Under Bonnet Sound Sheet

st11x · 23-02-2004, 09:54 AM

Hi,

The sheet of material under the bonnet has fallen off. It was dangling dangerously for the last week and it finally came off while I was servicing the car.

I couldn't find the exact replacement but got a universal sponge replacement that I can cut to size (cost about 43 dollar from SuperCheap). It's a little thick, and it doesn't seem to help deadening the sound at all. Even the old one didn't seem to have any effects. But it sure feels comforting to have it on as my last car had oil spluttered all over the underside of the bonnet.

I'm just worried that the heat of the engine might burn it, or the engine might get hotter as a result. It was designed specifically to fit under the bonnet though.

Any thoughts on this?

Thanks
Matthew

twilightprotege · 23-02-2004, 10:20 AM

just rip it off and leave it off. save yourself some money

JynX · 23-02-2004, 10:38 AM

Its mainly there to avoid heat damaging the paint on your bonnet. Ive had mine off for over 2 years and the paint hasnt bubbled yet.

Nothing some well placed heat shield cant fix anyway.

twilightprotege · 23-02-2004, 11:06 AM

i've taken it off on my previous 2 cars. the last one was off for 5 years, no prob. my sp20 has been off since i got it (coming up 3 years). no problem at all. anyway, that bit extra engine noise is noice

Toyboy · 23-02-2004, 03:19 PM

That little extra engine noise isnt nice when your HLA's are shot :P Id prefer to keep the insulation to protect your paint,if not keep your bonnet well polished and waxed 8)

st11x · 23-02-2004, 09:52 PM

Thanks for the thoughts guys. I'll probably keep it on for the time being since I've already spent 40 bucks on it. When it falls off again, I wouldn't rush to get a replacement for sure.

This is the first car that I've seen with that sheet under the bonnet though. I do agree the sound sure feels good :wink: when driving.

Matt

BigMal · 25-02-2004, 02:57 PM

Remove the front and rear rubbers on the bonnet to allow air to flow through to stop any
chance of paint peeling on the bonnet. Years of driving around with a BPT and the only
damage my bonnet doesn't have is peeling from heat. Stone chips, bent and busted is another
story altogether.

Mal

Rupewrecht · 25-02-2004, 03:11 PM

Quote:

Originally Posted by BigMal

Remove the front and rear rubbers on the bonnet to allow air to flow through to stop any
chance of paint peeling on the bonnet. Years of driving around with a BPT and the only
damage my bonnet doesn't have is peeling from heat. Stone chips, bent and busted is another
story altogether.

Mal

i removed the rubbers and it dropped my engine bay temperatures by about 5 degrees!

and you'll want the heat sheild back when you go turbo, jimmeh

jcywong · 25-02-2004, 03:51 PM

Quote:

i removed the rubbers and it dropped my engine bay temperatures by about 5 degrees!

but you will get water into the engine though

Rupewrecht · 25-02-2004, 04:00 PM

into the engine bay, perhaps, but the drop in temperature is worth it as far as i'm concerned.

and my engine bay is dirty anyway. darn dirt roads!

jcywong · 25-02-2004, 05:12 PM

I only remove the back seal so it can allow hot air out from under the bonnet.
i did not remove the front one so nothing can come into under the bonnet

twilightprotege · 25-02-2004, 08:53 PM

having water in the engine bay is no problem at all. they are designed for that (within reason of course). take your car for a drive on very wet roads while it's raining and the engine bay will all be soaked no matter what you leave on or remove.

as rupe said, 5 degrees decrease in temp is worth it

Cosmo Dude · 25-02-2004, 09:18 PM

I'd only remove the rear rubber, the area around the windscreen wipers is an area of low preasure and as such air will be drawn from under the hood and over the roof. The engine bay will then need to get more air from somewhere... either from underneath or through the radiator.
If it's through the radiator then the cooling system, A/C and FMIC will benefit

If it's from under the car then welcome (so very very very very very very slightly) to the world of ground effects.

In the long run drawing hot air from the engine is better than trying to ram cold air around it

JynX · 25-02-2004, 10:04 PM

Quote:

Originally Posted by Rupewrecht

Quote:

Originally Posted by BigMal

Remove the front and rear rubbers on the bonnet to allow air to flow through to stop any
chance of paint peeling on the bonnet. Years of driving around with a BPT and the only
damage my bonnet doesn't have is peeling from heat. Stone chips, bent and busted is another
story altogether.

Mal

i removed the rubbers and it dropped my engine bay temperatures by about 5 degrees!

and you'll want the heat sheild back when you go turbo, jimmeh

got a custom one being made

the stocky is ugly as sik naked.

jcywong · 26-02-2004, 12:39 AM

i afraid it will wet my pod filter if i remove the front seal

sik astina · 26-02-2004, 12:27 PM

Quote:

Originally Posted by JynX

Quote:

Originally Posted by Rupewrecht

Quote:

Originally Posted by BigMal

Remove the front and rear rubbers on the bonnet to allow air to flow through to stop any
chance of paint peeling on the bonnet. Years of driving around with a BPT and the only
damage my bonnet doesn't have is peeling from heat. Stone chips, bent and busted is another
story altogether.

Mal

i removed the rubbers and it dropped my engine bay temperatures by about 5 degrees!

and you'll want the heat sheild back when you go turbo, jimmeh

got a custom one being made

the stocky is ugly as sik naked.

