Go Back   EcoModder Forum > EcoModding > EcoModding Central
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 10-08-2017, 03:13 PM   #1 (permalink)
EcoModding Lurker
 
Join Date: Sep 2016
Location: san antonio
Posts: 14
Thanks: 0
Thanked 0 Times in 0 Posts
Reducing NVH

Anyone have any tips to reduce NVH in your CRX's? I'm running a bone stock 91 CRX HF and am rebuilding this car with MPG and daily drivability in mind. The car is pretty loud and was hoping people had tips on some low hanging fruit to reduce noise and vibrations to the cabin. It seems the POLY inserts in the rear engine mount were a bad idea though, lol, which is a shame because the car becomes much more responsive on the road.

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 10-09-2017, 09:53 PM   #2 (permalink)
Spaced out...
 
spacemanspif's Avatar
 
Join Date: Jul 2013
Location: Dirty Jersey
Posts: 700

The Focus - '07 Ford Focus ZXW SES
Team Ford
90 day: 36.19 mpg (US)
Thanks: 116
Thanked 192 Times in 139 Posts
Some of the thin dynomat will help without adding too much extra weight to the car.
__________________
-Mike

2007 Ford Focus Estate - 215k - SGII, upper grill block, partial lower grill block and roof rack delete
1987 Monte Carlo SS - 5.3/4L80E swap - 13.67@103.7
1995 Saturn SL2 - 256K miles - 44mpg - Retired - Sorely missed
Cost to Operate Spreadsheet for "The Focus"


  Reply With Quote
Old 10-11-2017, 10:21 AM   #3 (permalink)
EcoModding Lurker
 
Join Date: Sep 2016
Location: san antonio
Posts: 14
Thanks: 0
Thanked 0 Times in 0 Posts
Where are the best places to put it?
  Reply With Quote
Old 10-11-2017, 11:12 AM   #4 (permalink)
Master Novice
 
elhigh's Avatar
 
Join Date: Jan 2008
Location: SE USA - East Tennessee
Posts: 2,086

Josie - '87 Toyota Pickup
90 day: 29.48 mpg (US)

Tiptoe - '03 Honda Civic Hybrid
Team Honda
90 day: 48.9 mpg (US)

Felicia - '09 Toyota Prius Base
90 day: 48.44 mpg (US)
Thanks: 346
Thanked 501 Times in 366 Posts
When I still had it, my Dodge Caravan appeared to be a collection of parts flying in close formation, and none were especially respective of each others' personal space. It was a rattly, squeaky disaster.

I spent a couple of hours one weekend before a big trip, taking every interior panel off and reinstalling it with a thin piece of leather under each contact point. I got the leather from a messed up jacket someone was throwing away, so my entire investment in the project was time. It helped a lot, but it wasn't everything. An old CRX should have some opportunities for you to find attachment points and make necessary modifications.
__________________




Take it easy
  Reply With Quote
The Following User Says Thank You to elhigh For This Useful Post:
Daschicken (10-18-2017)
Old 10-11-2017, 04:32 PM   #5 (permalink)
Custom User Title
 
Gasoline Fumes's Avatar
 
Join Date: Oct 2009
Location: New York State
Posts: 1,007

Nut Wagon - '91 Honda Civic Wagon DX
Team Honda
Wagons
90 day: 73.36 mpg (US)

CRXFi - '88 Honda CRX XFi
Thanks: 426
Thanked 424 Times in 241 Posts
I think Dynomat works best on larger thin metal panels. Your CRX has some tar-like matting already. I usually scrape the factory stuff out because it's heavy. I don't notice a difference in noise.

My Wagon with a gutted interior is really loud inside. It's mostly tire noise. Insulating the floor and wheelwells should help.

