Straight piping damaging turbo? - Ford Powerstroke Diesel Forum
 2Likes
  • 1 Post By '01SilverBullet
  • 1 Post By Jjorgis5569
 
LinkBack Thread Tools Display Modes
post #1 of 7 Old 11-19-2013, 06:41 PM Thread Starter
Powerstroke.org Rookie
 
Join Date: Nov 2013
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Straight piping damaging turbo?

Hello, I have searched long and hard, but perhaps not in the right places, or not long enough, or hard enough... Whatever the case may be, if the answer is already either on this site or out on the internet somewhere, then I apologize for wasting your time.

So here's the story, I'll keep it as short as I can. I bought my truck, being a '99 F-350 7.3. I drove him, worked him, and loved him for quite a while. Shortly after I bought it I straight piped it. I left the original downpipe on, made a bracket to support the end, and added a cheap 45 degree elbow to direct a little exhaust out, for whatever good it did. LOVED IT! Between the DIY 6637 and straight piping it, the turbo spooled faster, at less RPMs, felt like more boost (no gauges or scan tool at the time sadly), more power, less fuel consumption, beautiful sound like angels and gods singing together, blah blah blah. Never a problem (aside from starting the engine in a sleeping neighborhood...).

Took a job hauling horses across the country. Ran well, but the construction company that owned the truck before me ran the engine out of oil several times. The engine finally gave out, and I replaced it with a brand new from-Ford engine. Did the swap myself. Made a few trips, put several thousand miles on the engine with no problems until I was coming home on the last load for that group and I started blowing smoke, not much at first, then more.

Anyway, the turbo came apart on the exhaust side THANKFULLY, and sprayed oil in the exhaust. Took it to Ford for the warranty and they got it replaced at no cost to me. Then the tech pulled me aside and said "We weren't supposed to warranty the turbo because part of the exhaust system is removed."

His explanation almost made sense, enough to scare me from straight piping it again even after the warranty ended because IF he's right, I can't afford a new turbo. According to him, straight piping it increases flow but puts too much pressure on the turbo straight out, wearing/damaging the bearings due to increased load... in other words too much force perpendicular to the shaft instead of flowing around it. Without conducting an in-lab test on a dissected 7.3, it almost makes sense except for one glaring fact: My previous stock turbo with almost 200,000 miles on it never gave me a problem no matter how high, hot, or fast the exhaust was pouring out. Also, tons of 7.3 owners straight pipe their engines from stock DP to 5 inch high-flow hoopy-do mirror finish DPs.

I think the dealerships are full of... baloney, but again I can't take a chance on ruining my turbo at least until I have a spare sitting in a box in case they speak the truth.

Your thoughts? Expert opinions and scientific explanations are preferred, I don't care if you prove or disprove the stated concept, I just want to know. Also if you know of a place where Ford ACTUALLY STATES it as a fact rather than a tech and a former tech that I trust, that would be great.

I want to free up the engine load by straight piping not only to get more power in reserve and better MPG, but less wear and tear overall performing the same task. Not at the expense of a turbo though.

I'm open to all of your thoughts and humbly appreciate all advice you can offer.

Thanks in advance!

'99 F-350 7.3 Powerstroke, 6 Speed manual, 4X4.
Arctic Driver is offline  
Sponsored Links
Advertisement
 
post #2 of 7 Old 11-19-2013, 06:46 PM
Compression Ignition Addict
 
blue99stroker's Avatar
 
Join Date: Oct 2011
Location: Chico, California
Posts: 6,108
Thanks: 18
Thanked 285 Times in 275 Posts
Mentioned: 30 Post(s)
Quoted: 393 Post(s)
Garage
Feedback Score: 0 reviews
straight piping it will have no bad side effects.

that guy is full of baloney.

it is actually easier on the motor, the stock muffler is restrictive and just puts more load on the engine.

putting the turbo out of its efficiency range will definately damage it over time. but it takes lots of miles to do this.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
99.5 f250 7.3 4x4 279k FF 160/30, Hydra w/SDK Tunes, S&B, 4" Exhaust, Van Turbo w/Riffraff Billet Wheel, Autometer Gauges, Built trans, 08 Tow Mirrors, Trucool Max.

Dad- 2000 F250 7.3 4x4 124k Autometer Gauges, Superchips 1705 (Tow Safe), K&N Intake w/Amsoil Filter, 4" Exhaust, BD Billet Wheel, Trucool Max, Modified VB, 08 Tow Mirrors.
blue99stroker is offline  
post #3 of 7 Old 11-19-2013, 06:57 PM
Compression Ignition Addict
 
'01SilverBullet's Avatar
 
Join Date: Jul 2010
Posts: 475
Thanks: 1
Thanked 5 Times in 4 Posts
Mentioned: 0 Post(s)
Quoted: 4 Post(s)
Feedback Score: 0 reviews
That straightpipe has no effect on the turbo whatsoever. It was more likely than not, a defective unit from the factory, that does happen on occasion.

