Making a 914-6 Conversion your own, The Quest for Quiet Options

[mepstein]

Noise canceling earbuds make a huge difference and are a lot cheaper and easier than mods to the car. I have a couple sets that I use for riding my indoor bike trainer. Even the $20 set that I bought off Amazon work great.
I’m often driving an older diesel pickup that’s pretty noisy. The earbuds help immensely. I can also talk on the phone hands free in a normal voice. I feel like driving is less tiring when the environment is quieter.
If the earbuds aren’t your thing, I get it but they are definitely worth trying if the noise is getting to you when you’re on the road. I wish they were around in the 80’s when I used to drive my 914 on long trips.

[930cabman]

I am interested in the laminated window you referenced. I wonder how much it quiets it down.

Being a window guy, we utilize laminated glass from time to time as it does have sound "reduction" qualities. I have not delved into this deeply, but I know it works and AFAIK the rear glass is flat, making things much easier

[Root_Werks]

Picked up the new window yesterday. Shop did a really nice job with the edges. It's roughly 50thou or 3/64" thicker than the stock window. Glass was only about $100 and it was $125 to cut.

I won't be able to put everything back together until early February. Dropped the backpad off to get re-glued and that will take the longest. Upholstery shop is just that busy.

New seal should be here from 914Rubber pretty soon so at least I'll be able to post how the slightly thicker glass fits against the three targa pieces.

Original on top, new laminated on bottom:

[mb911]

If it works I might have to have one made locally or you will be supplying all of us (IMG:style_emoticons/default/biggrin.gif)

[technicalninja]

$225 for custom dual pane laminated glass seems CHEAP!

Way cool upgrade!

I'm interested in how well this works for noise reduction.

Some modern cars come with dual pane safety glass with a dedicated airspace for exactly this reason. Those aren't laminated with the glue layer.

[mlwbob37]

@Root_Werks , when you say Bursh, do you mean Dansk? Also, is this a stock Dansk or the sport one?

I have been thinking about what muffler to use with my 3.2 that will be equipped with Ben's beautiful SS heat exchangers/headers. (IMG:style_emoticons/default/drooley.gif)

I am looking for a single output and quiet.

Seems like the stock /6 muffler might be restrictive for the 3.2. Maybe not the best example but this /6 conversion in the classifieds has quite a step from the headers collector tubes to the inlet of the stock /6 banana mufler. I would assume this creating some restriction... (IMG:style_emoticons/default/confused24.gif)



I do have the SS 1-in 1-out from the 3.2 original exhaust system and have been wondering if it could be converted to a 2 in 1 out somehow. I would appreciate if you could post a link of that modification.

Happy Thanksgiving! (IMG:style_emoticons/default/beerchug.gif)

I think that pic is of the car I just bought? Found it here on Classifieds.

[flat4guy]

$225 for custom dual pane laminated glass seems CHEAP!

Way cool upgrade!

I'm interested in how well this works for noise reduction.

Some modern cars come with dual pane safety glass with a dedicated airspace for exactly this reason. Those aren't laminated with the glue layer.

following. Summer time is great - winter is a little noisy in the cabin with top on and windows up. Running a 3.2L

[mb911]

$225 for custom dual pane laminated glass seems CHEAP!

Way cool upgrade!

I'm interested in how well this works for noise reduction.

Some modern cars come with dual pane safety glass with a dedicated airspace for exactly this reason. Those aren't laminated with the glue layer.

following. Summer time is great - winter is a little noisy in the cabin with top on and windows up. Running a 3.2L

(IMG:style_emoticons/default/agree.gif) same thing for me with a hot 2.4

[Root_Werks]

Installed the window today and put the two side pads on to keep pressure on the seal. It was 45 degrees out, so the butyl was very slow to compress. All in all, the window seemed to install pretty much the same as the factory. The 3/64" extra thickness didn't impact the installation. More the cooler temp did.

I'll let it sit like this for a few days, let the seal continue to compress a little. I'll be adding a 3rd brake light, that's why I didn't install the longer targa pad yet.

More to come.

[mb911]

Installed the window today and put the two side pads on to keep pressure on the seal. It was 45 degrees out, so the butyl was very slow to compress. All in all, the window seemed to install pretty much the same as the factory. The 3/64" extra thickness didn't impact the installation. More the cooler temp did.

I'll let it sit like this for a few days, let the seal continue to compress a little. I'll be adding a 3rd brake light, that's why I didn't install the longer targa pad yet.

More to come.

Awesome and interesting about a 3rd brake light

[Cairo94507]

I remember on my first 914 in '74, I wanted the rear window tinted so I went to a plastics place and bought a sheet of 3/16" of 1/4" dark smoked plastic. I asked then to cut it to a pattern I made off my rear glass and they did that for a small fee. I was able to slip it in up against the inside of the rear glass and the B pillar and top Targa trim held it tightly in place. I used electrical tape to run a strip along the bottom of the plastic to seal it. It never moved or made any noise and looked good. (IMG:style_emoticons/default/shades.gif)

[JamesM]

If you want to maximize sound comfort, before you put your rear window in completely strip your interior, tar boards and all, and spray every metal surface with Lizard skin including back side of the dash frame and pedal board (if you have a metal one). It takes all the resonance out of the cabin surfaces and gives the car a very solid, high end feel. Then you can add all your additional sound blocking pads back over the top of it.

Time consuming and not cheap, but worth it. I did it on my autocross car and even without adding any additional sound blocking on top of it made a huge difference, bonus it doesn't weigh very much.

[mb911]

If you want to maximize sound comfort, before you put your rear window in completely strip your interior, tar boards and all, and spray every metal surface with Lizard skin including back side of the dash frame and pedal board (if you have a metal one). It takes all the resonance out of the cabin surfaces and gives the car a very solid, high end feel. Then you can add all your additional sound blocking pads back over the top of it.

Time consuming and not cheap, but worth it. I did it on my autocross car and even without adding any additional sound blocking on top of it made a huge difference, bonus it doesn't weigh very much.

I didn’t do that I used noico sound mat. Still too noisy for me with the roof on.