Quest To Reduce Single Exit Noise Levels
10-17-2013, 02:56 PM
#26
FWIW, 2 weeks with this installed and so far so good. And I have been beating on it quite a bit to get tuned. No increase in noise, no rattling, etc. Will keep posted on significant milestones (1 month, 6 month, etc) just incase it entices anyone to consider it.
10-18-2013, 11:54 AM
#28
my other car is a 787b
I hope the lighter single pipe offsets the drop in horsepower. Subscribed. Interested to hear the long term results. I want to make the jump to a single but the noise limits in my area are strictly enforced.
Last edited by Ianspeed; 10-18-2013 at 11:55 AM. Reason: Grammar and lack of coffee.
12-16-2013, 11:54 AM
#30
Update for those still interested:
Been about 2 months now since I installed the auger insert, and things are still looking good!
Mind you that I haven't been babying this car either as I have been doing some tuning so the car has had plenty of time of sustained RPM driving even at 8000rpm.
The car is still quiet, no strange things that have happened, no performance issues, no sluggish feel.
The only "issue" that I can mention is that now that it is really cold out (if the car sits outside at work when it is like 18F here) i can hear a tiny rattling. This is probably because one of the auger blades is rattling against he exhaust pipe on the inside. The noise goes away after a minute or so once the exhaust system starts heating up.
Been about 2 months now since I installed the auger insert, and things are still looking good!
Mind you that I haven't been babying this car either as I have been doing some tuning so the car has had plenty of time of sustained RPM driving even at 8000rpm.
The car is still quiet, no strange things that have happened, no performance issues, no sluggish feel.
The only "issue" that I can mention is that now that it is really cold out (if the car sits outside at work when it is like 18F here) i can hear a tiny rattling. This is probably because one of the auger blades is rattling against he exhaust pipe on the inside. The noise goes away after a minute or so once the exhaust system starts heating up.
12-17-2013, 11:08 AM
#31
This was the same issue I discovered when I used the Moroso mufflers in my first seven midpipes, and why I now use units produced by the guy who actually holds the patent on the design. Other companies use thinner steel and spot welds which tend to fall apart after a while when used on the Renesis.
As long as I dont go and start shooting out auger blades out of my exhaust i'll be happy lol.
And just to reconfirm for those who are just reading about this for the first time... this isn't an alternative for a quality midpipe, but a low cost solution for those who are dealing with a loud cat-back and are considering welding in an additional resonator.
12-18-2013, 01:52 AM
#32
Registered
Paimon did you start out with the bhr midpipe or did you have another one before that? Did you get any buzzing or much louder exhaust noise around 3.5-4.5k rpm with the bhr pipe, prior to installing all the stuff here? Also you went with the race roots single right?
I really don't mind how loud my exhaust is except between 3.5-4.5k because I spend so much time there in city driving. As I said in the other thread I am thinking of replacing one of my AP resonators with a bhr one and your answers to the above questions should help me know if it is worth my time.
I really don't mind how loud my exhaust is except between 3.5-4.5k because I spend so much time there in city driving. As I said in the other thread I am thinking of replacing one of my AP resonators with a bhr one and your answers to the above questions should help me know if it is worth my time.
12-18-2013, 08:02 AM
#33
Paimon did you start out with the bhr midpipe or did you have another one before that? Did you get any buzzing or much louder exhaust noise around 3.5-4.5k rpm with the bhr pipe, prior to installing all the stuff here? Also you went with the race roots single right?
I really don't mind how loud my exhaust is except between 3.5-4.5k because I spend so much time there in city driving. As I said in the other thread I am thinking of replacing one of my AP resonators with a bhr one and your answers to the above questions should help me know if it is worth my time.
I really don't mind how loud my exhaust is except between 3.5-4.5k because I spend so much time there in city driving. As I said in the other thread I am thinking of replacing one of my AP resonators with a bhr one and your answers to the above questions should help me know if it is worth my time.
What you are experiencing is probably the metal pinging that is characteristic of some straight through resonators (which i believe the AP has).
And yes, I have the RR single exit.
Lol very true ... hopefully no one is behind me though should it happen or they iwll be going home with a souvenir
12-18-2013, 02:16 PM
#34
Registered
Yeah it is a straight through resonator. I knew when I bought it that it was one of the cheaper options and it has sounded like that from day one. It might have gotten worse over time but I really couldn't tell. I had a hard time getting my midpipe to seal at the header>midpipe spot I had to go buy one of those carbon crush gaskets from race roots because nothing else would seal properly.
