Reducing Rasp - Page 2 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

zc06_kisstherain · 10-11-2013, 03:45 PM

I have Motiv Front pipe (catless) and Nameless axleback.
It doesn't rasp but drones a bit but not bad.
I believe usually whole bolts-on had catless, shouldnt rasp or drones. maybe i was wrong and this car is different than other cars.
keep us updated what you changed. i might get a header and dont want crazy rasp

wparsons · 10-11-2013, 04:04 PM

Quote:

Originally Posted by Hardrock4445

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

There's lots that aren't raspy...

[ame="https://www.youtube.com/watch?v=WpavxOvyclc"]BRZ Drive By PERRIN Cat Back Exhaust & Front Pipe - YouTube[/ame]

djliquidsteele · 10-11-2013, 09:18 PM

can someone please define raspy for me?

If this: [ame="http://www.youtube.com/watch?v=Y18bo5IYE50"]86 TRD Griffon Concept 2nd test - YouTube[/ame] is raspy, then god damn me, I love it!!!

mad_sb · 10-11-2013, 09:54 PM

Quote:

Originally Posted by FastLane1000

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.

As someone who is running an FA20 cattled 4-1 header, nameless catted helmholtz frontpipe, and custom ft86 speedfactory V2 with varex muffler, i can tell you helmholtz does not eliminate rasp. My setup is too raspy for my taste even with 2 cats. I think LONG resonators are the key to reducing rasp.

OP, have you looked at the hks dual resonated front pipe? I assume you have the resonated Invidia front pipe?

Admired · 10-11-2013, 09:56 PM

Quote:

Originally Posted by mad_sb

As someone who is running an FA20 cattled 4-1 header, nameless catted helmholtz frontpipe, and custom ft86 speedfactory V2 with varex muffler, i can tell you helmholtz does not eliminate rasp. My setup is too raspy for my taste even with 2 cats. I think LONG resonators are the key to reducing rasp.

OP, have you looked at the hks dual resonated front pipe? I assume you have the resonated Invidia front pipe?

I am completely catless at the moment. Headers and front pipe. I am considering putting in a 14" magnaflow muffler in the midpipe leading to the muffler delete

wparsons · 10-11-2013, 11:08 PM

The farty noise in this is rasp:

[ame="http://www.youtube.com/watch?v=60Y9fRTidiI"]Exhaust raspy

- YouTube[/ame]

[ame="http://www.youtube.com/watch?v=ZBdQZjRjzps"]Raspy ass Civic - YouTube[/ame]

Admired · 10-12-2013, 04:54 PM

So i think I will sell my berk muffler delete or install a muffler on the midpipe or get a Invidia N1 catback. How would the N1 sound vs. the berk muffler delete everything else being constant (same uel headers, catless fp, overpipe)

kuhlka · 10-12-2013, 11:31 PM

The least raspy/tinny/farty muffler I've heard so far has been the Perrin resonated catback. Everything else tends to sound high pitched, tinny (metallic tinging), or has that farty bark. I've got the Rev Works UEL in and it sounds great with the stock exhaust. I just need the full Perrin headerback, now.

Admired · 10-13-2013, 12:01 AM

Quote:

Originally Posted by kuhlka

The least raspy/tinny/farty muffler I've heard so far has been the Perrin resonated catback. Everything else tends to sound high pitched, tinny (metallic tinging), or has that farty bark. I've got the Rev Works UEL in and it sounds great with the stock exhaust. I just need the full Perrin headerback, now.

Thats funny because im currently selling my 2.5" perrin catback. Check out the members section

Kelbyat07 · 10-13-2013, 12:20 AM

Quote:

Originally Posted by Admired

So i think I will sell my berk muffler delete or install a muffler on the midpipe or get a Invidia N1 catback. How would the N1 sound vs. the berk muffler delete everything else being constant (same uel headers, catless fp, overpipe)

Well the N1 is not loud compared to the berk muffler delete, so I am pretty sure the rasp will reduce by a lot.

wparsons · 10-13-2013, 09:47 AM

Noise and rasp aren't the same thing, you can have a LOUD not raspy exhaust or a quieter but raspy exhaust. Typically the loud ones are raspy though.

stevo_12v · 01-21-2014, 05:47 AM

I tried heatwrap and some hoseclamps a couple of days ago to stop the thin stainless steel pipe on my CBE from vibrating so much(causing the rapsy sound). Quite a noticeable difference. I'll be getting some more heatwrap to wrap near the muffler and a bit further up the CBE.
I would not try this with a NON stainless steel exhaust btw.

TIP: You can also get DEI stainless steel zip ties to secure the heat wrap, don't bother. Cheaper and easier to get/use hose clamps(just make sure they won't rust).

troek · 01-21-2014, 07:14 AM

glad to hear that made some difference! im thinking about doing it eventualy on my J2 exhaust.

