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mtnride1
Samba Member
Joined: March 30, 2011
Posts: 194
Location: la quinta, CA
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 Posted: Sun Aug 27, 2017 10:21 am Post subject: Re: How do you quiet a poptop? |
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I have an 87 westy and mine is pretty quiet I insulated all doors and used dyna mat and I put a couple of pieces of foam from those floaty things in some holes under the van around the a pillars (got that idea off samba). I just got back from an 800 mile trip driving 70 sometimes and the van is quiet.
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87 westy 2wd (NED) |
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rmcd
Samba Member
Joined: October 29, 2010
Posts: 1349
Location: PNW - its a dry rain.
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| Posted: Sun Aug 27, 2017 10:35 am Post subject: Re: How do you quiet a poptop ? |
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| dgbeatty wrote: |
I have been toying with "air tabs" and other small turbulator type devices for the last couple of years. The placement and results have been a bit counter intuitive to say the least but progress is being made. |
Did you find a pattern for noise reduction or mileage changes with your air tabs experimenting? Eager to learn?!
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VW LT40 build. Like a Vanagon but 30% larger in every direction and 40% slower even in metric.
https://www.thesamba.com/vw/forum/viewtopic.php?t=749359&highlight= |
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Merian
Samba Member
Joined: January 04, 2014
Posts: 5212
Location: Orygun
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| Posted: Sun Aug 27, 2017 11:39 am Post subject: Re: How do you quiet a poptop? |
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if he means winglets, they can help when placed near the extremes (sides) of a wing
filling in the luggage well seems to be a major tmt. to do - I have a bag I can use up there if filled with foam noodles, etc. (thing is, I usually drive with the windows down so haven't tried it in the last few years)
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Tom Powell
Samba Member
Joined: December 01, 2005
Posts: 4855
Location: Kaneohe
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| Posted: Sun Aug 27, 2017 1:46 pm Post subject: Re: How do you quiet a poptop? |
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Vortex generators are installed on the upper wing surface to energize the boundary layer and lower the stalling speed. They are evident on B737's and other aircraft.
They've also been used at the back of the roof on cars to improve aerodynamic efficiency.
Here's a set I'm thinking of trying installed on the front of the luggage rack. Don't know if they will reduce noise or increase it.
https://www.aliexpress.com/item/Free-Shipping-Shar....15.qQPe1t
At any rate they would look cool on my recently purchased, lifted, with big tires, 2WD poptop, that the PO tried to make look like a Syncro.
Aloha
tp |
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Merian
Samba Member
Joined: January 04, 2014
Posts: 5212
Location: Orygun
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| Posted: Sun Aug 27, 2017 2:31 pm Post subject: Re: How do you quiet a poptop? |
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that's likely what he meant by air tabs - I doubt if they will do anything on a subsonic Vanagon but you can see
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djkeev
Samba Moderator
Joined: September 30, 2007
Posts: 32632
Location: Reading Pennsylvania
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dgbeatty
Samba Member
Joined: October 26, 2006
Posts: 702
Location: Sacramento
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| Posted: Sun Aug 27, 2017 3:28 pm Post subject: Re: How do you quiet a poptop? |
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Airtabs™ are patented, unique wishbone shaped vortex generators designed to increase vehicle aerodynamic performance End of promotional text
They seem to work as advertised "airtab.com"
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Tom Powell
Samba Member
Joined: December 01, 2005
Posts: 4855
Location: Kaneohe
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| Posted: Sun Aug 27, 2017 3:47 pm Post subject: Re: How do you quiet a poptop? |
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| dgbeatty wrote: |
Airtabs™ are patented, unique wishbone shaped vortex generators designed to increase vehicle aerodynamic performance End of promotional text
They seem to work as advertised "airtab.com"
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I've emailed them asking if it would reduce the cabin noise level created by the luggage rack when installed on the leading edge.
Aloha
tp |
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Merian
Samba Member
Joined: January 04, 2014
Posts: 5212
Location: Orygun
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| Posted: Sun Aug 27, 2017 5:40 pm Post subject: Re: How do you quiet a poptop? |
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their answer will be positive but vague
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Steve M.
Samba Member
Joined: July 30, 2013
Posts: 6833
Location: Fort Lauderdale, Fl.
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| Posted: Sun Aug 27, 2017 6:47 pm Post subject: Re: How do you quiet a poptop? |
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| djkeev wrote: |
I mention that my luggage carrier front lip vibrates at 40 mph making a horrible noise.
I'm prepping for an 8,000 mile journey........ it would be nice to do it without my roadside stick!
Today I opened the front screw holes in the fiberglass into slots.
I sat in the rack and put my weight on the front edge as I tightened the screws, now for a test drive!
I also removed three years of dirt and wasp nests!
From the dirt build up, I'd say that removal once every five years or so would be sufficient.
Dave |
I had one I bought that was rusted through the roof along both sides because of the debris collected under it. I'd be checking it every season.
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This free advice is worth exactly what you paid for it.
