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Just put a walker btm on an otherwise stock 2001 van. I used the stock muffler hangers the system is well hung lol
This van never had a cat.
Pretty quiet in park or neutral
Put it in gear the couple rpm drop it starts droning lightly.
Goes away as I accelerate
It returns at around 60 in od with tc locked. And goes away as I pass through that speed. Its OK but not when traffic is going 60
It seems to be coming from my mid pipe.
It seems like it happens at say 750 and 1500rpm (guess no tach)
I have a magnaflow 3.5" truck downpipe waiting on install, either behind a kc, or with a beans van turbo flange adapter, to go full 3.5"
I was torn between the btm which has no packing, and an afe 3.5" straight through with packing. I wanted it quiet. My brother has an afe 4" and its not quiet so I decided to try btm.
Now my thoughts are,
1. Try turning my btm around
(Free but pita as my hangars are welded)(also walker said it probably wont do much)
2. Install the 3.5 dp and see what happens (hey maybe it will change the drone or make it go away)
3. Buy that afe and install it in the mid pipe where the cat normally goes (i worry about burning the packing)(maybe it will be really quiet)
4. Put a resenator in the mid pipe (this is what they are for eh?)
I have a 4" pipe from headers to behind the rear wheel.
when I bought the Excursion, some idiot had glued a small muffler, like a Ford Fusion or Escort would use ?? and the exhaust pipe looked like 2.5 inches, and they deleted the tailpipe totally. Left the exhaust pointed at the RR shock.
the whistle that thing made was horrible, I stopped at a rural muffler shop and had them replace it with a new 4" pipe, front to rear.
After a year of listening to the drone at certain speeds, I installed a Walker Big Truck muffler on it, no more noise, and no performance hit.
what diameter pipe is on your truck?
I think it is too small in diameter???
I have a 4" pipe from headers to behind the rear wheel.
when I bought the Excursion, some idiot had glued a small muffler, like a Ford Fusion or Escort would use ?? and the exhaust pipe looked like 2.5 inches, and they deleted the tailpipe totally. Left the exhaust pointed at the RR shock.
the whistle that thing made was horrible, I stopped at a rural muffler shop and had them replace it with a new 4" pipe, front to rear.
After a year of listening to the drone at certain speeds, I installed a Walker Big Truck muffler on it, no more noise, and no performance hit.
what diameter pipe is on your truck?
I think it is too small in diameter???
btm install isnt the same on a van as a truck
i didnt modify much. other than shortening the over axle section. Ill double check for contact. Im also wondering if I've got too much hangar load on one hangar or something and its causing my floor to drum and transmit. It does seem like its coming from mid/down pipe. Perhaps ill put an Aeroturbine there.
Looking at your video, there is a lot going on back there with your hangars.
Exhaust hangers need to be able to swing aft as the exhaust system "grows" with heat.
The metal expands when hot, and the cumulative expansion of the entire exhaust tract can end up adding up to perhaps as much as a 3/8" in overall length at the end of the vehicle, depending on system length, material mass, and EGT.
So in addition to jiggling and wiggling from engine vibration, as well as road and suspension induced chassis vibration, the hangar donuts are also designed to absorb and swing with expansion.
What you described in your video about your old exhaust system, which wasn't shown, seemed in error.
You described a stock muffler with a low side entry, and a low side exit, where most Ford truck and van mufflers have a low side entry, and a high side exit, to reduce the severity of the first radius bend of the tail pipe's journey over the rear axle. I'm not sure if your prior exhaust system was bone stock, so I'm not picking a bone with you on your verbal description.
However, the area where you were laying and pointing the camera toward is right where the main hangar donuts (that become swingers when things get hot) are located, and the end result that you presented appears "bound up" as best as can be perceived via video. It seems as if your modified exhaust system is not as free to swing to the rear as what can be seen in OEM exhaust system support designs.
Whether this perception has any bearing on the drone that you hear, or any bearing at all for that matter, can only be determined in person.
You've been a member of FTE long enough to have perhaps stumbled across another 7.3L diesel E-350 VAN owner whose FTE username is @FinnishStroker .
He installed a Walker Big Truck Muffler in his van, located in Finland. He did not install the type of Walker muffler that John in Okieland had installed and shared pics of upthread, which with all those tubing patch welds, doesn't even look like a "direct fit". No. Finnishstroker installed a true BTM... and he chose a 5" in/out.
The Walker BTM part number Finnishstroker installed in his 2000 E-350 van was 22920.
