Exhaust too loud, any suggestions? - Page 3 - FFCars.com : Factory Five Racing Discussion Forum
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post #61 of 154 (permalink) Old 04-12-2010, 02:54 AM
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Cobra Pack Mufflers

Rare Iron Eric, you have my attention.... What are Cobra Packs and what is the cost?

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post #62 of 154 (permalink) Old 04-12-2010, 09:09 AM
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Maybe I missed it but wind wings and visors have GREATLY reduced the wind buffetting for me. I also have lobaks and am very happy.


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post #63 of 154 (permalink) Old 04-18-2010, 10:51 PM
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Thankyou oldtop

I just tried oldtop's exaust mod and added cobrathegreat's steelwool idea and I can't be happier, the sound is deeper and alot quieter, and for under $40.00 it's perfect. I have noticed a little power loss, but I started with 630hp so I'll be ok. Thanks for the great ideas
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post #64 of 154 (permalink) Old 04-18-2010, 11:02 PM
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What is the steel wool part??

I'm not sure what the steel whhol part is please explain.
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post #65 of 154 (permalink) Old 04-19-2010, 12:40 AM
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I'm guessing he used steel wool instead of fiberglass in Oldtops mod.

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post #66 of 154 (permalink) Old 04-19-2010, 01:39 AM
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I did use the fiberglass insulation, but I also cut a piece of the gutter guard into a circle and stuffed it into the sink basket, then another circle into the pipe up against the back of the fiberglass and sandwiched a stainless steel pot scrubber in between the two. The pot scrubber is loosely woven unlike a steelwool pad which would be way to much restriction.

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post #67 of 154 (permalink) Old 04-19-2010, 04:12 AM
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Rare Iron Eric, you have my attention.... What are Cobra Packs and what is the cost?
Cobra Packs are straight through exhaust inserts made by Classic Chambered: http://www.classicchambered.com/clas...cts.html#cobra.
You have to cut your pipes and then weld in the new mufflers. The pros of this option are: various lengths, you can make your pipes go all the way back to the rear fender now and give it a better look IMO. You can also choose to have the glasspack inserts or not. With glasspacks, I've heard they are similar to Quiet Pipes is dbs. Another pro is that these are designed correctly for exhaust flow. You're engine will perform the best with these pipes. I've seen pictures of the inside of the FFR pipes and at least in those pictures the mufflers were backwards.
The cons of this option are that you have to cut your pipes and weld in the Cobra Packs (including exhaust hangers). Then you have to clean the pipes up and ceramic coat them if you want.

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post #68 of 154 (permalink) Old 04-19-2010, 04:31 AM
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One thing you might consider is getting a set of motorcycle type headsets with microphones. This way you'll save your ears and still have a converation.

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post #69 of 154 (permalink) Old 04-21-2010, 09:31 PM
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Zoomie Insert Update

Quote:
Originally Posted by SJDave View Post
Has anyone tried these inserts inside the Long tube Headers before the side pipes?

Seems like an easy install without cutting those expensive SS pipes.

$199 for a set of 8 inserts.
Car Chemistry does not make the Zoomie inserts to fit 1.5" ID pipes like the BBK's that came with my 3.1 complete kit. I talked to them yesterday and they believe it is possible to do and still achieve 10db sound reduction and minimal HP loss. So I ordered a set of 8 for $199 that will fit the BBK pipes. They will use a 1.2" core with high temp fiberglass packing around them.

I'll post some pictures of them when I get them installed and sound level results before and after.

Dave

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post #70 of 154 (permalink) Old 04-21-2010, 10:37 PM
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I didnt think it was possible to be too loud...lol..Then again I may be half deaf from 26 years of Drumming and Driving open header cars...

