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juan ruiz's Avatar
 
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Muffler Choices

What is the Muffler of choice for the 930/911 and why that particular brand? I'm looking at something light weight and small that will not wake my neighbors up
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10.76@139-1/4 mile
0-1 mile 193MPH
Old 05-11-2010, 07:44 AM
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I thought you had a special build muffler?

Brian here makes 930 mufflers. He might be able to make somthing that is not as loud if you check with him.

Monty stands out in my mind.

I suspect the stock euro / non cat muffler is not as bad as most might think. One could add a second tail pipe out the other side and cap it for street runing.

You might be able to add a secondary muffler in your the left rear fender and loope your's throught it. Then you could remove it and reinstall you pressent tail pipe for having fun. Just a thought.
Old 05-11-2010, 08:11 AM
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Having just removed my stock euro system I can assure you that light it is not. My guess is that the muffler itself is at least 30 lbs - I'll weigh it for fun when I get home and post the result. Not sure of the actual weight of Brians, but its a small fraction of the stock muffler.
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Richard
1982 930, K27-7200, Ruf wheels, Leask WUR, Tial WG, WEGO IV AFR, RarlyL8 headers & single out muffler, TK I/C
2011 R350 winter beater
2004 BMW R1100S
Old 05-11-2010, 08:19 AM
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Crotchety Old Bastard
 
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Juan you know I'm a phone call away -
Let me knoiw what you need and I probably have a solution.

The stock 930 cat/muffler weighs 42 pounds; my muffler weighs 12 pounds.

The stock cat/muffler will cost you 12HP, throttle response and cool sounds vs mine.

My muffler spools a K27HF about 1000rpm sooner than a Monty.

You can check out stock fitment applications, both single and dual out, here at Pelican.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8

Last edited by RarlyL8; 05-11-2010 at 09:08 AM.. Reason: typo
Old 05-11-2010, 09:05 AM
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I'm running this: SM-350-625-17**




in place of this shorter/smaller OD that I originally made:




It's not super quiet, but it's much better than a Zork.
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Old 05-11-2010, 09:57 AM
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My euro muffler weighs in at 30lb. The heat exchangers, pipes and wastegate are 50lbs.
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1982 930, K27-7200, Ruf wheels, Leask WUR, Tial WG, WEGO IV AFR, RarlyL8 headers & single out muffler, TK I/C
2011 R350 winter beater
2004 BMW R1100S
Old 05-11-2010, 10:01 AM
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Don't know your neighbors, how far away they are from your car, or their tolerance level... but I doubt they will like or tolerate any straight through glasspack type of muffler for long because they are all loud compared to a baffled muffler.

If you have a neighbor with a Harley Davidson and they tolerate that then a medium length straight through glass pack muffler should be quiet enough for them as long as extended idleing or tuning in the driveway isn't a common thing and doesn't piss them off.
Old 05-11-2010, 10:10 AM
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I have a custom build one but I'm tired of wrestling with it as much as I take it off
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10.76@139-1/4 mile
0-1 mile 193MPH
Old 05-11-2010, 01:01 PM
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Baffled mufflers are not an optimal design for use with turbos. The street version (straight through) I have on my car is very quiet at idle but wakes up progressively as the right foot goes down.

Juan is your turbo in the stock 930 location? Four bolt or v-band? 3"ID?
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 05-11-2010, 01:13 PM
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Hi Brian, is V band 3'' location is almost in front of the cam cover if thats the location of the 930




The entire job started with an oil leak from the turbo drain which goes to the cam cover, I have a new cover and this was the reason to install the new cover and re do the oil drain to a better location, while there it reminded me of how much hassle is to remove this muffler almost every month to install the short pipes or to work.

and during the process my beloved turbo has come to the end of his life, still going strong but only a fool will go any further, so a new turbo is on the way, the same one that the supras are making 900 hp will soon find a new place in my 911








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10.76@139-1/4 mile
0-1 mile 193MPH
Old 05-11-2010, 02:52 PM
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OFF THE BOOST PIPE NOW...
 
