Discovery on STi JDM axleback and perhaps others - Page 18 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Ernest72 · 08-09-2021, 12:36 PM

Quote:

Originally Posted by jflogerzi

Dump it for an axle back if you still have the stock mid pipe

Sent from my GM1915 using Tapatalk

Tried that and it was louder with a Borla axle back. I have mid pipe, what axle back is relatively quiet.

jflogerzi · 08-09-2021, 06:21 PM

Quote:

Originally Posted by Ernest72

Tried that and it was louder with a Borla axle back. I have mid pipe, what axle back is relatively quiet.

https://www.ftspeed.com/part/360-231...016-subaru-brz

Or a full MXP SP catback

worldwidewait · 08-23-2021, 10:41 AM

I just installed 4 of these STI hangers. It took away almost 80% of the drone.

I have a kakimoto regu 06&r and it had a horrible drone starting from 2K rpm right up to 4+k. Now the drone is almost eliminated.

I noticed that the front pipe is bolted to the chassis unlike the rear muffler. Has anyone retrofitted a rubber hanger here as well?

Calum · 08-23-2021, 10:58 AM

Quote:

Originally Posted by worldwidewait

I just installed 4 of these STI hangers. It took away almost 80% of the drone.

I have a kakimoto regu 06&r and it had a horrible drone starting from 2K rpm right up to 4+k. Now the drone is almost eliminated.

I noticed that the front pipe is bolted to the chassis unlike the rear muffler. Has anyone retrofitted a rubber hanger here as well?

Interesting question.

gpvecchi · 08-23-2021, 04:50 PM

Mmh, too high temperatures for rubber?

OT: @worldwidewait are you on catless headers?

worldwidewait · 08-24-2021, 04:55 AM

Quote:

Originally Posted by gpvecchi

Mmh, too high temperatures for rubber?

OT: @worldwidewait are you on catless headers?

Yes. On Tomei UELs. It would still drone on stock headers. These kakimotos are pretty notorious. Even with 2 helmholtz resonators at the back p

Compelica · 10-01-2021, 06:52 AM

Finally got to the spectrometer readings. Haven't done a full comparison yet but you can certainly see a 1-2 DB reduction at the lowest frequency peaks. I'll leave it to you guys to interpret the results.

Butt dyno wise on the road there is definitely less lower frequencies removed. In my setup it is the low frequencies which you can hear, not the frequencies you can feel. My setup does not have much drone or any, so to speak.

Setup is stock decatted header + stock overpipe + stock front pipe + Fujitsubo Authorize R catback. Mic used is a Boya BY-M1 (better than the stock phone mic at the very least).

Order of images is in 2K RPM, 3k, 4k, 5k, idle.

Before:
https://imgur.com/a/IRDlD5F
After:
https://imgur.com/a/SPBoV7q

A quote from a google link:

Quote:

The standard definition of a decibel indicates that it’s roughly the smallest amount of volume change that a person can subjectively perceive. That means variations of up to 1 dB ought to be pretty much imperceptible, while those at or beyond 1 dB are noticeable.

https://www.logison.com/blog-article...hange-isntgood

warhawk03 · 10-03-2021, 08:56 PM

I installed a Fujitsubo Authorize R cat-back and the Subaru JDM hangers and noticed that there's a lot of movement with these hangers compared to stock. I can move the exhaust back and forth pretty easily and bump into the diff. For street driving this may be okay, but I'm curious if autocross may make it more noticeable.

nikitopo · 10-04-2021, 01:19 AM

Quote:

Originally Posted by warhawk03

I installed a Fujitsubo Authorize R cat-back and the Subaru JDM hangers and noticed that there's a lot of movement with these hangers compared to stock. I can move the exhaust back and forth pretty easily and bump into the diff. For street driving this may be okay, but I'm curious if autocross may make it more noticeable.

Exactly. We pointed this topic some months ago. The original STi exhaust install spec was to change just the last 2 hangers. It would be easy for them to tell changing all of them, but I suppose they wanted to avoid the additional exhaust move.

kevaughan · 10-04-2021, 03:28 PM

Quote:

Originally Posted by warhawk03

I installed a Fujitsubo Authorize R cat-back and the Subaru JDM hangers and noticed that there's a lot of movement with these hangers compared to stock. I can move the exhaust back and forth pretty easily and bump into the diff. For street driving this may be okay, but I'm curious if autocross may make it more noticeable.

Thanks for the reminder. I might opt to just do the rear 2 hangers. As soon as these mounts arrive

Overdrive · 10-04-2021, 04:02 PM

Same thing here. I changed all of the hangers and noticed how much more movement there is from the system. I'll swap some of the originals back in and see if it cuts down on the movement.

warhawk03 · 10-04-2021, 08:27 PM

Quote:

Originally Posted by nikitopo

Exactly. We pointed this topic some months ago. The original STi exhaust install spec was to change just the last 2 hangers. It would be easy for them to tell changing all of them, but I suppose they wanted to avoid the additional exhaust move.

Sorry, I must've missed it earlier in the thread. Thanks for confirming.

matthui95 · 10-05-2021, 12:33 AM

Bit of a long shot but figured I'd ask since some of the guys here are from Toronto. Anyone wanna do a combined order, save on a bit of shipping for some hangers?

StraightOuttaCanadaEh · 10-05-2021, 05:13 PM

Quote:

Originally Posted by matthui95

Bit of a long shot but figured I'd ask since some of the guys here are from Toronto. Anyone wanna do a combined order, save on a bit of shipping for some hangers?

Missed me by a month or so! I ordered mine from blackhawkjapan and honestly wasn't too bad. Delivered fast and no duties

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08-23-2021, 10:41 AM	#241
worldwidewait Junior Member Join Date: May 2021 Drives: GT86 Location: Malaysia Posts: 2 Thanks: 0 Thanked 2 Times in 1 Post Mentioned: 1 Post(s) Tagged: 0 Thread(s)	I just installed 4 of these STI hangers. It took away almost 80% of the drone. I have a kakimoto regu 06&r and it had a horrible drone starting from 2K rpm right up to 4+k. Now the drone is almost eliminated. I noticed that the front pipe is bolted to the chassis unlike the rear muffler. Has anyone retrofitted a rubber hanger here as well?

08-23-2021, 04:50 PM	#243
gpvecchi Senior Member Join Date: Mar 2018 Drives: Toyota 86 GT Limited PP (Model G) Location: Italy Posts: 1,048 Thanks: 411 Thanked 355 Times in 199 Posts Mentioned: 14 Post(s) Tagged: 0 Thread(s)	Mmh, too high temperatures for rubber? OT: @worldwidewait are you on catless headers?

10-03-2021, 08:56 PM	#246
warhawk03 Member Join Date: Mar 2016 Drives: 2018 BRZ Location: Wisconsin Posts: 32 Thanks: 19 Thanked 9 Times in 7 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	I installed a Fujitsubo Authorize R cat-back and the Subaru JDM hangers and noticed that there's a lot of movement with these hangers compared to stock. I can move the exhaust back and forth pretty easily and bump into the diff. For street driving this may be okay, but I'm curious if autocross may make it more noticeable.

10-05-2021, 12:33 AM	#251
matthui95 Member Join Date: Oct 2013 Drives: 2018 CWP Subaru BRZ Sport-tech RS Location: Toronto Posts: 85 Thanks: 6 Thanked 20 Times in 16 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Bit of a long shot but figured I'd ask since some of the guys here are from Toronto. Anyone wanna do a combined order, save on a bit of shipping for some hangers?

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