Exhaust Theories and Question - Ford Powerstroke Diesel Forum
Powerstroke.org is the premier Diesel Truck Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 06-17-2010, 02:19 PM
PMR = JUNK

 

Join Date: Nov 2007
Location: NW, Ohio
Posts: 11,187
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 2 reviews
Send a message via AIM to Jake Send a message via Yahoo to Jake
Exhaust Theories and Question

Based on my knowledge of engine theories, i know going with a bigger exhaust will have a tendency to move the power curve up higher. Ideally one would want to have an exhaust large enough to handle all of the given exhaust volume with no back pressure, yet small enough to keep the velocity at its max speed throughout the system. Obviously in the real world its impossible to have a perfect system. If its too big, velocity will drop decreasing the scavenging effect and possibly in a sense creating backpressure due to lack of flow. On the other hand, go to small, i don't think i even need to explain that one.

So my question is, would going with a 5 inch exhaust hurt power at all in the lower RPM range as opposed to a stock 3.5 or 4" exhaust? With the extra volume capacity, i would think velocity will most likely take a hit to the point of possibly hurting power in the lower end.

I know thats alot for such a simple question, but i figure id attract more knowledgeable people to answer my question, and be on the same page intellectually, and possibly weed out the people that will just give an answer of "i don't know, it shouldn't" or something along those lines.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 06-17-2010, 03:24 PM
Compression Ignition Addict
 

Join Date: Dec 2008
Posts: 307
Thanks: 2
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Subscribed.
Reply With Quote Quick reply to this message
  #3  
Old 06-17-2010, 03:27 PM
Compression Ignition Addict
 

Join Date: Mar 2010
Location: New Riegel, Ohio
Posts: 1,679
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
i dont know, it should ha ha i jk jake you be over tomorrow???
Reply With Quote Quick reply to this message
  #4  
Old 06-17-2010, 03:27 PM
Almostdunfukinwidit


 

Join Date: Nov 2006
Location: Trempealeau, WI
Posts: 31,351
Thanks: 126
Thanked 130 Times in 115 Posts
Feedback Score: 0 reviews
Send a message via Yahoo to Dave
Short answer. Yes you will lose low end power by going with a 5 inch exhaust on a stock injectored and turboed truck
Reply With Quote Quick reply to this message
  #5  
Old 06-17-2010, 03:28 PM
Almostdunfukinwidit


 

Join Date: Nov 2006
Location: Trempealeau, WI
Posts: 31,351
Thanks: 126
Thanked 130 Times in 115 Posts
Feedback Score: 0 reviews
Send a message via Yahoo to Dave
Actually you may even lose a little low end by going to a 4 inch exhaust. But not enough to be overly noticable
Reply With Quote Quick reply to this message
  #6  
Old 06-17-2010, 06:17 PM
PMR = JUNK

 

Join Date: Nov 2007
Location: NW, Ohio
Posts: 11,187
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 2 reviews
Send a message via AIM to Jake Send a message via Yahoo to Jake
Quote:
Originally Posted by YodersStrokin96 View Post
i dont know, it should ha ha i jk jake you be over tomorrow???
Idk. I'll call you in a bit when nick leaves.

Quote:
Originally Posted by Dave View Post
Short answer. Yes you will lose low end power by going with a 5 inch exhaust on a stock injectored and turboed truck
But how much? 5 horse?
Reply With Quote Quick reply to this message
  #7  
Old 06-17-2010, 06:32 PM
Almostdunfukinwidit


 

Join Date: Nov 2006
Location: Trempealeau, WI
Posts: 31,351
Thanks: 126
Thanked 130 Times in 115 Posts
Feedback Score: 0 reviews
Send a message via Yahoo to Dave
Quote:
Originally Posted by Jake View Post
Idk. I'll call you in a bit when nick leaves.



But how much? 5 horse?
I cant give you a number but it will be noticable
Reply With Quote Quick reply to this message
  #8  
Old 06-17-2010, 08:26 PM
PMR = JUNK

 

Join Date: Nov 2007
Location: NW, Ohio
Posts: 11,187
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 2 reviews
Send a message via AIM to Jake Send a message via Yahoo to Jake
Noticeable is bad...
Reply With Quote Quick reply to this message
  #9  
Old 06-18-2010, 04:25 PM
Compression Ignition Addict
 

Join Date: Oct 2009
Location: Batavia,IL
Posts: 214
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 1 reviews
Just put 5" on my truck last weekend, it is noticeable, and i also have a banks 1.0 exhaust housing...stock tune........
Reply With Quote Quick reply to this message
  #10  
Old 06-18-2010, 04:27 PM
Super Moderator

 

Join Date: Nov 2008
Posts: 13,271
Thanks: 0
Thanked 1 Time in 1 Post
Feedback Score: 2 reviews
FWIW, I saw a loss of low end when I put my 4" exhaust on. Its not even a 4" dp either. Now that I have my tuner it does not matter though
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
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:

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
Display Modes

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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -8. The time now is 07:08 PM.


Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.1
Garage Plus, Vendor Tools vBulletin Plugins by Drive Thru Online, Inc.

vB.Sponsors