Exhaust system: dual or single - Page 12 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

old greg · 02-24-2012, 12:57 PM

It works on the HSV-010 because that car has a flat crank v8, which means that the exhaust pulses coming out of each bank of cylinders is evenly spaced so there is no benefit, scavenging-wise, to connecting the two sides of the engine. A Subaru boxer engine is completely the opposite of this, each cylinder needs to be connected to the opposing cylinder for proper scavenging to occur.

The nearest equivalent on a suby motor would be to have the front cylinders feed one exhaust pipe, and the rears feed the other. But really, the main reason that the Honda sounds the way it does is that it has a flat crank v8 revving to 10000 rpm.

Homemade WRX · 02-24-2012, 05:44 PM

^^yup

and the sound of a flat plane crank spinning to 5 digits makes me drool.

ESBjiujitsu · 05-01-2012, 01:55 PM

Has anyone suggested single side exit right behind the door like with the BRZ GT300? Leave the necessary CATs and just open it up to the side. Loose some weight, gain some noise, and looks cool?!?!

StarsGarrador · 05-02-2012, 09:01 AM

It's so... Beautiful I want it

ESBjiujitsu · 05-02-2012, 09:21 AM

yeah there is no doubt if i could have that car as it sits i would be one crazy happy m*^&er f$%^er lol

But i am hoping that a side exhaust is something that can be performed in my garage or the local exhaust shop

WolfpackS2k · 05-02-2012, 10:30 AM

Quote:

Originally Posted by ESBjiujitsu

yeah there is no doubt if i could have that car as it sits i would be one crazy happy m*^&er f$%^er lol

But i am hoping that a side exhaust is something that can be performed in my garage or the local exhaust shop

A side exhaust for this car, without any resonators or mufflers, besides being super loud, would just sound HORRIBLE.

ESBjiujitsu · 05-02-2012, 11:27 AM

Im not opposed to having a resonator or an exhaust I just think it looks clean out the side and would potentially save weight and costs to the exhaust. Im looking for a everyday driver so I certainly dont need a deafening exhaust note

YukiHachiRoku · 05-03-2012, 10:24 PM

Quote:

Originally Posted by Dimman

I wouldn't worry about how the exhaust will affect Right-Left balance. Different driver weights would affect it more.

And don't let no fatties in the passenger seat! Heh.

I need to lose 20 lbs, used to weigh 150, but since I got this job it went up to 170.

And only anorexic chics or chics with bulemia are allowed to ride shot-gun

back seats will remain permanently in 'down position'

As for exhaust, single dual exit looks clean imo.

AJ PwR · 05-04-2012, 01:33 AM

Personally, I am not a fan of dual exhaust but dual will be quieter with less drone . Singe will be much lighter louder and making more power. I used to have dual 2.5" exhaust on my s2k and it only made like 5hp but when I switched to single I gained a lot more !

IMO, I think the car has dual exhaust cut out so it may look better with dual.

Here's the pic of my old car !

View Poll Results: What Exhaust set-up should the FT come with?
Single Exhaust - 1 exit	86	36.60%
Single Exhaust - 2 exits (2 mufflers)	71	30.21%
Single Exhaust - Centre	15	6.38%
Dual Exhaust	63	26.81%
Voters: 235. You may not vote on this poll

05-02-2012, 09:01 AM	#158
StarsGarrador Gangnam Style Guru Join Date: Apr 2012 Drives: Suzuki GSXF650, WRB BRZ Location: Franklin, TN Posts: 526 Thanks: 463 Thanked 114 Times in 79 Posts Mentioned: 3 Post(s)	It's so... Beautiful I want it __________________ http://www.ft86club.com/forums/showthread.php?t=10270 <---- My Build Log

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02-24-2012, 12:57 PM	#155
old greg Rocket Surgeon Join Date: Apr 2011 Drives: PSM GGA OMG Location: FL Posts: 1,312 Thanks: 10 Thanked 141 Times in 84 Posts Mentioned: 2 Post(s)	It works on the HSV-010 because that car has a flat crank v8, which means that the exhaust pulses coming out of each bank of cylinders is evenly spaced so there is no benefit, scavenging-wise, to connecting the two sides of the engine. A Subaru boxer engine is completely the opposite of this, each cylinder needs to be connected to the opposing cylinder for proper scavenging to occur. The nearest equivalent on a suby motor would be to have the front cylinders feed one exhaust pipe, and the rears feed the other. But really, the main reason that the Honda sounds the way it does is that it has a flat crank v8 revving to 10000 rpm.

02-24-2012, 05:44 PM	#156
Homemade WRX Pro Subie Engine Nerd Join Date: Dec 2011 Drives: BRZ has a reserved space Location: 3MI Racing LLC Posts: 261 Thanks: 0 Thanked 1 Time in 1 Post Mentioned: 1 Post(s)	^^yup and the sound of a flat plane crank spinning to 5 digits makes me drool.

05-04-2012, 01:33 AM	#163
AJ PwR Join Date: Jan 2012 Drives: R35 R56 CZ4A ZC6 Location: Vancouver B.C. Posts: 284 Thanks: 1 Thanked 190 Times in 77 Posts Mentioned: 6 Post(s)	Personally, I am not a fan of dual exhaust but dual will be quieter with less drone . Singe will be much lighter louder and making more power. I used to have dual 2.5" exhaust on my s2k and it only made like 5hp but when I switched to single I gained a lot more ! IMO, I think the car has dual exhaust cut out so it may look better with dual. Here's the pic of my old car !

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