What's Your dB?

RBBailey

NAS-ROW Addict
Callsign: KF7KFZ
I have been wondering what type of noise others get in their cabs when driving, and although we can't have any kind of scientific study, I wonder if we might actually gather some kind of data just to see if it might be possible to tackle noise a bit more. For example, if several of you have quieter levels than what I have, I'd want to know some of what you've done to get it quiet. So here's what I think might give us a baseline.

Download the app NIOSH SLM for your iPhone. You can look at the info to see why I recommend this app. Don't mess with any of the settings, but start looking at the noise levels with the phone in a holder while driving, then report what you find here.

110, 300Tdi, standard exhaust, roof rack, 235/85 BFG KM2s @ 60mph flat with windows up = ~74 dB
 

rocky

Well-known member
I've been using Decibel X. Wonder what results NIOSH will give me (Iphone XR)
 

RBBailey

NAS-ROW Addict
Callsign: KF7KFZ
I just tested the Series at 45-50 MPH with open side soft top and G90 tires = ~80 dB.
 

Bostondave

Well-known member
I like this idea. I wonder how my 97 with NRP compares to stock. Sometimes I love the NRP and other times I would prefer a quieter/stock setup.
 

rocky

Well-known member
A few thoughts.
Holding the phone in your hand results in lower numbers than having it in RAM mount.
Opening the BH vents adds to the noise level.
Also the Decibel app results in much higher numbers than the NIOSH app.
Who knows which one is better But at least we have them!
 

RBBailey

NAS-ROW Addict
Callsign: KF7KFZ
The NOSH app says it is calibrated for the phone as well as they can make it. Considering the publisher, I figured it might at least give more consistent results from one of us to the next.

I forgot about the dash vents. I don’t have those! So mine are closed.
 

Jeff B

Well-known member
- mine is a '97 ST.
It is very noisy.
I run either 285/75 BFG AT's (old ones) or 255/85 KM2 MTs

I have worn Bose 35 noise cancelling headphones on longer trips and they're great.


.
 

RBBailey

NAS-ROW Addict
Callsign: KF7KFZ
Get the app! I am curious about what others are experiencing. I’m doing a lot of noise abatement, and I think it is just barely working, but hard to know unless I have some comparison.
 

Jeff B

Well-known member
Get the app! I am curious about what others are experiencing. I’m doing a lot of noise abatement, and I think it is just barely working, but hard to know unless I have some comparison.
I think I will try the app.

FWIW, I have the Exmoor seatbox-floor-tunnel cover(1/2" thick rubber) and Eastwood heat/sound proofing in certain spots. Dynamat in doors.


.
 

Bostondave

Well-known member
78 dB at 65 mph in my 97 SW. All hvac off, windows up and bh vents closed. SD rack/basket. 265/75 BFG ATs, NRP exhaust.
 

emj

New member
86db at 65mph in a hard top Tithonus with 300tdi, Michelin XZLs, Exmoor matts on seatbox and floor/tunnel, lots of Dynamat all around. Still extremely loud.
 

Viton

Well-known member
I've had that APP for quite some time in my '97 NAS SW 300Tdi w/ Zf autobox, BFG AT/KO2's 235/85 16's
My reading is 83dB @ 65mph, held in my right hand while driving
 
Last edited:
Top