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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Fri, Sep-21-2018, 07:33:48 PM   #1
Braymond141
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Default Gauging interest in a trans tunnel insulation sag fix

If you've ever been under an OE car, you have probably seen a sagging transmission tunnel insulation rubbing on the giubo and driveshaft. There are several methods to fix this; cut it off (tacky), tape/glue (won't last), nutsert/weld new mounting points (nice), or replace it completely (it will just sag again and it's a PAIN).

I came up with a simple bolt in method while working on another members car a few weeks ago. I cut his insulation (reluctantly) and was annoyed that it still sagged into the giubo. I did this after reinstalling his transmission, so cutting it further wasn't an option. Insert Rev1 trans insulation brackets (for cut insulation only).



This was a simple and effective design. Plenty of gap to not hit the trans tunnel when under loads and clear the giubo. They mount on top of the transmission ears bolting in with the trans mount studs. No change in the transmission mounting position. Install takes just a few minutes.



Not wanting to cut the insulation on future projects, the simple bracket design wasn't enough to hold up full length insulation. See here;



Here is my Rev2 solution for that;



You're looking at the right side bracket (they are side specific) with the peak of that triangle portion extending 8" towards the rear of the car to hold the insulation back into it's original position. 10 gauge steel, possibly aluminum (to keep it light) will be used.

Anyway, what are your thoughts? The second revision are being laser cut in the next week, no install photos yet.

Last edited by Braymond141; Fri, Sep-21-2018 at 07:37:51 PM.
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Old Fri, Sep-21-2018, 09:38:56 PM   #2
GG///M3
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Default Re: Gauging interest in a trans tunnel insulation sag fix

Pretty fancy idea


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Old Fri, Sep-21-2018, 10:06:48 PM   #3
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Default Re: Gauging interest in a trans tunnel insulation sag fix

Hell ya!
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Old Fri, Sep-21-2018, 10:53:18 PM   #4
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Default Re: Gauging interest in a trans tunnel insulation sag fix

Sign me up for a set!
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Old Fri, Sep-21-2018, 11:00:55 PM   #5
Blaikenstein
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Default Re: Gauging interest in a trans tunnel insulation sag fix

Good work on creating a solution!

I cut mine and it looks like crap but Iím planning on doing gold tape through the area into the engine bay.
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Old Sat, Sep-22-2018, 01:55:25 AM   #6
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Default Re: Gauging interest in a trans tunnel insulation sag fix

I'd buy one.
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Old Sat, Sep-22-2018, 01:56:36 AM   #7
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Default Re: Gauging interest in a trans tunnel insulation sag fix

This is great for those who want a fix with the trans installed. If the trans is out, I recommend removing the old disintegrating factory insulation that rains fibers in your eyes if you touch it with DEI or similar stick on fiberglass heat reflective tape or sheets — I have used both and they work great. If you just remove the insulation and put nothing in its place, you may feel heat through the tunnel in hot weather though there is insulation under the carpet inside that limits the intrusion. If you use a heavy replacement rather than the thin stick on, such as the thicker aluminum sheets made for tunnels, you will have little clearance for the trans. I love the ease with which I can reach the trans bolts or remove and install the slave with the DEI style tape or sheets. But for most, that is not an issue since you wont be doing those jobs often — I have broken a couple of trans and fused a couple of clutches due to excess power (500+ lbs rear wheel torque from turbo S52).
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Old Sat, Sep-22-2018, 02:31:08 AM   #8
Braymond141
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Default Re: Gauging interest in a trans tunnel insulation sag fix

Great options pbon. I ran for 4 years with mine completely removed. Made transmission work such a breeze. The next redndition of my 96 a new OEM insulation is already on hand.
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Old Sat, Sep-22-2018, 04:05:00 AM   #9
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Default Re: Gauging interest in a trans tunnel insulation sag fix

Sign me up. You get so used to staring at the insulation touching the guibo that it starts to look normal (until you realize how much itís sagging).




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Old Sat, Sep-22-2018, 04:24:30 AM   #10
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Default Re: Gauging interest in a trans tunnel insulation sag fix

I thought I was dealing with a unique problem, but no, there are many of you!

Definitely interested. It was really frustrating when I had to give up and let the insulation continue sagging.
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Discussing Gauging interest in a trans tunnel insulation sag fix in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)