Looks and sounds incredible! May I ask who does your fabrication? :smile:
My new X pipe creation
- Thread starter NSXDreamer2
- Start date
update: I had to get my car's emission done and with oem cats, the noise level are almost 1/2 of the one with test pipe. Nice thing about it is when it's over 4000rpm, you still have the same tone all the way to redline.
The dronning noise is a lot more liveable and also with lower volume.
Again, the exhaust is taking baby step but we will produce it if I have enough interest, as is or with further modification. The projecting cost is $1800-$2000 depending on the production number.
Please pm me if anyone is interested.
The dronning noise is a lot more liveable and also with lower volume.
Again, the exhaust is taking baby step but we will produce it if I have enough interest, as is or with further modification. The projecting cost is $1800-$2000 depending on the production number.
Please pm me if anyone is interested.
- Joined
- 2 May 2010
- Messages
- 46
nice, i like the sound of it.
Dave,
What are your thoughts about Corsa's muffler technology to address the NSX drone issues?
http://www.corsaperf.com/technology.aspx
All of the V8 guys love it. Made their cars sounds more like a Euro V8 with no drone.
didn't get it.
I'm a slow typer!
Hey! I'd like to get in on that PM too 
or is this just for the popular kids? haha
or is this just for the popular kids? haha
Sorry - I just didn't want to go too off-topic on his thread.
Forwarded you the PM!
Dave
Forwarded you the PM!
Dave
No, u could have addressed it on here and it would be appropriate.
Especially the part where u "praised me" for thinking outside of the box and not drinking the "Weapon N" ricer exhaust. :biggrin:
That's why I like what NSXDreamer2 has done.
It's low restriction, sounds good, light weight, and good quality. Just trying to help with the problem frequency part since I've done some research in that area.
Dave
It's low restriction, sounds good, light weight, and good quality. Just trying to help with the problem frequency part since I've done some research in that area.
Dave
I just got off the phone with Corsa and here is what I learned:
I mentioned the guy on youtube that ran a Supercharged V6 late model mustang and he was using the mufflers for the V8 Mustang. He did say that he saw that video and there was no droning. He said it was the Touring muffler that was quieter.
http://www.youtube.com/watch?v=3SSX...7C4C702F&playnext_from=PL&playnext=1&index=25
The race mufflers have less baffles for the sound, not exhaust flow.
Dave, any idea as to what the NSX noise dynamics would be like if I used a muffler tuned for 110 - 130Hz?
Is it more of a hit or miss situation or would some, if not all of the resonance go away?
- Years ago they did have an NSX in their shop, but dropped the project since the projected sales numbers would be too small to recover the R&D. Furthermore, they wanted to focus their branding on the domestic and Euro cars.
- They did note that it was a more fussy car to work with (firing frequencies, etc.)
- The mufflers are not sold at "universal mufflers". Each muffler is designed for the specific car.
- Most of their mufflers range from 110 - 130 Hz.
I mentioned the guy on youtube that ran a Supercharged V6 late model mustang and he was using the mufflers for the V8 Mustang. He did say that he saw that video and there was no droning. He said it was the Touring muffler that was quieter.
http://www.youtube.com/watch?v=3SSX...7C4C702F&playnext_from=PL&playnext=1&index=25
The race mufflers have less baffles for the sound, not exhaust flow.
Dave, any idea as to what the NSX noise dynamics would be like if I used a muffler tuned for 110 - 130Hz?
Is it more of a hit or miss situation or would some, if not all of the resonance go away?
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Cool, I hadn't seen the race muffler picture before. Corsa has an excellent package - it's a lot more elegant design than my simple, effective, yet ugly tube. Any idea what diameter the race muffler above is? Assuming it's 3" (common "race" diameter), scaling off the picture would yield a tuned resonator length of ~30inches. From my linked post below, that is ~125Hz - in the range the Corsa rep told you they tuned for 
http://www.nsxprime.com/forums/showpost.php?p=1293812&postcount=9 It's just simple sound theory
This is my car around 2200RPM's and a slight load:
Right in the middle of our resonance range (2000-2500RPM), the peak frequency at 2200RPM is 105Hz. So, if you could get one of their models tuned for 110Hz, it might be acceptable. That would mean you would have a slight drone around 2000RPM that would quickly go away as your RPM's climb up to 2500RPM's.