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post #71 of 154 (permalink) Old 04-22-2010, 08:14 PM
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too loud

unheard off solution Buick Lucerne:

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post #72 of 154 (permalink) Old 04-22-2010, 08:32 PM
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Nice solutions....
I'm one that thinks these cars can't be too loud

Maybe it's time for a Miata

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post #73 of 154 (permalink) Old 04-25-2010, 01:17 AM
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You guys who like loud cars would like my pipes then. I really liked the sound at first but then it just sort of got old and isn't a pleasure to drive for more than 5min without earplugs. Now, what DO you guys consider too loud???
This thing runs at around 90db at idle. It's not really the volume that gets to ya, it's the pop they have. The closest thing I can compare it to is a stock car. Watch the vid from my signature and imagine 90+db as you drive. I just want to knock it down just a touch and Oldtop's solution works (still louder than stock FFR exhaust). But, I keep having problems keeping fiberglass packing in the pipe. I tried a one piece section of the gutter guard and by the end of the day it has sucked the guard half way INTO the pipe. The next time I started the car it looked like I sucked a rabbit into the engine (gray fiberglass everywhere). There went the packing. So, I'll try one more time to get this to work then start considering new pipes. Maybe I can find someone local who has an extra set of pipes to borrow so I can hear what normal pipes sound like.

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post #74 of 154 (permalink) Old 04-25-2010, 04:43 AM
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Thumbs up Super S pipes

These intrigue me. I think adding a crossover pipe would be a further improvement.

https://www.ffcars.com/forums/showthr...ighlight=pipes


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post #75 of 154 (permalink) Old 04-25-2010, 11:12 AM
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Quote:
Originally Posted by hotrodedell View Post
I didnt think it was possible to be too loud...lol..Then again I may be half deaf from 26 years of Drumming and Driving open header cars...
Ha: right there with you except only been drumming 12 years.

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post #76 of 154 (permalink) Old 04-25-2010, 11:54 AM
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I found DIY custom plugs for under $15 online and they work GREAT!!!

For anyone interested, it is a two part "silicone epoxy like" approach, just like Epoxy Putty - you knead the two parts together, stick them into your ears, wait 30 mins then take out perfectly custom ear plugs.

My ear canals are too small for the "Normal orange plugs" to fit well (they are a bugger to get in, are painful - wish they came in different sizes!), so these are well worth the $15!!!!

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post #77 of 154 (permalink) Old 04-25-2010, 12:22 PM
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I used (borrowed) the two flange cc inserts in the FFR pipes and simply drilled one hole through the inside of the rear pipe(under the car) just behind the rear weld. I was then able to slide the insert in from the opening, line up the hole in the insert flange with the hole I drilled. One sheet metal screw, inserts are in. Much quieter. Passed inspection. I now run Gas N pipes. Deeper, more mellow sound. Not the jack hammer effect of the originals without the inserts. Overall, the best sound abatement we found was the two stage CC inserts but I really like the look of the Gas N pipes now.

HTH.

-Steve

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post #78 of 154 (permalink) Old 04-25-2010, 12:26 PM
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I have a brand new set of the Car Chemistry 3 disk with coated turn out still in the box. When I bought a set of custom new/used pipes from a crazy freind of a freind I knew it would be louder, but freaked when I first started it up. Since then I have grown love that sound and even my wife says it sounds great. my neighbors aren't so sure, bit I am legend. Are your turnouts angled down 45 degrees? That makes a huge difference. And BTW the CC stuff is forsale, best offer...

The whole is more than the sum of the parts, and twice as loud
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post #79 of 154 (permalink) Old 04-25-2010, 12:48 PM
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Try these they work great I usually ware one stops wind noise as well.

http://www.gamaliel.com/cart/product.php?productid=6482

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post #80 of 154 (permalink) Old 04-25-2010, 02:39 PM
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My original Lone Star side pipes were loud. My motor was a 380 hp 302. At 4000 rpms it sound like a Nascar motor. You could hear me 1 1/2 miles away. Got pulled over by a cop who heard me at 6000 rpms. He was three blocks away. NO ticket. And I do have a pictures to prove it!

