Engine cover sound insulation

So, I decided to pull my engine cover for the first time to make sure the coolant res cap was not leaking and I expected to see a mostly aluminum panel as the articles show. Instead I saw this: I guess the previous owner thought there was too much engine noise :crazy: I thought about pulling all of it, but it was leaving a lot of black glue residue, so I cut the overlap to get the cover off, but left most of it intact.

Just saw your post. Can you identify what the covering is made of and do you think it helps. I like a good exhaust note but I find the engine drone at low speeds to be annoying.

OK, I'll say it- just don't drive your engine at low speeds (RPM):hilarious: Seriously, even with a Tip or PDK I wouldn't let the engine labor at low RPMs; I can only imagine a drone while doing that (aftermarket exhausts aside.) And, PS- that's some bodacious insulation! The fact that evenever's cutting it out suggests that he thinks it will be better out. It would be cool to find out.

Hello evannever, The material looks like Dynamat without their logo printed on it. I use Dynamat on the top engine cover and engine front access cover. It certainly reduces the engine noise in the passenger compartment when at 'brisk' cruising speeds. This makes long distance driving on Interstate Hwys more pleasant. Just enjoy it.

That is definitely sound deadening material, 150% sure of it. Good call Carmona Red. Evannever if you are going to take it off put on some heavy duty work gloves or you will cut up your hands very bad. dave-t

I'm not too sure why the previous owner would do that. I love the roar of the engine. That's why we all love going over 4000rpm!!!

the engine cover is typically deadened, doors etc are done for aftermarket stereo installs. dave-t

Hi all, thanks for the replies. I think it is something like dynamat . I haven't worked with it before, but its thick rubbery adhesive on one side and the foil on the top. I have left it on the cover because I'm happy with the overall exhaust note of the car. Ken1.9, I would say that dynamat on the two engine covers might be a good place to start.

Based on the picture and evannever's description, the product appears to be a sound damping mat . I applied a mat product called RAAMmat BXT to the top and underside of the engine cover, and did the same to the front-engine access panel in the cabin. I also applied some damping mat to the body of the car behind the two seats while I was working on the front-engine access panel. On the undersides of both panels, I then applied Dynaliner on top of the RAAMmat BXT. The Dynaliner is an acoustical foam-like product that is specifically designed to absorb noise, unlike the mat, which is designed to convert sound energy into low level heat energy thereby reducing resonance and vibration. To my ears, the application of the said materials has improved the sound quality from the pair of downward-firing Bose subwoofers that "live" on top of the engine cover on my Boxster S. With the top up, it is also the case that the cabin is a bit more quiet, in part because of the reduced transmission whine. The exhaust note seems to come through more cleanly now given that other noises have been reduced. With the top down, the only difference is the better response of the subwoofers. I am happy with the improvements and would do it over again.