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Upgrades and Aftermarket - 6.0L Engine Upgrading or adding OEM or aftermarket equipment to your 2003-Up Super Duty or Excursion with 6.0L Power Stroke diesel engine. Please confine discussion of topics in this forum to those items that are specific to the 6.0L Power Stroke engine.

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Old 12-11-2012, 09:19 PM   #1 (permalink)
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bullet proof exhaust

Has anybody tried the exhaust from bullet proof? I am looking at doing a 4 inch turbo back. I have been looking at banks i do not want anymore noise in the cab. I know a lot of people here are going MBRP but i am looking for a quiet ride and still moving air.
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Old 12-12-2012, 07:20 PM   #2 (permalink)
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Run an MBRP downpipe, leave the OEM muffler and cat installed. Cheaper and works just fine.

The OEM downpipe is 3" while the tubing is 3.5" at the cat. The extra .5" on the 4" doesn't do much for flow.
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Old 12-12-2012, 07:59 PM   #3 (permalink)
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Thanks i never thought of that. That might work are you currently running that.
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Old 12-12-2012, 08:11 PM   #4 (permalink)
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A 4" pipe is 30% bigger than a 3.5" pipe...so it does flow easier.
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Old 12-12-2012, 08:12 PM   #5 (permalink)
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I run a straight pipe setup. MBRP down pipe, cat delete pipe on OEM tubing with the muffler deleted. Sounds great when the Pmax turbo starts to work. At lower RPMS 1100-1500 the whistle is what turns heads. On the HWY I'm running 1880+ @ 70+MPH and the truck sounds quiet. She really barks when I get it up to 2500+ RPMs with a nice V8 rumble. I love it!!!
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Old 12-12-2012, 08:15 PM   #6 (permalink)
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Originally Posted by COBRAJET View Post
A 4" pipe is 30% bigger than a 3.5" pipe...so it does flow easier.
Rate of flow hasn't changed unless you swap in a larger turbo and are pushing it. Since air can compress the pipe diameter doesn't mean squat with .5" difference on an OEM turbo.

Now double the output of the turbo (say Non-VGT) then you may have a difference worth the extra .5" of piping. Besides the cost it doesn't add up for some people with no performance plans.
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Old 12-12-2012, 08:19 PM   #7 (permalink)
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Quote:
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Rate of flow hasn't changed unless you swap in a larger turbo and are pushing it. Since air can compress the pipe diameter doesn't mean squat with .5" difference on an OEM turbo.

Now double the output of the turbo (say Non-VGT) then you may have a difference worth the extra .5" of piping. Besides the cost it doesn't add up for some people with no performance plans.
You're theory is dead wrong! The largest pipe that one can place on the outlet of the turbo is the best pipe. The least back pressure in the exhaust system is the best option... always...regardless of what you do to the turbo. It is simple physics taught to every engineering student.
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Old 12-12-2012, 08:33 PM   #8 (permalink)
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Originally Posted by COBRAJET View Post
You're theory is dead wrong! The largest pipe that one can place on the outlet of the turbo is the best pipe. The least back pressure in the exhaust system is the best option... always...regardless of what you do to the turbo. It is simple physics taught to every engineering student.
WOW....keep drinking the kool-aid. SO why hasn't anyone built a 5" down pipe then??
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Old 12-12-2012, 08:41 PM   #9 (permalink)
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WOW....keep drinking the kool-aid. SO why hasn't anyone built a 5" down pipe then??
Because it doesn't fit. It's not Kool--Aid...it's simple engineering. No back pressure is needed on the outlet of a turbine. It does nothing but slow down the spooling. Go to the track and look at all the turbo cars. Most have a 1 to 2 foot exhaust pipe as big as they can get it....there's a reason. Go google it....I teach enough engineering to my students...not going to do it here for free.
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Old 12-12-2012, 08:49 PM   #10 (permalink)
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Because it doesn't fit. It's not Kool--Aid...it's simple engineering. No back pressure is needed on the outlet of a turbine. It does nothing but slow down the spooling. Go to the track and look at all the turbo cars. Most have a 1 to 2 foot exhaust pipe as big as they can get it....there's a reason. Go google it....I teach enough engineering to my students...not going to do it here for free.
Doesn't fit?? LOL...It will fit just need to massage the firewall.
The reason the exhaust pipe on drag cars is so short and big is VOLUME and rate of airflow. If the pipe was longer the pressure would build. Additionally if the pipe were smaller in diameter it would increase pressure. The EBP sensor is PRE- downpipe so it's reading pressure at the manifolds.

Our turbos don't FLOW out enough to make a difference between 3.5" and 4" piping. You might teach engineering but you don't know squat about real world diesel performance.

If you can't explain it here then you just don't know what your talking about at all.
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Old 12-12-2012, 08:51 PM   #11 (permalink)
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Doesn't fit?? LOL...It will fit just need to massage the firewall.
The reason the exhaust pipe on drag cars is so short and big is VOLUME and rate of airflow. If the pipe was longer the pressure would build. Additionally if the pipe were smaller in diameter it would increase pressure. The EBP sensor is PRE- downpipe so it's reading pressure at the manifolds.

Our turbos don't FLOW out enough to make a difference between 3.5" and 4" piping. You might teach engineering but you don't know squat about real world diesel performance.

If you can't explain it here then you just don't know what your talking about at all.
I already explained it...you don't like the answer. I'm done...good day
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Old 12-12-2012, 08:53 PM   #12 (permalink)
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Since you can't address a back pressure measurement at the turbine outlet of the turbo I understand your inability to continue your argument.
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Old 12-12-2012, 09:05 PM   #13 (permalink)
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Tech Article - Turbine housings, exhaust sizing, and back pressure. - Evans Tuning

Pay close attention to the first sentence...it appears you need to understand this before going any further. The goal of any turbine is to have zero back pressure on the outlet.
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Old 12-12-2012, 09:14 PM   #14 (permalink)
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Just the first sentence huh?? LOL

That whole article states EXACTLY what I've been saying.

And you still have yet to show any REAL numbers you have collected on our OEM turbos.
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Old 12-12-2012, 09:15 PM   #15 (permalink)
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You really think your stock 6.0 exhaust system has zero back pressure?
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