Road and Engine noise test - Let's measure - Defender Source
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  #1  
Old December 17th, 2009, 11:46 AM
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Carl Jonsson
1995 NAS D90 #219
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Road and Engine noise test - Let's measure

I thought I'd move this into its own thread because I don't think its been done before. For anyone who has an iPhone and a Defender, or better yet, a Decibel meter and a Defender, let's measure the cabin noise levels and compare. For $1 there is a great iPhone app called Decibel: http://www.gadgetfrontier.com/ The more people who do this, the better.

I did a quick measure this morning on my short trip to work (see below), I plan to do it again after I finish soundproofing (still have roof, bonnet and a couple of other spots left) and I'm also going to test the wife's car to get a "normal" car comparison. For anyone who does not yet have soundproofing but plan on getting it I'd encourage you to test before and after just to get an idea of who effective it is. The iPhone microphone only does up to a 100 dB.

D90 300tdi (with partial soundproofing):

Idle: 61 dB
City: 75 dB
Freeway: 85 dB

Here's a good comparison chart:

Weakest sound heard: 0dB
Whisper Quiet Library: 30dB
Normal conversation (3-5'): 60-70dB
Telephone dial tone: 80dB
City Traffic (inside car): 85dB
Train whistle at 500', Truck Traffic: 90dB
Subway train at 200': 95dB
Level at which sustained exposure may result in hearing loss: 90 - 95dB
Power mower at 3': 107dB
Snowmobile, Motorcycle: 100dB
Power saw at 3': 110dB
Sandblasting, Loud Rock Concert: 115dB
Pain begins: 125dB
Pneumatic riveter at 4': 125dB
Even short term exposure can cause permanent damage - Loudest recommended exposure WITH hearing protection: 140dB
Jet engine at 100', Gun Blast: 140dB
Death of hearing tissue: 180dB
Loudest sound possible: 194dB
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  #2  
Old December 17th, 2009, 11:51 AM
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Marc
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This is on a SW correct?
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  #3  
Old December 17th, 2009, 12:13 PM
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Daniel Marcello
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This is going to be awesome. I'll test mine this weekend. Where did you put the iPhone in the car?
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  #4  
Old December 17th, 2009, 12:23 PM
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Shane
D90SW 1997
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Just downloaded. I'm going to place on my passenger seat. The center console (cup holder or coin tray) would pick up too much noise from the tunnel. On or in the dash would pick up too much as well and wouldn't be a fair measurement.
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  #5  
Old December 17th, 2009, 12:45 PM
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If you have the iPhone athletic arm strap thing, you could wrap the strap around the passenger seat headrest bar (mic pointing up or forward), since this would be pulling sound closest to where a passenger's ears would be?

http://farm3.static.flickr.com/2037/...82d2bd6948.jpg



Cool idea, Carl.
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  #6  
Old December 17th, 2009, 12:54 PM
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Jason England
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We can test how loud the wipers are to see if mine need repair!
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  #7  
Old December 17th, 2009, 05:55 PM
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Shane
D90SW 1997
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59 Idle
74 City
81 Highway

SW with no carpet in the front footwells, just rubber mats. Carpet in the back.
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  #8  
Old December 17th, 2009, 06:00 PM
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Bill Lewis
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Sweet! I am going to try this out. I am using a pair of wire ties to strap it to my head, over my ear.

bill
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  #9  
Old December 17th, 2009, 06:04 PM
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Joshua
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Quote:
Originally Posted by kolvedic
Sweet! I am going to try this out. I am using a pair of wire ties to strap it to my head, over my ear.

bill
This is useless without pictures. BAHHHAHA
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  #10  
Old December 17th, 2009, 07:26 PM
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Bill Lewis
1995 White SW 339/500
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Hwy: 93
idle:62
city:73

95sw, dynamat hood liner, dynamat extreme rear floor w/ carpet & load mat,
dynamat footwells & tunnel w/ carpet
I do run GY mud terrains.

Bil

ps- pics coming!
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  #11  
Old December 17th, 2009, 11:53 PM
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Carl Jonsson
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yes, mine is a D90 stationwagon but I encourage anyone to join. Just make sure to give enough info to make a fair comparison (type of truck, soundproofing, other variables).

Quote:
Originally Posted by thewap
This is on a SW correct?
Follow-up Post:

on the seat is fine or hanging from the rearview mirror? I put mine in the ashtray but it didn't give a fair reading due to the vibration hitting the phone.

