SSR down pipes + Thermal cat back = DRONE

[Adamdan]

Curious, what do you mean by wrapping? And with what?

Wrapping the downpipes with heat wrap.

 

[Andimal]

Wrapping the downpipes with heat wrap.

What are the benefits all around? I understand the negatives, cosmetically.

 

[Adamdan]

I have the ssr dp and junbl gt non evc.
I do not notice anything I'd consider rasp at all. Loud yes resonance yes cruising at comfort but not that bad. I will soundproof eventually.
I dont get rasp but gurgles when downshifting or coasting. Very mellow burbles but makes me happy hearing it. The poor man's pops bang crackle. I'm ok w that

To make my car rasp I have to put It in 3rd then when rpms are at around 1800 give it some heavy throttle and as the rpms pass 2000-2200 I get some rasp.

 

[Adamdan]

What are the benefits all around? I understand the negatives, cosmetically.

It can quiet raspy pipes. It also keeps all
The heat in the pipes. I’ve never done it myself I just read of people with 350z do it. Some people say it’s not good for the pipes though.

 

[Hojae84]

It can quiet raspy pipes. It also keeps all
The heat in the pipes. I’ve never done it myself I just read of people with 350z do it. Some people say it’s not good for the pipes though.

Also if living where it snows, its traps moisture and rust the dp. If you dont get snow I dont see that much downside tbh

 

[Andimal]

Also if living where it snows, its traps moisture and rust the dp. If you dont get snow I dont see that much downside tbh

Does that regard any type of precipitation? Pretty sure snow would melt when it hits the DPs wrapped or not. So rain is also a concern? Or is it related to the salt?

 

[Hojae84]

Rain isn't as bad. Should be fine.
Snow and salted road is killer. Water and salt stays soaked to wrap as do salt.
Will turn rusty fairly fast..
Rain ok I'm sure the heat would evaporate it eventually and ni sakt w rain

 

[Hojae84]

I'd say that sounds like the vibration/buzz that I'm hearing, which is definitely not rasp. I've noticed a small amount of rasp, I'll pay a little closer attention next time I take her for a spin. Are you running the same set up as me? Curious how the jun's sound.

Here is a short clip of a quick rev. Its snowing and got snooty neighbors cant be too loud.
Anyway
Ssr dp, jun bl gt non evc, tork intakes

 

[Hojae84]

To make my car rasp I have to put It in 3rd then when rpms are at around 1800 give it some heavy throttle and as the rpms pass 2000-2200 I get some rasp.

I'll give this a go see if I get the same on my setup

 

[Jwolf]

So as I said before I have the Ark Grip and SSR downpipes, but have the same issues in the same RPM range as you guys. The sound deadening in the trunk and under the seats made a huge difference and I can live with it now, buttt I am going in to an exhaust shop this weekend to see about putting on additional resonators/bullet mufflers in the dps. I think that the issue is the downpipes are thinner and lighter than stock and just resonate really bad between 1800 and 2300 rpm. I can actually hear the tone inside the car now with the sound deadening, and I don't like the sound so I'm hoping if I add some resonators near to or upstream a little from where the stock cats were, it will help tone down the rasp/drone. Maybe it won't, and I don't know if anything will fit there yet either. But I'll keep you guys posted.

 

[Hojae84]

So as I said before I have the Ark Grip and SSR downpipes, but have the same issues in the same RPM range as you guys. The sound deadening in the trunk and under the seats made a huge difference and I can live with it now, buttt I am going in to an exhaust shop this weekend to see about putting on additional resonators/bullet mufflers in the dps. I think that the issue is the downpipes are thinner and lighter than stock and just resonate really bad between 1800 and 2300 rpm. I can actually hear the tone inside the car now with the sound deadening, and I don't like the sound so I'm hoping if I add some resonators near to or upstream a little from where the stock cats were, it will help tone down the rasp/drone. Maybe it won't, and I don't know if anything will fit there yet either. But I'll keep you guys posted.

Any chance you can put up a clip of this tone that appeared after sound deadening?
Also adding resonator/bullets wouldnt that negate hp gains from the dp?

 

[Adamdan]

So as I said before I have the Ark Grip and SSR downpipes, but have the same issues in the same RPM range as you guys. The sound deadening in the trunk and under the seats made a huge difference and I can live with it now, buttt I am going in to an exhaust shop this weekend to see about putting on additional resonators/bullet mufflers in the dps. I think that the issue is the downpipes are thinner and lighter than stock and just resonate really bad between 1800 and 2300 rpm. I can actually hear the tone inside the car now with the sound deadening, and I don't like the sound so I'm hoping if I add some resonators near to or upstream a little from where the stock cats were, it will help tone down the rasp/drone. Maybe it won't, and I don't know if anything will fit there yet either. But I'll keep you guys posted.

This might work

 

[Jwolf]

Any chance you can put up a clip of this tone that appeared after sound deadening?
Also adding resonator/bullets wouldnt that negate hp gains from the dp?

The tone didn't appear after deadening. It's just now that the drone is not so noisy in the car, I can actually hear what the exhaust sounds like at thay rpm range under load and it isn't a good sounding exhaust to me. Kinda ricey.

