martynb Posted July 9, 2004 Share Posted July 9, 2004 I've searched but can't find too much on this subject. I'm not fussed about corrosion because it doesn't seem to happen but is there anyone who has had their supra undersealed and could comment on whether their is an appreciable reduction in road noise? I don't really want to sell mine and paid over the odds for a good one so I could keep it for a few years but the general level of noise is really wearing after a few hours. If I could find a way to make it more usable as a long distance car then I could keep it Quote Link to comment Share on other sites More sharing options...
JamesG Posted July 9, 2004 Share Posted July 9, 2004 Well, you could just get a Nurspec R. I doubt you'd hear any road noise with that on Seriously though, I think someone posted here recently about some stuff that you can apply to the insides of your panels to reduce road noise. It was like Dynamat but loads thicker and heavier. James. Quote Link to comment Share on other sites More sharing options...
SimonB Posted July 9, 2004 Share Posted July 9, 2004 What tyres have you got? They can make a big difference. Quote Link to comment Share on other sites More sharing options...
Terminator Posted July 9, 2004 Share Posted July 9, 2004 I have a JDM car on 18's and a Hyper exhaust. I have never found noise a problem, I actually like the noise my car makes. If the noise gets too much I turn up the stereo. IMHO if you added extra underseal it would reduce road noise to a degree. Quote Link to comment Share on other sites More sharing options...
carl0s Posted July 9, 2004 Share Posted July 9, 2004 posted by SKI here last month, and I couldn't agree more - the majority of the noise comes through the rear quarter: Tyre noise, thats a major problem in a supra, however you can cut it by about 50% with a few hours work. Here is how. Buy yourself a load of barriermat (not dynamat) try the heavyweight stuff from B J Auto Acoustics( that's the link above, it's yellow with a silver top). You will need to remove the contents of the boot, and the side panels, and the rear panels either side of the back seat. This is the area your getting most of the problem from. You need to apply a layer of this stuff right over the boot floor, shaping it as you go over the various bits. on the sides of the boot you can deaden the inside of the back part of the quarter panel. Also stuffing this rear part with foam afterwards is good also. As for the quarter panels either side of the rear seat, this you are best starting with about 3 layers of the barriermat over the wheel arches, then a single complete layer on the inside of the quarter panel skin. Now for the bit that makes the biggest difference. Sealing the quarter panel. Supra's come with two types of rear speaker one is simply mounted on a metal frame, and the other is in a black box, similar to the front door but bigger holding about a 6" speaker. If its the box type, its easier. anyway this is how you do both. Buy a product from your local motorfactors, called Autoflex by Autochem. it comes in a box of 4 large squares, so one box of them will do this job. They need to be heated to be flexable, so leave them in the hot press, until you are actually fitting them. (air temp must be at least 10c, so forget this job on a winters night). Measure and cut a mat to cover each side of the speaker bracket. On the part where the seat belt passes through leave the backing on where it might make contact with the seat belt. careful not to cover the panel mounting holes. Use a heat gun to almost melt the mat onto the edges. you can cut small pieces to cover any awkward area's. The idea is to get it airtight as possible. To make an even better job use the fibre stuffing from a pillow (white wool like stuff) to fill up the enclosure. This will help kill road noise and tighten the sound of your rear speakers up some. I have done all this and yes it works!. Also try putting some of the deadmat underneath the backseat. The finishing touch is another B J auto acoustics product They make a grey heavyweight matting for undercarpet. you need enough so you can put your boot carpet over it and cut around the shape. This is an excellent noise killer when you get a good fit. B J make some car specific kits but not for a MK4 supra only a MK3. Best to go your own way and do it right. I have SO2's 265/35/18's on the back and mine is fine except on the very worst road surfaces. Some famous noise generators are Pirelli P6000/7000/Zero. The only tyres I know which are pretty quiet are Bridgestone SO2 or 3 or Michelin Pilot sport. I can enjoy my music now, my car is almost is quiet as a 3 series. I have also done the doors, but this is an option. Hope you can hear yourself think soon ! Quote Link to comment Share on other sites More sharing options...
martynb Posted July 10, 2004 Author Share Posted July 10, 2004 Thanks very much!!! Couldn't get a much more comprehensive answer than that could I? :thumbs: :thumbs: I've got Eagles on it but I guess they could be in for a change as well. Thanks very much to all of you for your replies, that has given me some things to think about. Quote Link to comment Share on other sites More sharing options...
SimonB Posted July 10, 2004 Share Posted July 10, 2004 When I first bought the car it had Continental ContiSports on. When I switched to Eagle F1s I noticed they definiitely make more noise, but they are much better in the wet. Quote Link to comment Share on other sites More sharing options...
martynb Posted July 10, 2004 Author Share Posted July 10, 2004 Good gawd - the fronts are Eagles but the rears aren't. They are Champiro which I've never heard of but JIC put them on the wheels when I bought them so I guess they can't be too bad. Looked them up on the internet and there seem to be a lot of french and german references to them but not many uk ones. They've got similar tread patterns to the eagles and I had assumed the rears were the same as the fronts which I have had replaced - even the style of lettering is similar Either way I've never had any real problems with it in the wet or dry but I don't expect they have been built with quietness in mind. Quote Link to comment Share on other sites More sharing options...
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