Hood Liner:
Moderators: Helpinators, Moderators
Hood Liner:
I need some sound deadening material for the underside of the hood.
Needs to be heat resistant, dull grey or black and self-adhesive.
Saw something in the net that looked OK , but it was in Asia somewhere.
the highly reflective and expensive racing stuff can be found anywhere.
Any ideas
Needs to be heat resistant, dull grey or black and self-adhesive.
Saw something in the net that looked OK , but it was in Asia somewhere.
the highly reflective and expensive racing stuff can be found anywhere.
Any ideas
Subtle (normally aspirated engines suck):
05 Legacy GT Wagon with Cobb chip.
62 Alfa Romeo Spider- had a 1.6 L with 80 hp, now 2 L with 160 torque. Curb weight 2050 lbs.
93 Leg Twgn fmic, vf34, etc. ((sold))
05 Legacy GT Wagon with Cobb chip.
62 Alfa Romeo Spider- had a 1.6 L with 80 hp, now 2 L with 160 torque. Curb weight 2050 lbs.
93 Leg Twgn fmic, vf34, etc. ((sold))
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Dynamat actually makes a specific "Hoodliner" that costs about $70. See here:
http://www.dynamat.com/
http://www.dynamat.com/
'91 5MT SS-TD04, WRX TMIC, Bosal twin dump, Spec LW flywheel/pressure plate, FCD, Walbro fuel pump-RIP
'93 5MT N/A wagon, over 400,000 miles!-Gone, parts lived on
'94 Auto SS-vf24, WRX TMIC, Bosal twin dump, Meth kit coming soon!-Now RWD!
'93 5MT N/A wagon, over 400,000 miles!-Gone, parts lived on
'94 Auto SS-vf24, WRX TMIC, Bosal twin dump, Meth kit coming soon!-Now RWD!
Thanks for the responses.
vrg3--With the removal of the snorkus and the addition of the
fmic there has been an increase in intake noise--as you would
expect.
I've spent years driving modified cars and at one time loud
was good, but not no more.
Quiet is another dimension of having a "sleeper".
vrg3--With the removal of the snorkus and the addition of the
fmic there has been an increase in intake noise--as you would
expect.
I've spent years driving modified cars and at one time loud
was good, but not no more.
Quiet is another dimension of having a "sleeper".
Subtle (normally aspirated engines suck):
05 Legacy GT Wagon with Cobb chip.
62 Alfa Romeo Spider- had a 1.6 L with 80 hp, now 2 L with 160 torque. Curb weight 2050 lbs.
93 Leg Twgn fmic, vf34, etc. ((sold))
05 Legacy GT Wagon with Cobb chip.
62 Alfa Romeo Spider- had a 1.6 L with 80 hp, now 2 L with 160 torque. Curb weight 2050 lbs.
93 Leg Twgn fmic, vf34, etc. ((sold))
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- Fourth Gear
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I don't think the sleeper part is worth adding that much weight.
Add the dynamat to your firewall, wheelwells, and doors (as well as under all carpeting) instead and you'll have a much nicer interior sound (or lack of). Most people cannot hear your intake and stuff from their car anyways.
Add the dynamat to your firewall, wheelwells, and doors (as well as under all carpeting) instead and you'll have a much nicer interior sound (or lack of). Most people cannot hear your intake and stuff from their car anyways.
[url=http://www.sl-i.net/FORUM/viewtopic.php?t=486]1995 Legacy Outback 5MT[/url]
185,000 miles
www.sl-i.net (for all Legacys!)
185,000 miles
www.sl-i.net (for all Legacys!)
Well---the other part of the exercise was to shield the hood
from the heat of the pipe from the turbo to the I/C. Also
the new stock one is one grade above cardboard, and looks
it. Also it doesn't line the full underside of the hood.
Other than one of Laurel's layer cakes, what's an alternative?
Weight is not good.
from the heat of the pipe from the turbo to the I/C. Also
the new stock one is one grade above cardboard, and looks
it. Also it doesn't line the full underside of the hood.
Other than one of Laurel's layer cakes, what's an alternative?
Weight is not good.
Subtle (normally aspirated engines suck):
05 Legacy GT Wagon with Cobb chip.
62 Alfa Romeo Spider- had a 1.6 L with 80 hp, now 2 L with 160 torque. Curb weight 2050 lbs.
93 Leg Twgn fmic, vf34, etc. ((sold))
05 Legacy GT Wagon with Cobb chip.
62 Alfa Romeo Spider- had a 1.6 L with 80 hp, now 2 L with 160 torque. Curb weight 2050 lbs.
93 Leg Twgn fmic, vf34, etc. ((sold))
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- Spelling Nazi
- Posts: 4644
- Joined: Fri Aug 29, 2003 7:14 am
- Location: Lynnwood, WA
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- Fourth Gear
- Posts: 1141
- Joined: Tue Sep 20, 2005 4:04 am
- Location: Stevens Point, WI
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The underhood pad isn't really designed to reduce noise. It's fire suppression.