Two years ago I stroked the motor to 354 ci and replaced my 24" side pipes, which had a 2 1/2" core with Classic Chambered Cobra 28" pipes with 3" core. Much quieter. Low deep rumble. Very quiet at 60 - 70 miles per hour. Great below 4000 rpms.

If you increase the inside volume of your side pipes they will quiet the exhaust sound.

http://www.classicchambered.com/

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post #81 of 154 (permalink) Old 04-26-2010, 06:55 PM
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That kind of sounds like mine. I've been heard over 3mi away under full throttle. After looking at the CC website, I'm wondering if my mufflers are without packing. I didn't know that was an option but it would explain the loud raw sound. Does anyone know of a way to tell if I have packing without drilling a hole in the muffler body? I'm starting to lean toward new pipes since I can't seem to keep Oldtop's mod intact, sorry Oldtop. I'll give it one more shot though.

Quote:
Originally Posted by DWIGHT View Post
My original Lone Star side pipes were loud. My motor was a 380 hp 302. At 4000 rpms it sound like a Nascar motor. You could hear me 1 1/2 miles away. Got pulled over by a cop who heard me at 6000 rpms. He was three blocks away. NO ticket. And I do have a pictures to prove it!

Two years ago I stroked the motor to 354 ci and replaced my 24" side pipes, which had a 2 1/2" core with Classic Chambered Cobra 28" pipes with 3" core. Much quieter. Low deep rumble. Very quiet at 60 - 70 miles per hour. Great below 4000 rpms.

If you increase the inside volume of your side pipes they will quiet the exhaust sound.

http://www.classicchambered.com/

Dwight

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post #82 of 154 (permalink) Old 04-26-2010, 07:22 PM
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I know I'm late to this party, but having lived in my car for 25,000 miles, often doing several hundred miles in a day, I'd like to add this:

Never forget that we are trying to civilize a wild beast, kind of like pretending that a wolf can be a pet, which is wishful thinking. I have a small 4.6L engine, regular manifolds going into catalytic converters, and FFR sidepipes. Turns about 2,500 on the freeway and is still too loud. Buffetting behind big trucks pounds on the ears.
I always wear earplugs; generally corded ones so I can carry them around my neck when I'm out of the car. The have a little stem for easy insertion. To me it's cheaper and easier than rebuilding the exhaust system.

The original dash-mount mirror is worthless, especially on multilane interstates. I added an 8-inch-wide panoramic mirror and breathe much easier now.


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post #83 of 154 (permalink) Old 05-14-2010, 03:49 AM
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Preliminary Sound Level Results - CC Zoomie inserts

[QUOTE=SJDave;2224298]Car Chemistry does not make the Zoomie inserts to fit 1.5" ID pipes like the BBK's that came with my 3.1 complete kit. I talked to them yesterday and they believe it is possible to do and still achieve 10db sound reduction and minimal HP loss. So I ordered a set of 8 for $199 that will fit the BBK pipes. They will use a 1.2" core with high temp fiberglass packing around them.

I'll post some pictures of them when I get them installed and sound level results before and after.

-------------------------------------------------------------------------

Installed the inserts this weeks, took about 1 hour to clear out the excess weld material in the BBK pipes so the inserts will slip in. Used a round bastard file and "flap" sander roll in the die grinder.


Mine were a really tight fit so I took alot of measurements and CC will reduce the OD a bit for the next person. I am pretty happy with the initial results, I used a meter held at head level in the driver position...my car is still go-cart stage.

Zoomie Insert 1.5" OD:


Fiberglass wrapping removed:


A look inside:


900 RPM IDLE:

Before - 92 dbA
With Zoomie inserts - 82 dbA

3000 RPM no load:

Before - 103 dbA
After - 95 dbA


For $200 I think it is pretty good gain on sound reduction, I'll see what it does to performance once I get the car licensed and on the road.

Dave

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post #84 of 154 (permalink) Old 05-14-2010, 01:02 PM
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Sound Quality?

