exhaust buzzing 3k to 4k input please! - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

ft86me · 03-24-2013, 12:28 AM

so have I have the ARK test pipe as well as catback exhaust and have an issue with the exhaust rattling around 3k to 4k when the throttle is pressed more than halfway, so kinda laying in on it. I have checked to see if the bolts were loose and there is no sign of anything being loose at all. I also checked the heat shield on the exhaust manifold and nothing is loose there. Mind you the test pipe does not have a heat shield so there can't be anything going on there. Since I do not have or know the torque specs for the exhaust, I tightened down everything pretty tight with an impact gun. I have noticed something though, which is condensation (not much) going from the test pipe to the catback where the donut gasket is. That portion I really tightened down in fear of it coming loose. Could this be the issue since there is not enough play in the system? Perhaps I over tightened that part of the exhaust? Any input would be great!!!

Note: mind you only in more than half throttle around 3l to 4k the noise happens otherwise it's gone. Otherwise if not on more than half throttle, the exhaust sounds perfectly fine without the noise.

mswhong · 03-24-2013, 01:19 AM

there shouldn't be any sort of leakage.. and given that you noticed some condensation at the donut gasket, it might possibly be the linkage between test-pipe and catback that's making the rattle sound.

Call/email ARK and see what their opinion is on it.

Sony · 03-24-2013, 01:22 AM

You very well could have overtightened something...the exhaust bolts only need to be tightened to 25 ft-lbs...tightening with an impact means they are probably closer to 125ft-lbs which could warp flanges.

Also check clearances around the transmission tunnel and those things, the Perrin had an issue where on some cars the resonator did not have enough clearance between the resonator and the trans tunnel and would hit the trans tunnel and make noise, easily fixed with a couple minor adjustments.

ft86me · 03-24-2013, 01:44 AM

Quote:

Originally Posted by Sony

You very well could have overtightened something...the exhaust bolts only need to be tightened to 25 ft-lbs...tightening with an impact means they are probably closer to 125ft-lbs which could warp flanges.

Also check clearances around the transmission tunnel and those things, the Perrin had an issue where on some cars the resonator did not have enough clearance between the resonator and the trans tunnel and would hit the trans tunnel and make noise, easily fixed with a couple minor adjustments.

i'll definitely check that out. thanks man appreciate the info. wow 25ft lbs. fml hahaha. perhaps too late. i'll put it in the air on monday and see what's going on at work. thanks again!

ft86me · 03-24-2013, 01:46 AM

Quote:

Originally Posted by Sony

You very well could have overtightened something...the exhaust bolts only need to be tightened to 25 ft-lbs...tightening with an impact means they are probably closer to 125ft-lbs which could warp flanges.

Also check clearances around the transmission tunnel and those things, the Perrin had an issue where on some cars the resonator did not have enough clearance between the resonator and the trans tunnel and would hit the trans tunnel and make noise, easily fixed with a couple minor adjustments.

actually there is plenty of room since the resonator is pretty small and i just looked and there is plenty of clearance for both test pipe and cat back. perhaps over tightened

jpit · 03-24-2013, 01:51 AM

What you may be hearing is rasp from the test pipe. That is a common problem. The torque spec for the donut gasket is just 15 lbs.

ft86me · 03-24-2013, 01:55 AM

Quote:

Originally Posted by jpit

What you may be hearing is rasp from the test pipe. That is a common problem. The torque spec for the donut gasket is just 15 lbs.

this is what i was assuming since that tends to happen and there is no cat on the test pipe

ft86me · 03-24-2013, 01:55 AM

Quote:

Originally Posted by jpit

What you may be hearing is rasp from the test pipe. That is a common problem. The torque spec for the donut gasket is just 15 lbs.

so 15ftlbs for the test pipe to the catback?

LeeMaster · 03-24-2013, 01:57 AM

I have this problem, the exhaust is hitting the crossmember right in the center of where the rear wheels are. The solution for me was slightly longer stiffer polyeutherane exhaust hangers.

ft86me · 03-24-2013, 01:59 AM

Quote:

Originally Posted by LeeMaster

I have this problem, the exhaust is hitting the crossmember right in the center of where the rear wheels are. The solution for me was stiffer polyeutherane exhaust hangers.

i can hear mine coming from the front for sure. it's like the front right. doesn't sound like a rattling on something and plus I have the exhaust hangers wrapped with clamps so they don't sag

jpit · 03-24-2013, 02:00 AM

Yes. I have the same problem with the condensation but haven't been able to completely stop it.