Sound deadening is usually controlled in the cabin, and if you are really concerned with noise, invest sound deadening material where it will make a difference.
It's not going to make much difference on the outside, how much sound deadening you have under the hood. Really fast cars are loud. It's the way the world works.
It will barely be any quieter from the outside, if you install sound deadening material under the hood. It could be a potential fire hazard though.
Sound deadening is usually controlled in the cabin, and if you are really concerned with noise, invest sound deadening material where it will make a difference.
It's not going to make much difference on the outside, how much sound deadening you have under the hood. Really fast cars are loud. It's the way the world works.
It will barely be any quieter from the outside, if you install sound deadening material under the hood. It could be a potential fire hazard though.
2009 Outback 2.5XT. 5MT. Satin White Pearl.
2009 Impreza 2.5i Premium. Blue.
[quote="scottzg"]...I'm not a fan of the vagina...[/quote][quote="evolutionmovement"]This will all go much easier if people stop doubting me.[/quote]
2009 Impreza 2.5i Premium. Blue.
[quote="scottzg"]...I'm not a fan of the vagina...[/quote][quote="evolutionmovement"]This will all go much easier if people stop doubting me.[/quote]
Years ago I had a 1600 Alfa roadster--took the air box off, and
put velocity stacks on the twin-choke Webers. The
sound was awesome and the thinly insulated hood amplified
the intake roar. , then.
Now I just want to isolate the hissing sound and diminish the heat
transfer to the hood.
put velocity stacks on the twin-choke Webers. The
sound was awesome and the thinly insulated hood amplified
the intake roar. , then.
Now I just want to isolate the hissing sound and diminish the heat
transfer to the hood.
Subtle (normally aspirated engines suck):
05 Legacy GT Wagon with Cobb chip.
62 Alfa Romeo Spider- had a 1.6 L with 80 hp, now 2 L with 160 torque. Curb weight 2050 lbs.
93 Leg Twgn fmic, vf34, etc. ((sold))
05 Legacy GT Wagon with Cobb chip.
62 Alfa Romeo Spider- had a 1.6 L with 80 hp, now 2 L with 160 torque. Curb weight 2050 lbs.
93 Leg Twgn fmic, vf34, etc. ((sold))
you could heat wrap the intake pipes and turbo stuff with that expensive stuff you spoke of. i'm pretty sure it will still be cheaper than dynamatting your whole firewall and under all the carpet. not to mention easire than pulling out all your engine stuff that attaches/goes through the firewall.
stupid electrical work...
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Don't mod?
You gotta pay to play, so just remember that. Anything you do to supress the sound of power, will slow you down.
Why is there more heat transfer to the hood? Because the IC pipe runs close to it? Every FMIC kit for the WRX either touches, or almost touches, the hood, and no one has problems with that. I wouldn't even worry about that aspect of it.
You gotta pay to play, so just remember that. Anything you do to supress the sound of power, will slow you down.
Why is there more heat transfer to the hood? Because the IC pipe runs close to it? Every FMIC kit for the WRX either touches, or almost touches, the hood, and no one has problems with that. I wouldn't even worry about that aspect of it.
2009 Outback 2.5XT. 5MT. Satin White Pearl.
2009 Impreza 2.5i Premium. Blue.
[quote="scottzg"]...I'm not a fan of the vagina...[/quote][quote="evolutionmovement"]This will all go much easier if people stop doubting me.[/quote]
2009 Impreza 2.5i Premium. Blue.
[quote="scottzg"]...I'm not a fan of the vagina...[/quote][quote="evolutionmovement"]This will all go much easier if people stop doubting me.[/quote]
Oops--All I need is some stuff to stick to the underside of the hood to
reduce the heat transfer and to reduce the intake noise--neither has
anything to do with performance.
Also, where the turbo to fmic pipe is closest to the hood there is no
insulation at all, and a patch would make it look even worse.
reduce the heat transfer and to reduce the intake noise--neither has
anything to do with performance.
Also, where the turbo to fmic pipe is closest to the hood there is no
insulation at all, and a patch would make it look even worse.
Subtle (normally aspirated engines suck):
05 Legacy GT Wagon with Cobb chip.
62 Alfa Romeo Spider- had a 1.6 L with 80 hp, now 2 L with 160 torque. Curb weight 2050 lbs.
93 Leg Twgn fmic, vf34, etc. ((sold))
05 Legacy GT Wagon with Cobb chip.
62 Alfa Romeo Spider- had a 1.6 L with 80 hp, now 2 L with 160 torque. Curb weight 2050 lbs.
93 Leg Twgn fmic, vf34, etc. ((sold))
Low frequency noise is reduced better by heavy materials - like dynamat
high frequency noise is reduced better by low density materials like foams. you mentioned hissing so you should really be reaching for some of the adhesive foam that sticks to the underside of the hood
still as vrg3 mentioned, its mostly the sound radiating through the firewall that you hear.
high frequency noise is reduced better by low density materials like foams. you mentioned hissing so you should really be reaching for some of the adhesive foam that sticks to the underside of the hood
still as vrg3 mentioned, its mostly the sound radiating through the firewall that you hear.
