I don't think you want your exaust duEling....

I've seen a couple DSM's w/ dual exaust, or at least one real exaust, and one fake muffler just bolted up into place.

Seeing as this is in the "Non-performance" forum, I'll just assume that you know having dual exaust doesn't give you any extra advantage, and this will be just for looks. Dual exaust actually can hinder you (marginally) because of the extra weight from the useless pipes.

I guess "if" I were going to put "dual" exaust on a DSM, I would probably just put some kind of dual N1 mufflers on.

(If you're wondering why dual exaust doesn't give you any advantage, think of it this way: the exaust header already collected everything down into one pipe, why split it up again? There aren't two exaust headers that would necesitate having two separate exaust routes.)

 

[JoeZ]

That's not entirely true...but I don't want to get into a war over it.

The performance gain would be marginal at best, and it definately would be more for asthetics than performance (thus the reason you posted in this forum, I assume).

Try finding audio clips of different exhausts or check out what other people have. Think of the sound they will give when dualed as being a half-throttle sound but kinda louder, if you know what I mean...

 

[9D9 MITSU RS]

S2000 has 1 header and it comes stock with duals.

 

[Morphius]

I currently have duals out the back on my 91 TSI FWD. I used a tri-flow muffler from a GM f-body. 3rd gen, Works just great. No performance gain, but it has a nice tone and looks cool.

I'd get a pic for you but the car is backed in my storage unit. It's apart for a motor change so I can't pull the car out. I'll dig around and see if I can mange to find a pic of it. If not, as soon as I'm done with the motor install I'll post them.

-DaimlerChrysler Engineer

 

[stock1g4g63]

I think the reason for the dual exhaust on the s2000 is similar to the dual exhaust on the camaro's: merely for effect. The Mustang's have true dual exhaust while Camaro's, 2nd gen RX-7's, and S2000's have like a "Y" pipe. Probably why Mustang's (GT's and up) sound so much better than Camaro's. But then again, the scream of a BOV can spank any exhaust any day in my book

 

[RipperXX]

BOV? Do you mean wastegate? becouse a BOV shouldn't be screaming unless it's leaking...

 

[stock1g4g63]

The "screaming" was a figure of speech... :laugh: since my BOV sound's like a high-pitched scream every time I blow off, and I was saying that I'd rather take a car with a silent exhaust tone but an intimidating BOV than even the meanest sounding exhaust.

 

[MyEclipse5]

Design a new headr that comes off into two different pipes, it would be wierd but effective, maybe

 

[Laser93Nash]

Maybe. But where would you run 2 exhaust pipes under the car? There isn't enough room. My friend has duel exhaust on his Civic. What the mechanic did is he put a muffler on before the pipe went over the rear axle. Then Y'd it off and ran anther pipe to the onther side of the car. And he just put tips on em. Thats the only way I could think about doing it for a 4 cyl. Cept the S2000's with duel's stock.

~Andrew~

 

[bosljeff]

Doesn't Pruven run a black 1g with dual exhaust? I remember seeing one in the SCC Ultimate whatever challenge. Why would they do it? You wouldn't think they would do something like that. Hmm, whatever.

 

[Morphius]

Originally posted by Laser93Nash
Maybe. But where would you run 2 exhaust pipes under the car? There isn't enough room. My friend has duel exhaust on his Civic. What the mechanic did is he put a muffler on before the pipe went over the rear axle. Then Y'd it off and ran anther pipe to the onther side of the car. And he just put tips on em. Thats the only way I could think about doing it for a 4 cyl. Cept the S2000's with duel's stock.

~Andrew~

You'd have to run two smaller diameter pipes side by side under the car. Remember that dividing it up, you don't need dual 2 1/4 or 3 inch pipes to exahust the gases. Two 2 inch pipes are going to have more flow capability than a single 2 1/4 or 2 1/2 inch pipe.

 

[Spyder FX]

they make mufflers with dual outlets. mount the muffler where the resonator is, and just weld some 2.5" pipes after the muffler to exit at the back of the car. not much extra weight and it'll still look nice with some decent tips welded on.

