Fast Intentions exhaust is here! (continued)

megalapagas · 07-06-2013, 06:16 AM

I read up on that too^^ but I don't think soo I think its natural for the exhaust to hiss on decelaration (well on F.I exhaust that is)....would be great for ppl with this exhaust installed to chime in or F.I personell because I've been having that in mind aswell?

scottIN · 07-06-2013, 06:34 AM

Mine hisses like crazy during decel when there is engine braking. So it's especially prevalent on hills. Some people say it's only for a few seconds, but mine will do it for 15-20 seconds on a hill by my house because I usually coast down it.I've never been able to find a leak anywhere (no black streaks or anything at any of the joints, and I would assume that if it was a leak you'd also hear it under load.

I've asked a few times and never really heard a straight answer as to WHAT is happening, just that it's because of the HFCs. I love the sound of the FI, but the hiss can be annoying, especially if you're in traffic and it does it every time you slow down. I've had a couple people ask me if I had a turbo because it sounds like a pop-off valve.

/Angelo350Z/ · 07-06-2013, 07:17 AM

Glad to hear the hiss isn't out of the norm. Initially I thought it was a heat shield, or worse, the sway bar coming in contact with the vibrating exhaust components. It goes away so I'm positive it's just the sound of a cat-less VQ just like G37Sam mentioned.

07-06-2013, 07:17 AM	#3 (permalink)
/Angelo350Z/ A True Z Fanatic Join Date: Feb 2013 Location: Germany Posts: 2,230 Drives: Z34 \| MK7 \| F82 Rep Power: 3662	Glad to hear the hiss isn't out of the norm. Initially I thought it was a heat shield, or worse, the sway bar coming in contact with the vibrating exhaust components. It goes away so I'm positive it's just the sound of a cat-less VQ just like G37Sam mentioned. __________________ 2013 MB NISSAN 370Z SPORT

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07-06-2013, 06:16 AM	#1 (permalink)
megalapagas Enthusiast Member Join Date: May 2013 Location: McAllen,TX Posts: 457 Drives: '10 370Z Tour A/T Rep Power: 14	I read up on that too^^ but I don't think soo I think its natural for the exhaust to hiss on decelaration (well on F.I exhaust that is)....would be great for ppl with this exhaust installed to chime in or F.I personell because I've been having that in mind aswell?

07-06-2013, 06:34 AM	#2 (permalink)
scottIN Track Member Join Date: Aug 2011 Location: New Castle, Indiana Posts: 764 Drives: '12 370Z Rep Power: 56	Mine hisses like crazy during decel when there is engine braking. So it's especially prevalent on hills. Some people say it's only for a few seconds, but mine will do it for 15-20 seconds on a hill by my house because I usually coast down it.I've never been able to find a leak anywhere (no black streaks or anything at any of the joints, and I would assume that if it was a leak you'd also hear it under load. I've asked a few times and never really heard a straight answer as to WHAT is happening, just that it's because of the HFCs. I love the sound of the FI, but the hiss can be annoying, especially if you're in traffic and it does it every time you slow down. I've had a couple people ask me if I had a turbo because it sounds like a pop-off valve.