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inside the resonator there is an open common area that the two pipes open up to which would act as a sort of makeshift H pipe. If so, torque could theoretically be affected, but the difference should be neglible.
Last edited by Tom400CFI; Aug 2, 2015 at 11:35 AM.
I'm going to have an x pipe put on this week , I'll see how that does , I've checked the car over myself and see nothing our of the ordinary , my top end don't seem to b affected at all just some of the low end torque, looking at the inside of the resonator I see some holes in each of the pipes , it seems those would have to b there for a reason , and seeing the picture of the inside of the resonator on here it looks like it was meant to do something, although I think the loss of torque isn't as bad as I actually thought at first but it's still there for sure
I'm going to have an x pipe put on this week , I'll see how that does , I've checked the car over myself and see nothing our of the ordinary , my top end don't seem to b affected at all just some of the low end torque, looking at the inside of the resonator I see some holes in each of the pipes , it seems those would have to b there for a reason , and seeing the picture of the inside of the resonator on here it looks like it was meant to do something, although I think the loss of torque isn't as bad as I actually thought at first but it's still there for sure
I believe those holes in Tom400CFI's pic are there to tune the sound. The real work is being done by the common space, acting as an H-Pipe/X-Pipe. According to the following article in SuperChevy, an X-Pipe offers a little more HP than an H-Pipe and... an H-Pipe adds a little more torque than an X-Pipe. Both add power over straight duals.
OP... Have your exhaust people look for an obstruction in whatever they replaced your resonator with.
I believe those holes in Tom400CFI's pic are there to tune the sound. The real work is being done by the common space, acting as an H-Pipe/X-Pipe. According to the following article in SuperChevy, an X-Pipe offers a little more HP than an H-Pipe and... an H-Pipe adds a little more torque than an X-Pipe. Both add power over straight duals.
OP... Have your exhaust people look for an obstruction in whatever they replaced your resonator with.
Thank you drdyno for the info it was very useful , I'm going in the next few days to have an x pipe put on , hopefully that will please me a bit more , i will say though I do like the sound it has now, sounds much meaner
no resonator with factory mufflers
h pipe with factors mufflers
x pipe with factory mufflers
When I had no resonator and straight pipe (no crossover) I too thought it was missing some torque down low. H pipe added the torque back but I wasn't happy with the sound. X pipe was best of both worlds, no power loss and a modern muscle sound.
no resonator with factory mufflers
h pipe with factors mufflers
x pipe with factory mufflers
When I had no resonator and straight pipe (no crossover) I too thought it was missing some torque down low. H pipe added the torque back but I wasn't happy with the sound. X pipe was best of both worlds, no power loss and a modern muscle sound.
Thank you for the info , I'm glad to hear from someone who has tried all the combinations, I'm definately missing some torque down low so I'm hoping the x pipe will solve my problem
A most excellent picture post, Tom!
Thanks so much for posting that.
So going by the picture, correct me if I'm wrong, but it looks to me like the left and right side exhausts are actually independent of each other (like a true dual exhaust) within the unit and that there is no opening or common area shared by both pipe sides together that would result in the mating of both left and right banks for improved exhaust scavenging of the cylinders like that of an H or X pipe.
Going by this, it looks like the factory setup is still a true dual exhaust internally (despite the single unit of the resonator) with no crossover or shared area within the resonator. Is this correct?
If so, removal of the resonator should have even less effect on bottom end/torque.
I have attached your picture below with a red circle around the two walls separating the left and right (driver and passenger) side exhaust within the resonator unit itself. If those walls in the circle did not exist, then the resonator would have shared/equalized pulses and would have acted as a makeshift X or H pipe of sorts, meaning that removal of the resonator and replacing with two pipes might actually have had more effect, either good or bad.
However, looking at the picture, it looks like this is not the case and it is a true dual exhaust after all so removal should have had an even more negligible effect. The picture helped a lot!
Since there was no shared common area within the unit, it looks like any aftermarket X pipe would be an upgrade, as opposed to functioning as a way of putting back what was lost when the resonator was replaced with two pipes (which turned out not to be the case after all due to the independent internals).
Originally Posted by Tom400CFI
Last edited by LANDSHARK1; Aug 2, 2015 at 03:30 PM.
A most excellent picture post, Tom!
Thanks so much for posting that.
So going by the picture, correct me if I'm wrong, but it looks to me like the left and right side exhausts are actually independent of each other (like a true dual exhaust) within the unit and that there is no opening or common area shared by both pipe sides together that would result in the mating of both left and right banks for improved exhaust scavenging of the cylinders like that of an H or X pipe.
Going by this, it looks like the factory setup is still a true dual exhaust internally (despite the single unit of the resonator) with no crossover or shared area within the resonator. Is this correct?
If so, removal of the resonator should have even less effect on bottom end/torque.
I have attached your picture below with a red circle around the two walls separating the left and right (driver and passenger) side exhaust within the resonator unit itself. If those walls in the circle did not exist, then the resonator would have shared/equalized pulses and would have acted as a makeshift X or H pipe of sorts, meaning that removal of the resonator and replacing with two pipes might actually have had more effect, either good or bad.
However, looking at the picture, it looks like this is not the case and it is a true dual exhaust after all so removal should have had an even more negligible effect. The picture helped a lot!
Since there was no shared common area within the unit, it looks like any aftermarket X pipe would be an upgrade, as opposed to functioning as a way of putting back what was lost when the resonator was replaced with two pipes (which turned out not to be the case after all due to the independent internals).
