6.0L Power Stroke Engine and DrivetrainDiscussion of the 6.0L Power Stroke diesel engine and drivetrain in the 2003-Up Super Duties and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 6.0L Power Stroke engine.
So I have a question. I "had" a programmer and custom tunes from a good compnay but I most drive in stock and pull 100% stock.
I am thinking of getting an exhaust to help get the temps down when pulling our 5er.
My question, is it safe to run a 4" turbo back on a stock engine? The reason I am asking, is that a Ford PSD Tech told me that if I do that I will get less back pressure which then forces the CPU to inject more diesel and thus I will get lower MPG's.
What do ya think?
Thanks
RR
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2006 F250 King Ranch PSD, ARP Head Studs, EGR Delete, 4" Turbo Back no cat
You might want to find a new mechanic. Less back pressure is better for the turbo. It allows the turbo to spin more freely. Any decrease in fuel efficiency is due to the extra power available via your foot on the pedal with a free flowing exhaust.
So I have a question. I "had" a programmer and custom tunes from a good compnay but I most drive in stock and pull 100% stock.
I am thinking of getting an exhaust to help get the temps down when pulling our 5er.
My question, is it safe to run a 4" turbo back on a stock engine? The reason I am asking, is that a Ford PSD Tech told me that if I do that I will get less back pressure which then forces the CPU to inject more diesel and thus I will get lower MPG's.
What do ya think?
Thanks
RR
I think it's illegal in all 50 states if you don't leave the cat in. You also need at least an EGT gauge (pre-turbo). And there is a EBP sensor that may give you a CEL.
Put a 4" cat back on it and gauges. Trans temp, boost, EGT & fuel pressure, and don't look back.
OMC
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Feb 03 6.0 Silver F-250 SD SC XLT long box, 6-spd 3.73ls, Fx4, Stock, Spray-in liner, Contico box.HARPOONED.
Installed an MBRP 4" Turbo back, kept cat & used supplied muffler, 25k ago, and no issues. Lowered post turbo EGTs 50-100'. Tech that works on truck regularly agrees that this one of the best modes for the overall well being of the motor.
Having a cat back will still slightly reduce backpressure, and thus reduce EGTs....But not as much as a turbo back exhaust system.
A cat back system includes the piping from the catalytic converter back, where as the turbo back system deletes the stock catalytic converter and replaces the whole exhaust system with new piping. You can also get turbo back systems that re-use your stock catalytic converter, these might be your best bet.
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2006 F250 cc/sb sct, studs egr delete, 100 shot injectors, fass fuel pump, twins, rough country 4-link 8" Lift, 38"x15.5" Dick Cepeks, 20x12 Rockstars, 4" Dual Exhaust, Ranch hand bumpers Front & Rear
I did the turbo back 4 in silverline and I gained about 2mpg if I am driving nicely and lower temps. I would do it again forsure. I was told the same thing about the back presure bit and I think it is a load of cr**. I have only seen good from my install.
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Ford f350 6.0 4x4. 4" silverline turbo back, cold air intake, six speed manual tranny, sct x3, 373 rear end, running full synthetic in every part that takes oil.
it will void your warranty but its worth it. just keep your cat and slap it back on if u need to go to the dealer for anything major, like head gaskets.
Having a cat back will still slightly reduce backpressure, and thus reduce EGTs....But not as much as a turbo back exhaust system.
A cat back system includes the piping from the catalytic converter back, where as the turbo back system deletes the stock catalytic converter and replaces the whole exhaust system with new piping. You can also get turbo back systems that re-use your stock catalytic converter, these might be your best bet.
Thanks for all the replies, is keeping the stock Cat with a turbo back enough to lower the temps still yet staying legal and not affecting warranty issues?
If I did a Cat back does that really do anything?
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2006 F250 King Ranch PSD, ARP Head Studs, EGR Delete, 4" Turbo Back no cat
As for being illegal without a catalytic converter, well - it depends on your state and county of residence. If you desire a true high flow exhaust with a catalytic converter ( for emissions reasons), then you can also spend a few hundred more for a 4 inch converter!
In the warranty department - you are likely on your own! Replacing the cat and anything before it will likely void your warranty! If someone at the dealer says that it won't void the warranty - then get it writing and signed by the manager! Good Luck!
As for being illegal without a catalytic converter, well - it depends on your state and county of residence. I
GC
Sorry, This is NOT TRUE! Removal or tampering with an installed emissions device is a violation of the FEDERAL Clean Air Act, and if you take the cat out, you LEGALLY have a vehicle that can only be used at the drag strip, a tractor pull or on a farm or private ranch. You cannot legally register it for use on a public road, street or highway.
HOWEVER, enforcement is up to each state, and is lax or non-existent in most states, except California, where its about to get stiffer.
OMC
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Feb 03 6.0 Silver F-250 SD SC XLT long box, 6-spd 3.73ls, Fx4, Stock, Spray-in liner, Contico box.HARPOONED.
It will still do a lot even if you leave the cat in. The exhaust muffler in the factory exhaust is verry restrictive. And even doing a cat back will give you better performance, but turbo back will do even better, and turbo back without the cat better yet. It is not that hard to take the whole cat in and out if needed, but it is illegal to tamper with it, but I dont really see any feds going arround busting people for it. I think the main thing is if you have to get warranty work done you will want it in there or your warranty will be voided. Hope this helps.
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Ford f350 6.0 4x4. 4" silverline turbo back, cold air intake, six speed manual tranny, sct x3, 373 rear end, running full synthetic in every part that takes oil.
mt454casull has got it right...Anything is better than the stock setup, of course you'll see better results with a turbo back, and even a turbo back with the cat. But a cat back will be the cheapest, and it will still give you a nice sound and help cooling and overall performance.
Tampering with the catalytic converter is a federal crime and carrys a very harsh penalty....But most states dont enforce it...
Heres some things to think about:
Is it illegal to remove the cat? Yes
Will you get in trouble for removing it? Very, I mean very unlikely.
Will you pass inspection without it? No
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2006 F250 cc/sb sct, studs egr delete, 100 shot injectors, fass fuel pump, twins, rough country 4-link 8" Lift, 38"x15.5" Dick Cepeks, 20x12 Rockstars, 4" Dual Exhaust, Ranch hand bumpers Front & Rear
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warranty department - you are likely on your own! Replacing the cat and anything before it will likely void your warranty! If someone at the dealer says that it won't void the warranty - then get it writing and signed by the manager! 
Good Luck!
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