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Old 06-12-2019, 02:30 PM   #1
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Muffler delete 8.3 RE?

Has anyone straight piped an RE with one of the big 6's?

How did it play?

I am tempted but afraid that I may make it too loud.

I mentioned it to the gent that runs the local bus barn and he though i was nuts........
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Old 06-12-2019, 03:29 PM   #2
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Has anyone straight piped an RE with one of the big 6's?

How did it play?

I am tempted but afraid that I may make it too loud.

I mentioned it to the gent that runs the local bus barn and he though i was nuts........
As badass as I know itíll sound I have to agree that it will be loud AF. Youíd get tired of the noise after awhile.
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Old 06-12-2019, 06:01 PM   #3
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Maybe make two exhaust systems. One that bypasses the muffler, and another that goes through it?
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Old 06-12-2019, 06:31 PM   #4
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Maybe make two exhaust systems. One that bypasses the muffler, and another that goes through it?
Do an exhaust cutout! Best of both worlds and changeable.
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Old 06-12-2019, 06:41 PM   #5
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Do an exhaust cutout! Best of both worlds and changeable.
Great idea!
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Old 06-12-2019, 08:15 PM   #6
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With a rear engine setup the engine exhaust will only be loud to those behind you or bystanders along the way will hear it.
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Old 06-12-2019, 10:06 PM   #7
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I'm wondering if there is any benefit other than it sounds cool. With as big and long as that exhaust system is, I doubt deleting the muffler adds any noticeable power. If those who say it does were using a Butt dyno, they are notoriously inaccurate. As many of us that complain about how loud our bus is under normal operation , why would you want to make it louder. I'm all into a powerful sounding exhaust on my rides, my bus I'd like to keep as quiet as possible.
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Old 06-12-2019, 11:15 PM   #8
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I have done a muffler delete on my 8.3 RE bluebird. The only way I can hear the thing is if I open the windows! Closed I don't hear it. It runs a little better now. The turbo spools up faster. I don't know what the other motorists think.
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Old 06-13-2019, 07:19 AM   #9
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I'm wondering if there is any benefit other than it sounds cool. With as big and long as that exhaust system is, I doubt deleting the muffler adds any noticeable power. If those who say it does were using a Butt dyno, they are notoriously inaccurate. As many of us that complain about how loud our bus is under normal operation , why would you want to make it louder. I'm all into a powerful sounding exhaust on my rides, my bus I'd like to keep as quiet as possible.
A free flowing exhaust increases power and economy. It also lowers the exhaust gas temps since the turbo is spooling up better without the restrictions. I straight piped my front engine bus and it is no louder in the front of the bus, just the exhaust tone is much better and louder out the back.......

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Old 06-13-2019, 08:52 AM   #10
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Smile

Steve,

You should definatly straight pipe it and let me know how it works! Maybe an exhaust brake as well....bah... bah... bah... bah... bah.

Ted
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Old 06-13-2019, 10:53 AM   #11
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Quote:
Originally Posted by Johnny Mullet View Post
A free flowing exhaust increases power and economy. It also lowers the exhaust gas temps since the turbo is spooling up better without the restrictions. I straight piped my front engine bus and it is no louder in the front of the bus, just the exhaust tone is much better and louder out the back.......



the exhaust sounds great and is little louder, if any, than the sounds that the car tires make when passing the camera
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Old 06-13-2019, 12:05 PM   #12
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Quote:
Originally Posted by Johnny Mullet View Post
A free flowing exhaust increases power and economy. It also lowers the exhaust gas temps since the turbo is spooling up better without the restrictions. I straight piped my front engine bus and it is no louder in the front of the bus, just the exhaust tone is much better and louder out the back.......

All true, but are you making it flow any freer than it was before? The large diameter and length make that free flowing. There is a limit where it starts to become detrimental. Diameter of pipe and length make huge changes in the power band of a motor. It won't happen, but I'm not believing any gains are had until I see a dyno sheet. Spend 20 years racing and developing exhaust systems that work.
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Old 06-13-2019, 12:12 PM   #13
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All true, but are you making it flow any freer than it was before? The large diameter and length make that free flowing. There is a limit where it starts to become detrimental. Diameter of pipe and length make huge changes in the power band of a motor. It won't happen, but I'm not believing any gains are had until I see a dyno sheet. Spend 20 years racing and developing exhaust systems that work.


would be easy to check any difference with a stop watch - ( $5.95 ) using familiar land marks
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Old 06-13-2019, 01:03 PM   #14
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I did mine, way too loud if something was on my right side. I found a 4 inch glasspack that made it just right.
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Old 06-13-2019, 01:33 PM   #15
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I did mine, way too loud if something was on my right side. I found a 4 inch glasspack that made it just right.
That is what I was afraid of.

The exhaust pretty much consists of a large muffler with the inlet and outlet on the same side. A sweep comes down from the turbo to the muffler and another sweep that turns it to the rear. Then about 4' straight out the back.

Not a whole lot to work with. Not sure what was meantby " With as big and long as that exhaust system is"??

If I can take off straight of of the "turbo sweep" I can go straight out the curb side right behind the drive tires. That would allow for a muffler about 32" long.

How long is your glasspack?
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Old 06-13-2019, 01:53 PM   #16
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I think the body is about 2 feet 30 inches at most. After the down sweep is the flex bellows then muffler then straight out the side. Whole exhaust system is at most 8 feet after the turbo.
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Old 06-13-2019, 02:00 PM   #17
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Cool bus! Itís definitely loud as s*it though!
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Old 06-13-2019, 03:19 PM   #18
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That is what I was afraid of.

Not sure what was meantby " With as big and long as that exhaust system is"??
4" pipe 20' long is as free flowing as you're going to get. I'm not familiar with the RE exhaust system, but it's got to be 20' shorter. and the performance is no different.
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Old 06-13-2019, 05:43 PM   #19
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Steve, me being me, I searched for quite a while for a straight muffler with 4in and 4 out that I thought wasn't over priced, this is the muffler I bought.

https://www.ebay.com/itm/One-Diesel-...UAAOSwPAxaOojY

Still a bit loud but not objectionable, at least to me.
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