Exhaust Question

[AlaskaRedneK]

Platnum..

I have only really payed alot of attention to the OBS powerstrokes...

And on them the 4" sounds kool (my friend has one), but the 5" sounds Awesome. "TheAlaskan" runs a 5" and I love his sound. I have 5" stacks (5" frum the post firewall back) and I am KRAZY about that sound.

It souns like a Peterbilt when Idling

I think I have a vid of a revv up I did before I got my chip, lemme find it.



Best of Luck!
-Stouff

 

[platinum01]

That is sweet. That is what I am looking for. How is the sound in the cab? Get annoying or doesn't even bother you? Good looking truck.

 

[AlaskaRedneK]

That is sweet. That is what I am looking for. How is the sound in the cab? Get annoying or doesn't even bother you? Good looking truck.

If you were talking to me, I like it alot.

It is more noticeable than an out the rear exhaust because it is aimed near the cab.... but it just gives it a light hum on the highway, and when you step on it......

Even if you decide to go w/ the out the rear exhaust, my reccomendation would be a 5".

Let us know what you decide!

-Stouff

 

[platinum01]

Thanks AlaskaRedneck. I am goin got go with the stacks. I have thought about it and looked at a bunch of different trucks. I have found a set of 5 - 6" stacks for about $600.00. SO that is what I am going to go with. When it is done I will post pictures and let ya'll know what I think. Thanks for the input.

 

[Digital Oxygen]

MOST systems avail are 3.5" from the down pipe to
soot trap (some call 'em cats)...and only after the soot
trap do they expand to 4"

Correct me if I'm wrong, but a Catalytic converter is NOT a "Soot Trap". Three way cats don't trap soot at all. The first stage is The Reduction Catalyst

It uses platinum and rhodium to help reduce the NOx emissions. When an NO or NO2 molecule contacts the catalyst, the catalyst rips the nitrogen atom out of the molecule and holds on to it, freeing the oxygen in the form of O2. The nitrogen atoms bond with other nitrogen atoms that are also stuck to the catalyst, forming N2. For example:

2NO => N2 + O2 or 2NO2 => N2 + 2O2

The Second Stage:

The Oxidization Catalyst
The oxidation catalyst is the second stage of the catalytic converter. It reduces the unburned hydrocarbons and carbon monoxide by burning (oxidizing) them over a platinum and palladium catalyst. This catalyst aids the reaction of the CO and hydrocarbons with the remaining oxygen in the exhaust gas. For example:

2CO + O2 => 2CO2

The Control System
The third stage is a control system that monitors the exhaust stream, and uses this information to control the fuel injection system. There is an oxygen sensor mounted upstream of the catalytic converter, meaning it is closer to the engine than the converter is. This sensor tells the engine computer how much oxygen is in the exhaust. The engine computer can increase or decrease the amount of oxygen in the exhaust by adjusting the air-to-fuel ratio. This control scheme allows the engine computer to make sure that the engine is running at close to the stoichiometric point, and also to make sure that there is enough oxygen in the exhaust to allow the oxidization catalyst to burn the unburned hydrocarbons and CO.

So as we can see, there is nothing "trapped" in the cats. It merely converts bad stuff to not so bad stuff. New EPA Laws do call for the afforementioned Soot Trap -IIRC, it's called a PM (Particulate Matter) Trap. That will be in addition to the catalytic converter(s).

I can't remember when the Catalytic Converter laws wents into effect, but Iw ant to say late 60's early 70's. So chances are, his 7.3 does have a catalytic converter on it. I could ask my friend google, but lunch is almost ready.

Source: http://auto.howstuffworks.com/catalytic-converter2.htm

 

[bushpilot]

Correct me if I'm wrong, but a Catalytic converter is NOT a "Soot Trap". Three way cats don't trap soot at all. The first stage is The Reduction Catalyst

It uses platinum and rhodium to help reduce the NOx emissions. When an NO or NO2 molecule contacts the catalyst, the catalyst rips the nitrogen atom out of the molecule and holds on to it, freeing the oxygen in the form of O2. The nitrogen atoms bond with other nitrogen atoms that are also stuck to the catalyst, forming N2. For example:

2NO => N2 + O2 or 2NO2 => N2 + 2O2

The Second Stage:

The Oxidization Catalyst
The oxidation catalyst is the second stage of the catalytic converter. It reduces the unburned hydrocarbons and carbon monoxide by burning (oxidizing) them over a platinum and palladium catalyst. This catalyst aids the reaction of the CO and hydrocarbons with the remaining oxygen in the exhaust gas. For example:

2CO + O2 => 2CO2

The Control System
The third stage is a control system that monitors the exhaust stream, and uses this information to control the fuel injection system. There is an oxygen sensor mounted upstream of the catalytic converter, meaning it is closer to the engine than the converter is. This sensor tells the engine computer how much oxygen is in the exhaust. The engine computer can increase or decrease the amount of oxygen in the exhaust by adjusting the air-to-fuel ratio. This control scheme allows the engine computer to make sure that the engine is running at close to the stoichiometric point, and also to make sure that there is enough oxygen in the exhaust to allow the oxidization catalyst to burn the unburned hydrocarbons and CO.

