Editing Sound Deadening (section)

==Rattling Bumpers==

Hey Everyone, I've finally decided to put this thread up on what i did to combat some of my boot rattle, mainly the rear bumper! The rear bumper is two pieces, plastic skin, and reinforcement bar,the rattles occur mainly between the two, and as you all know, the sides of the bumpers that you can hear in the cabin!!!! Way to over come this problem is to add mass to all areas where there is any kind of gap.

Things you will Need to this:
- a weekend if you have never done it and LOTS of patiants took me 7 hours all up!
- basic tools including ssockets, wrenches screw drivers
- a good stanley knife
- PREPSOL, this is very important!
- and lastly some sound deadener, heres the interesting bit, I didnt use sound deader that you buy at auto barn for $180 or what not, all it really is, is tar with aluminium on it, which what is used inside house gutters for repairs, and means you can get it cheap at bunnings  Grin
heres a pic, get 2 rolls of the 35metres by 100mm wide, this will do your whole bumpe easily and cost about $70

[[Image:Sdead_1.jpg]]

First Step, get the rear bumper off!, there are four bolts under the car that need to be undone, 8 little bolts insidea the boot on either side of the boot ( behind the rear tyre, and behind where the stock jack goes) and finally theres 2 screws on each side of the car under the rear gaurds! you cant miss them!

Once the bumper is off, take it apart, this includes taking the reo off, and the metal plates on either side of the bumper, in total you should have it 4 pieces.

Then with soap and water watch the inside of the bumper getting all the dirt off, this will save alot of time instead of using litres of prepsol.

Once this is done, on the sides of the bumper, clean the inside with prepsol really well, and let it dry.  and start applying the deadenor,

[[Image:Sdead_2.jpg]]

do this to both sides, and do 2 layers! and do both sides!

Now, there are also two metal side pieces which both have rectanglular wholes,Start by cleaning them with prepsol and  apply the sound deadener over these wholes, on both sides of the metal pieces, and put them back onto the sides , if you have done it right, it should be abit of a tight fit,  and the plastice bit of the bumper should feel quite abit heavier!

[[Image:Sdead_3.jpg]]

Now for reo! once you do the sides, and not  the reo, the middle of the bumper rattles like theres no tommorow! In order to stop this, you need to target the main areas of the bumper skin which sit loose on the reo! mainly the top bit and bottom bit of the reo are the loosest, now, if you really want to eliminate all the rattles, i would recommend 3 layers of this stuff, i've done 2 and i still have a few rattles, but I cant be bothered taking the rear bumper off to do it!

Start by Cleaning with prepsol, make sure ALL dirt is off it, and take your time with this bit, as need to be done well!

[[Image:Sdead_4.jpg]]

[[Image:Sdead_5.jpg]]

If you have any question feel free to pm me and ill do my best to assist! Oh and one last thing, once you have done this, there should be a noticable differene in weight when you lift it up afterwards, i was quite suprised at the difference.

Now, when putting the bumper back on, thee air vent behind the tyre will be an issue, i recommend not taking it off permanently, from my last r31 I found it causes more rattles to take it off then leave it on! so take it off, and before you do take note on how there is about 3 mm of plastic sticking out, take the air vent off and trim this off! then you will have no issues putting the bumper back on!

Cheers '''Steve (mrskyliner31)'''