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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]

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)	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]