 

[DSMlaser4u]

i want a dual exaust w/ Apexi N1 if/when i get the 3000gt widebody kit from importfan

 

[ABK]

Dual exhaust would prolly if not mostlikely kill your torque alot and some hp, especially on a N/T. See dual exhaust straight from the headers wouldn't create enought backpressure you need for a N/T for turbo it would be too damn expensive and stupid. If you have it splitt some where in the rear it will cause major destorsion of exhaust and it might just create too much backpressure. Either way dumb idea.

 

[JoeZ]

Originally posted by ABK
Dual exhaust would prolly if not mostlikely kill your torque alot and some hp, especially on a N/T. See dual exhaust straight from the headers wouldn't create enought backpressure you need for a N/T for turbo it would be too damn expensive and stupid. If you have it splitt some where in the rear it will cause major destorsion of exhaust and it might just create too much backpressure. Either way dumb idea.

Not true at all...this is where the math comes in...

The formula for a circles area is Pi(R^2), with R being the radius and Pi we can use 3.1415

For a 3" pipe, pretty typical on turbo DSMs as diameter, it has a crossarea (the room for exhaust flow) of 7.0683 in sq.
3.1415*([3/2]^2) = 7.0683

Now if the flow ammount is to be divided by two (two exhaust pipes), then you would need roughly half the flow area.
7.0683/2 = 3.5341

Now we need to get what the diameter of pipe would generate a flow area listed above...
([3.5341/3.1415]^.1) = 2.0236

To sum it up, if you have two pipes that are roughly 2" in diameter you will have the same flow area of a single pipe of 3". The back pressure of the two should be similar, if not nearly the same.

Note: Going larger will create flow problems with lack of back pressure. Notice how large a difference 3" piping makes...it flows nearly twice as much as a 2", so going larger than 2" in a "duel" setup will hinder performance.

 

[JoeZ]

Just thought of something to add...this was figured with 3" piping from a turbocharged car...I'm not sure what downpipe size is sufficient for N/A DSMs. I'll rerun everything if you guys tell me the right size to use instead.

 

[Spyder FX]

I wouldn't go more than 2.5" single pipe on an N/A and even that is over kill. Personally I have a 2.25" but that's also because i have a 1.8L.

 

[miguels3000]

When i was looking for an exhaust I found one on the internet, manufactured specificly for an eclipse for dual exhaust from the catback. I tried searcing it but i couldnt find it, i know its out there, ill try again later.

 

[ABK]

Ok. Look at this way what you think will cause less distorsion? One pipe or two pipes? Yeah, if you have it splitt you would have one trying to pull exhaust out and second sometimes would try to suck in air. If you have it splitt in 2 from the downpipe or headers you would have to use something like a one inch exhaust to match a one 3 inch. Would look kind of ###, anything over that size creates backdraft.

 

[JoeZ]

Originally posted by ABK
Ok. Look at this way what you think will cause less distorsion? One pipe or two pipes? Yeah, if you have it splitt you would have one trying to pull exhaust out and second sometimes would try to suck in air. If you have it splitt in 2 from the downpipe or headers you would have to use something like a one inch exhaust to match a one 3 inch. Would look kind of ###, anything over that size creates backdraft.

If you had a header that was custom made to just join two cyls into one pipe and 2 into the other, there wouldn't be a problem. On top of this, I have NEVER EVER heard of an exhaust sucking air in a dual setup, which is what my corvette is.

And as for your comment about needing a 1" pipe to replace the 3", read my thorough explaination of the diameter needed. It's 2".

Last, you mention distortion? Want to really deal with distortion? Think of how much a muffler makes, and realize that a Y pipe is a very smooth transition. How much distortion does it create? minimal.

 

[Morphius]

Originally posted by Morphius
I currently have duals out the back on my 91 TSI FWD. I used a tri-flow muffler from a GM f-body. 3rd gen, Works just great. No performance gain, but it has a nice tone and looks cool.

I'd get a pic for you but the car is backed in my storage unit. It's apart for a motor change so I can't pull the car out. I'll dig around and see if I can mange to find a pic of it. If not, as soon as I'm done with the motor install I'll post them.

-DaimlerChrysler Engineer

Finally, found 1 pic of my old 91 GS that had the dual setup. I then transferred it to my 91 TSI FWD. Like I said, as soon as my car is finished, I'll take some better pics. But until then, this is the best shot I have.

You can see the two turn downs. Sounded pretty cool. Far better than stock.


-DaimlerChrysler Engineer.