1991 V2500 Suburban sound insulation project

Discussion in 'Interior' started by yevgenievich, Oct 4, 2017.

  1. yevgenievich

    yevgenievich Full Access Member

    Posts:
    2,575
    Likes Received:
    513
    Joined:
    Mar 1, 2014
    Location:
    Texas
    First Name:
    Viktor
    Truck Year:
    1991
    Truck Model:
    V2500 burb
    Engine Size:
    5.7
    Upper door seals kill 70 to 80 % of highway wind noise. They were available in 70's on the squares but were later removed as cost savings(making an assumption on cost savings part). LMC sells new sets, or general 3/4 foam seal can be used instead. Tires are a bit rougher being E range rated. Wanted to ran D range, but tire store was resisting being that I have a 3/4 ton.
     
    Last edited: Jan 12, 2018
  2. yevgenievich

    yevgenievich Full Access Member

    Posts:
    2,575
    Likes Received:
    513
    Joined:
    Mar 1, 2014
    Location:
    Texas
    First Name:
    Viktor
    Truck Year:
    1991
    Truck Model:
    V2500 burb
    Engine Size:
    5.7
    Behind dash is done, back together and already blower fan does not seem to be as loud on high speed as before. Started to prototype under the dash panels, only passenger side in place out of cardboard. Going to run with card board first using same insulation behind it as a test to deside if I should bother with them. tmp_32038-IMG_20180122_2254062813779.jpg tmp_32038-IMG_20180120_2346241817839916.jpg tmp_32038-IMG_20180121_222727843418719.jpg tmp_32038-IMG_20180125_2246171855982606.jpg tmp_32038-IMG_20180203_14351820705107.jpg
     
    74 Shortbed, ajdemello and Dougnsalem like this.
  3. yevgenievich

    yevgenievich Full Access Member

    Posts:
    2,575
    Likes Received:
    513
    Joined:
    Mar 1, 2014
    Location:
    Texas
    First Name:
    Viktor
    Truck Year:
    1991
    Truck Model:
    V2500 burb
    Engine Size:
    5.7
    The cardboard backed by mlv and closed cell foam is in place under the dash. I hope with other firewall insulation this will not make enough difference to bother with making actual panels. Will drive with it for few weeks and get some readings, then remove them and see if there is much difference. tmp_30776-IMG_20180204_2357071039860506.jpg
     
    74 Shortbed and twinturbo427 like this.
  4. yevgenievich

    yevgenievich Full Access Member

    Posts:
    2,575
    Likes Received:
    513
    Joined:
    Mar 1, 2014
    Location:
    Texas
    First Name:
    Viktor
    Truck Year:
    1991
    Truck Model:
    V2500 burb
    Engine Size:
    5.7
    I am reaching a point of diminishing returns. I have now additional drop of 8-9dBm . Cruising highway speed is around 54dBm, down from 64db. Close to the 98 e320 wagon. I still can insulate under the hood better and add a quieter muffler, otherwise I have pretty much reached the limits of the body design. Main noise now comes through the door glass and surrounding the door(due to being uncovered metal).
     

Share This Page