07-12-2014, 09:39 PM
#41
rev it up
It will be interesting to see a before and after dyno on this product. I looked into it a few years ago however I was not convinced at the time.
However, it sounds encouraging from what I am reading here.
I have heard of a really loud car dampened with J pipe/ side resonators. It uses the same principles as a resonance chamber installed in our intake system. This noise cancelling method has zero restrictions.
However, it sounds encouraging from what I am reading here.
I have heard of a really loud car dampened with J pipe/ side resonators. It uses the same principles as a resonance chamber installed in our intake system. This noise cancelling method has zero restrictions.
07-12-2014, 10:19 PM
#42
Yep, J pipe configurations are rather common for the 350/370 guys. Actually the Fujitsubo exhaust (or the obx knockoff version) uses a J pipe as well. Haven't heard a rotary up close with one.
As far as dyno goes, I would like to see the results too (unfortunately I just dont have the definitive need right now to dyno the car), but as far as 'seat of the pants' feel goes, i'd really have to say I 'feel' no loss. Harlan keep me honest here if you felt otherwise.
As far as dyno goes, I would like to see the results too (unfortunately I just dont have the definitive need right now to dyno the car), but as far as 'seat of the pants' feel goes, i'd really have to say I 'feel' no loss. Harlan keep me honest here if you felt otherwise.
06-08-2015, 01:09 PM
#45
Totally missed this question. Still holding up, not a single problem after 2 seasons of autocross, and generally driving the car the way its meant to be driven.
The only "thing" i have noticed is some discoloration at the last bend of the exhaust, but that makes sense as the slight restriction along with the bend traps a bit more heat than normal. I'll have to take a picture to show so that we can compare to others who have a HKS/RR style single exit.
The only "thing" i have noticed is some discoloration at the last bend of the exhaust, but that makes sense as the slight restriction along with the bend traps a bit more heat than normal. I'll have to take a picture to show so that we can compare to others who have a HKS/RR style single exit.
06-08-2015, 08:56 PM
#46
Registered
Totally missed this question. Still holding up, not a single problem after 2 seasons of autocross, and generally driving the car the way its meant to be driven.
The only "thing" i have noticed is some discoloration at the last bend of the exhaust, but that makes sense as the slight restriction along with the bend traps a bit more heat than normal. I'll have to take a picture to show so that we can compare to others who have a HKS/RR style single exit.
The only "thing" i have noticed is some discoloration at the last bend of the exhaust, but that makes sense as the slight restriction along with the bend traps a bit more heat than normal. I'll have to take a picture to show so that we can compare to others who have a HKS/RR style single exit.
11-03-2015, 10:20 AM
#49
Thanks for this one. I ended up with a turbo XS. And, they no longer have silencers for it. I had an incredibly loud span from about 1,800 to 2,400 RPM. I do a lot of 40 mph cruising at this speed. It was really bad, like shake windows bad.
I bought one of the augers from summit, trimmed the pipe ends, and installed it. The bad range went away, most of the drone is gone, car runs find, did not seem to hurt performance. With eh XS over stock, I got a lot of low end power. Like drive around in 6th gear at 25 mph low end power. Installing this did not change that.
Install procedure:
In a straight piece of pipe, see if it fits. If it does, you win.
If not, look and see if there is an inside seam bead in the exhaust pipe. If there is, notch the spirals to allow for it. This will save in trimming. Does it fit now?
If not, a grinder is your friend. put first coil in pipe, see if you can straighten it to install the second spiral. If not, you need to grind some of the first spiral. Wiggle it. The pivot points that it wiggles around are the high points, grind them a bit and try again. Repeat.
Once I got the second one lined up, the rest of it went in easily. I tapped it in with a board.
again, highly recommended.
I bought one of the augers from summit, trimmed the pipe ends, and installed it. The bad range went away, most of the drone is gone, car runs find, did not seem to hurt performance. With eh XS over stock, I got a lot of low end power. Like drive around in 6th gear at 25 mph low end power. Installing this did not change that.
Install procedure:
In a straight piece of pipe, see if it fits. If it does, you win.
If not, look and see if there is an inside seam bead in the exhaust pipe. If there is, notch the spirals to allow for it. This will save in trimming. Does it fit now?
If not, a grinder is your friend. put first coil in pipe, see if you can straighten it to install the second spiral. If not, you need to grind some of the first spiral. Wiggle it. The pivot points that it wiggles around are the high points, grind them a bit and try again. Repeat.
Once I got the second one lined up, the rest of it went in easily. I tapped it in with a board.
again, highly recommended.