Quote:
Originally Posted by ini88
This is going to be awesome. I'll test mine this weekend. Where did you put the iPhone in the car?
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  #12  
Old December 19th, 2009, 05:30 PM
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Good idea. Here's my data (Idle/City/Highway):

1983 110 Hi-Cap Pickup, 200Tdi, Wright Offroad Rubber Matting and McMaster Carr sound dampening material under the headliner:
83/89/92 dB

1993 NAS 110, McMaster Carr sound dampening material under the headliner and stock carpeting.
65/79/84 dB

1997 NAS 90, Badger III Softtop
69/80/94 dB

And because all experiments need a control,
2005 Range Rover
58/75/77 dB
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  #13  
Old December 23rd, 2009, 04:02 PM
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Carl Jonsson
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My wife's car is about 80 dB on the freeway, so some of us aren't too far of.

There's also another iPhone app for calculating fuel economy. There's several actually. I have one called Accufuel. Link: http://www.appigo.com/accufuel It would be nice to do the same comparison between defenders for those of you who are interested. It's $1.

Lately Accufuel has reported 22.2 MPG's on my D90. I know that my Speedometer is 12% too fast so the number should be more like 24.8. If anyone is interested in comparing post your mpg's and specifics here.
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  #14  
Old December 24th, 2009, 10:51 AM
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I've used Gas Cubby for the past year or so. The V8 Defenders average around 15mpg. The 200Tdi HCPU gets 23-24mpg. I've swapped the speedo drive gear so that it's within 1mph of GPS, so that number should be pretty accurate.
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  #15  
Old December 24th, 2009, 04:48 PM
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Carl Jonsson
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How do you swap the speedo drive gear? I'd like to get mine more accurate.

Gas Cubby is better, more functions (service reminders, etc).

Quote:
Originally Posted by newfD90
I've used Gas Cubby for the past year or so. The V8 Defenders average around 15mpg. The 200Tdi HCPU gets 23-24mpg. I've swapped the speedo drive gear so that it's within 1mph of GPS, so that number should be pretty accurate.
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  #16  
Old December 24th, 2009, 06:11 PM
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It's easy. Just disconnect the cable from the back of the transfer case. There will be one nut on a clamp holding the cable in. Then with a flat bladed screwdriver pry out the drive housing. You'll probably have to clean the junk out of the groove on the side. Once the groove is visible, work the screwdriver around the housing. Pry some on the left, and then the right until you work it out.

I think I ended up with a yellow, 22 tooth gear. Stock rear end and a 1.198:1 LT230

Here's a good thread with info on the various speedo gears:

http://www.aulro.com/afvb/technical-...orm-gears.html

Yep, I've been very happy with Gas Cubby. I use it mainly so that I know when it's time to change the oil on the fleet.

Follow-up Post:

Quote:
Originally Posted by Manimal
Gas Cubby is better, more functions (service reminders, etc).
Well crap, looks like there's a free, sponsored version now:

http://www.tuaw.com/2009/12/24/gas-c...sored-version/
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  #17  
Old December 26th, 2009, 02:14 AM
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Peter/Lesbo
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WOW "O" WOW mine is loud

Ok got my sound measurements done... 1983 110 300TDI with no headliner or any sound proofing to speak of...

Idle: 91 dB
City: 95 dB
Freeway: 101 dB

This was measured with an actual sound meter from Radio Shack.

Now ya'all know why I was asking about headsets... ZTime to think about that sound proofing.

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  #18  
Old December 26th, 2009, 06:07 AM
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Charles Galpin
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But is it a fair comparison the the Decibel iphone app readings?

I didn't write mine down, but they are on par with Chance's hi-cap. Will get readings next week.
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  #19  
Old December 26th, 2009, 09:50 AM
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Carl Jonsson
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Peter, that is really loud. Even if you get headsets I would put in soundproofing as well. At 90-95 and above you cause hearing loss!

Charles, for what we're doing the apps should be in the ballpark but a sound meter like the one Charles used is of course more accurate.
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  #20  
Old December 26th, 2009, 01:03 PM
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Quote:
Originally Posted by IPSC_GUY
1983 110 300TDI with no headliner or any sound proofing to speak of...
Holy crap, that IS loud! You can't go wrong with the Wright Offroad rubber matting for the floors and seatbox. It's the same stuff that Exmoor sells, but you save a bit by going to the source.
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