pipes "too loud" on my '68 461 stroker firebird say the comunists, suggestions? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 06-05-2012, 05:33 AM
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pipes "too loud" on my '68 461 stroker firebird say the comunists, suggestions?

I drive my '68 firebird every day, sometimes 150 miles a day and have a 461 stroker in it. For two days in a row the comunist at the Gate of the military instalation that i work at has been telling me "you need your muffler fixed" and "you need a muffler" ..... insulting to the core because the dumb **** prob doesn't realize its a V8 and most average V8 american cars have dual pips, Plural. the Military Police don't ever harass me and I have no moving violations of any kind anywhere because I keep burnouts and other funness at the track. I currently have dual thrush glass packs under the car that exit before the rear tires, and unfortunately i idle now at the resonant freq of my pipes, so even though the police and eveyone don't ever harass me (quieter than most flowmsters) the deep bass shakes the damn overhang when they check my ID card.

i have 2.5" pipes with a crossover now and was wanting to get 3" in the near future, whats a good 3" muffler with maybe a flapper built in or something thats loud and flows a lot but i can kick in to be left alone. When a SGT in the army can't show up at work its bad ju ju for him.

suggestions? again the curren't setup isn't actually as loud as some of the lifted trucks around here, just shakes everything around it...
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Old 06-05-2012, 06:25 AM
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Noise bag.

Hi. The 347 stroker i have is a noise bag as well with 2.5 inch dual pipes and and "x" pipe connector , followed byflowmasters as it came from California. As my car had to have a full inspection after a full restore i was wondering how to quiet it down. What i came up with was two 2 inch harley baffles from the local harley dealer wrapped in stainless wool and pushed up the rear end. I locked them in place with two aluminium rings turned up on a lathe so if you were looking at it from behind you see two thick al rings. It took the rumble/crackle out of the thing and passed inspection. The baffles were about 8inches long and 18 bucks.
Cheers
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Old 06-05-2012, 07:14 AM
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i HAVE no crackle... thats what erks me. standing 200 feet away somebody with flowmasters pulls away and then i pull away mine is much quieter. It just shakes everything around it with the bass...

i made spin type inserts for my pipes and used them last summer, but if the screw fails while the 7.5L v8 is going full tilt passing somebody I'm afraid the backpressure will send the insert flying at unholy speeds at somebodies car or worse a pedestrian...

really set on flappers i can control but have no clue who makes any besides dynomax mufflers that are $100 a piece
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Old 06-05-2012, 07:48 AM
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what about adding a pair of bullets at the end of your pipes to act as a resonator? You could test it with a pair of cheap glasspack short mufflers.

Also, do you have turnouts?
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Old 06-05-2012, 08:21 AM
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the glasspacks run down the floor pans with an H pipe before them, then both turn outwards right before my traction bars and then take another 45 degree angle facing backwards blowing straight at my rear tires...

i'd love to find something like a throttle to put in each tip.
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Old 06-05-2012, 12:47 PM
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Former AF Ssgt here, and I dig your car and the way it looks, I drove a 70 GTO that was in similar condition daily, and it was loud too. 455s are like that. The big thing with the people who complain on post/base or at the gate isnt really how loud it is. They see you car as a POS because it isnt shiny and all one color. They are very superficial and will nitpick anything to give you a hard time. Make it shiny and get rid of the rust, and they wont complain nearly as much. I was harassed constantly by the base housing guy over my GTO when it was flat black. I rattle can painted it gold, then a while later two tone blue, then yellow because the paint doesnt look good for long. After that he stopped being a jerk and the cops at the gate were much more pleasant. I ended up painting both of them later with real paint, the bird cost $300 and the GTO was $550. Its not too bad if you have a place to do the work, and the tools to do it.

I know that might not be what you want to do with it, so here is how I was able to drive my loud *** Pontiacs on base. Summit has some inexpensive turbo mufflers, they are around $20, and they sound quite good. My 79 Formula ran 12.0-11.80s with them, and the GTO ran the same mid 13 times with the pipes under it or not. Both had 455s with headers and nothing more than a pair of 4' lengths of 3" pipe with one of those summit mufflers on the end of each one. Some tail pipes will move the sound out the back instead of bouncing it off the ground so it resonates under the car if you dont have any. You dont want it to come out the sides ahead of the rear wheels, you want it out the back of the car.

I got compliments on the GTO all the time, especially at idle, and it was more than loud enough when I stomped the gas. This is what was under it, but without tailpipes. The tail pipes made a huge difference.

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Old 06-05-2012, 01:08 PM
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Old 06-05-2012, 05:02 PM
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Old 06-05-2012, 05:15 PM
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yeah, the rattle can job with an ace of spades/two of hearts gets a lot of thumbs up, had it since i was a private. replacing both quarters and door skins so real paint is a ways away. found a flowmaster 3" full system without mufflers for 250 i might snag in a week, then some cheapo thrush mufflers. will save the 2.5" side exit glasspacks for a another project. the bends should quiet things down going over the axle...
for now i stuffed the spiral inserts in. fiberglass is long burnt so no real affect...
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Old 06-05-2012, 06:11 PM
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Getting the exhaust out from under the car will help a bunch. I like the sound of the Thrush welded mufflers good bang for the buck! I had an 80 chevy with a cammed up 355 glass packs and a gear drive. I'd get all kind of responses like that thing got a blower? Or what's wrong with your truck? I even had a SSgt (Marine Corps) that tell me it was my power steering! It didn't have power steering. The general population just don't get it!
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Old 06-05-2012, 06:49 PM
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Quote:
Originally Posted by 6426yy
Getting the exhaust out from under the car will help a bunch. I like the sound of the Thrush welded mufflers good bang for the buck! I had an 80 chevy with a cammed up 355 glass packs and a gear drive. I'd get all kind of responses like that thing got a blower? Or what's wrong with your truck? I even had a SSgt (Marine Corps) that tell me it was my power steering! It didn't have power steering. The general population just don't get it!
I second the Thrush welds. I have them on my '82 'Burb they sound great, especially for the price. My old Poncho 406 shook the ground even with turbo's on it, they just aren't meant to be "gentle and quiet", one of the greatest wide open sounding motors ever made in my opinion. Good luck.
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Old 06-05-2012, 07:53 PM
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Move the outlets to the back of the car... that may fix it.
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Old 06-05-2012, 10:23 PM
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Quote:
Originally Posted by Mojo56
Move the outlets to the back of the car... that may fix it.
x2

I had a 351C in a 68 Torino and TURBO mufflers (not glasspacks) with turndowns just ahead of the rear axle.

The resonance, stationary and at idle, was AWFUL. My wife (then fiance) used to complain that it would shake her hair combs right out. Honest to God, it made your voice sound like you were thumping your fist on your chest!

But 2-1/2" pipes to the back bumper, THEN turned-down at a 45 to the pavement was sweeeet.

It had a throaty sound with just a hint of crackle around 3500 RPM or so ... about the same time that Cleveland was catching its breath and making good torque.

God, I miss that car.
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