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Re: Want to quiet down the RR
[Re: dstryr]
#1485682
08/19/13 03:06 PM
08/19/13 03:06 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
What's the opinion on the exhaust pulses destroying the dynomax superturbos and then having them rattling?
Here are a couple of links as it is now:
http://www.youtube.com/watch?v=uT4SfLSn1Sw
http://www.youtube.com/watch?v=sAjclM4TEBw
There is a chance of breaking spot welds on any muff
but Dynomax are a good muff.. we did a study on a few
muffs we were looking at for production but the Germans
got their way so we didnt use the Dynomax(but we were
looking at a custom built one for production to meet
our specs)
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Re: Want to quiet down the RR
[Re: MR_P_BODY]
#1485683
08/19/13 04:27 PM
08/19/13 04:27 PM
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Joined: Aug 2004
Posts: 214
Hamburg / Germany
Den300
enthusiast
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enthusiast
Joined: Aug 2004
Posts: 214
Hamburg / Germany
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thats how it sounds inside with all windows closed. on the video it sounds nice, but if you drive it for more than 10min it is annoying. web page if the weather is fine I can send the magna vs turbos comparison this weekend
Hamburg/Germany
69 Chrysler 300
446cui Dual Quad
12.64 @ 110.7
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Re: Want to quiet down the RR
[Re: Paul_Fancsali]
#1485685
08/19/13 05:37 PM
08/19/13 05:37 PM
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Joined: Jan 2003
Posts: 9,881
Weddington, N.C.
Streetwize
master
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master
Joined: Jan 2003
Posts: 9,881
Weddington, N.C.
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I run the Dynomax Hemi Turbo's 17769. Like I said On my motor I think ultraflows would be a it too many Db's even though I like the tone. DB's are proportional to compresion and overlap so without the benefit of the reverse flows I would be rattling my neighbor's molars out of his head.  My  on backpressure and reverse flows being too restrictive and "costing power"....well if that were the case I would expect to see the muffler cases getting hot spots and swelling if the backpressure were too severe to flow. I think if there's real measurable backpressure restricting flow that pressure would (logically) be pushing against the muffler case as it is much thinner than the rest of the exhaust system. Also the longer down pipes (especially a B body) and the cases themselves absorb and dissipate a lot of heat before they ever get to the mufflers.
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Re: Want to quiet down the RR
[Re: Streetwize]
#1485687
08/19/13 06:07 PM
08/19/13 06:07 PM
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Joined: Nov 2003
Posts: 5,160
Texas
dannysbee
master
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master
Joined: Nov 2003
Posts: 5,160
Texas
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I am a big fan of 2.5 mandrel bent tail pipes with turn downs. My guess is you would see very little flow loss in a system with 3". Head pipes and tailpipes and one with 3" heads and 2.5 tail pipes. The tips just act like a megaphone. That is why I like the turn downs.
Getting old just means you were smarter than some and luckier than others.
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Re: Want to quiet down the RR
[Re: Quicksilver440]
#1485688
08/19/13 06:31 PM
08/19/13 06:31 PM
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Joined: Sep 2003
Posts: 2,966
Wendy, I'm home.
dstryr
OP
master
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OP
master
Joined: Sep 2003
Posts: 2,966
Wendy, I'm home.
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Quote:
Here's a pic of some great resonators...it'll quiet that car right down too:
Not the stock look I have been imagining...
Ok, talked to the shop, they had the 17744's brought in, asked if they would do the 17769's which were the muffs I had originally supplied. If they call back and say Yes, it goes in next week. If No, I do it myself or find a shop that will fix me up.
Thanks all ; I will follow up with a report and a couple clips when I get this straightened out.
FS
dstryr, since 1986.
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Re: Want to quiet down the RR
[Re: dstryr]
#1485693
08/20/13 10:40 AM
08/20/13 10:40 AM
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Joined: Jan 2003
Posts: 13,380
Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,380
Marion, South Carolina [><]
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Hooker Aerochambers are what you need. Although I'm surprised what you have is too loud for you.  The Aerochambers will be quieter, but still flow very well. The Dynomax super turbos sound good and are quiet, but they don't flow well at all. You'll be able to tell you lost power as soon as you pull out onto the highway from the exhaust shop if you put them on your car. Just went through this same scenario w/ my dad's 475 hp 440-6 road runner. Started out w/ Dynomax ultraflows, but they were too loud for him (sounded great to me). Put on some super turbos...he loved the sound (quieter), but hated the loss of power. Put on some Hooker Aerochambers...now all is right w/ the world. 
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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Re: Want to quiet down the RR
[Re: an8sec70cuda]
#1485694
08/20/13 11:05 AM
08/20/13 11:05 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Hooker Aerochambers are what you need. Although I'm surprised what you have is too loud for you. The Aerochambers will be quieter, but still flow very well.
The Dynomax super turbos sound good and are quiet, but they don't flow well at all. You'll be able to tell you lost power as soon as you pull out onto the highway from the exhaust shop if you put them on your car.
