Contour Enthusiasts Group Archives Forums Modifications Audio speaker problem

alright i got 2 12's and a 1200 watt JL Audio Amp and i got rattling in my trunk, license plate and this lil piece under my car that is right under the metel molded around my spare on the bottom, and i have not dynomated anything yet. i was woundering if it was really nessicery to spend 100 bucks on dynomatt. I know that you guys have had to go through some sort of problem like this, so if you could post your feed back i would be very gratefull. Also im not sure if the SVT turnks are built better then my 99 SE but has anyone tried to take care of the license plate with just puttin 2 more screws in the bottom of the license plate, like just drill threw the turnk because i dont ahve 2 pre cut holes? alright well please get back to me and thanks alot

i don't even know about the rattling, haven't invested in a big enough system yet.

but my plate has 4 screws to begin with (95-97 style trunk), and it seemed to hold the plate real well. i ended up replacing them with lights, and drilled out the metal below the bottom holes so i could have clearance for the wires. so 2 more screws/bolts would probly help you out a lot.

mine rattles like a [censored], i bent my liscense plate a bit so it couldn't hit as easy and seems like the rattling from the liscense plate stopped.

alright come on guys, i know alot of contours have the system to rattle the trunk, plate and thingy under the car under the molded metal over the spare. does dynomat help that much? guys please let me know how you got the rattling to stop on the 98 and up contours cuz i think the setup on the trunk is different. alright hope you guys have some tips for me, peace and thanks alot for the two who left feedback

It's not that hard really. Use foam insulation tape from the hardware store (sticky on one side) and press strips of it to the back of your license plate. Then use four screws instead of two. This is what I did and it works great!
You also need to address the flapping air vent valves in the trunk of you car. They are located on the left and right side of the trunk right behind the cloth covering where the vent slits are cut. I used a piece of folded up cardboard to force them open so that when the woofers move in and out the rubber flapper valve doesn't make a slapping noise.
Last, look under the car where the spare tire well is and you will see some black box under it with tubes coming out. This is some portion of your fuel tank vapor control system. The tubing needs to be tie strapped a little tighter, and you could put some foam tape around the lines if necessary when your strap them better.
I also took my rear bumper cover off and put more foam tap along the 'rub-spots' on the black bumper that is underneath the cover so that if you have heavy bass it will cushion any vibration from the bumper cover.

Next, In my trunk lid I used a spray 'expanding' foam to squirt up into the holes of the bracing. It works awesome to make the trunk lid less resonant BUT you need to leave the trunk open about a day if you use a lot of it so that it can dry. Be sure to tape plastic sheet in the trunk wherever that stuff can drip out for a few days afterwards to catch any stray drips.
Also, add small squares of dynamat to open panels on both the trunk lid, spare tire well and the rear deck in the trunk.
Under the car you can tap any piece of flat metal with your fist and hear a change in the resonance. Louder means you might use a small couple inch squares of dynamat.
LAST: after all the dynomat pieces that you want to add are on the car, use a can of rubberized undercoating to spray all the open areas of metal like the spare tire well and even the floor panels.

There is more to do inside the car as well, but you asked about the trunk and stopping exterior vibration and noise.

If you take this same amount of effort as you go through the car installing stereo equipment, you will end up with a car that is dramatically more quiet on the road than your stock SVT contour. I did this and much more and it is a night and day difference when you finally go back and ride in someone elses contour.
My car right now is quieter than many new cars.

Oh yeah, look at my webpage and look at my stereo section. I have 4 tens in the trunk and it doesn't rattle.

By the way, don't go dynamat crazy! One $40 roll is sufficient for almost the whole car. It only takes about a 4"x4" piece to stop resonance in a panel probably 2 feet square!
Many people I know cover the whole square in dynamat.

By choosing small pieces and placing them in places where as you tap the panels they make more noise, you will keep the cost and the WEIGHT down in your car and still accomplish the same thing.
The rubberized undercoating on the bottom of the car in open panels also does wonders, sticks better, covers better and adds rustproofing while you are at it. That stuff is a win-win situation.

i have 2 12's in my tour with a 800 watt amp and it doesnt rattle. check for stuff in the spartire well and make sure other stuff isd secure. i also put lots of duct tape on the back of my tage and trimmed it with a box cutter.

Tage?