j2 quad exhaust questions - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

brichard0625 · 09-03-2014, 11:53 AM

i recently installed a j2 quad exhaust and I'm experiencing backfire at high rpms. anybody else experiencing this. I do have a catless front pipe attached but i checked my logs and my a/f ratio is anywhere between 12.2-12.5 open throttle which i don't think is bad. another thing is my exhaust is super loud, nothing like what i hear in videos. its super loud no matter what rpm i am in, just wanted to know what setups people are running with the quad and is it super loud even when cruising? thank you for the help

edeekeos · 09-03-2014, 12:14 PM

The J2 Quad is 2.75 piping, its gonna be LOUD. Especially with a test pipe. Im dealing with this right now with my setup. It's a love/hate ordeal. I may try running a resonated front pipe to see if that tames it a little. Looks at the CNT Racing front pipe, it looks like a good deal.

aznatama · 09-03-2014, 12:16 PM

catless front pipe will cause it to be loud. Do you have a resonator? or is it a straight pipe?

Backfire is likely from low afr + no cat. I'm assuming you only get it when you're pushing the car, and it's not backfiring at idle or something ridiculous like that right? Unused hot fuel + fresh air = backfire. No way around that unless you put in a cat.

brichard0625 · 09-03-2014, 01:23 PM

thanx for the help guys. I knew the front pipe would make it loud, but it was crazy loud, I felt something was wrong. It was backfiring at high rpms now at idle. I just went underneath the car and did the soapy water leak test to find that my front pipe underneath the car was leaking. I used the old bolts from the pipe and i found that one of them did crack and caused that pipe to not be sealed properly to the midpipe. exhaust sounds much much better now, still loud but if could hear what it sounded like before was crazy. thanx for the help guys

Pooverdam · 09-04-2014, 02:04 AM

You get used to it. It'll quiet down after a while. But I love it.

Covo_86 · 09-04-2014, 01:36 PM

where did you get your j2 quad ? Every website is out of stock

Pooverdam · 09-05-2014, 12:16 AM

Redline360 dot com

09-03-2014, 11:53 AM	#1
brichard0625 Senior Member Join Date: Jun 2012 Drives: 2013 Scion Frs(Scarlet) Location: Bronx, NY Posts: 907 Thanks: 172 Thanked 386 Times in 177 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	j2 quad exhaust questions i recently installed a j2 quad exhaust and I'm experiencing backfire at high rpms. anybody else experiencing this. I do have a catless front pipe attached but i checked my logs and my a/f ratio is anywhere between 12.2-12.5 open throttle which i don't think is bad. another thing is my exhaust is super loud, nothing like what i hear in videos. its super loud no matter what rpm i am in, just wanted to know what setups people are running with the quad and is it super loud even when cruising? thank you for the help __________________

09-03-2014, 12:16 PM	#3
aznatama Senior Member Join Date: May 2014 Drives: 2014 BRZ MT (Sold); 2006 V70R Location: Fairfax Posts: 873 Thanks: 10 Thanked 186 Times in 150 Posts Mentioned: 8 Post(s) Tagged: 0 Thread(s)	catless front pipe will cause it to be loud. Do you have a resonator? or is it a straight pipe? Backfire is likely from low afr + no cat. I'm assuming you only get it when you're pushing the car, and it's not backfiring at idle or something ridiculous like that right? Unused hot fuel + fresh air = backfire. No way around that unless you put in a cat. __________________ '14 BRZ LTD MT DGM

09-03-2014, 01:23 PM	#4
brichard0625 Senior Member Join Date: Jun 2012 Drives: 2013 Scion Frs(Scarlet) Location: Bronx, NY Posts: 907 Thanks: 172 Thanked 386 Times in 177 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	thanx for the help guys. I knew the front pipe would make it loud, but it was crazy loud, I felt something was wrong. It was backfiring at high rpms now at idle. I just went underneath the car and did the soapy water leak test to find that my front pipe underneath the car was leaking. I used the old bolts from the pipe and i found that one of them did crack and caused that pipe to not be sealed properly to the midpipe. exhaust sounds much much better now, still loud but if could hear what it sounded like before was crazy. thanx for the help guys __________________

09-04-2014, 01:36 PM	#6
Covo_86 Senior Member Join Date: Apr 2014 Drives: Whiteout FRS Location: NY Posts: 157 Thanks: 34 Thanked 18 Times in 16 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	where did you get your j2 quad ? Every website is out of stock __________________ My Build - Instagram

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09-04-2014, 02:04 AM	#5
Pooverdam Member Join Date: Nov 2012 Drives: Whiteout 6MT FRS Location: MA Posts: 95 Thanks: 123 Thanked 62 Times in 26 Posts Mentioned: 5 Post(s) Tagged: 2 Thread(s)	You get used to it. It'll quiet down after a while. But I love it.

09-05-2014, 12:16 AM	#7
Pooverdam Member Join Date: Nov 2012 Drives: Whiteout 6MT FRS Location: MA Posts: 95 Thanks: 123 Thanked 62 Times in 26 Posts Mentioned: 5 Post(s) Tagged: 2 Thread(s)	Redline360 dot com

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