ChandlerSwyng · 01-21-2014, 10:27 AM

I have the N1 catback and just recieved my invidia catless resonated front pipe, will the resonator cut down the rasp?

10-11-2013, 11:08 PM	#20
wparsons Senior Member Join Date: Jul 2012 Drives: 2013 Asphalt FR-S Manual Location: Whitby, ON, Canada Posts: 6,716 Thanks: 7,875 Thanked 3,353 Times in 2,134 Posts Mentioned: 99 Post(s)	The farty noise in this is rasp: [ame="http://www.youtube.com/watch?v=60Y9fRTidiI"]Exhaust raspy - YouTube[/ame] [ame="http://www.youtube.com/watch?v=ZBdQZjRjzps"]Raspy ass Civic - YouTube[/ame] __________________ Light travels faster than sound, so people may appear to be bright until you hear them speak... flickr

10-13-2013, 09:47 AM	#25
wparsons Senior Member Join Date: Jul 2012 Drives: 2013 Asphalt FR-S Manual Location: Whitby, ON, Canada Posts: 6,716 Thanks: 7,875 Thanked 3,353 Times in 2,134 Posts Mentioned: 99 Post(s)	Noise and rasp aren't the same thing, you can have a LOUD not raspy exhaust or a quieter but raspy exhaust. Typically the loud ones are raspy though. __________________ Light travels faster than sound, so people may appear to be bright until you hear them speak... flickr

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10-11-2013, 03:45 PM	#15
zc06_kisstherain Join Date: Aug 2012 Drives: SWP BRZ Location: NJ Posts: 3,196 Thanks: 727 Thanked 670 Times in 510 Posts Mentioned: 15 Post(s)	I have Motiv Front pipe (catless) and Nameless axleback. It doesn't rasp but drones a bit but not bad. I believe usually whole bolts-on had catless, shouldnt rasp or drones. maybe i was wrong and this car is different than other cars. keep us updated what you changed. i might get a header and dont want crazy rasp

10-11-2013, 09:18 PM	#17
djliquidsteele Senior Member Join Date: Apr 2012 Drives: Scion FR-S Location: Louisville, KY Posts: 498 Thanks: 62 Thanked 130 Times in 92 Posts Mentioned: 2 Post(s)	can someone please define raspy for me? If this: [ame="http://www.youtube.com/watch?v=Y18bo5IYE50"]86 TRD Griffon Concept 2nd test - YouTube[/ame] is raspy, then god damn me, I love it!!!

10-12-2013, 04:54 PM	#21
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)	So i think I will sell my berk muffler delete or install a muffler on the midpipe or get a Invidia N1 catback. How would the N1 sound vs. the berk muffler delete everything else being constant (same uel headers, catless fp, overpipe)

10-12-2013, 11:31 PM	#22
kuhlka Senior Member Join Date: May 2013 Drives: 2013 BRZ Limited AT Location: NW Ohio Posts: 437 Thanks: 227 Thanked 147 Times in 97 Posts Mentioned: 6 Post(s)	The least raspy/tinny/farty muffler I've heard so far has been the Perrin resonated catback. Everything else tends to sound high pitched, tinny (metallic tinging), or has that farty bark. I've got the Rev Works UEL in and it sounds great with the stock exhaust. I just need the full Perrin headerback, now.

01-21-2014, 05:47 AM	#26
stevo_12v Banned Join Date: Feb 2012 Drives: Mazda MX-6 Turbo, Toyota GTS86 37J Location: Perth, Western Australia Posts: 1,262 Thanks: 487 Thanked 743 Times in 413 Posts Mentioned: 20 Post(s)	I tried heatwrap and some hoseclamps a couple of days ago to stop the thin stainless steel pipe on my CBE from vibrating so much(causing the rapsy sound). Quite a noticeable difference. I'll be getting some more heatwrap to wrap near the muffler and a bit further up the CBE. I would not try this with a NON stainless steel exhaust btw. TIP: You can also get DEI stainless steel zip ties to secure the heat wrap, don't bother. Cheaper and easier to get/use hose clamps(just make sure they won't rust).

01-21-2014, 07:14 AM	#27
troek Senior Member Join Date: Feb 2013 Drives: 2012 Toyota 86 Location: Japan Posts: 1,294 Thanks: 333 Thanked 396 Times in 285 Posts Mentioned: 17 Post(s)	glad to hear that made some difference! im thinking about doing it eventualy on my J2 exhaust.

01-21-2014, 10:27 AM	#28
ChandlerSwyng Senior Member Join Date: Feb 2013 Drives: 2013 Red Subaru Brz Location: Phoenix Posts: 699 Thanks: 111 Thanked 207 Times in 133 Posts Mentioned: 9 Post(s)	I have the N1 catback and just recieved my invidia catless resonated front pipe, will the resonator cut down the rasp?

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