Dave
http://www.nsxprime.com/forums/showpost.php?p=1293812&postcount=9 It's just simple sound theory
This is my car around 2200RPM's and a slight load:
Right in the middle of our resonance range (2000-2500RPM), the peak frequency at 2200RPM is 105Hz. So, if you could get one of their models tuned for 110Hz, it might be acceptable. That would mean you would have a slight drone around 2000RPM that would quickly go away as your RPM's climb up to 2500RPM's.
Dave
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The person that I spoke to didn't want to give me any of the internal dimension information.
Only info that I got for a late model mustang exhaust was that the outside casing size was 16" long, which is about the same as my Moroso Spiral Flow that are currently on there.
There is no information on the weight of the mufflers by itself, but with tips and about 1 feet of SS pipe they were 32lbs for the touring one. I suspect the weight may have to do with all the metal that they use inside.
Only info that I got for a late model mustang exhaust was that the outside casing size was 16" long, which is about the same as my Moroso Spiral Flow that are currently on there.
There is no information on the weight of the mufflers by itself, but with tips and about 1 feet of SS pipe they were 32lbs for the touring one. I suspect the weight may have to do with all the metal that they use inside.
I'm still amazed they divulged what frequencies they were trying to tune out
While the theory is straight-forward, you still need to have a decent microphone/sound card, laptop, and signal-processing equipment to measure what's going on in your specific car.For Corsa's, as you can see from the pics, case size has little meaning with all those concentric cylinders stuffed in there to get the length they need.
32lbs is a bunch.... My no-droning setup was around 12lbs. Less if I used the aluminum tube for the resonator that's sitting on the garage floor.
Thanks for researching those!
Dave
I'm still amazed they divulged what frequencies they were trying to tune out
For Corsa's, as you can see from the pics, case size has little meaning with all those concentric cylinders stuffed in there to get the length they need.
32lbs is a bunch.... My no-droning setup was around 12lbs. Less if I used the aluminum tube for the resonator that's sitting on the garage floor.
Thanks for researching those!
Dave
I may pull the trigger to buy a set of the Touring mufflers to try them out.
If so, I'll post results.
I'm amazed that this forum has VERY little knowledge base in getting rid of the drone.....
In your conversations with the rep (thanks for doing that leg work btw) did they mention if they would sell individual cannisters outside of the car specific kits they sell? Cost?
On a side note, the Corsa muffler looks like it goes thru an intricate assembly process. It can't be cheap and it might be a tad on the heavy side. I would be curious to know the weight. If two cannisters reaches 25lbs or so, I would be concerned at which point then the 2"x36" long tube starts making more sense.
I think BATMAN said each was around 30lbs
I guess it's not surprising given all the steel inside each canister. If that's the weight from one canister, I would just combine each bank like I did into a single 3" or larger pipe, then only use one of these mufflers (like a center exit or something like that).The 2"x36" aluminum tube is around a pound :wink:
Dave
They don't sell individual cannisters since, according to them, each cannister is custom taylored for the specific car application. This includes, tips, pre-bent tubing, hangers, and hardware.
I've located a used set off a Mustang with very low miles (not that it really matters since it's SS construction and has no glass packing to wear out) that I will probably procure once I get some vital information from the seller on dimensions, etc. My plans, once the muffler is in my possession, are to cut the tubes off the muffler and replace my current 3.5lbs Moroso Spiral flow mufflers with them on each side. I will let you know how much the individual mufflers weigh.
According to the rep at Corsa, they are the touring mufflers, which are the quietest and have the least amount of "metal tin" sound. They are also the heaviest. He said that if I want something closer to the Ferrari stock exhaust in tone, decibels, etc. this is their best muffler for the job.
Yes, the mufflers are heavier since they have multiple sheet metal layers for the desired effect.
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I think BATMAN said each was around 30lbs
The 2"x36" aluminum tube is around a pound :wink:
Dave
I'm guesstimating that both of these Corsa mufflers setup will be somewhat tantamount to the factory exhaust system weight.
Dave, perhaps I missed this, but where exactly do u place that "metal penis" on your exhaust body? does it have to be at a specific part of the exhaust governed by a specific distance from the engine and/or chassis? Or is it a matter of placing it anywhere on the exhaust tubing?
thanks for the bump guys, again, if anyone interested, please PM me. I'm just focusing my own work right now; so I didn't have a chance to install that "resonating bridge", which IMO is the best solution if it works.
However the sooner I get pm or "order", we will tackle this right away.
However the sooner I get pm or "order", we will tackle this right away.
Dave, maybe we should resume this conversation back over on your thread instead of whoring out NSXDreamer2's thread
u guys are funny
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