LOL funny bastard

23-02-2004, 09:54 AM	#1
st11x Junior Member Join Date: Feb 2004 Posts: 68	Under Bonnet Sound Sheet Hi, The sheet of material under the bonnet has fallen off. It was dangling dangerously for the last week and it finally came off while I was servicing the car. I couldn't find the exact replacement but got a universal sponge replacement that I can cut to size (cost about 43 dollar from SuperCheap). It's a little thick, and it doesn't seem to help deadening the sound at all. Even the old one didn't seem to have any effects. But it sure feels comforting to have it on as my last car had oil spluttered all over the underside of the bonnet. I'm just worried that the heat of the engine might burn it, or the engine might get hotter as a result. It was designed specifically to fit under the bonnet though. Any thoughts on this? Thanks Matthew

23-02-2004, 10:38 AM	#3
JynX Senior Member Join Date: Dec 2002 Location: Sydney Posts: 1,767	Its mainly there to avoid heat damaging the paint on your bonnet. Ive had mine off for over 2 years and the paint hasnt bubbled yet. Nothing some well placed heat shield cant fix anyway. __________________ JynX 1994 Turbo BA Astina 200whp @ 12psi "If you cant drive fast with 90hp..... 900hp wont help you"

23-02-2004, 03:19 PM	#5
Toyboy Senior Member Join Date: Jul 2002 Location: nsw Car: Ba Astina Posts: 1,113	That little extra engine noise isnt nice when your HLA's are shot :P Id prefer to keep the insulation to protect your paint,if not keep your bonnet well polished and waxed 8) __________________ "Man who drop watch in toilet have ****ty time."

25-02-2004, 02:57 PM	#7
BigMal 1ST BA TURBO MEMBER Join Date: Mar 2002 Location: Sydney Car: BA Astina Turbo Posts: 4,195 View Photos By: BigMal	Remove the front and rear rubbers on the bonnet to allow air to flow through to stop any chance of paint peeling on the bonnet. Years of driving around with a BPT and the only damage my bonnet doesn't have is peeling from heat. Stone chips, bent and busted is another story altogether. Mal __________________ If you want wind in your hair add a Hairdryer !!!

25-02-2004, 04:00 PM	#10
Rupewrecht Administrator Join Date: Mar 2002 Location: melb.vic.au Car: AZ-1, Astina Hardtop Turbo, BJ Protege, Beetle Posts: 16,525 View Photos By: Rupewrecht	into the engine bay, perhaps, but the drop in temperature is worth it as far as i'm concerned. and my engine bay is dirty anyway. darn dirt roads! __________________ jdmparts.rupewrecht.com Sourcing your not-quite-overnight parts from Japan WRECHT--\|--SLOWTEGE--\|--BEETLE--\|--SUBSTITUTE--\|--AZ-1

23-02-2004, 10:20 AM	#2
twilightprotege Driving a faster car now! Join Date: Oct 2003 Location: Work, always at bloody work... Car: Lotus ....... . Posts: 5,217 View Photos By: twilightprotege	just rip it off and leave it off. save yourself some money

23-02-2004, 11:06 AM	#4
twilightprotege Driving a faster car now! Join Date: Oct 2003 Location: Work, always at bloody work... Car: Lotus ....... . Posts: 5,217 View Photos By: twilightprotege	i've taken it off on my previous 2 cars. the last one was off for 5 years, no prob. my sp20 has been off since i got it (coming up 3 years). no problem at all. anyway, that bit extra engine noise is noice

23-02-2004, 09:52 PM	#6
st11x Junior Member Join Date: Feb 2004 Posts: 68	Thanks for the thoughts guys. I'll probably keep it on for the time being since I've already spent 40 bucks on it. When it falls off again, I wouldn't rush to get a replacement for sure. This is the first car that I've seen with that sheet under the bonnet though. I do agree the sound sure feels good :wink: when driving. Matt

25-02-2004, 05:12 PM	#11
jcywong AstinaGT Regular Join Date: Jul 2003 Location: Sydney Car: saf Posts: 333 View Photos By: jcywong	I only remove the back seal so it can allow hot air out from under the bonnet. i did not remove the front one so nothing can come into under the bonnet __________________ mY rIdE

25-02-2004, 08:53 PM	#12
twilightprotege Driving a faster car now! Join Date: Oct 2003 Location: Work, always at bloody work... Car: Lotus ....... . Posts: 5,217 View Photos By: twilightprotege	having water in the engine bay is no problem at all. they are designed for that (within reason of course). take your car for a drive on very wet roads while it's raining and the engine bay will all be soaked no matter what you leave on or remove. as rupe said, 5 degrees decrease in temp is worth it

25-02-2004, 09:18 PM	#13
Cosmo Dude コスモ Join Date: Dec 2002 Location: Location: Vic Car: Mazda '95 Astina I4, '86 B2K and '10 3 MZR-CD Posts: 7,888 View Photos By: Cosmo Dude	I'd only remove the rear rubber, the area around the windscreen wipers is an area of low preasure and as such air will be drawn from under the hood and over the roof. The engine bay will then need to get more air from somewhere... either from underneath or through the radiator. If it's through the radiator then the cooling system, A/C and FMIC will benefit If it's from under the car then welcome (so very very very very very very slightly) to the world of ground effects. In the long run drawing hot air from the engine is better than trying to ram cold air around it __________________ My 'stina Hatch

26-02-2004, 12:39 AM	#15
jcywong AstinaGT Regular Join Date: Jul 2003 Location: Sydney Car: saf Posts: 333 View Photos By: jcywong	i afraid it will wet my pod filter if i remove the front seal __________________ mY rIdE

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