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I know it probably doesn't help your mid-mount, full-race setup, I had my exhaust off the car, and just weighed the muffler unit (with three hangers, 3" tip, and 3" connector pipe with a v-band) at 15.4lbs.
The one in this picture: https://www.miataturbo.net/attachmen...ine=1355600574 It's a magnaflow piece, and is fairly tame around town, but has some anger in it when you go WOT. I'd definitely be able to DD. And that's with no cat. When I was talking to Abe about my exhaust build, he gave me the options of loud, louder, and loudest. He said this one was apparently "louder". You might want to talk to him about mufflers, he has a lot of first hand experience. Fast forward to 1:05: Gives you a fairly good idea though, you really don't need much for a turbo race car. |
2 Attachment(s)
Only 15.4, thats lighter than I was expecting that big of a magnaflow to be heavier than that.
In the name of science I whipped up spreadsheet that calculates the frequency of exhaust noises from the firing cycle, it doesnt account for mechanical noise because I have no fucking idea of to calculate it. But this math wasnt that bad. Since I'm pretty set on going with a round glasspack at this point I really just need to pick the right length to cancel out the most sound at the frequencies I care about. From the spreadsheet I would actually want a body. The one piece of info its missing is an accurate estimate of the exhaust gas temp where the muffler would be, and it makes a huge difference. |
Originally Posted by Leafy
(Post 959705)
Only 15.4, thats lighter than I was expecting that big of a magnaflow to be heavier than that.
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Originally Posted by Savington
(Post 958108)
Magnaflow and Vibrant both make straight-through mufflers that are light and fairly cheap. You're going to have to do your own testing on the quiet part, though.
With Magnaflow 5x11x22 ~90-92dB Added Vibrant midpipe ~86dB |
Im about to do a POSSIBLY 3.5" system, if not 3" for a car with a 2560 and Use only a single hotdog, and shoot the exhaust straight out the US drivers side, Ill post results in this thread weight and volume wise.
Dann |
Originally Posted by curly
(Post 959493)
I know it probably doesn't help your mid-mount, full-race setup, I had my exhaust off the car, and just weighed the muffler unit (with three hangers, 3" tip, and 3" connector pipe with a v-band) at 15.4lbs.
It's a magnaflow piece, and is fairly tame around town, but has some anger in it when you go WOT. I'd definitely be able to DD. And that's with no cat. When I was talking to Abe about my exhaust build, he gave me the options of loud, louder, and loudest. He said this one was apparently "louder". Gives you a fairly good idea though, you really don't need much for a turbo race car. |
2.0L N/A BP4W 182whp - MX-5 Miata Forum
Originally Posted by naprotejay
what's the exhaust after the header?
love it, motor sounds great
Originally Posted by emilio700
2.5" mandrel bent, resonator in mid section with giant Magnaflow behind the axle. It's built to meet T25 sound of 92db. The 180° bend into and 90° bend out of the huge muffler help sound but probably cost a few hp. The car is very quiet from outside.
You could always do this: MX-5 Miata Forum - View Single Post - [NA] DIY Rotrex Miata Challenge Build http://forum.miata.net/vb/attachment...9&d=1291070621
Originally Posted by TrackDayHookey
One plus - fireballs on shifts were then visible in the rear-facing camera :D
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Yup I think it's the 5x11x22 Magnaflow. We eventually blew all the stuffing out of it and melted the interior partitions. So John at Hytech cut it open, repaired and stuffed with a bunch of new non-steel fiber packing. It weighs about 20lbs now but should last a full season. Resonator is a straight through, perforated core with packing around the outside. Last year we melted several of those and had to go to thicker gauge material in the resonators. 3 hrs @ 1100° destroys even 304 SS mufflers unless they're pretty burly. Our enduro exhaust are not light. I gave up trying to make light race exhausts a few years ago. Now the focus is on making them last a full season and being quieter that a street exhaust.
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