What's new
The Grenadier Forum
Register Now for enhanced site access.
INEOS Agents, Dealers or Commercial vendors please contact admin@theineosforum.com for a commercial account.

Boomy sound from rear

nuclearbeef

nuclearbeef

Grenadier Owner
Lifetime Supporter
Local time
7:51 AM
Joined
May 21, 2023
Messages
250
Reaction score
399
Location
Memphis
Seems the rear of the truck is very "boomy" going over rough pavement.
Even expansion joints in the concrete cause a "boom" in the passenger compartment.

Has anyone found the source of the sound or a fix?
My Troopy was very similar. A little insulation on the ceiling and floor knocks 90% of the sound down.

Insulated mat for the cargo space?
Or is it more roof? Dynamat under the headliner?
 
Norb-TX

Norb-TX

Grenadier Owner
Local time
7:51 AM
Joined
Jun 2, 2022
Messages
573
Reaction score
726
Location
Houston
You're right about the lack of insulation, whenever I use the big horn, it sounds like its mounted inside the cabin!
 
Texas Grenadier

Texas Grenadier

Global Grenadier Member 942
Grenadier Owner
Lifetime Supporter
Local time
7:51 AM
Joined
Sep 12, 2022
Messages
208
Reaction score
289
Location
Dallas, Texas
I'm getting a drawer system for mine. Hopeful that it will quiet mine a little too.
 
Greg

Greg

Grenadier Owner
Lifetime Supporter
Local time
11:51 PM
Joined
May 27, 2022
Messages
229
Reaction score
411
I put this in as i will be removing the standard flooring mat when i build the drawers. This will give the drawers something to sit on.
Until the drawers are in the standard floor mat goes over it no worries.
It does seem to reduce the noise as it is designed to lessen panel vibration of which there seems to be a bit on the boot floor... give it a tap some time with the mat removed.
20240228_154521.jpg
 
anand

anand

Photo Contest Winner
Forum Moderator
Grenadier Owner
Lifetime Supporter
Local time
8:51 AM
Joined
Mar 12, 2023
Messages
2,995
Reaction score
4,855
Location
Maryland
My plan will be 50-80% coverage CLD over everything, then 3M Thinsulate on the doors/sides/roof and 3M Minicell + 3M TAI on the floor... Not sound related, but also a layer of 3M Low-E between the Thinsulate and headliner
 
Greg

Greg

Grenadier Owner
Lifetime Supporter
Local time
11:51 PM
Joined
May 27, 2022
Messages
229
Reaction score
411
Whilst i would love to add more (I have gone crazy on my previous cars) I am mindful of adding extra unnecessary weight. This is just to compensate for the removal of the boot mat.
Just by getting in the driver's seat I add 115kg...
 
AWo

AWo

Local time
2:51 PM
Joined
Feb 28, 2023
Messages
1,072
Reaction score
1,996
Location
Germany
Greg said:
I put this in as i will be removing the standard flooring mat when i build the drawers. This will give the drawers something to sit on.
Until the drawers are in the standard floor mat goes over it no worries.
It does seem to reduce the noise as it is designed to lessen panel vibration of which there seems to be a bit on the boot floor... give it a tap some time with the mat removed.
View attachment 7847143
Click to expand...
Is that something like alubutyl? Glued in? Like black tar?
Hopefully not....you'll never get this out again without a lot of work, dirt, sweat and swearing. I would never use such stuff.

AWo
 
D

donnygreygrenadier

Grenadier Owner
Lifetime Supporter
Local time
8:51 AM
Joined
Oct 4, 2023
Messages
110
Reaction score
137
Location
New Jersey, USA
nuclearbeef said:
Seems the rear of the truck is very "boomy" going over rough pavement.
Even expansion joints in the concrete cause a "boom" in the passenger compartment.

Has anyone found the source of the sound or a fix?
My Troopy was very similar. A little insulation on the ceiling and floor knocks 90% of the sound down.

Insulated mat for the cargo space?
Or is it more roof? Dynamat under the headliner?
Click to expand...

I found reducing the tire pressure helps a little. Recently, tire pressures went up (short term warm spell) and the boomy noise increased). Tire pressures were up to 45F & 50R (cold). At delivery I had the dealer set them 5psi lower - yesterday I reduced down to 40F & 45R.
 
G

grenexplorer

Grenadier Owner
Local time
8:51 AM
Joined
Jun 20, 2023
Messages
44
Reaction score
79
Location
United States
donnygreygrenadier said:
I found reducing the tire pressure helps a little. Recently, tire pressures went up (short term warm spell) and the boomy noise increased). Tire pressures were up to 45F & 50R (cold). At delivery I had the dealer set them 5psi lower - yesterday I reduced down to 40F & 45R.
Click to expand...
Take them down even more....

I was at that pressure rolling out of the dealer and drove 4 hours home...wasn't the handling and sound I was hoping for. Dropped it to 39psi the next day...its perfect. I think some folks were even running 37 F/R.
 
Last edited:
bikesandguitars

bikesandguitars

Grenadier Owner
Local time
6:51 AM
Joined
Jun 28, 2023
Messages
264
Reaction score
513
Location
Colorado
I’ve noticed my steel wheels are quieter than my wife’s alloys. Also, I have a TM with a second battery. My wife has the FM that is somewhat hollow under the seat. I may put a piece of foam under the seat and see if helps. But I haven’t found either to be excessively noisy - but I am looking forward to a fitted weather mat in the rear. I’m bungeying everything down in milk crates for the time being.
 
Last edited:
You must log in or register to reply here.

Similar threads

D
My Experience at 6 weeks - someone who LOVE(S) / LOVE(D) the car (please leave your comments and input)
3 4 5
Replies
80
Views
4K
Mountain4x4
M
Wombat51
To the Kimberley and return (Western Australia)
Replies
14
Views
1K
Js9
J
TheDocAUS
AUSTRALIA: Third party suppliers for the Grenadier
15 16 17
Replies
337
Views
23K
euroflo
E
Forum Store
The officially unofficial podcast for INEOS Automotive Grenadier Works Podcast
INEOS Grenadier Configurator

Latest posts

Share this page

Back
Top Bottom