Think about all the straightpiped diesel pickups and semi tractors on the road. If not having a muffler hurt anything, they wouldn't be doing it.

So, in short, the dealer was feeding you a line of BS, plain and simple.
cadd likes this.

2001 F250, 7.3, Automatic, 4x4, 33's, Leveled, Cobra 29 CB Radio, Single Firestick anteanna, Pioneer Head Unit, Riffraff 6637 Intake Kit, 4" turbo-back straight pipe, Dual Alternator Upper Radiator Hose, AutoMeter Boost, Pyro, Trans Temp, CM RD Flatbed with Gooseneck and Rear Hitches...and a heavy right footed driver...
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


Wishlist: 160cc single shots, GT38r, BTS, SRP 1.1
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


REAL TRUCKS DON'T NEED SPARKPLUGS!!

Lord, please take care of this drivin' fool...
'01SilverBullet is offline  
Sponsored Links
Advertisement
 
post #4 of 7 Old 11-19-2013, 07:23 PM Thread Starter
Powerstroke.org Rookie
 
Join Date: Nov 2013
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Thanks to both. I was 99.84% sure that there was no risk, especially considering all the 7.3s running straight piped with no problems (myself included on the original engine). Even looking at the design of the exhaust side turbine, it seems that if the turbo is compressing more than it should, that is what the wastegate is there for. I'm not worried about the engine/valves pre-turbo since the turbine creates it's own backpressure. Once I'm done with this move and have a better job again I will free the engine once again.

Has anyone other than myself heard someone claim that lack of backpressure damage the turbo? (Just trying to be extra extra sure. A major break down would break me.)

Thanks!

'99 F-350 7.3 Powerstroke, 6 Speed manual, 4X4.
Arctic Driver is offline  
post #5 of 7 Old 11-19-2013, 09:42 PM
Serving Our Country!
 
JSchuricht's Avatar
 
Join Date: Aug 2007
Location: Arizona
Posts: 2,981
Thanks: 0
Thanked 27 Times in 26 Posts
Mentioned: 1 Post(s)
Quoted: 0 Post(s)
Feedback Score: 2 reviews
The only way the exhaust can cause turbo damage is if the exhaust isn't properly secured to the chassis and is hanging off the turbo. The weight and vibration could break something over time. As for the back pressure, it's a non issue. You can take a 90 and run it from the turbo right out of your hood without causing any damage.
JSchuricht is offline  
post #6 of 7 Old 11-21-2019, 03:51 AM
Serving Our Country!
 
alaskan155's Avatar
 
Join Date: Mar 2013
Posts: 1,333
Thanks: 12
Thanked 67 Times in 66 Posts
Mentioned: 2 Post(s)
Quoted: 111 Post(s)
Feedback Score: 1 reviews
will say after running a straight pipe/6637 for 80k miles, my turbo finally gave out at 233k....


the mechanic is partially right, with the 6637 and 4" straight pipe the stock turbo issue is surge when towing and running a tune. the turbo will start cha cha cha going up steep hills unless you drop a gear and that will kill it in short order so i would recommend changing to a wicked wheel/better housing.

what finally killed mine i think is the combination of stage 1 single shots and the bellowed up-pipes not leaking compared to the stock.

2002 F250 7.3/JW Tow master 4r100 223k miles
Mods:explorer heater valve, WR GP relay, RiffRAff boots, lariat overhead console, Hydra chip, 6637 mod, 6.0 cooler, AIH/EBPV delete, CNCfab HPx and isspro2 trans, egt, and boost gauges. 92 gallon aux tank with a total capacity of 130gallons, 1800 mile range
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
, 4" MBRP straight Piped. 2" Warrior shackles, Redhead steering box
DLR
alaskan155 is offline  
post #7 of 7 Old 11-21-2019, 03:01 PM
Premium Member
 
Jjorgis5569's Avatar
 
Join Date: Feb 2019
Posts: 267
Thanks: 10
Thanked 28 Times in 26 Posts
Mentioned: 3 Post(s)
Quoted: 70 Post(s)
Feedback Score: 0 reviews
A straight pipe will lose some torque on the lower end of your power band, but on a diesel that isnít an issue. I work with turbines on a daily basis-basically a turbo but with 6 axial stages and one centrifugal stage on the compressor for an Allison c20. The ďexhaustsĒ are literally a few inches long, so letís call that a straight pipe. If we were to decrease the pipe diameter, the result would be higher TOT (EGT as itís known here), which would cause a compressor stall (interruption of airflow over compressor blades when the supplied airflow cannot meet the airflow needed). Thatís the semi scientific explanation. Basically the air becomes turbulent, and can even reverse direction.
More restriction=more stress

Itís my long winded way of saying the tech is full of it, but I can back up my explanation with physics and real world experience.
MSM likes this.
Jjorgis5569 is offline  
Sponsored Links
Advertisement
 
Reply

Tags
straight pipe , turbo damage , warranty

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










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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On

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