ft86me · 03-24-2013, 02:02 AM

Quote:

Originally Posted by jpit

Yes. I have the same problem with the condensation but haven't been able to completely stop it.

mine is SUPER minimal i mean not even enough for it to drip on the ground. i hit up ark with an email a few minutes ago so i'll find out what's going on next week. they are nearby me so if anything i can take it down there

03-24-2013, 12:28 AM	#1
ft86me Senior Member Join Date: Feb 2013 Drives: 2013 FRS Location: Endor Posts: 1,231 Thanks: 802 Thanked 349 Times in 212 Posts Mentioned: 60 Post(s) Tagged: 1 Thread(s)	exhaust buzzing 3k to 4k input please! so have I have the ARK test pipe as well as catback exhaust and have an issue with the exhaust rattling around 3k to 4k when the throttle is pressed more than halfway, so kinda laying in on it. I have checked to see if the bolts were loose and there is no sign of anything being loose at all. I also checked the heat shield on the exhaust manifold and nothing is loose there. Mind you the test pipe does not have a heat shield so there can't be anything going on there. Since I do not have or know the torque specs for the exhaust, I tightened down everything pretty tight with an impact gun. I have noticed something though, which is condensation (not much) going from the test pipe to the catback where the donut gasket is. That portion I really tightened down in fear of it coming loose. Could this be the issue since there is not enough play in the system? Perhaps I over tightened that part of the exhaust? Any input would be great!!! Note: mind you only in more than half throttle around 3l to 4k the noise happens otherwise it's gone. Otherwise if not on more than half throttle, the exhaust sounds perfectly fine without the noise. Last edited by ft86me; 03-24-2013 at 12:41 AM.

03-24-2013, 01:22 AM	#3
Sony Senior Member Join Date: Jul 2011 Drives: 2013 Subaru BRZ MT Limited Location: Somerville, MA Posts: 805 Thanks: 20 Thanked 463 Times in 200 Posts Mentioned: 25 Post(s) Tagged: 0 Thread(s)	You very well could have overtightened something...the exhaust bolts only need to be tightened to 25 ft-lbs...tightening with an impact means they are probably closer to 125ft-lbs which could warp flanges. Also check clearances around the transmission tunnel and those things, the Perrin had an issue where on some cars the resonator did not have enough clearance between the resonator and the trans tunnel and would hit the trans tunnel and make noise, easily fixed with a couple minor adjustments. __________________ Dark Blue 2020 Subaru Forester Sport, Name: Apollo - God of Music WRB 2013 Subaru BRZ Limited MT, Name: Zeus - Father of all God's and God of Sky and Thunder Perrin Cat-Back, ECUTek Tune by Kaizen Tuning, Perrin Silicone Radiator Hoses, Perrin Master Cylinder Brace, Perrin True Cold Air Intake

03-24-2013, 01:57 AM	#9
LeeMaster Red wine Join Date: Oct 2012 Drives: Subaru BRZ(R.I.P) Location: Denied Posts: 1,176 Thanks: 1,268 Thanked 342 Times in 240 Posts Mentioned: 13 Post(s) Tagged: 0 Thread(s)	I have this problem, the exhaust is hitting the crossmember right in the center of where the rear wheels are. The solution for me was slightly longer stiffer polyeutherane exhaust hangers. __________________

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03-24-2013, 01:19 AM	#2
mswhong Senior Member Join Date: Oct 2012 Drives: FT86 Location: AUS Posts: 253 Thanks: 83 Thanked 64 Times in 45 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	there shouldn't be any sort of leakage.. and given that you noticed some condensation at the donut gasket, it might possibly be the linkage between test-pipe and catback that's making the rattle sound. Call/email ARK and see what their opinion is on it.

03-24-2013, 01:51 AM	#6
jpit Senior Member Join Date: Jun 2012 Drives: Subaru BRZ Location: Port Angeles, WA Posts: 338 Thanks: 24 Thanked 234 Times in 86 Posts Mentioned: 22 Post(s) Tagged: 1 Thread(s)	What you may be hearing is rasp from the test pipe. That is a common problem. The torque spec for the donut gasket is just 15 lbs.

03-24-2013, 02:00 AM	#11
jpit Senior Member Join Date: Jun 2012 Drives: Subaru BRZ Location: Port Angeles, WA Posts: 338 Thanks: 24 Thanked 234 Times in 86 Posts Mentioned: 22 Post(s) Tagged: 1 Thread(s)	Yes. I have the same problem with the condensation but haven't been able to completely stop it.

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