Sound Deadening and the most beneficial spots to target

[Drifte]

I have done sound treatments and audio upgrades to many many cars (and homes)over the years. Unlike most I havent been disapointed in the JBL sound system that came in my truck, but I was sure it could benefit from some key sound deadening and absorption areas. This thread will just be me documenting some of that process and letting you guys know what I found to give the most return for my efforts.

Under the hood:
I am a big fan of turbo inline engines, however this one is a bit a noisy and not in a good way. My first attempt to quiet it down was with an engine cover. This had no noticable result in the cab, or from outside of the truck. I applied a close cell adhesive back foam to hopefully absorb some noises. Approximately 5k miles on the truck since this was installed.

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[Drifte]

I was hesitant to use underhood sound deadener, as the heat seems like it could be an issue. But I have seen many utilize it with success, and the deadener I purchased is rated for underhood use.

Under the hood (again):

This time I removed my factory underhood material that is intended to quiet the engine. Gave it a quick wipe down, and installed some small peices of 3 layer deadener to the outer sheet metal, then full size sheets to the inner. Then reinstalled the hood liner. This had GREAT results and I highly reccomend this if you find the engine noise not to your liking.

 

[dvrgz]

Going to give it a shot @Drifte

 

[Drifte]

This is what Ive been using. I have an update on the door treatment to post here soon, but I also do a layer of closed cell foam over this deadener combo.

https://www.amazon.com/dp/B0B6JKF9SC?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1

 

[dvrgz]

I have an update on the door treatment to post here soon,

Thank you, looking forward to that. I’ve got a roof rack and I’m looking to kill some of the wind noise. Though it’s not bad (especially with music on), cutting down on some of it would help.

 

[theDLR]

aha, mine looks exactly the same. i used siless max tho

 

[hagglethorn]

Is the Siless stuff heavy? Think it would give Redline hood struts a problem?

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