And as far as resonators or bullet mufflers go, no they are straight through and do not affect flow at all. They only very slightly lower the decibel level, if at all, and mainly are there to absorb or cancel out raspy or high pitch notes. This allows just the deeper, better sounding notes through which I'm hoping will fix the issue. Otherwise it seems from everyone having the same feedback, that the length, shape, weight, and thickness of the SSR downpipes paired with our specific motor just can't overcome the resonance at the frequency around 2000 rpm.

 

[Jwolf]

View attachment 15220
This might work

I've thought about that, but I would really like to keep my Ark exhaust as I love the sound it had before the dps and I still really like it except that small range of rpms. And I also thought about adding additional mufflers there, but I really don't want to alter it since it was such an expensive aftermarket exhaust and I may want to sell it one day. And from doing a lot of research on this, I've discovered that this particular issue is best addressed as far upstream in the exhaust as possible. The reverberation will continue to exist everywhere upstream from where the resonance is cancelled.

Since the issue is new since the dps, and the dps are completely unresonated/unmuffled, I think the solution will be better placed there. However, the space there is really limited. Those magnaflow mufflers would never fit on the dps, I need something with a much smaller OD. I'm hoping to be able to fit a dynomax race bullet muffler, but even that might be too large in which case I will reconsider modifying the catback.

 

[Adamdan]

I've thought about that, but I would really like to keep my Ark exhaust as I love the sound it had before the dps and I still really like it except that small range of rpms. And I also thought about adding additional mufflers there, but I really don't want to alter it since it was such an expensive aftermarket exhaust and I may want to sell it one day. And from doing a lot of research on this, I've discovered that this particular issue is best addressed as far upstream in the exhaust as possible. The reverberation will continue to exist everywhere upstream from where the resonance is cancelled.

Since the issue is new since the dps, and the dps are completely unresonated/unmuffled, I think the solution will be better placed there. However, the space there is really limited. Those magnaflow mufflers would never fit on the dps, I need something with a much smaller OD. I'm hoping to be able to fit a dynomax race bullet muffler, but even that might be too large in which case I will reconsider modifying the catback.

That picture with those small magnaflow mufflers might fit on the downpipes that’s what I was thinking. That or a high flow cat will probably be your best bet. Resonators are 12-15 inches usually and there is not much room on the downpipes. But those small magnaflows or a high flow cat should fit. Let me know how it goes. I really hope my rasp will get taken care of with the jun evc since it has a larger resonated x pipe. If not I will start looking at other options. It’s hard to tell how big those magnaflow mufflers are but something similar to that.

 

[Jwolf]

Alright guys latest update...

I picked up a set of Borla XR-1 race mufflers, part # Borla 40641, in the hopes that they were skinny enough to fit on the dps. Well, there is no chance. There is no possibility to alter the dps in any way as they are less than 1/2" from the heat shielding above them at the closest point.

So, as an experiment, I put the stock midpipe back on (midpipe from the cat back, not the downpipes). Omg the difference is crazy even with the aftermarket muffler. It's like the drone almost completely dissappeared except a very, very small amount around 70 mph under load. (Also the dynamat probably is doing domething here, don't forget I have that.)

So right now, instead of sitting on the world's most expensive axle back, my car is at the shop having a custom axle back created. I'm hoping to utilize the XR-1s since I have them, but am concerned about drone again. If it is bad, I will have additional resonators (vibrant ultra quiet) added to the custom axle back and see what that does.

 

[Jwolf]

Also, coincidentally, I'll have an Ark GRiP catback for sale for $1300 if anyone is interested. It's in great condition, just slightly discolored as is normal after x amount of heat cycles.

 

[Kamauxx]

I mentioned to someone that the stock mid-pipes with aftermarket DPs and catback would probably be a good option for taming the sound a bit.

More ppl should probably try it out before running away or buying dynamat. Let it do what it's designed for--removing drone.

 

[Jwolf]

I mentioned to someone that the stock mid-pipes with aftermarket DPs and catback would probably be a good option for taming the sound a bit.

More ppl should probably try it out before running away or buying dynamat. Let it do what it's designed for--removing drone.

I agree it would help a lot, but I also don't think the dynomat hurt anything. I only used about 8 lbs worth. But also now that I've had this experience, I'm not sure why more aftermarket catbacks are not using midpipes similar to Kia's, just maybe with larger diameter piping and better resonators.

 

[Adamdan]

Alright guys latest update...

I picked up a set of Borla XR-1 race mufflers, part # Borla 40641, in the hopes that they were skinny enough to fit on the dps. Well, there is no chance. There is no possibility to alter the dps in any way as they are less than 1/2" from the heat shielding above them at the closest point.

So, as an experiment, I put the stock midpipe back on (midpipe from the cat back, not the downpipes). Omg the difference is crazy even with the aftermarket muffler. It's like the drone almost completely dissappeared except a very, very small amount around 70 mph under load. (Also the dynamat probably is doing domething here, don't forget I have that.)

So right now, instead of sitting on the world's most expensive axle back, my car is at the shop having a custom axle back created. I'm hoping to utilize the XR-1s since I have them, but am concerned about drone again. If it is bad, I will have additional resonators (vibrant ultra quiet) added to the custom axle back and see what that does.

Did changing the mid pipe help with the rasp?