Perrin exhaust resonance - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Leland · 03-15-2017, 03:36 PM

I have a Perrin 2.5" resonated exhaust and it is overall very good. I do, however get a low frequency resonance between around 2700 and 3200 rpms that is more intrusive than any other rpms. Is this experienced by others with the Perrin? I have no other exhaust modifications. Thank you for your thoughts.

wparsons · 03-15-2017, 03:47 PM

I find mine is most boomy around 2000-2500rpm, 2.5" resonated cat back and their 2.5" catted front pipe.

00NissanNinja · 03-15-2017, 07:58 PM

Quote:

Originally Posted by wparsons

I find mine is most boomy around 2000-2500rpm, 2.5" resonated cat back and their 2.5" catted front pipe.

+1

chaoskaze · 03-15-2017, 09:09 PM

It's like that for most of the exhaust I think

umpadupa · 03-15-2017, 11:13 PM

they are actually a really tame exhaust. if it bugs you, maybe try the HKS front pipe

Leland · 03-15-2017, 11:26 PM

...........one thing I forgot to mention, it seems to be intermittent. Meaning that most of the time it is insignificant. Other times less so. What would an HKS front pipe offer?

tyler_win_photo · 03-16-2017, 02:42 AM

Quote:

Originally Posted by Leland

...........one thing I forgot to mention, it seems to be intermittent. Meaning that most of the time it is insignificant. Other times less so. What would an HKS front pipe offer?

He's probably referring to the HKS front pipe with dual resonators. Although not guaranteed, it might help with that drone you're experiencing.

N1rve · 03-16-2017, 10:54 PM

Quote:

Originally Posted by Leland

I have a Perrin 2.5" resonated exhaust and it is overall very good. I do, however get a low frequency resonance between around 2700 and 3200 rpms that is more intrusive than any other rpms. Is this experienced by others with the Perrin? I have no other exhaust modifications. Thank you for your thoughts.

I have a Perrin 3" resonated. I get the resonance around 2500 RPM and causes my rear deck to buzz.

The solution I've found is to gas the car harder and keep the RPMS in the 3000 RPM range and it goes away. It's more apparent with the AC on for me. You can also turn on the music louder or crack a window to increase some background noise.

dys586 · 03-18-2017, 04:02 PM

Try checking if everything is tightened to spec. My friend and I both have Perrin 3", and his exhaust was a little louder/had resonance compared to mine until he retightened it.

finch1750 · 03-19-2017, 06:33 PM

It could be how much throttle is applied. I know mine seems more boomy when I am barely on throttle but still accelerating a bit and it is around the RPM range. More gas solves it

bfsnail · 03-19-2017, 06:41 PM

I used to have the same problem. I fixed it by getting a turbo and a nameless 3" catted and resonated front/over pipe. Maybe try that and see if it goes away?

Silver Cervy · 03-19-2017, 07:04 PM

Running a 2.5 with a JDL header and I only hear drone when I'm in cruise control on the highway. Otherwise it is very tame and does what I want it to do.

guybo · 03-19-2017, 08:47 PM

What is your header and overpipe? What did you use for gaskets?

Leland · 03-20-2017, 09:06 AM

Try checking if everything is tightened to spec. My friend and I both have Perrin 3", and his exhaust was a little louder/had resonance compared to mine until he retightened it.

I have tried adjusting and tightening things a couple of times. The vee bands had come slightly below original torque settings.
Because of the intermittent nature of the resonance this is most likely. And the interesting thing is since I started this post this there has been virtually no instance of the resonance. Perhaps it was struggling with the change of seasons and has settled again?

03-15-2017, 03:36 PM	#1
Leland Member Join Date: Mar 2016 Drives: BRZ JDL uel headers oft Perrin 2.5 Location: Albuquerque Posts: 28 Thanks: 0 Thanked 10 Times in 8 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Perrin exhaust resonance I have a Perrin 2.5" resonated exhaust and it is overall very good. I do, however get a low frequency resonance between around 2700 and 3200 rpms that is more intrusive than any other rpms. Is this experienced by others with the Perrin? I have no other exhaust modifications. Thank you for your thoughts.

