Strange hiss on acceleration with HFC

Cegla · 09-16-2016, 11:24 AM

Hello,

I have Nismo CBE. I installed HFC yesterday. Now with HFC I hear strange hiss. Only on full throttle acceleration. Hiss is mostly coming from back of my car. Is this normal? There is almost no rasp at any time or hiss on deacceleration.

With stock cats everything was normal.

Sorry for my English.

Chris

Trips · 09-16-2016, 12:18 PM

Perfectly normal and no need to be concerned.

The stock cats hold back exhaust noise thats normal for the VQ engine.

By using HFCS's or Test Pipes it magnifies the hiss which is noticeable mostly on deceleration though.

Have Fun and enjoy your HFC's

Cegla · 09-16-2016, 12:51 PM

Thanks for response.

I thought that rasp with hfc exist only at mid range rpm and hiss on deacceleration. I hear hiss ( or slight rasp Im not sure ) only on hard full throttle acceleration. Strange.

09-16-2016, 11:24 AM	#1 (permalink)
Cegla Base Member Join Date: Mar 2013 Location: Poland Posts: 18 Drives: 370Z GT Edition Rep Power: 12	Strange hiss on acceleration with HFC Hello, I have Nismo CBE. I installed HFC yesterday. Now with HFC I hear strange hiss. Only on full throttle acceleration. Hiss is mostly coming from back of my car. Is this normal? There is almost no rasp at any time or hiss on deacceleration. With stock cats everything was normal. Sorry for my English. Chris Last edited by Cegla; 09-16-2016 at 12:14 PM.

09-16-2016, 12:18 PM	#2 (permalink)
Trips Administrator Join Date: May 2009 Location: Disneyland, Ca Posts: 8,732 Drives: 🔰 Rep Power: 10	Perfectly normal and no need to be concerned. The stock cats hold back exhaust noise thats normal for the VQ engine. By using HFCS's or Test Pipes it magnifies the hiss which is noticeable mostly on deceleration though. Have Fun and enjoy your HFC's __________________

09-16-2016, 12:51 PM	#3 (permalink)
Cegla Base Member Join Date: Mar 2013 Location: Poland Posts: 18 Drives: 370Z GT Edition Rep Power: 12	Thanks for response. I thought that rasp with hfc exist only at mid range rpm and hiss on deacceleration. I hear hiss ( or slight rasp Im not sure ) only on hard full throttle acceleration. Strange. Last edited by Cegla; 09-16-2016 at 03:36 PM.

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