Exhaust size and gain in relation to the pain...... - Ford Powerstroke Diesel Forum
6.0L Performance Parts Discussion What has or has not worked for you?

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 25 Old 11-05-2008, 03:33 PM Thread Starter
Compression Ignition Addict
 
Join Date: Mar 2006
Location: Australia
Posts: 1,084
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Exhaust size and gain in relation to the pain......

From study of the Forum, I have a 3 1/2 Turbo back down pipe on the way. Now, also from research, and with fuel economy in mind, I am going Sct Xcal 3 and for big towing a EGT probe...

Question: For just Fuel Economy, Since I am going 3 1/2 downpipe, is there any gain to be had in going to 4" with the rest of the exhaust??? Or should I just carry on with kitty gone, straight as possible, free flow straight glass pack type muffler and stay in 3 1/2 "

What do you think, any sense in going 4"? Or go 4" anyway as I may want to upgrade the engine studs and HP in the future? Or a waste over 3 1/2"?

Or just carry an extra pair of socks in my pants... and go straight 3 1/2"

And God Bless America! Even if it is an "Obamanation" now
Lone Ranger is offline  
post #2 of 25 Old 11-05-2008, 03:35 PM
Compression Ignition Addict
 
Join Date: Jan 2008
Location: salem ohio
Posts: 153
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
go 4 so the egt's will stay down.

ford with stacks equals redneck
town kid is offline  
post #3 of 25 Old 11-05-2008, 03:44 PM Thread Starter
Compression Ignition Addict
 
Join Date: Mar 2006
Location: Australia
Posts: 1,084
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Ooooooooooooo GOOOD POINT !!!!

Didn't think of dat one !!! Well 4" is it !! That way if I want to get stupid over stacks and 500 HP the 4" will still do..

Thank you for the point well taken... EGTs and 4" it is... !!! Regards from Oz
Lone Ranger is offline  
post #4 of 25 Old 11-05-2008, 03:46 PM
Compression Ignition Addict
 
Join Date: Jan 2008
Location: salem ohio
Posts: 153
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
no problem just trying to help some one out
what kind of stack would u do.

ford with stacks equals redneck
town kid is offline  
post #5 of 25 Old 11-05-2008, 03:47 PM
Compression Ignition Addict
 
Join Date: Jan 2008
Location: salem ohio
Posts: 153
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
no problem just trying to help a member out
what kind of stacks would u do.

ford with stacks equals redneck
town kid is offline  
post #6 of 25 Old 11-05-2008, 04:16 PM Thread Starter
Compression Ignition Addict
 
Join Date: Mar 2006
Location: Australia
Posts: 1,084
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Stacks would be good looking, but probably will not fit the KR Dually inside the bed... Big Kenworth style Chromies outside the bed in front of the Dually fenders would be Coooool, but not parked in front of my office..
Lone Ranger is offline  
post #7 of 25 Old 11-06-2008, 04:49 AM
N.S.D.Q.


 
HeavyAssault's Avatar
 
Join Date: Oct 2007
Location: Middle VA
Posts: 4,850
Thanks: 26
Thanked 91 Times in 80 Posts
Mentioned: 0 Post(s)
Quoted: 61 Post(s)
Feedback Score: 3 reviews
EGTs are best measured pre-turbo. Since the CFM between 3.5" and 4" is like 400CFM difference you need a larger turbo to move the air to see the difference in EGTs.


Officially The Biggest Midget In The Game
(In support of Zmann's request)

HeavyAssault is offline  
post #8 of 25 Old 11-06-2008, 12:28 PM Thread Starter
Compression Ignition Addict
 
Join Date: Mar 2006
Location: Australia
Posts: 1,084
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Thank you for that HeavyAssault.....

So now I am back to Zip, zero, nada, nuttin......

Alright, if the move from a 3.5" downpipe to go to 4" does not help EGTs, is there any sense in it? Or stick with a straight 3.5 all the way?

The other concept to consider: If there is not enough flow, there will be carbon build up in the system, without enough CFM to blow it out if you go too big... It will naturally build up soot until the CFM is big enough again to blow it out, lining the exhaust system.....

I am not enough of an Engineer to manually calculate just where that point is..

OK.... What now? 3.5 straight? or step up to 4".... What has been the experience doing it in the field?
Lone Ranger is offline  
post #9 of 25 Old 11-06-2008, 12:30 PM
Compression Ignition Addict
 
Join Date: Jan 2008
Location: salem ohio
Posts: 153
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
no u dont want a stock pipe cuz u will have high egt's

ford with stacks equals redneck
town kid is offline  
post #10 of 25 Old 11-06-2008, 12:31 PM
Compression Ignition Addict
 
Join Date: Jan 2008
Location: salem ohio
Posts: 153
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
it does'nt matter wat size the turbo is it just maters wat size exhaust u are running.

ford with stacks equals redneck
town kid is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Ford Powerstroke Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome