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Looking to quiet interior noise

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Hello. I have a 1974 2002 that I want to make quieter. Right now, at 70mph the car is pleasant to ride in but anywhere above 70 it becomes very hard to listen to music or chat with the passenger.

I already replaced the dampener with B-quiet brown bead. Weatherstripping is next.

The car has what I am told to be a stock exhaust manifold with 2.25 or 2.5 inch piping to a dynomax muffler and ANSA tip. Is there a QUIETER MUFFLER OPTION that will still flow well?? The engine has modifications including 38/38 and higher compression pistons. I don't know if I have a resonator (or what a resonator is). Would it help? THANK YOU!

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The addition of soundproofing under the carpet made a HUGE difference. Also the addition of a 5-speed helped a bunch too. Other than that there's things like soundproofing under the rear seat & rear firewall, front firewall, roof (under headliner) and replacing your weatherstripping and gaskets. You're in an old car and the M10 is a loud motor. Also ditch out on that 2.25 or 2.5" exhaust and get something stock. OR whatever you do don't run anything Ansa because it's loud as hell! Also some tires are louder than others.... belt driven engine fan makes noise - negligable at speeds above 50....

Hope that helps... exhaust quieter and more soundproofing... or go buy yourself a new toyota

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you could also try spraying new undercoating in all the wheel wells

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1. 5 speed

2. new door weatherstripping

3. good heavyweight broadloom carpet padding (like from your house) under the carpets and up the firewall on the inside

4. Pack flexible foam (or even styrofoam peanuts in bags) under the back seat cushion

5. Talk louder, turn up the radio

Accept the fact that '02s are never gonna be as quiet as a new car...but who cares?

mike

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What is a resonator? There is a low humming noise at freeway speeds that is cause for most of the noise inconvinience on the inside. I have a dynomax muffler of some sort with the asna dual tip and I would like to try and eliminate that noise. If anyone is selling something quieter I would be interested! The car has a pipe of 2 or 2.5 inches to the muffler, nothing in between the muffler and the exhaust manifold. Would a Resonator help?

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What is a resonator? There is a low humming noise at freeway speeds that is cause for most of the noise inconvinience on the inside. I have a dynomax muffler of some sort with the asna dual tip and I would like to try and eliminate that noise. If anyone is selling something quieter I would be interested!

I care about the noise because my lady friend and I will be using the car to go on long camping trips and we like to chat and listen to music (clearly) while driving. I already have the 5speed.

I would like to also try weather stripping for both doors. Is there anywhere to get a better price than 300 for both doors.

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Before you go down the road of de-tuning your car think about a few things first. Someone, I'm assuming the PO and not you, put 2.5" pipes on your car and a dynomax muffler on. What's your engine setup? The single most restrictive point in the exhaust system is the rear muffler (stock). A stock muffler can be had for ~$80 maybe cheaper if you find a good used one. I still caution though. You say: "The engine has modifications including 38/38 and higher compression pistons" well you're going to negate much of that if you de-tune down to stock exhaust.

2002's are not quiet cars. M10's are also not quiet motors. Our motors are loud, rev high and make a bit of valve noise. Things you can do are keep everything in tune, adjust your valves, take out any urethane and put in rubber bushings and soundproof your car. If you have a 38/38 with high comp pistons you're probably up around 120hp at the flywheel and possibly more depending on a few things... You're going to quiet down your car which will be nice - it'll probably sound like a Prius... and it'll drive like that too.

Again, these are not quiet cars but start with a 5-speed and soundproofing before you "DE-TUNE" your car. There are a bunch of threads on soundproofing with cheap material reccomendations, etc. Stay away from undercoating but tear up the carpet and put down a few layers on the floor. Don't forget the firewalls - BOTH front and rear, and under the rear seat. That will help a TON.

Take 20hp off your motor by going to a and with that 38/38 next thing we'll be hearing out of you is how come I'm only getting 12mpg and what happened to my car... it used to be fun... "1974 BMW 2002 FOR SALE"

Keep it real!!! I don't even have a radio and it's great!!! Even on long rides there's nothing better than listening to the car or enjoying the trip with whoever I'm driving with.

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You are probably right about going to a different muffler. the PO who setup this car did a great job in making it perform well so I won't ruin that and thank you for pointing that out. I already have the 5 speed and just layered the car with B-QUIET dampener.

Would a resonator be any more restrictive? and would it even quiet down the low humming noise? If not then i'll just forget exhaust modifying and concentrate on sound proofing and weather stripping.

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The SCORPION is my favorite muffler for an 02. Considerably quieter than the ansa (and deeper and more badass IMO). It is from England, where there are stricter noise ordinances. Def one of the best ways to spend $300 i can think of. 

 

I'm also looking forward to not skimping on the soundproofing under the carpet. Should be huge. 

 

Darien

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...and the final touch is Cocomats.  They are thick and heavily backed which definitely helps reduce engine and road noise.

 

Disclaimer: I am in no way affiliated with Cocomats or their ownership (Drew).  Just a happy customer.

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