Weird Hissing/Air Noise??

Burriss03 · 04-20-2015, 05:15 PM

Don't know if this has ever been discussed before but i have a question. OK this is my setup:
-Stillen Gen 3 intakes
-FI non-resonated exhaust
-FI test pipes
I had the exhaust for about year, i then still wanted it louder. So after I installed the FI test pipes, there was an immediate hissing type of noise when u let off the gas, it sounds like pressure releasing or something of that nature. Is this normal or has anyone ever had this same thing? Also, could it be that I need to get the car tuned after having all that done? Any help would be awesome. Thanks!

Chuck33079 · 04-20-2015, 05:22 PM

It's normal with this motor.

dP3NGU1N · 04-20-2015, 05:40 PM

happens with VQ engines. HFCs and test pipes will make the noise.

Rusty · 04-20-2015, 05:44 PM

Quote:

Originally Posted by Chuck33079

It's normal with this motor.

2X Yep, normal.

Sales@F.I. Inc. · 04-20-2015, 05:57 PM

OP: It is quite normal to hear a hissing sound on deceleration once adding high flow cats or test pipes. It is the natural harmonic of the VQ37VHR motor. The sound is more prominent once you remove your restrictive OEM catalytic converters.

Please give me a call if you have any questions.

- Kevin

Burriss03 · 04-20-2015, 06:02 PM

Thanks guys for the answer! I'm glad..now to the second part of my question. How beneficial will an UpRev tune be for this setup?

SwissCheese · 04-20-2015, 08:14 PM

Quote:

Originally Posted by Burriss03

Thanks guys for the answer! I'm glad..now to the second part of my question. How beneficial will an UpRev tune be for this setup?

You'll definitely see benefits from a tune.

Rusty · 04-20-2015, 08:14 PM

The tune will smooth out the bumps in the power band, A/F ratio, and a few ponies on top. You'll also increase fuel mileage, ONLY if you keep your foot off of the loud pedal. When you get the tune. Don't raise the rev limiter, and have the fans kick on sooner.

Burriss03 · 04-20-2015, 08:25 PM

Quote:

Originally Posted by Rusty

The tune will smooth out the bumps in the power band, A/F ratio, and a few ponies on top. You'll also increase fuel mileage, ONLY if you keep your foot off of the loud pedal. When you get the tune. Don't raise the rev limiter, and have the fans kick on sooner.

Yeah I've noticed a few little spots where there seems to be a lag in the throttle. Not bad but I've noticed it. Thanks for the advice! Was thinking of taking it to Z1 Motorsports, if you've heard of them?...

maggotcorps · 06-18-2015, 01:13 PM

Quote:

Originally Posted by Burriss03

Was thinking of taking it to Z1 Motorsports, if you've heard of them?...

.... was that a serious question? please let that be sarcasm lol

Elmo370z · 06-18-2015, 03:24 PM

Newbee

ZWig22 · 06-18-2015, 04:25 PM

Quote:

Originally Posted by maggotcorps

.... was that a serious question? please let that be sarcasm lol

My thought exactly ^^

09MB370Z · 06-19-2015, 12:26 AM

Normal for the motor.

/thread

04-20-2015, 05:15 PM	#1 (permalink)
Burriss03 Base Member Join Date: Mar 2012 Location: Macon Posts: 65 Drives: Black 09 Sport M6 Rep Power: 13	Weird Hissing/Air Noise?? Don't know if this has ever been discussed before but i have a question. OK this is my setup: -Stillen Gen 3 intakes -FI non-resonated exhaust -FI test pipes I had the exhaust for about year, i then still wanted it louder. So after I installed the FI test pipes, there was an immediate hissing type of noise when u let off the gas, it sounds like pressure releasing or something of that nature. Is this normal or has anyone ever had this same thing? Also, could it be that I need to get the car tuned after having all that done? Any help would be awesome. Thanks!

04-20-2015, 05:22 PM	#2 (permalink)
Chuck33079 A True Z Fanatic Join Date: Nov 2011 Location: Houston Posts: 12,265 Drives: 2011 370ztt Rep Power: 29538	It's normal with this motor. __________________ 2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

04-20-2015, 05:40 PM	#3 (permalink)
dP3NGU1N A True Z Fanatic Join Date: Feb 2011 Location: Irvine Posts: 1,682 Drives: 13 PW sport 6mt Rep Power: 18	happens with VQ engines. HFCs and test pipes will make the noise. Sales@F.I. Inc. likes this. __________________ 35% Hooper Optik \| Takeda Attack CAI \| F.I. HFC \| Hotchkis Sway Bar \| Stillen 24row \| OS Giken Super Lock LSD \| TK Shift Knob \| EVO-R Carbon Diffuser

04-20-2015, 05:57 PM	#5 (permalink)
Sales@F.I. Inc. The370Z.com Sponsor Join Date: Feb 2013 Location: Simi Valley, Ca. Posts: 426 Drives: 2008 G37S Coupe Rep Power: 9218	OP: It is quite normal to hear a hissing sound on deceleration once adding high flow cats or test pipes. It is the natural harmonic of the VQ37VHR motor. The sound is more prominent once you remove your restrictive OEM catalytic converters. Please give me a call if you have any questions. - Kevin __________________ *Follow us on Facebook: Fast Intentions Inc. / Instagram: @FastIntentions* Phone: (805) 522-FAST (3278) Email: kevin@fastintentions.com www.fastintentions.com "FUELED BY PASSION"

04-20-2015, 08:14 PM	#8 (permalink)
Rusty Ronin Samurai - Assassin Join Date: Dec 2011 Location: Fayettenam,Pennsyltucky Age: 68 Posts: 34,865 Drives: 2011 Nismo GM 6M Rep Power: 2684436	The tune will smooth out the bumps in the power band, A/F ratio, and a few ponies on top. You'll also increase fuel mileage, ONLY if you keep your foot off of the loud pedal. When you get the tune. Don't raise the rev limiter, and have the fans kick on sooner. __________________ 浪人 - 殺し屋 "The Difficult Anytime, The Impossible By Appointment Only" http://www.the370z.com/members-370z-...o-journal.html

04-20-2015, 06:02 PM	#6 (permalink)
Burriss03 Base Member Join Date: Mar 2012 Location: Macon Posts: 65 Drives: Black 09 Sport M6 Rep Power: 13	Thanks guys for the answer! I'm glad..now to the second part of my question. How beneficial will an UpRev tune be for this setup?

06-18-2015, 03:24 PM	#11 (permalink)
Elmo370z A True Z Fanatic Join Date: Apr 2013 Location: st. petersburg Posts: 5,707 Drives: 09 nissan 370z Sp M6 Rep Power: 295378	Newbee

06-19-2015, 12:26 AM	#13 (permalink)
09MB370Z Base Member Join Date: Oct 2014 Location: Southern California Posts: 19 Drives: 2009 Nissan 370Z Rep Power: 10	Normal for the motor. /thread

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Weird Noise	jwomack1547	Intake/Exhaust	10	10-27-2014 09:25 PM
What's this Weird Noise?	critical	Brakes & Suspension	30	01-01-2014 12:23 AM
Hissing noise from 370z aftermarket exhaust system	ERZperformance	Intake/Exhaust	25	08-26-2010 09:59 AM
Weird noise around 4k rpm	gh0st3794	Engine & Drivetrain	13	06-15-2010 07:53 PM
7AT weird noise. Do you have this too?	Juruki	Engine & Drivetrain	7	04-30-2010 12:46 AM