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I finally got a workable baffle for my 1-in, 2-out M&K. It took forever (and killed two grinding wheels and an engine bore hone) to completely grind out the previously welded in "tweety-bird" baffles.
Ben sent me a couple of his internal exhaust caps. Think of a tomato can cut in half, but in perfectly welded stainless. Anyway, I bored a hole in one cap about 1 1/4"(saving the other for smog check - single outlet required here for the visual check), and installed it in the loud side. Rather than the bolt Ben supplied, I riveted it in. This looks a little tidier and is still removable. My muffler is a semi-custom job with the outlets RSR style. I.e., 2 1/2" outlets spaced about as far apart as the edges of the engine cover. This means the single inlet is almost a straight shot out the driver side, hence very loud. So, it has gone from VERY LOUD (as in set off all the car alarms in my office building parking structure) to merely loud with no tweeting, and no drone. There is a little, less than before, crackle on overrun. For me, a very acceptable result. Thanks Ben. p.s. - No dyno runs yet. I can now dyno it for a SW chip to get the a/f right, but no before/after runs for the exhaust itself. |
Well... will see (or will hear...)
As one of my winter project, I be installing the SSis as well as M&K 2 In 2 Out from Ben.
I did order both the internal and external plug... just in case. Not sure I'll require them because as it stand now, I got a 1 In 2 Out (added functional pipe to a stock muffler), which I love the sound when the top is down but hate it when the top is on (which only happen when it's raining like this morning... 250 miles to a cancel show...). From the above and other threads, I'm guessing that most people that don't like the 2 In / 2 Out sound are driving a coupe. Time will tell :D;):D http://forums.pelicanparts.com/uploa...1282523883.jpg |
Has anyone tried the super trapp diffusers, not so sure about the looks or if it will work, but they are tunable by adding or reducing disks.
SuperTrapp 444-2503 - SuperTrapp Disc-Only Mufflers - Overview - SummitRacing.com http://forums.pelicanparts.com/uploa...1282526277.jpg http://forums.pelicanparts.com/uploa...1282526292.jpg |
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anyone in northern NJ have a dB meter handy? Lewis |
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I would think a real baffle, which will create some backpressure and force the air around and through a different route, would work better. I have an idea on how to make a very simple, temporary one out of a heavy 2" diameter flat washer (with a 1/2" hole or bigger) and a 1/4" bolt. Would require a 1/4" hole being drilled in the bottom (or side, or anywhere else) about 1" or less into the tailpipe.. Cut the head off a 1/2"L x 1/4"D fine thread bolt. Weld the heavy 2" washer to it upright (think lollipop with a short stick). Insert both through hole you drilled and use a thin 1/4 flat washer and a nylock nut to secure. You can try it at different angles but at 90 degrees it would do the most "baffling". May not do anything but for a cost of about $2 total WTH! |
I am surprised that there is nothing available that is spring operated and work on the exhaust pressure - so at idle the valve would be closed by the spring, and as the pressure is increased with higher revs the pressure would open the spring loaded valve. Almost like the pop-off valve that you can get for the 3.0 air box!
That would be a nice low-tech solution. Maybe even have the spring replaceable with different size depending on engine size and desired volume - Ben start designing I want one for my M&K 2out ;) |
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The aftermarket motorized exhaust valve is also an option. Rig it to operate via vehicle speed, RPM or throttle position signal. Sherwood |
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The after market motorized ones are interesting, but heavy in comparison to something that would be spring/pressure based... Just my thoughts on the subject. |
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YouTube - Supertrapp testing with Porsche 911 3.6 |
You worried the Police are going to stop you Mr. Jaskas ;)
Maybe the two of us will have to find a good solution to make the 3.6 more Laillinen ;) |
Well, my bored out inside baffle (see above) passed it's first litmus test - I drove it to the office today and it didn't set off a single car alarm in the parking structure.http://forums.pelicanparts.com/support/smileys/wat6.gif
Now, it's not exactly politically correct, but it's a lot better. For anyone contemplating a similar baffle, please note the sound level is now about the same side to side. It was decidedly louder on the driver side before. But, the sound quality differs from side to side. That's not unexpected since one side is breathing out of a 1 1/4" hole and the other is 2 1/2". If you wanted it even quieter, a smaller hole in the baffle would help. A baffle inside the muffler directing some of the flow to the passenger side would probably be better, but that's way beyond my skill level. Ben? JJ - your setup should be better as it's not flowing straight from the inlet(s) to the outlets. super9064 - IMO the Supertraps sound pretty crappy. You might want to listen to someone's car that has them before committing. |
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Best, Doyle |
Can't wait to find out...
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As our driving season is so short that I don't want to take a change and run run into trouble and loosing driving time. In October, I'll get my S.W. chip up date and the winter will be great for majors projects; drop the engine (1st time), SSIs, M&K Muffler, full brake job (cross drill and SS lines), Clutch cable, shifting bushing and the likes :D;):D |
alright, I tried
I tried 2 of the vortex inserts, and can say, in my car they did nothing. I used an app for my phone, a dB SPL meter, was getting 122 dB SPL with and without the cones, and the drone remained exactly the same.
these will be returned to Summit. Lewis Quote:
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I'm going to order 2 baffles from Ben Monday and also try the end cap you gave me Lewis. Need to see which will work better. I'll be with you at LRP in getting black flagged. I'll have Scott at Auto Associates test which works better.
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I´m trying to fit some small extra mufflers to my system. If i only get them to fit under the car somehow This is my setup at the moment: http://i216.photobucket.com/albums/c...s/IMG_6269.jpg http://i216.photobucket.com/albums/c...9042010128.jpg Sometimes i put on the supertrapps, when i get tired of the noice, or the girlfriend want´s to borrow the car. |
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