F150online Forums

need some opinions on exhaust.

Thread Tools
 
Search this Thread
 
  #16  
Old 12-08-2009, 09:16 PM
DarrenWS6's Avatar
Technical Article Contributor


Join Date: Mar 2008
Location: Mansfield, P.A.
Posts: 16,436
Received 4 Likes on 4 Posts
Originally Posted by mblouir
While we're on the subject, how much of a loss (estimate in #s) are we talking about? What would be the loss associated with going from 2.5" to 2.25" with everything else the same?

I'm just curious because my truck came with 2.5" duals on it so I have no idea how much it lost from the stock setup. Wondering if it's negligible or if it's only noticeable when say, towing, like Darren mentioned.
Only when towing really. Since we have the same wheel & tire setup and basically the same tunes except im burning 87, if you think your truck is real torquey then good, but full 2.25" might help on the take off a little bit. Its not worth changing your exhaust out, especially you with all of the work you just got done.
 
Reply Like
  #17  
Old 12-08-2009, 09:17 PM
avfrog's Avatar
Senior Member
Join Date: Oct 2009
Location: Missouri
Posts: 6,172
Likes: 0
Received 1 Like on 1 Post
On top of that, you will lose some mid range acceleration, and possibly a little highway mpg...
 
Reply Like
  #18  
Old 12-08-2009, 09:26 PM
avfrog's Avatar
Senior Member
Join Date: Oct 2009
Location: Missouri
Posts: 6,172
Likes: 0
Received 1 Like on 1 Post
It's really more about changing the torque curve rather than peak numbers...
 
Reply Like
  #19  
Old 12-08-2009, 09:35 PM
DarrenWS6's Avatar
Technical Article Contributor


Join Date: Mar 2008
Location: Mansfield, P.A.
Posts: 16,436
Received 4 Likes on 4 Posts
Originally Posted by avfrog
On top of that, you will lose some mid range acceleration, and possibly a little highway mpg...
with what?
 
Reply Like
  #20  
Old 12-08-2009, 09:36 PM
avfrog's Avatar
Senior Member
Join Date: Oct 2009
Location: Missouri
Posts: 6,172
Likes: 0
Received 1 Like on 1 Post
2.25
 
Reply Like
  #21  
Old 12-08-2009, 09:41 PM
f150fella08's Avatar
Senior Member
Join Date: Feb 2008
Location: Pittsburg, Texas
Posts: 4,637
Likes: 0
Received 2 Likes on 2 Posts
i didnt notice anything until i went from true dual 10's 3"inlet and 3" outlet with 2.5" pipe to true dual straights with all 2.5" pipe noticed a little difference
 
Reply Like
  #22  
Old 12-08-2009, 09:41 PM
DarrenWS6's Avatar
Technical Article Contributor


Join Date: Mar 2008
Location: Mansfield, P.A.
Posts: 16,436
Received 4 Likes on 4 Posts
Originally Posted by avfrog
2.25
Incorrect. 12.25" performs exactly as 2.5" does, with an advantage in low end power. 2.25" will stay in 4th gear O/D on hills longer than 2.5" will because scavenging keeps velocity at a high pressure. Sounds just as good, just performs better.
 
Reply Like
  #23  
Old 12-08-2009, 09:44 PM
f150fella08's Avatar
Senior Member
Join Date: Feb 2008
Location: Pittsburg, Texas
Posts: 4,637
Likes: 0
Received 2 Likes on 2 Posts
damn! 12.25" pipe! thats bigger than my grandads peterbuilt stacks!!!!
 
Reply Like
  #24  
Old 12-08-2009, 09:47 PM
avfrog's Avatar
Senior Member
Join Date: Oct 2009
Location: Missouri
Posts: 6,172
Likes: 0
Received 1 Like on 1 Post
Originally Posted by DarrenWS6
Incorrect. 12.25" performs exactly as 2.5" does, with an advantage in low end power. 2.25" will stay in 4th gear O/D on hills longer than 2.5" will because scavenging keeps velocity at a high pressure. Sounds just as good, just performs better.
12.25?? That's some large pipe!!

I figure you will loose a little in higher rpm, but I could be wrong... I still disagree with the sound. 2.5 does sound better!

Not trying to argue, just opinions...
 
Reply Like
  #25  
Old 12-08-2009, 09:47 PM
DarrenWS6's Avatar
Technical Article Contributor


Join Date: Mar 2008
Location: Mansfield, P.A.
Posts: 16,436
Received 4 Likes on 4 Posts
Originally Posted by f150fella08
damn! 12.25" pipe! thats bigger than my grandads peterbuilt stacks!!!!
I've been texting all day so my fingers are cramped, and im in a irritated mood
 
Reply Like
  #26  
Old 12-09-2009, 03:36 PM
2001 5.4's Avatar
Senior Member
Join Date: Feb 2009
Location: nc
Posts: 684
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by DarrenWS6
I've been texting all day so my fingers are cramped, and im in a irritated mood
go blow somethin up
 
Reply Like
  #27  
Old 12-09-2009, 03:45 PM
DarrenWS6's Avatar
Technical Article Contributor


Join Date: Mar 2008
Location: Mansfield, P.A.
Posts: 16,436
Received 4 Likes on 4 Posts
Originally Posted by 2001 5.4
go blow somethin up
Wish I could. It snowed real hard last night so that made me happy
 
Reply Like
  #28  
Old 12-09-2009, 03:54 PM
svt4lyfe's Avatar
Senior Member
Join Date: Oct 2006
Location: Ocala, FL
Posts: 319
Likes: 0
Received 0 Likes on 0 Posts
Okay, hows this to throw a wrench in the works..

I've heard all this talk about either 2.25 or 2.5" piping...

My Maggie I just got is 3" in, 3" out, and i Plan on running 3" piping from the muffler back to the tip....how is the 3" piping going to affect power/torque/sound????
 
Reply Like
  #29  
Old 12-09-2009, 04:01 PM
DarrenWS6's Avatar
Technical Article Contributor


Join Date: Mar 2008
Location: Mansfield, P.A.
Posts: 16,436
Received 4 Likes on 4 Posts
Originally Posted by svt4lyfe
Okay, hows this to throw a wrench in the works..

I've heard all this talk about either 2.25 or 2.5" piping...

My Maggie I just got is 3" in, 3" out, and i Plan on running 3" piping from the muffler back to the tip....how is the 3" piping going to affect power/torque/sound????
3" is fine for a single exhaust. If you have true duals ( dual midpipes ) you can run them too thick because the engine will not receive enough velocity to keep low end power strong. It will have to have more gas to make the power which strains the transmission and wastes gas. For your single midpipe 3" is absolutely perfect.
 
Reply Like
  #30  
Old 12-09-2009, 04:40 PM
svt4lyfe's Avatar
Senior Member
Join Date: Oct 2006
Location: Ocala, FL
Posts: 319
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by DarrenWS6
3" is fine for a single exhaust. If you have true duals ( dual midpipes ) you can run them too thick because the engine will not receive enough velocity to keep low end power strong. It will have to have more gas to make the power which strains the transmission and wastes gas. For your single midpipe 3" is absolutely perfect.
nice. thanks man
 
Reply Like
Back to Subforum
Exhaust & Intake Systems
View Next Unread
true duals and o2 sensor




Advanced Search
Quick Reply: need some opinions on exhaust.


Reply Closed Thread Share

All times are GMT -4. The time now is 02:17 PM.