Reducing Rasp - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Admired · 10-11-2013, 12:38 PM

Is there a way to reduce rasp without taking away from the loudness of the system? Drone for me isn't that annoying but raspyness when accelerating is annoying and sounds like a fart can sometimes. My current setup is Revworks UEL, Perrin Overpipe, Invidia Catless FP, and Berk Dual Muffler Delete. I know this is an abnoxious setup right now but I like it minus the rasp. So what Im asking is what would reduce rasp the most? I was thinking about a 14" Magnaflow resonator in the muffler delete or getting a catted front pipe. What would reduce rasp the most but keep the same sound volume?

Thanks for your help

m.wood0213 · 10-11-2013, 12:41 PM

either should do the trick.

FastLane1000 · 10-11-2013, 12:42 PM

keeping the same sound volume would probably be a front pipe with a hemholtz resonator. any resonator in the front pipe would help but a regular resonator would reduce sound volume as well. You could also try an exhaust weight like what comes stock on some vehicles exhaust systems. google exhaust mass damper or resonance mass damper for more info and pictures of these. Also wrapping the header should help noticeably but not completely.

FR-S Matt · 10-11-2013, 12:55 PM

Add 2-3 resonators to the system, one in the front pipe, one mid, and even one in the catback portion. They don't have to be very large ones.

Admired · 10-11-2013, 12:56 PM

Quote:

Originally Posted by FR-S Matt

Add 2-3 resonators to the system, one in the front pipe, one mid, and even one in the catback portion. They don't have to be very large ones.

Isn't that a little overkill? Won't one be fine?

FR-S Matt · 10-11-2013, 12:57 PM

Quote:

Originally Posted by Admired

Isn't that a little overkill? Won't one be fine?

You won't know till you add one. With a muffler delete and everything catless, probably not.

FastLane1000 · 10-11-2013, 12:59 PM

Quote:

Originally Posted by FR-S Matt

You won't know till you add one. With a muffler delete and everything catless, probably not.

+1

FR-S Matt · 10-11-2013, 12:59 PM

Quote:

Originally Posted by Admired

Isn't that a little overkill? Won't one be fine?

I have two resonators, a catted DP/OP and the stock header and my 3" exhaust is pretty damn loud still, but not raspy. I'll be adding a catless header soon and I still expect there to not be any rasp. My two resonators are about 15 inches long.

I think you will need at least two.

zc06_kisstherain · 10-11-2013, 12:59 PM

header is catless?

BRAWL · 10-11-2013, 01:01 PM

Get a catted front pipe and see if that helps. After that look at more resonators

Admired · 10-11-2013, 01:05 PM

Quote:

Originally Posted by zc06_kisstherain

header is catless?

Yes, catless revworks uel. I am thinking about for now just a 14" resonator on the catback portion and I will go from there.

Hardrock4445 · 10-11-2013, 01:51 PM

It's an FA20, unless turbo I haven't heard one that isn't raspy yet....

Admired · 10-11-2013, 04:36 PM

Quote:

Originally Posted by Hardrock4445

It's an FA20, unless turbo I haven't heard one that isn't raspy yet....

Going turbo reduces rasp? Because it diverts alot of the exhaust gas to the turbo?? I was planning on the P-tuning turbo when it comes out anyway/

FR-S Matt · 10-11-2013, 04:40 PM

Quote:

Originally Posted by Admired

Going turbo reduces rasp? Because it diverts alot of the exhaust gas to the turbo?? I was planning on the P-tuning turbo when it comes out anyway/

Turbo muffles exhaust really well. That's why 3" exhaust users are much quieter when the turbo is present.

10-11-2013, 12:38 PM	#1
Admired Senior Member Join Date: May 2013 Drives: 2013 Scion FRS Location: GA Posts: 248 Thanks: 0 Thanked 16 Times in 13 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Reducing Rasp Is there a way to reduce rasp without taking away from the loudness of the system? Drone for me isn't that annoying but raspyness when accelerating is annoying and sounds like a fart can sometimes. My current setup is Revworks UEL, Perrin Overpipe, Invidia Catless FP, and Berk Dual Muffler Delete. I know this is an abnoxious setup right now but I like it minus the rasp. So what Im asking is what would reduce rasp the most? I was thinking about a 14" Magnaflow resonator in the muffler delete or getting a catted front pipe. What would reduce rasp the most but keep the same sound volume? Thanks for your help

10-11-2013, 12:42 PM	#3
FastLane1000 Senior Member Join Date: Sep 2012 Drives: White FR-S, 6M Location: East Tennessee Posts: 272 Thanks: 70 Thanked 92 Times in 53 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	keeping the same sound volume would probably be a front pipe with a hemholtz resonator. any resonator in the front pipe would help but a regular resonator would reduce sound volume as well. You could also try an exhaust weight like what comes stock on some vehicles exhaust systems. google exhaust mass damper or resonance mass damper for more info and pictures of these. Also wrapping the header should help noticeably but not completely. __________________ http://www.ft86club.com/forums/showthread.php?t=30038

10-11-2013, 01:51 PM	#12
Hardrock4445 Senior Member Join Date: Aug 2012 Drives: 2013 Scion FR-S Location: Syracuse Posts: 719 Thanks: 274 Thanked 277 Times in 161 Posts Mentioned: 6 Post(s) Tagged: 0 Thread(s)	It's an FA20, unless turbo I haven't heard one that isn't raspy yet.... __________________ Mods: Perrin CAI, JDL EL header, DC sports Catless front pipe, top speed auto pro-1 cat-back, H&R sport line springs, Headlight blackout, "Demon eyes"

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10-11-2013, 01:01 PM	#10
BRAWL Senior Member Join Date: Jul 2012 Drives: Toyota 86 GTS Velocity Orange Location: Perth, Australia Posts: 447 Thanks: 74 Thanked 102 Times in 64 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	Get a catted front pipe and see if that helps. After that look at more resonators

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