Exhaust crackle and pop? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Kiwi · 03-20-2013, 03:43 AM

Hi everybody

I've been looking at a few exhaust for the FRS and there's just something I find a bit boring about it. The sound it makes when throttle is open is nice, but on the overrun it sounds quite lacking, it's just a smooth note back down to idle. Is there anyway to add in some nice crackle and pop back in like these cars?

[ame="http://www.youtube.com/watch?v=u2gUsy1Yn4U"]Megane 3 RS 250 Cup 3" K-Tec Exhaust and 3" Decat part2 - YouTube[/ame]

[ame="http://www.youtube.com/watch?v=f1jUsligR-I"]2011 MINI Cooper S Exhaust "Pop and burble" - YouTube[/ame]

I'm not an engineer or expert on engine and exhaust tuning, but from what I can find on the internet the cause is that the throttle is still open very little on the overrun, the unburnt fuel enter exhausts and that is whats causing the crackling. The thing is that the frs (like most cars) cut the throttle fully on the engine deceleration, but when the rpm gets close to idle the throttle needs to be opened again to prevent it from stalling. So if you listen closely in the video below around the 0:18 you can hear a few slight pops when its nearing idle as the throttle is opened automatically by the ecu.

The Mini Cooper S shown above only creates that sound when in sport mode, so I believe it is mostly the engine tuning that controls it. Which got me wondering if it is possible to get something similar on the FRS with an ECU tune.

[ame="http://www.youtube.com/watch?v=cXYnyvJEDDA"]GReddy Racing SP Elite -Exhaust - Scion FR-S - YouTube[/ame]

The pop and burble are more obvious in this video below, even has some visual cues (notice the exhaust gas coming out)
[ame="http://www.youtube.com/watch?v=kwxqyn4IBj8"]Scion FRS and Subaru BRZ FT-86 SpeedFactory V1 Exhaust - YouTube[/ame]

BillY2KFRC · 03-20-2013, 08:48 AM

A turbo or modified car will normally produce more of this overrun popping sound, mostly because of the extra fuel. But you seem to have it nailed, it's in the tune. Having the car run a little rich on decel will cause some nice pops and even spits of fire on a car with a straight through exhaust. Running catless helps too, since a lot of the unburnt fuel burns up in the cats. (this is likely why the car in the video you posted is doing it it)

I'm a big fan of this sound as well, my Vette makes awesome noises on decel. Brake HARD into a turn, heal/toe down 2 gears, blipping to 5k+, listen to the spits of hellfire popping out the back of the car... my personal favorite part of driving a modified car. Listen to some F40/F40LM clips on YouTube if you want to hear CRAZY overrun popping!

vtmike · 03-20-2013, 09:02 AM

A front pipe with a high flow cat adds some crackle and pop. Paired with a nice axleback or catback and it sounds nice.

Sent from my Galaxy Nexus using Tapatalk 2

BuBlake · 03-20-2013, 09:59 AM

I hear some nice burbling and pops on deceleration 90% of the time with my Invidia catless frontpipe and Invidia N1 catback. I'm getting Unichip soon, so it will be interesting to see how this effects the sound. My guess is that Unichip will lean it out a little more... I think that means it will also be decreasing the magnitude and frequency of the backfires?

Skurj · 03-20-2013, 05:01 PM

You should hear my Guzzi on a hot day on deccel. Not so sure its a good thing though.

Cade01 · 03-20-2013, 07:17 PM

My Triumph Street Triple R with a Competition Werkes Shorty gets some pretty nice pops on decel and revving

Mr.Jay · 03-20-2013, 07:23 PM

My SRT fullheaderback does this. I'm running a bit rich up top so when I rev her out I get some in my soundtrack

djliquidsteele · 03-20-2013, 08:15 PM

I have Motiv Concepts over pipe, track front pipe, stock mid pipe, and Mach V dual muffler delete and I get all kinds of crack, burble and pop. LOUD, but damn I love the sound.

FR-S Matt · 03-20-2013, 09:42 PM

For some reason I thought of Rice Krispies when opening this thread.

WolfsFang · 03-20-2013, 09:55 PM

I made my own axle back and i get this noise when i downshift while im driving hard.

