Notices
6.4L Power Stroke Diesel Engine fitted to 2008 - 2010 F250, F350 and F450 pickup trucks and F350 + Cab Chassis

turbo back exhuast or down pipe back?

 
  #1  
Old 10-20-2012, 12:28 AM
tuffnufly81
tuffnufly81 is offline
New User
Thread Starter
Join Date: Oct 2012
Posts: 15
tuffnufly81 is starting off with a positive reputation.
turbo back exhuast or down pipe back?

Hello,

Im fixing to bite the bullet and do upgrades, tuner, exhuast, intake, and EGR delete. Was wondering about turbo back or downpipe back and how hard is it to remove the stock down pipe. I read on here that you have to cut the factory down pipe to get it out.

O and 4" or 5" exhuast?

thanks
 
  #2  
Old 10-20-2012, 08:12 AM
slowmans's Avatar
slowmans
slowmans is offline
Postmaster
Join Date: Jan 2006
Posts: 2,694
slowmans has a good reputation on FTE.slowmans has a good reputation on FTE.
If your ever going to have to return to stock for inspection/emmissions reasons, I would just do a delete pipe....If not then turbo back.
 
  #3  
Old 10-21-2012, 10:09 AM
StanleyZ's Avatar
StanleyZ
StanleyZ is offline
Postmaster
Join Date: Nov 2001
Posts: 3,468
StanleyZ is a splendid one to beholdStanleyZ is a splendid one to beholdStanleyZ is a splendid one to beholdStanleyZ is a splendid one to beholdStanleyZ is a splendid one to beholdStanleyZ is a splendid one to beholdStanleyZ is a splendid one to beholdStanleyZ is a splendid one to behold
I agree. Unless you intend to drag race I think you will find that removing the DOC back and adding any tune or even a stock tune will give you plenty of new found power.

A number of people on this forum have reported problems with after market air filters and knowledgable diesel guys say unless you're adding 200 or more HP the stock filter is plenty adaquate.

Plus, once you cut the down pipe it's over. No going back without pulling the engine or finding an extremely talanted welder.
 
  #4  
Old 10-21-2012, 12:58 PM
UGA33's Avatar
UGA33
UGA33 is online now
Post Fiend
Join Date: Sep 2006
Location: Cartersville, Ga
Posts: 5,304
UGA33 has much to be proud ofUGA33 has much to be proud ofUGA33 has much to be proud ofUGA33 has much to be proud ofUGA33 has much to be proud ofUGA33 has much to be proud ofUGA33 has much to be proud ofUGA33 has much to be proud ofUGA33 has much to be proud of
IMO, down pipe back 5".
 
  #5  
Old 10-24-2012, 11:03 PM
FivePointo's Avatar
FivePointo
FivePointo is offline
Senior User
Join Date: Jul 2006
Location: Douglasville, Georgia
Posts: 129
FivePointo is starting off with a positive reputation.
I did turbo back and went 4" out the back. I wish I'd have just done 5" and left the down pipe stock. The down pipe was a nightmare, it's not a 1 man job and it's certainly not this man and his wife job. I've been married 20+ years and heard my wife say words I am unsure sailors know.
 
  #6  
Old 10-26-2012, 06:59 AM
Laner's Avatar
Laner
Laner is offline
Junior User
Join Date: Sep 2007
Posts: 51
Laner is starting off with a positive reputation.
This is good information! I will be ordering a mini maxx and down pipe back exhaust soon as my warranty just ran out. I am not sure if I want to go with 4 or 5 inch.
FivePointo -why do you wish you had went with 5" instead of the 4"?
 
  #7  
Old 10-26-2012, 03:38 PM
StanleyZ's Avatar
StanleyZ
StanleyZ is offline
Postmaster
Join Date: Nov 2001
Posts: 3,468
StanleyZ is a splendid one to beholdStanleyZ is a splendid one to beholdStanleyZ is a splendid one to beholdStanleyZ is a splendid one to beholdStanleyZ is a splendid one to beholdStanleyZ is a splendid one to beholdStanleyZ is a splendid one to beholdStanleyZ is a splendid one to behold
Originally Posted by Laner View Post
This is good information! I will be ordering a mini maxx and down pipe back exhaust soon as my warranty just ran out. I am not sure if I want to go with 4 or 5 inch.
FivePointo -why do you wish you had went with 5" instead of the 4"?
Let's think about it a minute. The purpose of the larger exhaust is to allow more exhaust (air) to exit the turbo. If the down pipe is 3.5 inches, which I think it is, then what would a larger pipe behind that do for you. Other than looking more robust at the end of the tail pipe it can't do anything. It is down stream from the obstruction. But, I promise that when you start your truck for the first time after the tuner and delete you will be impressed with the power, even with a stock pipe.
 