Driving with 5"straight pipe,in a town or short trips is cool as is gets..But driving with 5"straight pipe for 15 hours in a week,is..Not so cool anymore..
Did the research and 5.9 and big rig guys have used this with good success.This is the cheapest,so called school bus muffler.
Originally Posted by FinnishStroker
have you driven with a 7.3 VAN,
with 5"stainless straight pipe?
1000 miles per week,for 2 months?
Body of a van resonates way more than pickup..
Heads up...That video above is more to showcase his van reaching a half million miles, then muffler drone. See the four additional videos further below, in particular the last two "drive by" videos to get a better idea of how this BTM sounded in his van.
Here is the BTM installed in the van... right away you will recognize the transmission crossmember and midship fuel tank as van-esque.
That last photo is of the rear of the then newly installed BTM muffler, but Finnishstroker does not show the hangar donut arrangement.
However, interestingly enough, Finnishstoker did say this about his hangars, after installing the BTM....
Originally Posted by FinnishStroker
Did some work at hangers,took some photos of muffler.
Not happy with rubber hangers,extra weight of muffler does not help either..Going to upgrade with polyurethane ones..
Here are videos of what Finnishstroker's BTM "Drone" sounded like...
Ultimately, it sounds like Finnishstroker removed the Walker BTM altogether...
Originally Posted by FinnishStroker
Muffler is going back in soon.
Hopefully, FinnishStroker will be awakened by these quotes and tag, and return from his year long absence from FTE to offer you some exhaust tips specifically tailored to the E-Series 7.3L diesel van.
I was also wondering about pipe contact. My downpipe contacted the firewall during the initial T4 kit install. It was obnoxious under certain load conditions and completely gone at other times.
I would chase this and the hanger load possibility first.
In your video, the curved section over the axle looks a bit close to something above it. If the pipe moves around some when it grows or twists under load maybe this could be a contact point?
Looking at your video, there is a lot going on back there with your hangars.
Exhaust hangers need to be able to swing aft as the exhaust system "grows" with heat.
The metal expands when hot, and the cumulative expansion of the entire exhaust tract can end up adding up to perhaps as much as a 3/8" in overall length at the end of the vehicle, depending on system length, material mass, and EGT.
Hopefully, FinnishStroker will be awakened by these quotes and tag, and return from his year long absence from FTE to offer you some exhaust tips specifically tailored to the E-Series 7.3L diesel van.
One of the best researched posts I've ever seen! Kudos!
Looking at your video, there is a lot going on back there with your hangars.
Exhaust hangers need to be able to swing aft as the exhaust system "grows" with heat.
The metal expands when hot, and the cumulative expansion of the entire exhaust tract can end up adding up to perhaps as much as a 3/8" in overall length at the end of the vehicle, depending on system length, material mass, and EGT.
So in addition to jiggling and wiggling from engine vibration, as well as road and suspension induced chassis vibration, the hangar donuts are also designed to absorb and swing with expansion.
What you described in your video about your old exhaust system, which wasn't shown, seemed in error.
You described a stock muffler with a low side entry, and a low side exit, where most Ford truck and van mufflers have a low side entry, and a high side exit, to reduce the severity of the first radius bend of the tail pipe's journey over the rear axle. I'm not sure if your prior exhaust system was bone stock, so I'm not picking a bone with you on your verbal description.
However, the area where you were laying and pointing the camera toward is right where the main hangar donuts (that become swingers when things get hot) are located, and the end result that you presented appears "bound up" as best as can be perceived via video. It seems as if your modified exhaust system is not as free to swing to the rear as what can be seen in OEM exhaust system support designs.
Whether this perception has any bearing on the drone that you hear, or any bearing at all for that matter, can only be determined in person.
You've been a member of FTE long enough to have perhaps stumbled across another 7.3L diesel E-350 VAN owner whose FTE username is @FinnishStroker .
He installed a Walker Big Truck Muffler in his van, located in Finland. He did not install the type of Walker muffler that John in Okieland had installed and shared pics of upthread, which with all those tubing patch welds, doesn't even look like a "direct fit". No. Finnishstroker installed a true BTM... and he chose
Re muffler install, exhaust was factory Virgin.
As stated s pipe already runs down to top inlet of muffler, and exit of muffler is on bottom, so the only way to make it work is shortening the over axle part as I did.
Ok so road test, didn't get enough freeway due to traffic.
it seems to have improved to a liveable level. Its still there, probably will add a standard resenator when I swap in the 3.5" down pipe.
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