Melted off exhaust hangers... - Page 2 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

waterpanda · 06-29-2022, 10:50 AM

Heard back from Perrin - they reckon it's the diffuser obstructing airflow + muffler placement + high EGTs.

In any case, they were kind enough to ship out free replacements.

Next track event is NASA @ Lime Rock Park - Jul 8-9, going to try heat-wrapping the muffler as well as try doing the same as what the guy did with his Focus (wrap the hangers themselves in heatwrap and apply steel band around it). Bringing extra hangers just in case and check them after every session. Will report back

Ohio Enthusiast · 06-29-2022, 11:02 AM

Quote:

Originally Posted by waterpanda

wrap the hangers themselves in heatwrap and apply steel band around it

This sounds like the best solution to me. The reduced airflow means you probably can't do anything with convective heat (as the air in the cavity will get hot no matter how much you insulate the exhaust), but you can fight radiative heat by foil shielding the hangers.

DocWalt · 06-29-2022, 01:04 PM

I remember reading a post about a guy developing underbody aero for his car and he kept melting poly hangers so he went back to rubber hangers.

The poly hangers are the likely issue.

I *think* it was this thread: https://www.1addicts.com/forums/show....php?t=1713247

edit: it was indeed that thread, see the post here https://www.1addicts.com/forums/show...0&postcount=67

waterpanda · 06-29-2022, 01:29 PM

Quote:

Originally Posted by DocWalt

I remember reading a post about a guy developing underbody aero for his car and he kept melting poly hangers so he went back to rubber hangers.

The poly hangers are the likely issue.

I *think* it was this thread: https://www.1addicts.com/forums/show....php?t=1713247

This is super insightful, thanks for sharing. I actually have the rubber OE mounts on right now, going to give the rubber ones a try with the above-mentioned mod.

Matt93SE · 06-30-2022, 12:38 PM

Cheat code: if the factory rubber hangers aren't quite stiff enough to hold everything in place, I've used cheap metal hose clamps around the hanger to limit the stretch of the rubber.
see if this random interweb photo link works:

waterpanda · 07-04-2022, 07:24 PM

Reinforced rubber bushings are on the car now - gonna see how it holds up this week at LRP!

Ultramaroon · 07-04-2022, 07:34 PM

I suggest, instead of zip tie, a smidge of safety wire or a little improvised clip made from a piece of coat hanger. Dunno, maybe the zip tie will hold up. Good stuff!

waterpanda · 07-08-2022, 05:06 PM

Update: Great day at LRP today with NASA, both hangers holding up nicely after 4 sessions, no signs of deterioration so happy about that

06-29-2022, 10:50 AM	#15
waterpanda Member Join Date: Jun 2021 Drives: 2013 BRZ Location: NJ Posts: 26 Thanks: 11 Thanked 11 Times in 4 Posts Mentioned: 0 Post(s)	Heard back from Perrin - they reckon it's the diffuser obstructing airflow + muffler placement + high EGTs. In any case, they were kind enough to ship out free replacements. Next track event is NASA @ Lime Rock Park - Jul 8-9, going to try heat-wrapping the muffler as well as try doing the same as what the guy did with his Focus (wrap the hangers themselves in heatwrap and apply steel band around it). Bringing extra hangers just in case and check them after every session. Will report back Last edited by waterpanda; 06-29-2022 at 11:06 AM.

06-29-2022, 01:04 PM	#17
DocWalt Senior Member Join Date: Oct 2013 Drives: '22 BRZ Location: PA Posts: 1,958 Thanks: 2,437 Thanked 1,687 Times in 852 Posts Mentioned: 25 Post(s)	I remember reading a post about a guy developing underbody aero for his car and he kept melting poly hangers so he went back to rubber hangers. The poly hangers are the likely issue. I think it was this thread: https://www.1addicts.com/forums/show....php?t=1713247 edit: it was indeed that thread, see the post here https://www.1addicts.com/forums/show...0&postcount=67 __________________ - Ken. H DocWalt's WRB 2013 BRZ Build Thread \| DocWalt's 2022 WRB BRZ Build Thread Last edited by DocWalt; 06-29-2022 at 01:32 PM.

07-04-2022, 07:24 PM	#20
waterpanda Member Join Date: Jun 2021 Drives: 2013 BRZ Location: NJ Posts: 26 Thanks: 11 Thanked 11 Times in 4 Posts Mentioned: 0 Post(s)	Reinforced rubber bushings are on the car now - gonna see how it holds up this week at LRP! Attached Images

07-04-2022, 07:34 PM	#21
Ultramaroon not playing cards Join Date: Sep 2014 Drives: a 13 e8h frs Location: vantucky, wa Posts: 32,392 Thanks: 53,053 Thanked 37,228 Times in 19,308 Posts Mentioned: 1118 Post(s)	I suggest, instead of zip tie, a smidge of safety wire or a little improvised clip made from a piece of coat hanger. Dunno, maybe the zip tie will hold up. Good stuff! __________________ service manuals

07-08-2022, 05:06 PM	#22
waterpanda Member Join Date: Jun 2021 Drives: 2013 BRZ Location: NJ Posts: 26 Thanks: 11 Thanked 11 Times in 4 Posts Mentioned: 0 Post(s)	Update: Great day at LRP today with NASA, both hangers holding up nicely after 4 sessions, no signs of deterioration so happy about that Attached Images

06-30-2022, 12:38 PM	#19
Matt93SE Senior Member Join Date: Sep 2020 Drives: 2013 FR-S, 2017 BRZ Location: Houston-ish Posts: 115 Thanks: 21 Thanked 108 Times in 59 Posts Mentioned: 2 Post(s)	Cheat code: if the factory rubber hangers aren't quite stiff enough to hold everything in place, I've used cheap metal hose clamps around the hanger to limit the stretch of the rubber. see if this random interweb photo link works:

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