Hoodliner aka bonnet insulator - genuine or aftermarket?

[sunrk]

My 80 has no hoodliner aka bonnet insulator. Being a ye olde tired 625 k km + 80 series with 1hz diesel and aftermarket Genie headers it's rumbly and resonant and very noisy low down in the audio spectrum. Part of that is due to the exhaust (Aussie-made Redback 2.5" system behind the Genie headers), but most is due to the 80 being base model, with almost no NVH insulation damping anywhere in the engine bay or inside the cabin.

Toyota genuine hoodliners (part 53341B with various full numbers depending on build time) are actually not expensive - currently allfourx4 spares here in Australia has them listed at A$198 each and Amayama quotes me A$180 for 53341-60110. Amayama also says there is an OEM replacement with number 53341-60020 pricing at a little less. The kicker with Amayama is shipping as they're huge (not much smaller that an actual hood/bonnet).

This is the detail out of Toyodiy relevant to my 80's build phase:

53341B

INSULATOR, HOOD
53341-60010 (01/1990 - 07/1991) 1 $125.85
53341-60020 (08/1991 - 12/1991) 1 $293.25
53341-60110 (01/1992 - 07/1992) 1 $279.37

I know being a US based forum, the prevelance of belief/interest in Dynamat products is high (!), and even I've looked at Dynamat's hoodliner product before, but have not yet found anyone here in oz with a landcruiser that has that product used under the bonnet.

Tru-Fit carpets which is an Australian maker of moulded vinyl flooring, mats, Resomat, etc. now also does bonnet/hood liner/insulator pads.

Again not seen one yet as they're fairly new. Just wondering that, putting stuff like Dynamat aside, if OEM Toyota bonnet/hood liner/insulators are going to be a better product that aftermarket ones (such as the ones Tru-Fit sells)? I don't yet know the pricing on the Tru-Fit ones (might call up about that today as they're based in Melbourne, VIC).

 

[Notch]

Aftermarket ones could be better than OEM in some cases. The design of the stock one does a good job diffusing high frequency sounds but doesn't have enough mass or the proper materials to do much with lower tones. I'm not sure how much it would really matter for sound except when listening from outside the truck anyway. I would probably set my sights on a combination of mass loaded vinyl and closed cell foam for the interior side of the firewall and floor. This will block a lot of noise from the drivers seat if there is minimal insulation there now.

I plan on replacing mine with some kind of aftermarket material eventually but mostly for cosmetics as I can barely hear my gas engine at idle.

 

[PIPA]

I have no under bonnet/hood insulator too and would love to find out more on what you find out, especially with Tru-Fit. I guess then if it's worth a darned, I'll have to figure out how to get on of those under the bonnet/hood insulator stateside.

 

[ThatMacGuy]

My 96 doesn't have one either. I've been wondering if it was removed by the previous owner, or if it was an option from the factory that was not purchased.

I've thought about adding one, using a Dynamat like product or even a spray on bed liner material. Not so much for the sound dampening, but more for the insulating effect.

 

[RiverCityDave]

I have a 94 with the factory liner, its in acceptable condition, but since my cruiser is my DD I'm always looking for ways to reduce NVH. I plan on installing at least the Dynamat hood liner, and possibly the extreme under it. If I go that route, I may look at putting extreme on, then test fitting the factory liner for cosmetic reasons.