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Old 12-21-2009, 04:30 PM   #1
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Default Transmission tunnel heat shield (liner?)

What transmission tunnel heat shield/sound deadner would you all recommend? I'm thinking about something that would go under the car above the transmission.
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Old 12-21-2009, 04:36 PM   #2
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I used this in my tranny tunnel. Have to replace it every few years though.
BEGi

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Old 12-21-2009, 04:54 PM   #3
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Does that block any sound? My enthuza makes me deaf.
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Old 12-21-2009, 06:34 PM   #4
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I don't know what your exhaust sounds like but try driving with a SD spec miata exhaust for an hour on the highway without 5th great at 70mph. Thats loud. Try it you will be rethinking what you just said. Lol.

Have a great day,
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Old 12-21-2009, 06:47 PM   #5
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How will any tranny tunnel material quiet a loud muffler?

Perhaps a quieter or just an additional muffler would be more useful for that purpose.
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Old 12-21-2009, 07:22 PM   #6
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Heat shield above the tranny would be totally worthless. If you want to block actual heat, it all comes in through the left side of the tranny tunnel, from the downpipe. On a track car with a turbo and no carpets, it will burn your right foot if you aren't careful.

All the noise from your exhaust is coming in through the paper-thin sheetmetal in the trunk, passing through the two huge holes next to the gas tank, and right into the cabin. If you don't believe me, take off your fuel bulkhead cover and see how much louder the car gets.

If the Enthuza is too loud, you should either make it quieter (resonated test pipe, larger muffler) or make your perception of it quieter (earplugs). I used foam-bud headphones for highway drives on a regular basis when I had my catless Enthuza.
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Old 12-21-2009, 09:41 PM   #7
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Quote:
Originally Posted by Savington View Post
Heat shield above the tranny would be totally worthless. If you want to block actual heat, it all comes in through the left side of the tranny tunnel, from the downpipe. On a track car with a turbo and no carpets, it will burn your right foot if you aren't careful.

All the noise from your exhaust is coming in through the paper-thin sheetmetal in the trunk, passing through the two huge holes next to the gas tank, and right into the cabin. If you don't believe me, take off your fuel bulkhead cover and see how much louder the car gets.

If the Enthuza is too loud, you should either make it quieter (resonated test pipe, larger muffler) or make your perception of it quieter (earplugs). I used foam-bud headphones for highway drives on a regular basis when I had my catless Enthuza.
I actually do use earplugs and I have a catless enthuza.

So you recommend heat shielding the area where the downpipe is?

OK
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Old 12-21-2009, 11:12 PM   #8
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It'll block heat, but it's only a problem on track cars. It won't do anything for your loud exhaust.
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Old 12-24-2009, 04:35 PM   #9
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clean the tunnel really well by the dp. Cut
thermal blanket to fit. use the best 3M adhesive on the well and the thermal blanket. Stick the blanket on the well wall. Your done. You only get one shot at though. I've done this on two miata's SC and Turbo. Worked great.
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Old 12-24-2009, 04:43 PM   #10
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Not that it helps you much, but this made my feet on a 105* track day feel like my usual 70-80* track days.
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Coupled with some NACA ducts, I stayed surprisingly cool in 105* weather and the heat on full blast. No bueno for street cars of course. I shove a spray can top in the NACA ducts for normal driving and they leak. They're currently blowing 30* air in my face.
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Old 12-24-2009, 05:24 PM   #11
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I tryed the in car application didn't do too much for me. For the best results you need to block the heat before it soaks into the floor board.
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Old 12-24-2009, 05:51 PM   #12
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Like Sav says, lot's of noise comes through the trunk. The Mnet solution is stuff some fiberglass insulation in some plastic bags. Stuff those in the openings behind the fuel tank bulk head cover on either side.
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Old 12-24-2009, 06:28 PM   #13
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Ooooh I like how cheap and ghetto that is...

This might help:
http://www.targamiata.com/diary.php?UID=519
Keith eventually installed the insulation with some ridiculous waterproof tape (I think he said can even be applied underwater). But I can't find that entry.
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Old 12-25-2009, 12:14 PM   #14
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instead of using fiberglass, you can just go to a fabric / craft store and pick up pre-assembled bags of pillow stuffing and shove those in there. wont get itchy.
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Old 12-25-2009, 07:15 PM   #15
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Quote:
Originally Posted by y8s View Post
instead of using fiberglass, you can just go to a fabric / craft store and pick up pre-assembled bags of pillow stuffing and shove those in there. wont get itchy.

Good idea. And I'll have high frequency absorption while I'm at it. Do you think I should just stuff it in the midpipe and exhaust or should I stuff the downpipe as well? I'm thinking that since I'm increasing the range of the resonant frequencies that my turbo should spool faster throughout the range of the compressor map and be more responsive.
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Old 12-25-2009, 07:36 PM   #16
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You're joking, correct? If not, stay away from cars.

Since post #12, we've been talking about stuffing bags of stuff behind the seats. There's a spot on either side of the gas tank and chassis that you can stuff something in. There's only a thin piece of sheet metal blocking the cabin from the trunk via those two tunnels, and there's a lot of noise in the trunk from the exhaust.
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Old 12-25-2009, 08:38 PM   #17
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Quote:
Originally Posted by curly View Post
You're joking, correct? If not, stay away from cars.

Since post #12, we've been talking about stuffing bags of stuff behind the seats. There's a spot on either side of the gas tank and chassis that you can stuff something in. There's only a thin piece of sheet metal blocking the cabin from the trunk via those two tunnels, and there's a lot of noise in the trunk from the exhaust.
i think that was sarcasm cuz we hijacked his thread about heat from the tranny tunnel.
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Old 12-25-2009, 09:12 PM   #18
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Quote:
Originally Posted by curly View Post
You're joking, correct? If not, stay away from cars.

Since post #12, we've been talking about stuffing bags of stuff behind the seats. There's a spot on either side of the gas tank and chassis that you can stuff something in. There's only a thin piece of sheet metal blocking the cabin from the trunk via those two tunnels, and there's a lot of noise in the trunk from the exhaust.

I think that's ridiculous. If you did that, they would definetly catch fire. I mean, the fuel tank is right there and what do you think the purpose of fuel is? To burn, dumbass.

Since, it's Chistmas, this is for you:

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Old 05-25-2013, 03:37 PM   #19
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I'm reviving this thread because I'm having issues with heat coming from the transmission tunnel. I came across something that I'm interested in trying

1993 Mazda Miata

Using just the reflectix from home depot

Reflectix 4 ft. x 25 ft. Double Reflective Insulation-BP48025 at The Home Depot

The other question is: what holes from the trunk by the gas tank?
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Old 05-26-2013, 12:10 AM   #20
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If you just want coolness, just buy the cheaper version of that stuff and stick it under the carpet. Or if you want to knock some sound down to, you can do the entire drivers half of the floor pan with 2-3 pounds worth of cool mat.
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