I want to make my CRX a lot quieter than my Wagon without adding much weight. Please post any noise reduction results here.
__________________
Best tank with the Honda so far is 81 MPG.
  Reply With Quote
Old 10-11-2017, 08:45 PM   #6 (permalink)
Spaced out...
 
spacemanspif's Avatar
 
Join Date: Jul 2013
Location: Dirty Jersey
Posts: 700

The Focus - '07 Ford Focus ZXW SES
Team Ford
90 day: 36.19 mpg (US)
Thanks: 116
Thanked 192 Times in 139 Posts
I'd do was gasoline fumes mentioned about dynomat on the wheel wells and floors and add that a piece on the roof will help too. Some NVH can be address by just making things tighter like elhigh did in the interior but also making sure exhaust hangers are tight too....at 2000rpm my Focus exhaust rattles like crazy in the cold. New Weatherstripping for the trunk and doors will help reduce wind and road noise too if yours has seen better days.
__________________
-Mike

2007 Ford Focus Estate - 215k - SGII, upper grill block, partial lower grill block and roof rack delete
1987 Monte Carlo SS - 5.3/4L80E swap - 13.67@103.7
1995 Saturn SL2 - 256K miles - 44mpg - Retired - Sorely missed
Cost to Operate Spreadsheet for "The Focus"


  Reply With Quote
Old 10-11-2017, 08:49 PM   #7 (permalink)
Master EcoModder
 
oldtamiyaphile's Avatar
 
Join Date: May 2009
Location: Australia
Posts: 1,209

UFI - '12 Fiat 500 Twinair
Team Turbocharged!
90 day: 49.6 mpg (US)

Jeep - '05 Jeep Wrangler Renegade
90 day: 18.09 mpg (US)

R32 - '89 Nissan Skyline

STiG - '16 Renault Trafic 140dCi Energy
90 day: 34.55 mpg (US)

Prius - '05 Toyota Prius
Team Toyota
90 day: 50.25 mpg (US)

Premodded - '49 Ford Freighter
90 day: 13.48 mpg (US)

F-117 - '10 Proton Arena GLSi
Pickups
Mitsubishi
90 day: 36.8 mpg (US)
Thanks: 252
Thanked 286 Times in 215 Posts
When you're next to a hard acceleration truck and crack open a window, notice that even the tiniest opening lets in 90% of the noise. Start by sealing up any gaps where factory grommets and seals have degraded over the years.

Second thing I realised about sound proofing is that you'll always be limited by the car's glass, most of the noise in my Renault comes in through the large areas of glass, sound proofing the rest of the car is of little value, unless you have a specific problem.
__________________






  Reply With Quote
Old 10-12-2017, 08:14 AM   #8 (permalink)
Custom User Title
 
Gasoline Fumes's Avatar
 
Join Date: Oct 2009
Location: New York State
Posts: 1,007

Nut Wagon - '91 Honda Civic Wagon DX
Team Honda
Wagons
90 day: 73.36 mpg (US)

CRXFi - '88 Honda CRX XFi
Thanks: 426
Thanked 424 Times in 241 Posts
My Wagon got noticeably louder when I removed the passenger's seat. I'm not sure if the seat was blocking noise from the rear tires or absorbing the noise. Maybe both.

You have poly inserts in the rear engine mount only? Can you take them out and try stiffening the front mount instead?
__________________
Best tank with the Honda so far is 81 MPG.
  Reply With Quote
Old 10-13-2017, 12:50 PM   #9 (permalink)
EcoModding Lurker
 
Join Date: Sep 2016
Location: san antonio
Posts: 14
Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by Gasoline Fumes View Post
My Wagon got noticeably louder when I removed the passenger's seat. I'm not sure if the seat was blocking noise from the rear tires or absorbing the noise. Maybe both.

You have poly inserts in the rear engine mount only? Can you take them out and try stiffening the front mount instead?
The front mount isn't there anymore. I changed my front crossmember to an aftermarket unit and there's no mount there for the motor.


I think i may make an underbody panel for aero reasons and try and seal it well from bumper to bumper. I'm hoping this will reduce some noise as well.
  Reply With Quote
Old 10-13-2017, 02:47 PM   #10 (permalink)
herp derp Apprentice
 
Join Date: Oct 2008
Location: Lawrence, KS
Posts: 996

saturn - '99 saturn sc1
Team Saturn
90 day: 26.22 mpg (US)
Thanks: 41
Thanked 296 Times in 214 Posts
I was thinking about trying to dynamat the floor and up the firewall, then realized good floor mats would essentially do the same thing with almost 0 effort. Got some universal mats from weather tech, and thought they helped

  Reply With Quote
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com