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Old 01-15-2018, 12:47 PM   #1
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7.3 PSD interior noise questions

Hi all, long time lurker on the Sportsmobile forum and I just bought my first van for conversion. I am not sure if this is the right category to post, my questions is related to interior noise of the 7.3 PSD vs gas motors.

I recently picked up a 2002 Quigley 4x4 E350 extended 15 passenger with a 7.3 PSD and about 200k miles on it. The previous owner started to tear the passenger van apart and left it in a semi unfinished state.

I drove the van home and noticed the interior noise is quite loud, long distance travel at this noise level wouldn't be very pleasant. I put in my in-ear headphones and most of the noise of the motor were filtered out, so that made the long drive home much better. But I am not sure if it's missing interior sound insulation in the front end of the cabin to lead to this high noise level. I've read that the 7.3 is a noise monster, just wondering anyone with this motor has thoughts about the interior noise and how to combat it?

Anyone have a 7.3PSD van in Southern California willing to let me ride in their van to compare?

Thank you in advance!
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Old 01-15-2018, 01:28 PM   #2
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theres a few threads on the subject, but this is the first one i could find.

http://www.sportsmobileforum.com/for...use-19991.html
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Old 01-15-2018, 01:28 PM   #3
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... The previous owner started to tear the passenger van apart and left it in a semi unfinished state...
What type of noice are you hearing, exhaust noise, tire noise, engine noise? Depending on what was torn out, a bare metal van can be very loud inside, especially a diesel.

One thing to check is to see if the doghouse cover is installed correctly.


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Old 01-15-2018, 03:05 PM   #4
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Where are you in So Cal? (please consider adding location to your profile.)

I will be in SoCal later this week, Long Beach area. Thxs!
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Old 01-15-2018, 04:10 PM   #5
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I used a dynamate type material on the floor in the cab and footwells. I also removed the factory insulation on the doghouse and added a layer of Thermozite insulation. Any type would probably help (ultratouch, thinsulate).
This has helped a lot with the noise. Otherwise it's like riding in a beer can with a diesel.
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Old 01-15-2018, 04:38 PM   #6
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theres a few threads on the subject, but this is the first one i could find.

http://www.sportsmobileforum.com/for...use-19991.html
Thank you Shenrie, I will do some more searching and reading on the subject

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Where are you in So Cal? (please consider adding location to your profile.)

I will be in SoCal later this week, Long Beach area. Thxs!
Thanks for getting back to me, I am close to Long Beach. If you have some time to kill in an afternoon, I would love to see your van and buy you a beer!
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Old 01-15-2018, 04:42 PM   #7
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What type of noice are you hearing, exhaust noise, tire noise, engine noise? Depending on what was torn out, a bare metal van can be very loud inside, especially a diesel.

One thing to check is to see if the doghouse cover is installed correctly.


Herb
Thank you! I unlatched and relatched all the latches on the doghouse, but could be the stripping around it that not be sealing properly. I will definitely look into getting that redone.

The noise was definitely motor and/or possibly exhaust, when I coast on slower speeds, it gets significantly quieter. I've never owned a diesel, so I am not familiar with various notes in the Diesel symphony, though I am quite sensitive when listening to gas motors for issues.

Quote:
Originally Posted by saline View Post
I used a dynamate type material on the floor in the cab and footwells. I also removed the factory insulation on he doghouse and added a layer of Thermozite insulation. Any type would probably help (ultratouch, thinsulate).
This has helped a lot with the noise. Otherwise it's like riding in a beer can with a diesel.
Thank you! I will look into that as well.
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Old 01-15-2018, 06:42 PM   #8
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7.3PSD are loud?

that can't be possibly true...
LOL
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Old 01-15-2018, 07:02 PM   #9
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Easiest modification to reduce the noise would be swapping the engine.

But in all seriousness, check out cascade audios products sold at Zeronoise.com. lots of options for reducing engine/road noise.
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Old 01-15-2018, 07:51 PM   #10
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Easiest modification to reduce the noise would be swapping the engine...
A louder stereo is far simpler.


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