  #8  
Old 10-26-2012, 04:26 PM
FivePointo's Avatar
FivePointo
FivePointo is offline
Senior User
Join Date: Jul 2006
Location: Douglasville, Georgia
Posts: 129
FivePointo is starting off with a positive reputation.
No logic to me yea the stock unit is 3 1/2 in
 
  #9  
Old 10-26-2012, 04:46 PM
RM2738's Avatar
RM2738
RM2738 is offline
Posting Guru
Join Date: Sep 2010
Location: The Woodlands, TX
Posts: 2,200
RM2738 has a very good reputation on FTE.RM2738 has a very good reputation on FTE.RM2738 has a very good reputation on FTE.
I've got news for everyone. The OD may be 3.5" but the ID is far from it. I'm not gonna say whether or not you should do turbo back, but I'll be you will after this:


<a href="http://s68.photobucket.com/albums/i34/westwoodlands/?action=view&current=AD5358B9-AC3C-4352-9B57-3A9F3A6BDFAF-1006-00000068E13B9887.jpg" target="_blank"><img src="http://i68.photobucket.com/albums/i34/westwoodlands/AD5358B9-AC3C-4352-9B57-3A9F3A6BDFAF-1006-00000068E13B9887.jpg" border="0" alt="Photobucket Pictures, Images and Photos" /></a>
 
  #10  
Old 10-26-2012, 04:58 PM
Laner's Avatar
Laner
Laner is offline
Junior User
Join Date: Sep 2007
Posts: 51
Laner is starting off with a positive reputation.
What is the sq inches of area in that cross section vs a 3-1/2 or 4" round pipe?
 
  #11  
Old 10-26-2012, 05:03 PM
RM2738's Avatar
RM2738
RM2738 is offline
Posting Guru
Join Date: Sep 2010
Location: The Woodlands, TX
Posts: 2,200
RM2738 has a very good reputation on FTE.RM2738 has a very good reputation on FTE.RM2738 has a very good reputation on FTE.
Originally Posted by Laner View Post
What is the sq inches of area in that cross section vs a 3-1/2 or 4" round pipe?
Stock: 7.36"
3.5: 9.62"
4: 12.57"
 
  #12  
Old 10-26-2012, 05:06 PM
RM2738's Avatar
RM2738
RM2738 is offline
Posting Guru
Join Date: Sep 2010
Location: The Woodlands, TX
Posts: 2,200
RM2738 has a very good reputation on FTE.RM2738 has a very good reputation on FTE.RM2738 has a very good reputation on FTE.
5" is 19.63"

So with that stock down pipe, you're really restricting airflow. The cold side CAC pipe is similar in its restriction.
 
  #13  
Old 10-26-2012, 05:43 PM
StanleyZ's Avatar
StanleyZ
StanleyZ is offline
Postmaster
Join Date: Nov 2001
Posts: 3,468
StanleyZ is a splendid one to beholdStanleyZ is a splendid one to beholdStanleyZ is a splendid one to beholdStanleyZ is a splendid one to beholdStanleyZ is a splendid one to beholdStanleyZ is a splendid one to beholdStanleyZ is a splendid one to beholdStanleyZ is a splendid one to behold
Originally Posted by RM2738 View Post
Stock: 7.36"
3.5: 9.62"
4: 12.57"
I hope that math isn't based on that picture above. So what is the ID on a stock pipe? I can tell you I have plenty of power with the stock exhaust (absent the DOC/DPF). But if you want to drag race it then I guess changing the turbo back and the air box would help. Me, I'm just towing my trailer at 60MPH and I have more than enough power for that.
 
  #14  
Old 10-26-2012, 07:06 PM
RM2738's Avatar
RM2738
RM2738 is offline
Posting Guru
Join Date: Sep 2010
Location: The Woodlands, TX
Posts: 2,200
RM2738 has a very good reputation on FTE.RM2738 has a very good reputation on FTE.RM2738 has a very good reputation on FTE.
Originally Posted by StanleyZ View Post
I hope that math isn't based on that picture above. So what is the ID on a stock pipe? I can tell you I have plenty of power with the stock exhaust (absent the DOC/DPF). But if you want to drag race it then I guess changing the turbo back and the air box would help. Me, I'm just towing my trailer at 60MPH and I have more than enough power for that.
My math is calculated by imputing the image into AutoCad, tracing the image, scaling it based on the narrowest measurement that i took and the asking the software to calculate the area.
 
  #15  
Old 10-26-2012, 07:33 PM
RM2738's Avatar
RM2738
RM2738 is offline
Posting Guru
Join Date: Sep 2010
Location: The Woodlands, TX
Posts: 2,200
RM2738 has a very good reputation on FTE.RM2738 has a very good reputation on FTE.RM2738 has a very good reputation on FTE.
I can also tell you that power wasn't noticeable whatsoever. It was the EGT's that really improved after the DP was installed. With just a delete pipe, I could defuel at 1450 pretty easily. After a turbo back system, I rarely reach 1200 now before defueling because of boost PSI.
 

Thread Tools
Search this Thread
Quick Reply: turbo back exhuast or down pipe back?


Contact Us - About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: