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Upgrades (non TDI Engine related) The place of handling, lighting and other upgrades that do not relate to the performance or economy of the TDI engine. In other words upgrades to your TDI that don't fit into TDI Fuel Economy & TDI Engine Enhancements.Please note the Performance Disclaimer

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Old December 2nd, 2014, 11:14   #31
Wankel7
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73-74 db @ 70mph. Using http://www.mcmelectronics.com/produc...9-oRoCnKXw_wcB
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Old January 3rd, 2018, 07:19   #32
Judson
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I just wanted to echo Wankel7's post about the wheel wells...

As you may remember, I was extremely disappointed with my soundproofing results, after the doors, door cards, and the rest of the entire interior from front to trunk was done. I was still seeing 78-80 db at 70mph on a quiet highway.

I recently finished up a big job on the wheel wells. I used "Noico 80 mil 36 sqft car Sound deadening mat" on the liners:

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

And I sprayed the wells using 3M 03584 Professional Grade Rubberized Undercoating - 16 oz.

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

The Noico stuff is flexible enough even in a cold garage to work with, and cuts easily enough to fit the weird shapes of the liners.

I cleaned and scrubbed the wells then taped things off before spraying a full can of the 3M stuff on. I didn't tape off the screw holes, and just was careful to avoid covering them too much. This worked out fine. I didn't just spray the wells in the front, but also the longitudinal braces in the frame - what I could get - as I figured those too transmit noise back into the cabin.

The big struggle was to get the liners back in, as the tolerances had changed with the Noico stuff on them, but I got there. I only couldn't get at one screw in the rear left well, as I needed another pair of hands. Otherwise, they went back in well enough.

The result? Using a new decibel meter (my old one was no longer supported) on an iphone, on the same stretch of highway, I got 71-74 decibels, while my buddy's 2016 GTI read 70-73. That's a six decibel difference, folks, or four times less in sound pressure. I couldn't believe it, so I checked it again several days later and got the same result.

The car still transmits high frequency noises into the cabin, no doubt through the window glass, but otherwise, I'm pretty damned happy and there's more to come.
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Old January 3rd, 2018, 18:39   #33
Rrusse11
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Judson,
So it sounds like, {;o), the best bang for the buck is to do the wheel wells. I've got a bit of a drone with my exhaust at 2k rpm that I doubt deadening the wells would fix. But when the weather gets better,
I'll give it a shot. BOOM to bang ehhhhh.
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Old January 3rd, 2018, 18:54   #34
john.jackson9213
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Judson,

Thank You so much for continuing to post and follow up with your results!!

When I get my TDI Jeep Comanche back home in the spring - this will be the first modification I do to the truck.
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Old January 4th, 2018, 06:04   #35
Judson
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Hey Rrusse11 -

I'm not certain that it's the best bang for the buck, but it sure seems that way. I think any car with very little soundproofing is going to transmit it one way or another. If one only does the wheel wells, then the sound may find its way through the floor and the doors.

I may do the wheel wells of my 04 Jeep Grand Cherokee first just to find out. It has surprisingly little soundproofing anywhere, and could use some quieting for sure.
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Old January 4th, 2018, 07:53   #36
kwong7
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I came back from a 1K miles road-trip (roundtrip) and measured 80-93 decibels from speeds between 35-85mph. It was deafening. It turns out my original rear wheel bearings were toast. Best $250 I spent. I thought all that droning noise was coming from my new tires.
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Old January 4th, 2018, 13:37   #37
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Agreed, you can hear a lot noise thru the wheel wells. I partially did the fronts on my wagon and my wife's, but need to tackle the rear next.
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Old January 7th, 2018, 18:46   #38
VincenzaV
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Did you do the indie of the wheel wheels, or remove the fender liners and do the outside?
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Old January 9th, 2018, 12:54   #39
Judson
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I removed the liners, sprayed on the 3M stuff onto the wheel well, then also lined the inside of the liners with the Noico stuff. So, once assembled I had a double-layer.
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Old January 10th, 2018, 17:40   #40
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Double check body plugs are installed. I've always had a lot of noise at my feet in the wet and snow-since I got the car almost 2 years ago, had it up in the air the other day and never really looked until now, missing both outer front body plugs-nice big air chamber right under my feet and directly in the path of rain/snow etc. Installed some and noticeable reduction in noise.
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2003 GSW, 2.0L ALH, Stage 2 Colt Cam, 1756 turbo, auto, silver, 380k-Wife's.
2004 GSW TDI, blue, 5 speed-DD-Malone stage 2, no kitty, aeroturbine muffler, PD150's.
2003 JSW 1.8T, silver-parting out. 2006 JSW, TDI 5 speed, blue.
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Old January 24th, 2018, 11:23   #41
Judson
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Just had a six-speed installed by Brandon at Metrick Methodz in Fort Collis. It a DRW code, with a PD150 DMF and Quaife courtesy of Darkside. RPMs @ 70=1800, @80=2200. I'd say overall decibels dropped about 1.5-2db, no more. Now at about 69-70db at 70mph, and 73db at 80mph. Yes, that's right: I saw a genuine 69db there.

At idle and around time and just standing next to the engine, it is very smooth, very quiet: a lot like the 2015 TDI I test drove recently.
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Old January 27th, 2018, 16:12   #42
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Judson - In post #23 you state that the door seals are bad and are next. I am curious if you replaced the felt seal that runs along the top of both the front and back doors or the individual seals for each door and if it made a significant difference. I'm running 85 to 90 most of the time between Rapid City and Gillette on I-90 and it seems like there is significant noise from the top of the driver and passenger's windows. I've adjusted the doors in as far as they go and that did make a big difference. I don't know which door seal to replace next.
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Last edited by jettamk4tdisd; January 27th, 2018 at 16:58. Reason: Added signature
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Old January 29th, 2018, 06:29   #43
Judson
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A lot of my highway noise - what I thought was coming through the windows - was eliminated by soundproofing the wheel wells.

Now that The car is much quieter I can hear more little things and yes, I do have some missing felt and a tear in the front door seal that isn’t too bad but needs attention. My doors are also adjusted right up against the body and have been for maybe 10-15 years now.

Sorry I can’t provide more info on this. I have such a long list of things to do to the car (and it keeps growing) that addressing the seals is low priority right now.


Sent from my iPhone using Tapatalk
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Old January 29th, 2018, 06:38   #44
dremd
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I never quite understood what parts you sound dampened.

The plastic wheel well liners?
The metal that the plastic attaches to?
Both?

I’m definitely considering doing the same, maybe to my EV’s as well.
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Old January 30th, 2018, 08:50   #45
Judson
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Both.

I took off the plastic wheel well liners and soundproofed them using:

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

I also protected with newspaper/taped off the strut/spring/brakes/etc. in the wheel well and then sprayed a whole can of 3M stuff on the wheel well:

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
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2001 Jetta TDI, converted to manual, black leather/red stiching, PP520s, rc4, franko6 cam, 11mm pump, VNT 17, PD150 intake, EGR/cooler delete, 2.5" Buzzken exhaust, PD150 clutch/flywheel, DRW six-speed, Eurojet intercooler, 3bar MAP, FIS Cluster, Cupra bushings, Koni Reds/stock springs, Alpine iLX-207, foglights, Indiglo boost gauge, Longbeach wheels, Euro wood steering wheel, lift pump, Gentex autodim/homelink mirror.
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