There are seven days in a week. Someday is not one of them. |
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Jeffrey Lee
Samba Member
Joined: February 04, 2014
Posts: 1488
Location: Wisconsin
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Jeffrey Lee
Samba Member
Joined: February 04, 2014
Posts: 1488
Location: Wisconsin
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| Posted: Sun Aug 27, 2017 7:12 pm Post subject: Re: How do you quiet a poptop? |
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Saw this in another Samba thread:
Note the luggage rack plug and AirTabs on the roof trailing edge.
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Tom Powell
Samba Member
Joined: December 01, 2005
Posts: 4855
Location: Kaneohe
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| Posted: Sun Aug 27, 2017 7:16 pm Post subject: Re: How do you quiet a poptop? |
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| Jeffrey Lee wrote: |
Saw this in another Samba thread:
Note the luggage rack plug and AirTabs on the roof trailing edge. |
Somebody did a lot of thinking. I'd like to hear his comments.
Aloha
tp |
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rmcd
Samba Member
Joined: October 29, 2010
Posts: 1349
Location: PNW - its a dry rain.
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| Posted: Sun Aug 27, 2017 7:17 pm Post subject: Re: How do you quiet a poptop? |
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| dgbeatty wrote: |
Airtabs™ are patented, unique wishbone shaped vortex generators designed to increase vehicle aerodynamic performance End of promotional text
They seem to work as advertised "airtab.com"
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Where did you place them? Any improvements in sound, stability or mileage? Thanks for experimenting!
_________________
VW LT40 build. Like a Vanagon but 30% larger in every direction and 40% slower even in metric.
https://www.thesamba.com/vw/forum/viewtopic.php?t=749359&highlight= |
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Steve M.
Samba Member
Joined: July 30, 2013
Posts: 6833
Location: Fort Lauderdale, Fl.
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| Posted: Sun Aug 27, 2017 7:25 pm Post subject: Re: How do you quiet a poptop? |
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| Jeffrey Lee wrote: |
Saw this in another Samba thread:
Note the luggage rack plug and AirTabs on the roof trailing edge. |
The pieces of yarn taped down I mentioned earlier would allow you to see the before and after effect.
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This free advice is worth exactly what you paid for it.
There are seven days in a week. Someday is not one of them. |
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dobryan
Samba Member
Joined: March 24, 2006
Posts: 16505
Location: Brookeville, MD
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dgbeatty
Samba Member
Joined: October 26, 2006
Posts: 702
Location: Sacramento
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| Posted: Sun Aug 27, 2017 8:46 pm Post subject: Re: How do you quiet a poptop? |
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They would be more effective placed at the front. It is very possible/likely that with a set at the front edge of the poptop the set at the rear would become effective.
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Sodo
Samba Member
Joined: July 06, 2007
Posts: 9618
Location: Western WA
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| Posted: Sun Aug 27, 2017 8:55 pm Post subject: Re: How do you quiet a poptop? |
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| kourt wrote: |
| I have also put FatMat on a small area of the inside of the sheet metal body underneath the luggage carrier. That has helped turn what is normally a big timpani drum into an acoustically dead piece of sheet metal. You have to remove the headliner panel in order to do that work and you only need to cover a small percentage of the total sheet metal surface area to gain the intended deadening effect. |
Would it be easier to remove the luggage carrier and stick the FatMat sound deadener to the outside, under the carrier? It looks like just a few bolts.
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'90 Westy EJ25, 2Peloquins, 3knobs, pressure-oiled GT mainshaft, filtered, cooled gearbox
'87 Tintop w 47k 53k, '12 SmallCar EJ25, cooled filtered gearbox
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dhaavers
Samba Member
Joined: March 19, 2010
Posts: 7757
Location: NE MN (tinyurl.com/dhaaverslocation)
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| Posted: Sun Aug 27, 2017 9:02 pm Post subject: Re: How do you quiet a poptop? |
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Been there...done this:
Yes, it's quieter with the panel than without, but it seems there are other much noisier
areas. I also have sound deadening under the front carpet & on sheet metal forward of
the dash, plus all new window seals & clear duct tape covering the rain gutters on the
A pillars. All help to a certain degree, but there's always more to do/try... 
I haven't installed my front-door-leading-edge-seals yet, but I expect good things
when I do...(borrowed pic):
I also need to stuff the bottom of the B pillars as suggested.
- Dave
FWIW: https://www.thesamba.com/vw/forum/viewtopic.php?p=6170681
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86 White Wolfsburg Westy Weekender
"The WonderVan"
<EDITED TO PROTECT INNOCENT PIXELS> |
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Merian
Samba Member
Joined: January 04, 2014
Posts: 5212
Location: Orygun
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| Posted: Sun Aug 27, 2017 9:20 pm Post subject: Re: How do you quiet a poptop? |
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Those airtabs should not be right at the rear but I am not sure how far forward they ought to be placed on a Vanagon to provide whatever modest effect they might provide. That would involve a fair amount of calculations and soe data too.
Filling in the luggage well is the first thing to do.
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