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Leland Pate's Avatar
 
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I got it in the car and took it for a test drive.

I never knew what "resonance" was until tonight.

Holy CRAP. My head is still ringing.
I love it.
No way I could drive this car every day with that pipe.
I's like being in a prop driven puddle jumper on takeoff!
Above 3K it mellows out to what it should sound like. WHHHHAAAAAAAAAAAAAAAAAAAAAAAAAAA!
Man, it sounds tough. But the resonance will kill the project.
No matter, I have a new pipe coming in next week.

Oh, and I do not care what people may say but the car was hands down FASTER. I gave it a couple gooses from 3.5K. BAM!
It totally reminds me of my old SC. Now we're talking.

I can't wait to get the new pipe in there and get it all buttoned back up.
Sadly, the FRANKENMUFFLER will now be torn apart to salvage the two imput flanges and pipes.

But, she will live on in my memory as the first major exhaust failure of my life.
There are sure to be more.

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Old 01-20-2004, 04:14 PM
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Exhaust Science?

What actually makes the resonance? Actually, what makes a Flowmaster (or any other muffler) sound so good? Is it mostly to do with the inards? the outlet pipes size?
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Old 01-20-2004, 04:31 PM
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Quote:
Originally posted by Leland Pate
Sadly, the FRANKENMUFFLER will now be torn apart to salvage the two imput flanges and pipes.
While you are waiting for it, open it back up and remove your little divider thing and make it into one big chamber.

May help, can't hurt, and don't cost nuthin'

Tom
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Old 01-20-2004, 04:48 PM
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Quote:
Originally posted by Leland Pate
But, she will live on in my memory as the first major exhaust failure of my life.
There are sure to be more.
Until my last effort, all my exhaust designs were colossal failures. Keeping it simple is a good approach. You'll love the Magnaflow.
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Old 01-20-2004, 04:50 PM
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Poor Frankenmuff...such a short life...full of promise...and then BAM!...one night of wild resonance and it's life is snuffed out. For what?! For just...just...being true to itself? (sniff)....we miss you Frankenmuff....
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Old 01-20-2004, 04:50 PM
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Mark Wilson
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Sort of a....Snuff-Muff, so to speak.
Old 01-20-2004, 05:01 PM
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Nice choice on the tips Leland--same as on my babe.
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Old 01-20-2004, 06:32 PM
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Well there were several lessons learned throughout this project.
I didn't order a SS Magnaflow simply because I can't weld SS.
I also learned quite a bit about heat warpage when it comes to welding precision joints. (Oh boy) But it was nothing a hammer couldn't fix.
Jon, I hope I like the tips too. If they look too big I'll find something else.

I also took a Mpeg. video clip of the exhaust clip. If someone wants to host it, I'll send it to them.
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Old 01-20-2004, 07:58 PM
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Leland,

Your exhaust will be very similar to mine. Yours will be a touch louder (in a good way). At first I put 3" tips on. There was a slight bit of resonance at 2,500RPM. I replaced the tips with simple 2 1/2" rolled stainless tips. There is no resonance anywhere in the power band and the muffler screams like an F1 at speed. In my opinion, the Magnaflow you are getting sounds better than a Flowmaster. If you need to fine tune the sound, consider exhaust tips the same diameter as your muffler input pipes.

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Old 01-21-2004, 05:47 AM
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Leland,
How big is the mpeg? I can host up to 1meg only. If it's under that send it my way.

MrCBoyle@aol.com
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Old 01-21-2004, 06:05 AM
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Quote:
I never knew what "resonance" was until tonight.

Quote:
What actually makes the resonance?
My theory is that when there isn't some point in the exhaust where the two banks combine, or cross over, you get resonance. My current exhaust is just a muffler on the end of each header, and it is deafening at around 3k.
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Old 01-21-2004, 06:30 AM
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A worthwhile repost for those that may have missed out. Muffler internals: http://www.fabspeed.com/993mufflers.html
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Old 01-21-2004, 06:51 AM
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Moses- where did you source those tips? Been looking for a little less bling-want to be rid of my 2.5 x 4 stainless tip.
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Old 01-21-2004, 08:30 AM
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Quote:
Originally posted by greglepore
Moses- where did you source those tips? Been looking for a little less bling-want to be rid of my 2.5 x 4 stainless tip.
You can get these anywhere. Just a rolled edge stainless tip, 2 1/2". Picked mine up at the muffler shop. Don't know who made them. They are inexpensive. I like stainless because it's easier to keep clean.
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Old 01-21-2004, 08:48 AM
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Leland,

I built the same design that you are trying last year using the cross over MagnaFlow with 2 1/4 inch tailpipes.

MAN IS IT LOUD!!!!!!!

Did I say it was LOUD!!!!!

Get on it between some houses or buildings and they will hear you coming for miles...

There is some resonance around 2200 rpm but you can modify your driving to avoid this area. Quite a bit of torque but it fell off a little on the top end compared to my Dansk 2/2.

I have some track video of full acceleration next to a concrete wall and it is loud but it sounded pretty sweet.

Get ready for the kids and neighbors to come looking at what just drove by....
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Last edited by Slider79SC; 01-21-2004 at 10:16 AM..
Old 01-21-2004, 10:13 AM
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Leyland-thanks for the education! I have been as far as the planning stage of just what you have done and I also had some problems with the width requirement of the muffler. I looked at my beautiful SSI heat exchangers , and sacrilige,I know, but they are joggled in to the center aft of the 3 into 1. How about a simple cut and 180 rotate which would bring the flanges out quite a bit,allowing a much longer muffler.I'm sure there is enough room under there.
Thats why those mufflers work so well with the other brand heat exchangers. Or even a straight pipe aft of the 3 into 1.
Old 01-21-2004, 11:40 PM
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Leland,

Here is another one that I built and tested.

This one sounded like a 917 howling down the front straight but it was way too loud for the wife....

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Old 01-22-2004, 06:07 AM
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So has anyone built a 1 in 2 out version yet to bolt to a 3.0-3.2 exhaust?
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Old 01-22-2004, 06:28 AM
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John,

Yep. Many guys use a Flowmaster/Dynomax/Magnaflow/whatever brand crossflow muffler that is a replacement muffler for a 82-up Camaro or Firebird.

Looks like this:



Here's a sound of Mark Wilson's 3.0 SC with a Flowmaster on it.

Mark's SC

Mark's SC at rest
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Old 01-22-2004, 07:46 AM
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Muffler configuration is like this:



Dynomax #17266 stainless steel. Around $150 I think.

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Old 01-22-2004, 07:55 AM
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