LeeMaster · 03-20-2013, 10:03 PM

[ame]http://youtu.be/g_UeniEhdQc?t=9m56s[/ame]

carbonBLUE · 03-20-2013, 10:55 PM

my car pops and burbles stock... lol

WolfsFang · 03-21-2013, 01:20 AM

i think that yellow car in the op has antilag.

Hanakuso · 03-21-2013, 01:55 AM

U aint bout life cuh

03-20-2013, 03:43 AM	#1
Kiwi Senior Member Join Date: Sep 2011 Drives: Volkswagen Golf GTI Location: Canada Posts: 151 Thanks: 1 Thanked 13 Times in 9 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Exhaust crackle and pop? Hi everybody I've been looking at a few exhaust for the FRS and there's just something I find a bit boring about it. The sound it makes when throttle is open is nice, but on the overrun it sounds quite lacking, it's just a smooth note back down to idle. Is there anyway to add in some nice crackle and pop back in like these cars? [ame="http://www.youtube.com/watch?v=u2gUsy1Yn4U"]Megane 3 RS 250 Cup 3" K-Tec Exhaust and 3" Decat part2 - YouTube[/ame] [ame="http://www.youtube.com/watch?v=f1jUsligR-I"]2011 MINI Cooper S Exhaust "Pop and burble" - YouTube[/ame] I'm not an engineer or expert on engine and exhaust tuning, but from what I can find on the internet the cause is that the throttle is still open very little on the overrun, the unburnt fuel enter exhausts and that is whats causing the crackling. The thing is that the frs (like most cars) cut the throttle fully on the engine deceleration, but when the rpm gets close to idle the throttle needs to be opened again to prevent it from stalling. So if you listen closely in the video below around the 0:18 you can hear a few slight pops when its nearing idle as the throttle is opened automatically by the ecu. The Mini Cooper S shown above only creates that sound when in sport mode, so I believe it is mostly the engine tuning that controls it. Which got me wondering if it is possible to get something similar on the FRS with an ECU tune. [ame="http://www.youtube.com/watch?v=cXYnyvJEDDA"]GReddy Racing SP Elite -Exhaust - Scion FR-S - YouTube[/ame] The pop and burble are more obvious in this video below, even has some visual cues (notice the exhaust gas coming out) [ame="http://www.youtube.com/watch?v=kwxqyn4IBj8"]Scion FRS and Subaru BRZ FT-86 SpeedFactory V1 Exhaust - YouTube[/ame]

03-20-2013, 08:48 AM	#2
BillY2KFRC Senior Member Join Date: Nov 2011 Drives: 2003 Corvette Z06, ECS Dry Sump 427 Location: Beacon Falls, CT Posts: 102 Thanks: 6 Thanked 52 Times in 24 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	A turbo or modified car will normally produce more of this overrun popping sound, mostly because of the extra fuel. But you seem to have it nailed, it's in the tune. Having the car run a little rich on decel will cause some nice pops and even spits of fire on a car with a straight through exhaust. Running catless helps too, since a lot of the unburnt fuel burns up in the cats. (this is likely why the car in the video you posted is doing it it) I'm a big fan of this sound as well, my Vette makes awesome noises on decel. Brake HARD into a turn, heal/toe down 2 gears, blipping to 5k+, listen to the spits of hellfire popping out the back of the car... my personal favorite part of driving a modified car. Listen to some F40/F40LM clips on YouTube if you want to hear CRAZY overrun popping! __________________ 2003 Corvette Z06 - Dry Sump LS7 built by East Coast Supercharging 560rwhp & 549rwtq 10.8@134 2013 Subaru BRZ Limited - WRB, 6MT, PTuning Header, Motriv OP & FP, Perrin Res. Catback, Toms Tail Lights, Sprint Springs, Rays 57DR Wheels, 186rwhp

