Hissing from hfc, is it a rumor?

FuTuRe is Z · 04-19-2015, 09:07 PM

Those who are experiencing a hiss with HFCs are experiencing it as a result of their exhaust and HFC pipes not mating. Some members are running a HFC with a 2.25 in outlet and then are running a 2.5" exhaust. Or some are running a 2.5" HFC and then a 2.25" inch exhaust. The variations in piping diameter at the flanges are causing air to seep out and creating a hissing sound.

Rusty · 04-19-2015, 09:49 PM

Quote:

Originally Posted by FuTuRe is Z

Those who are experiencing a hiss with HFCs are experiencing it as a result of their exhaust and HFC pipes not mating. Some members are running a HFC with a 2.25 in outlet and then are running a 2.5" exhaust. Or some are running a 2.5" HFC and then a 2.25" inch exhaust. The variations in piping diameter at the flanges are causing air to seep out and creating a hissing sound.

That's a possibility. BUT, some have complete systems with matching diameters. And they still have it. The stock exhaust has it to some degree. If you look back to 2010 or there abouts. It was brought up then.

FuTuRe is Z · 04-22-2015, 08:41 PM

Quote:

Originally Posted by Rusty

That's a possibility. BUT, some have complete systems with matching diameters. And they still have it. The stock exhaust has it to some degree. If you look back to 2010 or there abouts. It was brought up then.

I'll be installing HFCs to compliment my Injen exhaust and I'll report back to you. They're both 2.25"

Popwarfirm2 · 04-26-2015, 04:57 PM

It would be great if you can post it. I am curious to see as well.

NefariousZ34 · 04-28-2015, 12:47 AM

Quote:

Originally Posted by Rusty

That's a possibility. BUT, some have complete systems with matching diameters. And they still have it. The stock exhaust has it to some degree. If you look back to 2010 or there abouts. It was brought up then.

I have a 2015 Nismo Z and I'm noticing the hiss already and just hit 200 miles it's quiet now but my berks are on their way so I'm sure it will get louder. I'm a little concerned there maybe a vacuum leak somewhere. After you mentioned this it happens around 2k and above as the rpms go back down at idle so this must be exhaust? I just don't want to start modding if it could be an issue the dealership should fix first.

Not to hi jack just keeping up with all the information I can since I've been looking into this as well. I'm looking forward to hearing the Nismo exhaust open up a little bit.

04-19-2015, 09:07 PM	#1 (permalink)
FuTuRe is Z Enthusiast Member Join Date: Nov 2013 Location: CT Posts: 263 Drives: 2014 370z Rep Power: 12	Those who are experiencing a hiss with HFCs are experiencing it as a result of their exhaust and HFC pipes not mating. Some members are running a HFC with a 2.25 in outlet and then are running a 2.5" exhaust. Or some are running a 2.5" HFC and then a 2.25" inch exhaust. The variations in piping diameter at the flanges are causing air to seep out and creating a hissing sound. eastwest2300 and Popwarfirm2 like this.

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04-26-2015, 04:57 PM	#4 (permalink)
Popwarfirm2 Base Member Join Date: Sep 2014 Location: Tucson, Arizona and CA Posts: 38 Drives: 11 Nissan 370z BS M6 Rep Power: 11	It would be great if you can post it. I am curious to see as well.