So as we can see, there is nothing "trapped" in the cats. It merely converts bad stuff to not so bad stuff. New EPA Laws do call for the afforementioned Soot Trap -IIRC, it's called a PM (Particulate Matter) Trap. That will be in addition to the catalytic converter(s).

I can't remember when the Catalytic Converter laws wents into effect, but Iw ant to say late 60's early 70's. So chances are, his 7.3 does have a catalytic converter on it. I could ask my friend google, but lunch is almost ready.

Source: http://auto.howstuffworks.com/catalytic-converter2.htm

do you even OWN a ford/diesel truck...cant tell by your signature...
or by your knowledge.

youre right about how cats work, and they work by HEAT (produced
by adjustments in the mixture of fuel & air)...

since theres no o2 sensors pre OR post on ANY of our cats theres
no way for the system to tell if its working w/in spec or not...theres
no "mixture" adjustment happening so at best its an ATTEMPT at
using a cat....and there for it traps more SOOT than anything.

even the new 6.4L will be built to TRAP soot & ocassionaly burn it off
w/ a RICH mixture from increased heat (how much filtering you think
that cat is gonna be doing during these burn cycles....)

cats didnt go into use "generally" until '74 on gasoline cars...and
they were open loop for the most part...some had NO o2
sensors and none had any post cat....

cats have NOT been used on diesels until the last couple of years.

regarding ford deisels, since you apparently arent familar w/ them:
there were a few years (one, maybe 2...its spotty at best) pre 99
that had cats.

in 99 (new body style) none of the 7.3's had cats.
the 03 6.0L didnt have a cat and SOME 04 6.0L didnt get
cats til mid year productions.

mid production 04 to current have cats....but NONE have o2 sensors.

 

[jvencius]

in 99 (new body style) none of the 7.3's had cats.
the 03 6.0L didnt have a cat and SOME 04 6.0L didnt get
cats til mid year productions.

mid production 04 to current have cats....but NONE have o2 sensors.

Not quite--my '02 7.3/ZF-6 had a cat. I still deny any knowledge of what that cat-shaped chunk of metal on my garage shelf is or how it got there...

 

[Digital Oxygen]

do you even OWN a ford/diesel truck...cant tell by your signature...
or by your knowledge.

Surprisingly, I do. However, I believe I have CLEARLY stated in my intro thread that I know next to nothing about the inner workings of a diesel. But at the risk of sounding reduntant -which some people love to do-, I will restate it. I Know next to nothing about the inner workings of a diesel. Happy?

since theres no o2 sensors pre OR post on ANY of our cats theres
no way for the system to tell if its working w/in spec or not...theres
no "mixture" adjustment happening so at best its an ATTEMPT at
using a cat....and there for it traps more SOOT than anything.

I'm well aware there are no O2 sensors on a Diesel. Incidentally, Post Cat sensors on Gassers are not really O2 sensors. All they do is check on the health of the catalyst contained in the Converters by comparing the input from the pre cat sensors. But I digress.

even the new 6.4L will be built to TRAP soot & ocassionaly burn it off
w/ a RICH mixture from increased heat (how much filtering you think
that cat is gonna be doing during these burn cycles....)

That was my point. Catalytic Converters are generally not known to be Soot Traps. That's why there is a soot trap called for on new diesels.

cats didnt go into use "generally" until '74 on gasoline cars...and
they were open loop for the most part...some had NO o2
sensors and none had any post cat....

Post Cat Sensors came into existence after 1995, when OBD II was made standard. So yeah, chances are pre OBD II cars did not have Post Cat Sensors.

cats have NOT been used on diesels until the last couple of years.

Fair Enough.

in 99 (new body style) none of the 7.3's had cats.
the 03 6.0L didnt have a cat and SOME 04 6.0L didnt get
cats til mid year productions.

I actually went outside to look at this. My 2003 MY happens to have a Catalytic converter on it. Unless The big roundish drum under the passenger is another muffler. If it's not another muffler, then I must have an 04, right? Damn, pulled a fast one on the dealership then. heh

mid production 04 to current have cats....but NONE have o2 sensors.

[/quote]

Ok, then see above. And Again, I am well aware Diesels don't run O2 Sensors. No need to regurgitate the same info you posted above.

Regardless, I will continue to call ducks "ducks", and chickens "chickens".

Thank you for the info on diesels not having had catalytic converters until a few years ago. That I did not know. Learn something new everyday.

 

[AlaskaRedneK]

That is sweet. That is what I am looking for. How is the sound in the cab? Get annoying or doesn't even bother you? Good looking truck.

I think you can git alot better deal than that....

Check Ebay, The kit I was gunna buy (before I decided to fab mine up) was like 400 buks.......

chek out this link:
http://stores.ebay.com/Trucks-to-clubs



Contact me if there is any other questions I might be able to help you with

-Stouff

 

[platinum01]

Sweet thanks I will check it out and see what they have to offer. Stacks are cool