03-19-2017, 06:33 PM	#10
finch1750 Undisputed El Presidente Join Date: Jun 2012 Drives: Zenki 37J ZN6 Location: Stockton, CA Posts: 11,571 Thanks: 9,382 Thanked 9,397 Times in 5,261 Posts Mentioned: 374 Post(s) Tagged: 33 Thread(s)	It could be how much throttle is applied. I know mine seems more boomy when I am barely on throttle but still accelerating a bit and it is around the RPM range. More gas solves it __________________ "Just like how a strut bar somehow enables you to corner 20MPH faster around a cloverleaf on-ramp, when the reality is, you can do it already but you just don't have to balls to do it." - CSG David

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03-15-2017, 09:09 PM	#4
chaoskaze The Fail Boat Join Date: Aug 2011 Drives: CWP S.B. Location: LasVegas Posts: 3,028 Thanks: 4,718 Thanked 1,293 Times in 873 Posts Mentioned: 19 Post(s) Tagged: 0 Thread(s)	It's like that for most of the exhaust I think

03-15-2017, 11:13 PM	#5
umpadupa Senior Member Join Date: Oct 2012 Drives: 94 civic hatch, Whiteout frs Location: VanCity Posts: 181 Thanks: 45 Thanked 77 Times in 43 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	they are actually a really tame exhaust. if it bugs you, maybe try the HKS front pipe

03-15-2017, 11:26 PM	#6
Leland Member Join Date: Mar 2016 Drives: BRZ JDL uel headers oft Perrin 2.5 Location: Albuquerque Posts: 28 Thanks: 0 Thanked 10 Times in 8 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	...........one thing I forgot to mention, it seems to be intermittent. Meaning that most of the time it is insignificant. Other times less so. What would an HKS front pipe offer?

03-18-2017, 04:02 PM	#9
dys586 Member Join Date: Mar 2015 Drives: 2013 Subaru BRZ Premium Location: California Posts: 27 Thanks: 4 Thanked 14 Times in 6 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Try checking if everything is tightened to spec. My friend and I both have Perrin 3", and his exhaust was a little louder/had resonance compared to mine until he retightened it.

03-19-2017, 06:41 PM	#11
bfsnail Senior Member Join Date: Mar 2013 Drives: 2013 FR-S Location: Omaha, NE Posts: 307 Thanks: 84 Thanked 128 Times in 68 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	I used to have the same problem. I fixed it by getting a turbo and a nameless 3" catted and resonated front/over pipe. Maybe try that and see if it goes away?

03-19-2017, 07:04 PM	#12
Silver Cervy Some really cool title Join Date: May 2016 Drives: 2014 Subaru BRZ Limited Location: Matthews, NC Posts: 343 Thanks: 39 Thanked 211 Times in 125 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Running a 2.5 with a JDL header and I only hear drone when I'm in cruise control on the highway. Otherwise it is very tame and does what I want it to do.

03-19-2017, 08:47 PM	#13
guybo Huge E85 fan! Join Date: May 2016 Drives: 2016 Scion FRS Location: Tampa, FL, USA Posts: 1,850 Thanks: 539 Thanked 1,010 Times in 605 Posts Mentioned: 32 Post(s) Tagged: 0 Thread(s)	What is your header and overpipe? What did you use for gaskets?

03-20-2017, 09:06 AM	#14
Leland Member Join Date: Mar 2016 Drives: BRZ JDL uel headers oft Perrin 2.5 Location: Albuquerque Posts: 28 Thanks: 0 Thanked 10 Times in 8 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Try checking if everything is tightened to spec. My friend and I both have Perrin 3", and his exhaust was a little louder/had resonance compared to mine until he retightened it. I have tried adjusting and tightening things a couple of times. The vee bands had come slightly below original torque settings. Because of the intermittent nature of the resonance this is most likely. And the interesting thing is since I started this post this there has been virtually no instance of the resonance. Perhaps it was struggling with the change of seasons and has settled again?

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