Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274
Has anyone measured the decibel levels in their D3?
I ask as I found my old meter in my toolbox the other day, slipped a 9v battery in (remember them!) and tried it out in the car.
70mph on cruise 65 decibels, now I thought that was quite good?
Boat @ 1800rpm 7 knots, 72 dbs in the cabin
Snap on 1/2 air impact no silencer 110dbs @ 1 mtr!
25th Jul 2020 10:06 pm
AJ198T
Member Since: 24 Jul 2015
Location: Sheffield
Posts: 63
I haven't measured but I remember reading a spec website, possibly an American one, that listed the dB rating of different cars at various speeds and I recall the D3 being in 60s and notably lower than most others. Passengers often comment how quiet and smooth it is. What tyres are you on just out of curiosity? I want to make sure when I change mine it doesn't disturb the serenity.
26th Jul 2020 10:07 am
rrhool
Member Since: 28 Aug 2014
Location: Norfolk
Posts: 4540
I used a phone app sound level meter, to see if there was any difference when I did the under-bonnet sound proofing. It was about 1 dB better with the insulation!Richard
D3 SE 2007. Triumph 2.5Pi 1973. Ferguson TEA20 1948.
Discovery 2 4.0 ES 2001- Gone
Discovery 1 300Tdi ES '95 - Gone
Range Rover Classic '79 - Gone
26th Jul 2020 10:34 am
lynalldiscovery
Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274
AJ198T wrote:
I haven't measured but I remember reading a spec website, possibly an American one, that listed the dB rating of different cars at various speeds and I recall the D3 being in 60s and notably lower than most others. Passengers often comment how quiet and smooth it is. What tyres are you on just out of curiosity? I want to make sure when I change mine it doesn't disturb the serenity.
Pirelli ATR 255/19, had zeros before, and Iirc both thave same noise rating?
Whole car totally standard, apart from new engine cover noise insulation as mentioned by rrhool above.
26th Jul 2020 3:12 pm
aja4x4
Member Since: 14 Apr 2019
Location: Westbury
Posts: 2463
My D4 commercial seems quieter than my D3 but i think thats due to the Duratec tyres
Whole car totally standard, apart from new engine cover noise insulation as mentioned by rrhool above.
Does anybody have the details of these engine noise insulation kits?
2nd Apr 2021 12:03 pm
lynalldiscovery
Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274
Its is just self adhesive sound matting from ebay
There is a decent thread on here somewhere, Iirc there is enough to do inside the engine cover and under the bonnet skin, so you have two layers of sound deadening on the bonnet.
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