Deep rattle/vibration in 1900-2500 RPM Band - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Sh1FTy · 06-26-2016, 07:32 PM

Hi guys,

The exhaust setup at the moment is PSR UEL Headers and Overpipe with a Berk HFC Front Pipe. Previously with just the PSR UEL Headers and Overpipe I had no issues. After I had installed the front pipe I've been getting some sort of deep rattle/vibration from behind me, kinda like a reverberating trombone noise between 1900-2500 RPM. It becomes very apparent from 1900 RPM and slowly dies down from 2500 RPM onwards.

I will be checking under the car over the next few days to check if everything's been installed and tightened correctly but are there any theories on what it could be?

Spartarus · 06-26-2016, 08:03 PM

I'd bet money on overpipe hitting/rubbing crossmember.

I know it sounds like it's coming from behind you... That's interesting. Doesn't fit the problem...

All speculation is meaningless until someone gets under there and checks for contact.

I almost guarantee this issue is a clearance issue.

Teseo · 06-26-2016, 08:31 PM

Looks identical of tomei/gruppe s

Wayno · 06-26-2016, 09:05 PM

You removed the heimholtz in the stock fp that's tuned for this exact rev range.
Is it vibration or is it valve overlap noise? They're two entirely different problems.

Sh1FTy · 06-26-2016, 10:18 PM

Quote:

Originally Posted by Wayno

You removed the heimholtz in the stock fp that's tuned for this exact rev range.
Is it vibration or is it valve overlap noise? They're two entirely different problems.

It's definitely a vibration/deep rattle sound.

dtrop · 06-26-2016, 11:37 PM

While this may not be the issue for you, it was with me.

I installed a JDL uel header and a quarter sized section was in contact with the skid plate. I took the skid plate off and banged it with a hammer and now I have no issues.

Sh1FTy · 06-26-2016, 11:58 PM

Quote:

Originally Posted by dtrop

While this may not be the issue for you, it was with me.

I installed a JDL uel header and a quarter sized section was in contact with the skid plate. I took the skid plate off and banged it with a hammer and now I have no issues.

Was your issue with a specific RPM band as well or across the board?

dtrop · 06-27-2016, 12:02 AM

Quote:

Originally Posted by Sh1FTy

Was your issue with a specific RPM band as well or across the board?

Somewhat, yes.

sound captured at 0:03-0:08 seconds

humfrz · 06-27-2016, 12:58 AM

Quote:

Originally Posted by Spartarus

I'd bet money on overpipe hitting/rubbing crossmember.

I know it sounds like it's coming from behind you... That's interesting. Doesn't fit the problem...

All speculation is meaningless until someone gets under there and checks for contact.

I almost guarantee this issue is a clearance issue.

Yep, I agree.

Another job for a crowbar and bailing wire ........

humfrz

Sh1FTy · 07-11-2016, 12:20 AM

I swapped out my stock catback for a Blitz Nur Spec C-Ti catback on the weekend and the rattle is now gone. Perhaps it was just a resonance issue with the stock catback?

06-26-2016, 07:32 PM	#1
Sh1FTy Member Join Date: Jul 2014 Drives: Toyota 86 Pegasus White Location: Sydney Posts: 47 Thanks: 1 Thanked 9 Times in 5 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Deep rattle/vibration in 1900-2500 RPM Band Hi guys, The exhaust setup at the moment is PSR UEL Headers and Overpipe with a Berk HFC Front Pipe. Previously with just the PSR UEL Headers and Overpipe I had no issues. After I had installed the front pipe I've been getting some sort of deep rattle/vibration from behind me, kinda like a reverberating trombone noise between 1900-2500 RPM. It becomes very apparent from 1900 RPM and slowly dies down from 2500 RPM onwards. I will be checking under the car over the next few days to check if everything's been installed and tightened correctly but are there any theories on what it could be?

06-26-2016, 08:03 PM	#2
Spartarus ...Just add nauseum Join Date: Jan 2015 Drives: 2003 (AP1) S2000 Location: Miami, FL Posts: 546 Thanks: 310 Thanked 785 Times in 335 Posts Mentioned: 19 Post(s) Tagged: 1 Thread(s)	I'd bet money on overpipe hitting/rubbing crossmember. I know it sounds like it's coming from behind you... That's interesting. Doesn't fit the problem... All speculation is meaningless until someone gets under there and checks for contact. I almost guarantee this issue is a clearance issue. __________________ There are many ways to displace. -Spartarus

06-26-2016, 09:05 PM	#4
Wayno Senior Member Join Date: Apr 2014 Drives: Toyota 86 GTS Location: Australia Posts: 1,129 Thanks: 453 Thanked 896 Times in 424 Posts Mentioned: 211 Post(s) Tagged: 0 Thread(s)	You removed the heimholtz in the stock fp that's tuned for this exact rev range. Is it vibration or is it valve overlap noise? They're two entirely different problems. __________________ rom downloads, information and examples Toyota 86 GTS OFT - Guide To Dialling In OTS Base Tune OFT - Example Alternate Maps for AT, 98RON, E85, MAF Scales

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06-26-2016, 08:31 PM	#3
Teseo Senior Member Join Date: Jun 2014 Drives: frs Location: Gunsai Posts: 4,951 Thanks: 7,463 Thanked 2,978 Times in 1,801 Posts Mentioned: 23 Post(s) Tagged: 2 Thread(s)	Looks identical of tomei/gruppe s

06-26-2016, 11:37 PM	#6
dtrop Senior Member Join Date: Jun 2012 Drives: Wrb 2014 limited brZ Location: United States Posts: 436 Thanks: 5 Thanked 185 Times in 103 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	While this may not be the issue for you, it was with me. I installed a JDL uel header and a quarter sized section was in contact with the skid plate. I took the skid plate off and banged it with a hammer and now I have no issues.

07-11-2016, 12:20 AM	#10
Sh1FTy Member Join Date: Jul 2014 Drives: Toyota 86 Pegasus White Location: Sydney Posts: 47 Thanks: 1 Thanked 9 Times in 5 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I swapped out my stock catback for a Blitz Nur Spec C-Ti catback on the weekend and the rattle is now gone. Perhaps it was just a resonance issue with the stock catback?

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