03-20-2013, 05:01 PM	#5
Skurj Senior Member Join Date: Nov 2012 Drives: SOLD... Location: GTA Ontario Posts: 955 Thanks: 56 Thanked 191 Times in 154 Posts Mentioned: 7 Post(s) Tagged: 0 Thread(s)	You should hear my Guzzi on a hot day on deccel. Not so sure its a good thing though. __________________ WRB MT BRZ Sport Tech Delivered March 21 2013 Its mine now!! Paid for Mar 2018 and its gone... Sept '18 tho I am sure I will miss it Replaced with 18 50th edition ND

03-20-2013, 07:23 PM	#7
Mr.Jay Senior Member Join Date: Mar 2011 Drives: FRS :D Location: Vancouver BC Posts: 2,985 Thanks: 545 Thanked 699 Times in 438 Posts Mentioned: 18 Post(s) Tagged: 0 Thread(s)	My SRT fullheaderback does this. I'm running a bit rich up top so when I rev her out I get some in my soundtrack __________________ Out of the FRS game

03-20-2013, 09:55 PM	#10
WolfsFang Scrape Master Join Date: Jun 2012 Drives: Goal: Oldest FRS State Side Location: North NJ Posts: 1,161 Thanks: 238 Thanked 412 Times in 238 Posts Mentioned: 10 Post(s) Tagged: 0 Thread(s)	I made my own axle back and i get this noise when i downshift while im driving hard. __________________ You do realize comparing the BRZ to the FR-S is like comparing which hand you love masterbating too right?

03-20-2013, 09:02 AM	#3
vtmike Senior Member Join Date: Jun 2012 Drives: Scion FR-S Location: Virginia Posts: 477 Thanks: 80 Thanked 134 Times in 103 Posts Mentioned: 13 Post(s) Tagged: 1 Thread(s)	A front pipe with a high flow cat adds some crackle and pop. Paired with a nice axleback or catback and it sounds nice. Sent from my Galaxy Nexus using Tapatalk 2

03-20-2013, 07:17 PM	#6
Cade01 Senior Member Join Date: Jun 2012 Drives: '13 White FR-S, 09 Triumph St.3 R Location: Eugene, OR Posts: 812 Thanks: 30 Thanked 135 Times in 106 Posts Mentioned: 8 Post(s) Tagged: 0 Thread(s)	My Triumph Street Triple R with a Competition Werkes Shorty gets some pretty nice pops on decel and revving

03-20-2013, 08:15 PM	#8
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) Tagged: 0 Thread(s)	I have Motiv Concepts over pipe, track front pipe, stock mid pipe, and Mach V dual muffler delete and I get all kinds of crack, burble and pop. LOUD, but damn I love the sound.

03-20-2013, 10:03 PM	#11
LeeMaster Red wine Join Date: Oct 2012 Drives: Subaru BRZ(R.I.P) Location: Denied Posts: 1,176 Thanks: 1,268 Thanked 342 Times in 240 Posts Mentioned: 13 Post(s) Tagged: 0 Thread(s)	[ame]http://youtu.be/g_UeniEhdQc?t=9m56s[/ame] __________________

03-20-2013, 10:55 PM	#12
carbonBLUE Reverse Burnouts Join Date: Oct 2011 Drives: 2013 Argento FRS Location: dallas!!! Posts: 2,894 Thanks: 707 Thanked 1,257 Times in 592 Posts Mentioned: 30 Post(s) Tagged: 1 Thread(s)	my car pops and burbles stock... lol __________________ 2000 Carbon Blue Toyota Celica GTS 152000 miles (wont forget you) 2013 Argento Scion FR-S 2011 Infiniti G37x

03-21-2013, 01:20 AM	#13
WolfsFang Scrape Master Join Date: Jun 2012 Drives: Goal: Oldest FRS State Side Location: North NJ Posts: 1,161 Thanks: 238 Thanked 412 Times in 238 Posts Mentioned: 10 Post(s) Tagged: 0 Thread(s)	i think that yellow car in the op has antilag. __________________ You do realize comparing the BRZ to the FR-S is like comparing which hand you love masterbating too right?

03-21-2013, 01:55 AM	#14
Hanakuso Senior Member Join Date: Apr 2012 Drives: FR-S Location: California Posts: 1,956 Thanks: 294 Thanked 673 Times in 390 Posts Mentioned: 11 Post(s) Tagged: 2 Thread(s)	U aint bout life cuh

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