Just went through this same scenario w/ my dad's 475 hp 440-6 road runner. Started out w/ Dynomax ultraflows, but they were too loud for him (sounded great to me). Put on some super turbos...he loved the sound (quieter), but hated the loss of power. Put on some Hooker Aerochambers...now all is right w/ the world.
Thats why I like to mount them back at the bumper...
with the exhaust being cooler back there its reduced
in volume/area and isnt near the loss.. but if the car
is predominantly a street car they are great... I
dont like to get into the muff posts because its all
a personal preference thing... sound quality,hp loss
and drone
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Re: Want to quiet down the RR
[Re: dstryr]
#1485696
08/30/13 08:05 PM
08/30/13 08:05 PM
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Joined: Sep 2003
Posts: 2,966
Wendy, I'm home.
dstryr
OP
master
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OP
master
Joined: Sep 2003
Posts: 2,966
Wendy, I'm home.
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Quote:
Quote:
I run the Dynomax Hemi Turbo's 17769.
ah, the truck muffler... looks like I'll be getting truck mufflers, too, just don't know yet who will be putting them on. 
Dropped off the RR this am and had it back by 2:30. First start it sounded pretty similar to the magnaflows but it was clear as soon as I hit the street that the 17769s were the right choice. Quiet enough to have a conversation, hear the other cars on the street, and still sound pretty dam good!
On the drive home tonight I heard a little drone @ around 40-45mph getting up to speed on the I80 on-ramp but by 50mph it was gone and the exhaust note was very mild at cruising speed. Plenty louder when I laid into it.
Couldn't be happier. The receipt did say no warranty though, the guy thinks the engine is going to blow these things apart.  
dstryr, since 1986.
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Re: Want to quiet down the RR
[Re: dstryr]
#1485697
08/30/13 08:16 PM
08/30/13 08:16 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Quote:
Quote:
I run the Dynomax Hemi Turbo's 17769.
ah, the truck muffler... looks like I'll be getting truck mufflers, too, just don't know yet who will be putting them on.
Dropped off the RR this am and had it back by 2:30. First start it sounded pretty similar to the magnaflows but it was clear as soon as I hit the street that the 17769s were the right choice. Quiet enough to have a conversation, hear the other cars on the street, and still sound pretty dam good!
On the drive home tonight I heard a little drone @ around 40-45mph getting up to speed on the I80 on-ramp but by 50mph it was gone and the exhaust note was very mild at cruising speed. Plenty louder when I laid into it.
Couldn't be happier. The receipt did say no warranty though, the guy thinks the engine is going to blow these things apart.
Glad your happy with them... I have no idea why he
thinks they will be blown apart... for being a exhaust
guy he doesnt know that much.. if you knew the frequency
of the drone you can change that(or just drive through
it quicker)... are you running tail pipes with them..
on the drone is it at a rpm that you can live with
(cruise speeds)
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Re: Want to quiet down the RR
[Re: MR_P_BODY]
#1485698
08/30/13 08:42 PM
08/30/13 08:42 PM
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Joined: Sep 2003
Posts: 2,966
Wendy, I'm home.
dstryr
OP
master
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OP
master
Joined: Sep 2003
Posts: 2,966
Wendy, I'm home.
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Yes on tailpipes, 2" Doug's D452s, 3" pipes with an 'H', then 3" tailpipes. The tips are 3" factory style tips. Really, the drone was very mild and only in a short range and you're right, I can drive through it though I don't think it'll ever bother. As for the blowing apart, this guy is probably one of the 2 top guys in Des Moines, IA and he does beautiful work. Maybe he's had a bad experience with turbo mufflers on big motors, but I'm super happy with his work and I'll go back, can't wait to get my old GTO over to him. And thanks to all for the replies, I had some doubt on the turbos but I know I made the right choice.
dstryr, since 1986.
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Re: Want to quiet down the RR
[Re: dstryr]
#1485699
09/17/13 01:38 PM
09/17/13 01:38 PM
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Joined: Aug 2004
Posts: 214
Hamburg / Germany
Den300
enthusiast
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enthusiast
Joined: Aug 2004
Posts: 214
Hamburg / Germany
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Took me a little bit longer to take the videos as I was on vacation meanwhile. Do not get irritated by the sound volume. The decibel-measure-thing says it all. The quieter Turbos are also way bigger. The sound itself is totally different and at the moment I do not like it but lets wait some miles. Maybe it will change. it is definitely more fun to drive now but one new problem occurs. The A/F ratio was always 14.5-15.5 at idle and after the swap it is 19.5-21. What could have caused this? I changed nothing but the mufflers and I would guess the straight through Magnas would outflow the Turbos? If not and the Turbos flow mch more, then it would sense. Oh, and the quality of the Magnas is so much better!    Around the car with Magnaflows Around the car with TurbosDennis
Hamburg/Germany
69 Chrysler 300
446cui Dual Quad
12.64 @ 110.7
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