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^^^^ Whats going on with the turbo? Looks like FOD and/or sandblasted.
Old 05-11-2010, 03:05 PM
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What kind of air filter are you using Juan?
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Old 05-11-2010, 03:25 PM
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Now a K&N but the damage was already done, many runs without any filter, yea yea I should know better BUT the bottom line is that I had lots of fun
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10.76@139-1/4 mile
0-1 mile 193MPH
Old 05-11-2010, 03:49 PM
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Agreed, what's the point if you're not having fun
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87 930, 993 turbo engine, RS Tuning 520PS/515lbf-ft, Arrow Rods, ARP hardware, Solid lifters, G50-50, RS Flywheel, 890nm Sachs clutch, RSR coil overs all round, 993 C4 calipers front, 930 fronts on the rear, Ruf Speedlines.....
Old 540 BMW, XB12S Modified, for being a total hooligan
Old 05-11-2010, 04:51 PM
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No one said anything about a 42 lb cat / muffler.

So a stock euro chambered muffler is 30 v 12 lbs for a light weight glass pack style for a differance of about 18 lbs on a 700hp car.

Anything that is going to make most neighbors happy is probably going to be somewhere toward the heaver of the two.

Juan, look at David's muffler in post 5 above. Could you work somthing like that onto your existing muffler in place of your long fat tail pipe? You would want to keep the ID at 3" if you did.
Old 05-11-2010, 05:07 PM
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I'm been making my own mufflers for my n.a. cars. I make slip in baffles (perforated steel tubes wrapped in s/s wool) I use when on the street, then take them out at the track. I also made one that slips into the DP muffler for the turbo. I can feel a slight power loss at the top end with the baffles.
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Old 05-11-2010, 05:21 PM
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If I had to guess, your muffler looks like a Monty with wrap all around it.

Thats already quieter than ANY glasspack muffler on the planet including the one hyped to you above because it is not straight through.

Also you'll burn up and or blow out the packing in that homemade glasspack or whatever packing it uses..

Much slower cars with alot less horsepower than yours that don't do the 1 mile drag races have already burned them up and rendered them useless here in Florida.

Baffled mufflers that make the exhaust flow make a U turn at the far end of the inside of the muffler aren't optimal for horspower in a turbo or any car but if you need civilized sound level to keep the neighbors sane, or semi quiet so you can have a conversation without yelling over the resonant droning in the car there is no_other_way...

Last edited by JFairman; 05-11-2010 at 05:48 PM..
Old 05-11-2010, 05:24 PM
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Quote:
Much slower cars with alot less horsepower than yours that don't do the 1 mile drag races have already burned them up and rendered them useless here in Florida.
If you're going to blaspheme me at least tell the whole story.
The Florida car had a seized turbo. That tends to get a little warm. I've had 3 mufflers returned due to packing material melting, all 3 had heat issues and 2 required engine rebuilds. Melted packing material means you have a problem so I'm not changing the formula.

I replaced all 3 muffler bodies for free by the way.

Any muffler I might build for Juan (or an application such as his) will have stainless wool packing. This is not your typical street turbo. I make application specific products, please do not assume otherwise.

Juan you might also look into the modular bullit mufflers that have the screw-off ends made to be re-packed. They look like David's muffler body. It doesn't take much to quiet these cars down.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 05-11-2010, 07:02 PM
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I run less power than Juan obviously, at just over 400whp and on my 964 3.3 turbo as you know the set up is slightly different than a 930 3.3...

After the turbo charger(K27) Currently i run a straight through pipe(cat bypass) then into the standard 964 turbo rear silencer which i believe in not restrictive however i am on my second rear silencer which appears to be blowing again!..........Question is i had a discussion with the tuner i work with during my dyno set up work and he is of the opinion that at this power output 400whp plus he is very surprised my exhaust pipework diameter after the turbo is still only 3 inches....

What opinions on what to use(non restrictive but not too loud like zork) and at what dimensions after turbo?..similar to what David has looks good,,is that 3.5 inches in dia i see??
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Old 05-12-2010, 04:26 PM
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I wish I could leave this non Muffler set up

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10.76@139-1/4 mile
0-1 mile 193MPH
Old 05-12-2010, 05:28 PM
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