I am considering doing the same thing with my 4X4s, SJDave. You note the dB reduction. How would you evaluate the change in quality of the exhaust note with the Zoomie baffles? To me the high-pitched "bark" with the stock pipes is worse than the dB level - although dB reduction is also needed.

Thanks in advance. FET

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post #85 of 154 (permalink) Old 05-14-2010, 02:11 PM
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Don't rule out the foam throw away type earplugs. They have one of the highest noise reduction ratings (NRR). Most have an NRR rating of 33. That means when properly inserted (yes this is a proper way to insert them, most don't do it and it affects the rating) they will reduce the noise level by 33db. About the only thing more effective are the molded ones. They cost about a $100 and any place that sells hearing aid can make them up for you. You need to be sure to keep them clean to avoid ear infections. That another advantage of the throw aways. There cheap enough to use them once then throw them away. You can buy them in bulk packs from Grainger or any industrial supply house. Us can get a carton of 100 pairs for about $25-$30. I use them on the motorcycle under my helmet (wind noise on a mc can be >95db), for shooting and will use them in the cobra. And yes you can still hear whats going on around you...it's just muffeled.
Correct me if I'm wrong, the proper way to inset them is to roll them up tightly and insert in ear and let them expand to fill ear canal? I like the loudness of mine. It serves as a warning to dumb-assess on the road. I like to drop down a gear and gun it when I'm next to someone playing crap music or yakking on cell or texting. I'll tell you it get's their attention quickly.

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post #86 of 154 (permalink) Old 05-14-2010, 02:23 PM
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Quote:
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Correct me if I'm wrong, the proper way to inset them is to roll them up tightly and insert in ear and let them expand to fill ear canal?
Roll them tight as you can and stick 'em im. Over the years I have found that wetting them a bit with some saliva makes it easier to slip them in. Make all the jokes you want--it works. Corded, baffled plugs usually have a rigid center with a piece that allows you to guide the plug in and out as needed. I really like those because you can carry them under you shirt when you are out of the car.
That said, there are some types of plugs that i like and some I can't stand. You just have to find what works for you.


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post #87 of 154 (permalink) Old 05-14-2010, 02:49 PM
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I was afraid to make this post, as it opened me up to a deluge of sissy boy attacks......but man they are funny! Made me LOL!

I agree, I like the noise and the earplugs are the way to go.....so why do this:

1) The biggest reason I am trying to get the sound down is to keep some peace in the home...mainly when I am tinkering with the car. It makes the dishes rattle in the cabinets so I am now only starting and tuning when she leaves the house....yes I have been a bad dog for a long time and there is not much more Sh*%&t she will tolerate. Now that I think about it, I should probably just attach hoses to the sidepipes, run them into a 30 gallon trash can outside converted to a giant muffler. Hey, I can mount that on the trunk for Autocross days...Sweeeeeeet! Duct Tape it. Improved Braking , i love it.

2) The local Autocross run at Great America has a sound limit of 96 db, these inserts probably aren't going to get me there, so I will need some caps to put in the sidepipe ends also....or the trash can muffler.

3) I'm 60 years old....everyone tells me I have to start acting like it.

QUALITY OF THE SOUND - Much less Bark, more mellow...

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post #88 of 154 (permalink) Old 05-14-2010, 04:17 PM
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For some quantitative sound levels, here is a post I did some time ago.

It is long winded, but I think has some relevant info on different pipes, etc, along with some solid test data on two sets of pipes...

https://www.ffcars.com/forums/showthread.php?t=182840

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post #89 of 154 (permalink) Old 05-14-2010, 05:39 PM
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When I bought my car it had baffles in it.....they made this annoying chirp and tweet sound all the time. I pulled them out and to be honest the car is about the same in terms of levels but sounds much nicer........I hate to admit it, but I'm 43 years old and I still chant the montra "If it's to loud you're too old"


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post #90 of 154 (permalink) Old 05-14-2010, 05:48 PM
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I don't know, I'm younger than U and like my undercar exhaust, definetely quieter... )

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