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| Is true dual exhaust a good idea for a 3800SC? (Page 3/4) |
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fieroguru
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SEP 12, 07:07 PM
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| quote | Originally posted by fieroaddicted:
here is a pic of the cutaway i found
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So it looks like the tail pipes pass completely through the chamber where the corner inlet dumps, so it does look like the two corner ports do more muffling than the center dump one. That is opposite of what I had previously assumed.[This message has been edited by fieroguru (edited 09-12-2014).]
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zmcdonal
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SEP 12, 07:08 PM
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I was thinking something like this:
I was just thinking it would get pretty messy having it all come into one collector and then have a cat somewhere and then split back off and go into both ends of the muffler. I don't know, it's hard to tell how much space I would really have to work with without actually having headers in hand and be able to see where the collector ends up and how the muffler looks mocked up into location. But I don't know which headers would be best, or if I should just set it up with the stock manifolds for now and forget the headers.
The actual muffler dimensions are 28" long 6" thick and 15" tall.
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dobey
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SEP 12, 07:53 PM
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| quote | Originally posted by zmcdonal:
I was thinking something like this:
I was just thinking it would get pretty messy having it all come into one collector and then have a cat somewhere and then split back off and go into both ends of the muffler. I don't know, it's hard to tell how much space I would really have to work with without actually having headers in hand and be able to see where the collector ends up and how the muffler looks mocked up into location. But I don't know which headers would be best, or if I should just set it up with the stock manifolds for now and forget the headers.
The actual muffler dimensions are 28" long 6" thick and 15" tall. |
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The big problems you have are the size of the muffler itself, and the headers you are talking about using. Those headers are designed for the Grand Prix, not the Fiero. On the Fiero, the rear header is going to interfere with that huge muffler. If you don't want to lose at least the bottom half of the trunk, the top side of the muffler will have to lean forward, and the outlets for the tips will be have to ground or cut off, and new outlet pipes welded on at the right angles and width to fit the Fiero. It's going to be very tight with those headers.
This is why I said you need to get the muffler mounted so you can see how much room you actually have. And I think the best solution for headers will be to have custom ones made (if you can't make them yourself).
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zmcdonal
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SEP 12, 10:17 PM
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Well I'm definitely not going to have custom headers made, that would be way too expensive. The only reason I am even considering headers is because there are affordable options.
That's another thing that makes this difficult, I don't know how to weld, so I have to have somewhat of a plan in mind before I take it to my exhaust guy.[This message has been edited by zmcdonal (edited 09-12-2014).]
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zmcdonal
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SEP 12, 10:22 PM
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| quote | Originally posted by dobey:
The big problems you have are the size of the muffler itself, and the headers you are talking about using. Those headers are designed for the Grand Prix, not the Fiero. On the Fiero, the rear header is going to interfere with that huge muffler. If you don't want to lose at least the bottom half of the trunk, the top side of the muffler will have to lean forward, and the outlets for the tips will be have to ground or cut off, and new outlet pipes welded on at the right angles and width to fit the Fiero. It's going to be very tight with those headers.
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The tips are narrower than the openings in the GT bumper so they need to be reworked anyway, that's why I was thinking to just lay the muffler flat and have the inlets facing up.
I guess I will need to remove my current exhaust so I can mock up the muffler and get an idea of the kind of room that I have to work with.
This is the current exhaust setup that's on the car. As you can see it takes up a lot of the trunk area.
 [This message has been edited by zmcdonal (edited 09-12-2014).]
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Darth Fiero
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SEP 12, 11:50 PM
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| quote | Originally posted by zmcdonal:
My idea behind having a true dual setup was more for ease of install and potentially take up less space. I didn't see a point in having it all sent into one collector only to split it up again for the dual inlets in to the muffler.
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The smallest possible exhaust system that takes up the least space is one like pictured below that hooks to the stock 3800 exhaust manifolds (yes, it is a single system that only splits in the muffler to dual outlets). You aren't going to get any simpler or more compact in size than this.
Granted the Magnaflow muffler in the above picture does require trunk wall massaging to get it to fit; but there are other brands of single in/dual out mufflers that will fit in a stock Fiero without any modifications being needed.
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zmcdonal
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SEP 13, 12:14 AM
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| quote | Originally posted by Darth Fiero:
The smallest possible exhaust system that takes up the least space is one like pictured below that hooks to the stock 3800 exhaust manifolds (yes, it is a single system that only splits in the muffler to dual outlets). You aren't going to get any simpler or more compact in size than this.
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Let me clarify, I know that true duals will take up more space typically and will not be the most compact. However with the muffler I am going to use I'm not sure how I would route things and use less space with a single collector a cat and then split to reach both inlets. Seems like it would have to snake back and forth a lot.
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Zac88GT
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SEP 13, 01:58 AM
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I'm still waiting for somebody to use one of these:
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Patrick
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SEP 13, 01:59 AM
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I've only ever heard one 3800sc that I've liked the sound of. And that's the 3800sc that's in John Carlo's car (which is currently in transition). Blair up here in BC put this engine in and custom built the exhaust and it sounds beautiful. I have an autocross video here shot back in 2010. It was the first time that John had ever been on a track. He was nervous and was just taking it easy... but listen to his car! 
The first Fiero (with no suspension  ) in the video has a stock 2.8 in it, and then John goes for a cruise. You won't believe this is a 3800sc.
Click to view the video - HERE. (It should open in it's own window.)
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zmcdonal
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SEP 13, 11:51 AM
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| quote | Originally posted by Patrick:
I've only ever heard one 3800sc that I've liked the sound of. And that's the 3800sc that's in John Carlo's car (which is currently in transition). Blair up here in BC put this engine in and custom built the exhaust and it sounds beautiful. I have an autocross video here shot back in 2010. It was the first time that John had ever been on a track. He was nervous and was just taking it easy... but listen to his car!
The first Fiero (with no suspension ) in the video has a stock 2.8 in it, and then John goes for a cruise. You won't believe this is a 3800sc.
Click to view the video - HERE. (It should open in it's own window.) |
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That thing does sound sweet! After searching around I found a pic of his setup, he says it's a spintec muffler that's all he's knows about it.
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