I believe those two halves fold to form the resonator. Picture folding the bottom half up and over the top half... creating a common area.
Now I see what you mean. I was initially under the impression that it had been cut across from the bottom up and that was only the bottom half of the resonator with the top half unseen.
After reading what you wrote, I now realize that is the whole unit, cut lengthwise down the middle. So there is a shared common area for sure then.
Totally appreciated!
Originally Posted by DrDyno
I believe those two halves fold to form the resonator. Picture folding the bottom half up and over the top half... creating a common area.
Yep, you guys "get it". It does share common space.
Remember though; the exhaust gets to an "open space" before the resonator, and that is in the Cat housings. There isn't likely much or any "exhaust tuning" going on after that point (other than sound).
Now I see what you mean. I was initially under the impression that it had been cut across from the bottom up and that was only the bottom half of the resonator with the top half unseen.
After reading what you wrote, I now realize that is the whole unit, cut lengthwise down the middle. So there is a shared common area for sure then.
Totally appreciated!
If the two halves in the photo folded to place one above and one below, wouldn't the two separate pipes on the right then be stacked also?
That makes me think the photo shows only the top or bottom half, with the other half being not shown.
The pic is of a resonator. The camera is "above" the resonator, as the resonator sits in the car. They cut the resonator in 1/2, down the middle, length wise. Once cut, each half is "folded" away, or rotated away from the camera, exposing the insides of each half.
Look at the photo again; you there are 4 pipes; two on the left (the inlet) two on the right (the outlet). If that item in the pic was only half the resonator....what would do w/a resonator that had 4 inlets and 4 outlets?
If the two halves in the photo folded to place one above and one below, wouldn't the two separate pipes on the right then be stacked also?
That makes me think the photo shows only the top or bottom half, with the other half being not shown.
If it was folded back together, the resonator would be sitting on it's edge. Lay it flat and then the two pipes are right next to each other like they are under the car.
In essence, the resonator in that pic has been cut along it's center-line and then each half rotated/split apartso you can see inside. It's a complete part, not just an upper or lower half. Imagine the cut right down the center line...
If it was folded back together, the resonator would be sitting on it's edge. Lay it flat and then the two pipes are right next to each other like they are under the car.
In essence, the resonator in that pic has been cut along it's center-line and then each half rotated/split apartso you can see inside. It's a complete part, not just an upper or lower half. Imagine the cut right down the center line...
You're way overthinking it.
That's a great pic of the whole exhaust system off the car it gives a great look at how everything is running
I thought the fold was top to bottom thus stacking the inlets and outlets, which makes no sense as you observed.
Thanks for the explanation. I now see the fold is right and left along the centerline , thus keeping the inlets and outlets in the same vertical plane.
You will not regret getting an x pipe. I have one on my 93 along with magnaflow axle back, the sound is great but in my personal opinion going from resanator to x pipe didn't produce any noticible changes in performance. In terms of your touque loss, the x pipe should solve it and even if it doesn't, at least it'll sound good.
I too have had my resonator replaced by two individual pies on my 1994 M6 Coupe. Like most others, I was going for an increase in sound and not for a performance gain, or in the OP's post, loss. As far as a loss of power, my butt-o-meter has not registered it. The sound on the other hand is noticeable. I don't want to increase the volume like it has open headers, therefore I am taking little bites at it. If I could increase the volume of what I have now to say 50% of what removing the resonator did for it, I believe I would be happy and call it done. Does that make any sense to anyone? I believe the next step will be a muffler replacement of some sort. At any rate, to sum it all up, I have not noticed the power loss as mentioned. I also like the popping noise upon coasting, too.
I too have had my resonator replaced by two individual pies on my 1994 M6 Coupe. Like most others, I was going for an increase in sound and not for a performance gain, or in the OP's post, loss. As far as a loss of power, my butt-o-meter has not registered it. The sound on the other hand is noticeable. I don't want to increase the volume like it has open headers, therefore I am taking little bites at it. If I could increase the volume of what I have now to say 50% of what removing the resonator did for it, I believe I would be happy and call it done. Does that make any sense to anyone? I believe the next step will be a muffler replacement of some sort. At any rate, to sum it all up, I have not noticed the power loss as mentioned. I also like the popping noise upon coasting, too.
Cessnaguy
For well under $100.00, your local muffler shop can fabricate an H-Pipe for you (my shop charged me $60.00, each, for the two you see below). If I'm understanding your post it should give you pretty much what you're looking for: slightly lowered volume with a more even tone and... a bit more power, to boot!
When I had just muffler eliminators (and still had the resonator), I had the H-Pipe placed just in front of the spare tire housing (first Pic, below).
When I went to an Allen Stainless chambered dual exhaust, I had an H-Pipe fabricated just behind the transmission (second pic, below). Both worked about the same.
i had an x pipe put on today, sounds great and seems to have good torque and is running good , so all is well , i really appreciate everyone's input and advice , corvette owners are the best! !
For well under $100.00, your local muffler shop can fabricate an H-Pipe for you (my shop charged me $60.00, each, for the two you see below). If I'm understanding your post it should give you pretty much what you're looking for: slightly lowered volume with a more even tone and... a bit more power, to boot!
When I had just muffler eliminators (and still had the resonator), I had the H-Pipe placed just in front of the spare tire housing (first Pic, below).
When I went to an Allen Stainless chambered dual exhaust, I had an H-Pipe fabricated just behind the transmission (second pic, below). Both worked about the same.
