LFA

Hi everyone,
I bought a new firewall from Porsche for my 1991 GT. The car currently is an empty shell and the engine bay is newly painted (and has clear coat on it).
Should I just put the firewall without any adhesives or do you recommend a better installation of the original firewall.
Thanks for your help,
Evren

FLYVMO

Use adhesive would be my recommendation. The insulation is both a vibration damper and heat insulator (the silver part). I used a different insulation for my GT project (also fresh paint and clear coat on the firewall) but since you already have a brand new one from Porsche I would suggest gluing it on as the original was.

Cheers!
Carl

LFA

Hi Carl,
Thanks for your recommendation. I am following your project, very impressive one. My car is similar, a 1991 GT. The interior was sandblasted with walnut shells. I tried to find damplifier pro and VB-2SP here and now using Dynamat Extreme and Wurth products for sound insulation of the interior. The engine is being fully rebuild with new pistons.
If I recall correctly the factory firewall is not glued. There is some insulation material on top of the metal similar to underbody but no adhesive. As this is a hot area, I assume there should be special adhesives to endure that heat. Do you recommend any product, European brands are much easier to find here.
I will post pictures once I figure out how I can do that.

Thanks and best regards,

Evren

FLYVMO

Hi Evren,

Both my firewall insulations (86.5 and the GT) were glued on. Interesting if yours was not, I wonder if it has been replaced before? I'm not sure what adhesive Porsche used for the firewall insulation, but I would think any high temperature automotive spray adhesive would work, as it will not be directly facing a heat source. The silver foil insulation should reflect most of the heat. The DEI tunnel/firewall insulation I used has an adhesive capable of 450 degrees F. The Dynamat Extreme works well, but I had lots of "goo issues" with it here in the Florida heat, and it would get on everything. One way to get around that is to make sure you seal the edges with aluminum tape or similar. What part of the world is your car located?

Sounds like you have a great project going, I hope you post some before/after pictures for everyone to see.


Cheers!
Carl

LFA

Hope these pictures will be posted

FLYVMO

Wow, that looks nice and shiny! Did all the 91GT's have a full coverage of that silver foil? Mine only had the lower half covered. Very nice! How did the walnut shells work out on the interior? Any issues getting shells in every nook and cranny?

Carl

LFA

Carl Hi,
I will try to find an high temp adhesive. I currently live in istanbul. I now have five 928s; 1987, 88, 89, 90 S4s and one 91 GT. They all need to be repaired and I started with 2 of them 91 GT and 88 S4 . I am buying lots of parts parts from Germany. 1991 GT is painted and 88 is currently being painted. The engine bay , interior and underbody is painted, the rest has only one layer of base coat. Once the engine and powertrain is back on the body, body panels, doors will be put on and the entire body will get painted with last coats. I have the side marker delete, door lock delete, rear wiper delete. The 91GT and 88 S4 will be midnight blue metallic, 37W.
Thanks for your help,
Best,
Evren

LFA

I first tried sandblasting with soda but it did not clean the interior that good. Wallnut shells worked fine. I managed to get a rotiserie for working on the underbody and that helped a lot to get the walnut shells out.
The original firewall on both the 88 S4 and 91 GT was similar to this new pieces. I also bought the big moulding under the rear seats from Porsche which was almost impossible to remove in one piece.

FLYVMO

Very nice collection you have going there. I did the same thing with the rear seat insulation, I ordered a new one from Porsche as the complex shape makes it hard to re-make by hand. The old one completely fell apart when I took it out. Midnight blue metallic is a great color, I think that is a great choice. I hope to see the entire collection posted here someday.

Cheers!
Carl

LFA

Here are some pictures, some before and some work-in-process

LFA

some more

Mrmerlin

if your going to use an adhesive to secure that firewall insulation,
I would suggest to use Weldwood contact cement in the red can,
its a brush on product, you may have to do some searching since your not in the USA.
IMHO I have not found any spray adhesive that lasts longer or works better than the Weldwood.

JHowell37

How much did that new insulation set you back?

Mrmerlin

>>

FLYVMO

It was surprisingly affordable (for a complex Porsche part...), think I paid $270 for it. For me it was worth getting the correct fit and curvature in that complex area.

Carl