Hissing from hfc, is it a rumor?

lj909 · 04-13-2015, 11:49 PM

Well i don't know why the engine makes that sounds but yes it does. I have Ark r spec resonated hfc and it's makes the hiss in deceleration. I almost can't even hear it but the more you open up your exhaust the louder it gets. I had a 350hr with headers and straight pipes. The hiss was loud

BRM3D1NA · 04-14-2015, 01:56 AM

Quote:

Originally Posted by Popwarfirm2

Do you happen to know what in the engine is causing it? What system is it?

Honestly I don't but if anyone on here does, please let us know because I've been wondering that myself. Curious what makes the engine have that unique sound, I think it would be cool to know.

Quote:

Originally Posted by lj909

Well i don't know why the engine makes that sounds but yes it does. I have Ark r spec resonated hfc and it's makes the hiss in deceleration. I almost can't even hear it but the more you open up your exhaust the louder it gets. I had a 350hr with headers and straight pipes. The hiss was loud

Well then when I install my test pipes this week I can expect that hiss to louden also....oh well!

Rusty · 04-14-2015, 05:57 AM

Think the hiss is related to the VVEL operation with aftermarket exhaust. The exhaust changed the harmonics within the system and it's not tuned for it.

mults · 04-14-2015, 02:16 PM

Quote:

Originally Posted by lj909

Well i don't know why the engine makes that sounds but yes it does. I have Ark r spec resonated hfc and it's makes the hiss in deceleration. I almost can't even hear it but the more you open up your exhaust the louder it gets. I had a 350hr with headers and straight pipes. The hiss was loud

I have Berk HFCs and CBE and the hiss is definitely there. Does not bother me at all and actually sounds kind of 'exotic'. I tell everyone that it is the "snake" inside ready to pounce on some of those lesser vehicles

.

04-13-2015, 11:49 PM	#1 (permalink)
lj909 Track Member Join Date: May 2014 Location: Riverside Posts: 584 Drives: 40th 370Z Rep Power: 14	Well i don't know why the engine makes that sounds but yes it does. I have Ark r spec resonated hfc and it's makes the hiss in deceleration. I almost can't even hear it but the more you open up your exhaust the louder it gets. I had a 350hr with headers and straight pipes. The hiss was loud BRM3D1NA likes this. __________________ PW 07 HR350Z R.I.P. Totaled by 82yr old woman 2010 40th Anniversary 370Z

04-14-2015, 05:57 AM	#3 (permalink)
Rusty A True Z Fanatic Join Date: Dec 2011 Location: Fayettenam,Pennsyltucky Age: 70 Posts: 35,571 Drives: 2011 Nismo GM 6M Rep Power: 2684440	Think the hiss is related to the VVEL operation with aftermarket exhaust. The exhaust changed the harmonics within the system and it's not tuned for it. Popwarfirm2 likes this. __________________ 浪人 - 殺し屋 "The Difficult Anytime, The Impossible By Appointment Only" http://www.the370z.com/members-370z-...o-journal.html

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