That beer you are drinking cost more than my car
Most of the noise audible from outside the car comes from the exhaust
IMO, muting the hood will do little by itself.
You'd have to do the hood, the fenders, the bumper, and somehow stop sound from coming out the bottom of the engine compartment and bouncing off the road
IMO, muting the hood will do little by itself.
You'd have to do the hood, the fenders, the bumper, and somehow stop sound from coming out the bottom of the engine compartment and bouncing off the road
98 Steel Widebody RSTi-RA Superbeast
Prof.
I'm with you --I took a B.Sc. in Geophysics.
There are 2 ways of looking at it. One is to prevent sound from coming in,
by adding to the the insulation already put in the body shell. The other is to
absorb some at the source and at the same time ease the heat to the
hood , as well as getting rid of the OEM garbage liner.
No big deal, and all advice has been appreciated.
I'm with you --I took a B.Sc. in Geophysics.
There are 2 ways of looking at it. One is to prevent sound from coming in,
by adding to the the insulation already put in the body shell. The other is to
absorb some at the source and at the same time ease the heat to the
hood , as well as getting rid of the OEM garbage liner.
No big deal, and all advice has been appreciated.
Subtle (normally aspirated engines suck):
05 Legacy GT Wagon with Cobb chip.
62 Alfa Romeo Spider- had a 1.6 L with 80 hp, now 2 L with 160 torque. Curb weight 2050 lbs.
93 Leg Twgn fmic, vf34, etc. ((sold))
05 Legacy GT Wagon with Cobb chip.
62 Alfa Romeo Spider- had a 1.6 L with 80 hp, now 2 L with 160 torque. Curb weight 2050 lbs.
93 Leg Twgn fmic, vf34, etc. ((sold))
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I guess I'm just not sure why you are trying to do this?
If you sound deaden the hood, you'll still hear everything just as loud outside the car as well as inside the car. You'll add weight (reducing performance), and the only "benefit" is to get rid of the OEM "garbage" liner (which is for fire suppression, NOT sound deadening).
So I guess use some Dynamat Extreme or whatever to accomplish whatever your actual goal is. I would be almost certain you won't notice any difference, or any difference worth the extra weight you'll add (even though you'll only add 2 pounds at most, it wouldn't be worth it to me).
If you sound deaden the hood, you'll still hear everything just as loud outside the car as well as inside the car. You'll add weight (reducing performance), and the only "benefit" is to get rid of the OEM "garbage" liner (which is for fire suppression, NOT sound deadening).
So I guess use some Dynamat Extreme or whatever to accomplish whatever your actual goal is. I would be almost certain you won't notice any difference, or any difference worth the extra weight you'll add (even though you'll only add 2 pounds at most, it wouldn't be worth it to me).
2009 Outback 2.5XT. 5MT. Satin White Pearl.
2009 Impreza 2.5i Premium. Blue.
[quote="scottzg"]...I'm not a fan of the vagina...[/quote][quote="evolutionmovement"]This will all go much easier if people stop doubting me.[/quote]
2009 Impreza 2.5i Premium. Blue.
[quote="scottzg"]...I'm not a fan of the vagina...[/quote][quote="evolutionmovement"]This will all go much easier if people stop doubting me.[/quote]
Two lbs I can handle.
Last year the twgon got about 40 lbs lighter---Got rid or 20 by shedding
the mechanical U S seatbelt BS and went on the Atkins diet.
Last year the twgon got about 40 lbs lighter---Got rid or 20 by shedding
the mechanical U S seatbelt BS and went on the Atkins diet.
Subtle (normally aspirated engines suck):
05 Legacy GT Wagon with Cobb chip.
62 Alfa Romeo Spider- had a 1.6 L with 80 hp, now 2 L with 160 torque. Curb weight 2050 lbs.
93 Leg Twgn fmic, vf34, etc. ((sold))
05 Legacy GT Wagon with Cobb chip.
62 Alfa Romeo Spider- had a 1.6 L with 80 hp, now 2 L with 160 torque. Curb weight 2050 lbs.
93 Leg Twgn fmic, vf34, etc. ((sold))
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- Moderator
- Posts: 9026
- Joined: Thu Jan 29, 2004 8:47 pm
- Location: Maryland www.andrewtechautomotive.com
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But you won't gain anything noticeable in the sound suppression department unless your intercooler pipes are rubbing your hood...
2009 Outback 2.5XT. 5MT. Satin White Pearl.
2009 Impreza 2.5i Premium. Blue.
[quote="scottzg"]...I'm not a fan of the vagina...[/quote][quote="evolutionmovement"]This will all go much easier if people stop doubting me.[/quote]
2009 Impreza 2.5i Premium. Blue.
[quote="scottzg"]...I'm not a fan of the vagina...[/quote][quote="evolutionmovement"]This will all go much easier if people stop doubting me.[/quote]