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MadMason
Dodge Dakota
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7/02/2006
06:19:58
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 Subject: True Dual Exhaust and O2 Sensor
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Hi
I'm thinking of building a true dual exhaust for my 98 Dakota V6.
I'm just concerned about the placement of the O2 Sensor.
I found a cat from Magnaflow with 2 In and 1 Out that provides a O2 Sensor Boss. Is there also a cat with 2 In and 2 Out an such an Boss?
Or should I just place the O2 Sensor on one side after the headers?
Thanks a lot in advance
Dan
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GB2000
GenIII
7/02/2006
06:27:28
|  RE: True Dual Exhaust and O2 Sensor
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I'd just get an O2 sim and call it good enough...
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MadMason
Dodge Dakota
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7/02/2006
12:24:30
| RE: True Dual Exhaust and O2 Sensor
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o2 sim for the downstream sensor, but what about the upstream one?
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Josh
Dodge Dakota
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7/02/2006
15:34:13
| RE: True Dual Exhaust and O2 Sensor
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Upstream O2 sensor is needed for engine fuel management. Keep that one. One of its many functions is to keep the air/fuel mixture where it needs to be.
The downstream sensor informs the PCM of catalytic converter efficiency, and can be simulated easily.
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Obio3
Dodge Dakota
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7/02/2006
17:07:50
| RE: True Dual Exhaust and O2 Sensor
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A cat with 2 in and 2 out is still a single exhaust. You will need 2 cats for true duels . And I have a problem with one o2 on one pipe with true duels. Only half the exhaust will be going past that o2. I can see no way it can work as intended and give actual accurate info to the comp to keep things running as needed. I've never done true duels so mayby I'm off base here. I'm working with what seems to be logical thinking.
So many problems .... So little time
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zzark
*GenII*
7/02/2006
19:39:37
| RE: True Dual Exhaust and O2 Sensor
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Obio3,
That's the problem, trying to use logic. LOL
Dual exhaust on a V6 is a waste anyway.
It just isn't needed, nor beneficial.
zzark
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DanK
Dodge Dakota
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7/03/2006
00:42:47
| RE: True Dual Exhaust and O2 Sensor
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Obio. Single upstream O2 sensor should work fine if the engine is in good tune. The exhaust gas volume (and therefore velocity) will be halved, but the sensor is still sniffin 100% exhaust gas. If he chooses wrong, and one cylinder in that bank is running rich or lean because of some injector problem, it will affect the entire engine's performance a great deal more than if that cylinder's exhaust were averaged with 5 others instead of just two.
MadMason. If you go duals, I hope you take a real good read of your plugs so you'll know you're putting the O2 sensor on the healthier side's exhaust. Also, engine maintenance and tune becomes more critical, to avoid the dreaded Check Engine Light.
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GraphiteDak
GenIII
7/03/2006
02:23:59
| RE: True Dual Exhaust and O2 Sensor
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I've been running true duals for a while now.
I have dual cats, one per bank on my 4.7 V8 but am only running the O2 sensors before and after ONE of the cats.
It works just fine and has never thrown a code.
But like someone said, on a engine in good tune, it will adjust just fine even though it's only taking samples from one half of the engine.
The other thing I've heard of people doing is running an X-Pipe right before the dual cats and sticking the O2 sensor in there. Placement of the 2nd O2 isn't important as it is mainly to check Cat efficiency.
As for the V6 duals, no offence but every V6 I've heard with duals sound truely HORRIBLE!
I'd keep the V6 quiet. If you want it to sound mean, save and build a turbo for it. Then at least when they hear the sound of that passing them by, it would be better than the sound of a farty V6 with no power.
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ricardcapecod
Dodge Dakota
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7/03/2006
15:45:08
| RE: True Dual Exhaust and O2 Sensor
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No offense, but instead of getting duals, get two mufflers. This way, you can drive quieter and people will not know yours is a v6.
With duals on a v6 w/ no modes, you will loose lots of HP and specialy torque before 3000 rpm.
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MadMason
Dodge Dakota
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7/03/2006
16:11:40
| RE: True Dual Exhaust and O2 Sensor
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thanks for all that advice.
i might just go with a magnaflow high flow cat 1 In / 1 Out and then a flowmaster 40 or 50 1 In / 2 Out
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GraphiteDak
GenIII
7/03/2006
20:17:34
| RE: True Dual Exhaust and O2 Sensor
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I drove my wife CRAZY when I was looking through Dakota's to find the one I wanted.
The MAIN thing I HAD to have was a V8 and most of them on the lot had V6's.
KNowing how I am, I knew I wanted to do some mods, yet have some power to begin with. And I know how I always like a nice throaty and powerful sounding exhaust.
The flowmaster/dynomax, etc on a V6 just sounds kind of horrible and not trying to be a d*ck, but when we hear the farty sound of a V6 through a loud exhaust, we always chuckle :D
The only way I'd open up a V6 exhaust is if I had it behind a turbo. And at that point it wouldn't matter as much when the turbo would take the attention away form the farty exhaust.
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MadMason
Dodge Dakota
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7/04/2006
03:10:51
| RE: True Dual Exhaust and O2 Sensor
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@GraphiteDak
i don't have the bucks for a turbo
and neither for an v8
my current exhaust system is totally rusted and my cat is broken so i need to get a replacement. i'm just looking for something decent sounding, even for an v6.
Some people say borla makes some good mufflers, what do you think about them?
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GB2000
GenIII
7/04/2006
03:23:16
| RE: True Dual Exhaust and O2 Sensor
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Borla sounds AWESOME...on V8's. Never heard one on a V6 Dak though. The general consensus for V6 Daks is the Dynomax Super Turbo (p/n: 17748).
I have a Flowmaster 40 series with a turndown right off the muffler...it sounds cool, but it's a bit loud and sounds quite ricey in the upper RPMs. My friends like it...say it sounds, "unique", but I'm not satisfied. Next thing I'm gonna try is prolly the Dynomax. Oh and not to mention...my Flowmaster has a tendency to set off car alarms when I pass them parked on the side of the street. Not good if you're in an area with prick cops.
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zzark
*GenII*
7/04/2006
09:47:35
| RE: True Dual Exhaust and O2 Sensor
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MadMason,
Now you're talkin
And that will be less $
I have the Flowmaster 50. Sounds good, not too loud.
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GraphiteDak
GenIII
7/04/2006
19:36:38
| RE: True Dual Exhaust and O2 Sensor
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Oh, ok you want to fix up your worn exhaust. That makes sense to fix it up.
I'd ask around on what would not be TOO loud. I have put a few Flowmaster's on V6's and they get the V6 drone and NO rumble once you get on the throttle.
Maybe a Flowmaster 50 would be better. I heard those are not as loud. But flow better than your old one.
Here's a sound sample I still had from before... V6 Flowmaster Sound
I'd get a better Cat too.
And anything straight through like a glass pack is going to be LOUD :D
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MadMason
Dodge Dakota
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7/06/2006
03:57:42
| RE: True Dual Exhaust and O2 Sensor
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thanx for all your advise
the cat is broken too so i think i will get a magnaflow high flow cat...is this a good choice?
as for the muffler: currently there is my rusted dynomax super turbo 1 In/ 2 Out on it and i liked the sound before it was rusted...so maybe i just stick with that. the flowmaster sample really sounded more like a ricer than a truck
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Matt
Dodge Dakota
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7/06/2006
17:39:41
| RE: True Dual Exhaust and O2 Sensor
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seeing how this thread has already gone way off topic, i thought i'd ask another question. i will eventually be getting a new exhaust and was wondering what type of muffler i should get. i have a v8 but only want a single exhaust (dual is too cliche and doesn't look good to me). but i still want a really deep sound, not very loud unless i'm hammering the pedal.
thanks
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Matt
Dodge Dakota
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7/06/2006
18:01:42
| RE: True Dual Exhaust and O2 Sensor
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i suppose i should also tell you that i will also install headers and a k&n intake, just incase that would affect your recommendation
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ricardcapecod
Dodge Dakota
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7/08/2006
02:19:19
| RE: True Dual Exhaust and O2 Sensor
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Matt, i have Gibson headers and single 3 in cat back.
I like its sound better than any other. It is loud when you step on the gas and yet it is very refined. No ressonances in any rpm . I recomend the stainless.
I also have K&N fipk and the combination of all these new noises are awesome.
The K&N fipk sounds like a 4 barrels carburetor on those old v8s
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GraphiteDak
GenIII
7/08/2006
12:37:15
| RE: True Dual Exhaust and O2 Sensor
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Matt, the Flowmaster 40 series Delta Flow seemed to be quiet at steady throttle when I had single exhaust. Yet was deep and very noticable when I would give it some throttle. That was with all stock pipe.
WHen people do duals, 99% of the duals people have around where I live had duals AFTER the muffler. I ran duals from my manifolds back, two cats etc.
My brother in law lives up the street and I have to drive by his house. Again the other day he calls me about coming over, saying he heard me drive by.
Again I am like WTF??? So I ask how he knows MY truck from any other loud(er) truck in my hood?
He says mine is just distinctive. Probably because mine may be the ONLY true dual truck in the hood. :)
You could just replace the muffler only and it would sound good (on the V8), but not too loud.
You want loud, run duals with glass packs! Nothing is that loud but a straight pipe!
I ran glass packs for a month on the Dak. Wow. Loud is hard to describe :P
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shatto
Dodge Dakota
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7/08/2006
19:22:29
| RE: True Dual Exhaust and O2 Sensor
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The exhaust performance guys spend big money licensing their product with the Federal and State Governments as "Legal."
I would wonder if yours would be, unless it is strictly for off-road use.
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