OBX Y Pipe: Hiss on coast down???

Jordo! · 04-07-2011, 10:16 PM

Let me begin by saying "ARGHGHGHGHGHGHG!!!!!"

Now, on to my query:

Anyone with the OBX Y pipe notice a somewhat high pitched hiss on coast down around 2.5K?

Not sure if this is an exhaust leak or just a characteristic of the pipe.

Thoughts?

P.S.
ARGHGHGHGHGHGHG!!!!!!

Viera · 04-07-2011, 10:47 PM

Characteristic of the VQ....

Jordo! · 04-07-2011, 10:50 PM

Sorta.

It did this (and rattled) with unreasonated TP's.

Stopped doing this with resonated TP's.

This JUST started following install of the Y pipe.

More thoughts...?

RCZ · 04-08-2011, 12:01 AM

yes, the more you free the path of sound out of the engine, the more you will hear the hiss.

christian370z · 04-08-2011, 12:54 AM

Depends, I had zero hiss with HFCs and the custom Injen exhaust I sold a little while ago. It had a very large resonated X pipe which is what I believe cut the hiss down. My FI exhaust definitely hisses, I plan on wrapping the X pipe section with exhaust wrap to see if that helps.

Jordo! · 04-08-2011, 01:08 AM

Hmmm.... okay. With Nismo S-tune CBE (which includes y pipe) and resonated cats it sounded PERFECT.

With the above, but Y pipe swapped out, hissing like a snake...

Charactersitic of the pipe or can be repaired????

chops · 04-08-2011, 01:35 AM

Quote:

Originally Posted by Jordo!

Hmmm.... okay. With Nismo S-tune CBE (which includes y pipe) and resonated cats it sounded PERFECT.

With the above, but Y pipe swapped out, hissing like a snake...

Charactersitic of the pipe or can be repaired????

Quote:

Originally Posted by Viera

Characteristic of the VQ....

jordo - theres a hiss, but is there any noticeable RASP? i get the hiss with my high flow cats AND a nasty rasp on WOT

Jordo! · 04-08-2011, 03:32 AM

Zero rasp -- just a hiss on coast down and slight hiss on up shift...

Sounds isolated to one side, which makes me think exhaust leak, but this motor is notoriously noisy...

If this is a characteristic of the Y pipe, it's going up for sale -- very annoying to me...

Staples · 04-08-2011, 05:33 AM

I only get an audible hiss when decelerating. If my foot stays on the pedal I don't have any issues. I would check for leaks just to be cautious.

BLM · 04-08-2011, 07:10 AM

Some set-ups have minimal hissing. But the more you free up the exhaust path the more likely you are to get the hissing sound, which as has been stated many times before, is a characteristics of the VQ harmonics and is masked by the factory exhaust set-up

spearfish25 · 04-08-2011, 07:28 AM

Yep, the VQ37 is a cobra.

6spd · 04-08-2011, 07:50 AM

just a side question, why'd you switch out the y-pipe?

GZ3 · 04-08-2011, 09:48 AM

i have a bit of hiss with ART pipes and XYZ...very little....

TonyBPD · 04-08-2011, 01:38 PM

Quote:

Originally Posted by GZ3

i have a bit of hiss with ART pipes and XYZ...very little....

What is the XYZ?

GZ3 · 04-08-2011, 01:45 PM

Quote:

Originally Posted by TonyBPD

What is the XYZ?

its motordyne's Y pipe

04-07-2011, 10:16 PM	#1 (permalink)
Jordo! A True Z Fanatic Join Date: May 2010 Location: nirvana Posts: 6,394 Drives: 2023 NATM Rep Power: 417	OBX Y Pipe: Hiss on coast down??? Let me begin by saying "ARGHGHGHGHGHGHG!!!!!" Now, on to my query: Anyone with the OBX Y pipe notice a somewhat high pitched hiss on coast down around 2.5K? Not sure if this is an exhaust leak or just a characteristic of the pipe. Thoughts? P.S. ARGHGHGHGHGHGHG!!!!!! __________________ Enjoy it. Destroy it.

04-07-2011, 10:47 PM	#2 (permalink)
Viera Track Member Join Date: Feb 2009 Location: Atlanta, GA Posts: 897 Drives: '09 M.Blue 370Z 6MT Rep Power: 264	Characteristic of the VQ.... __________________ Fast Intentions / VarrsToen / Stillen / BC Racing / SPC / K&N / Project Kics / Hankook / Morimoto / JDM Rear Fog

04-07-2011, 10:50 PM	#3 (permalink)
Jordo! A True Z Fanatic Join Date: May 2010 Location: nirvana Posts: 6,394 Drives: 2023 NATM Rep Power: 417	Sorta. It did this (and rattled) with unreasonated TP's. Stopped doing this with resonated TP's. This JUST started following install of the Y pipe. More thoughts...? __________________ Enjoy it. Destroy it. Last edited by Jordo!; 04-07-2011 at 10:52 PM.

04-08-2011, 12:54 AM	#5 (permalink)
christian370z A True Z Fanatic Join Date: Jul 2010 Location: Newport Beach Posts: 3,900 Drives: 2010 370Z/Saab 900se Rep Power: 431	Depends, I had zero hiss with HFCs and the custom Injen exhaust I sold a little while ago. It had a very large resonated X pipe which is what I believe cut the hiss down. My FI exhaust definitely hisses, I plan on wrapping the X pipe section with exhaust wrap to see if that helps. __________________ -320whp / 259wftlbs- SP Rays -- RE-11s -- SpecialtyZ Tune -- Swift Springs -- Stillen 25R Oil Cooler -- Stillen G3 Intakes -- Berk HFCs -- F.I. 12" CBE -- Stillen Sway Bars -- Es14 Spring -- INGS+1 lip -- CF Spoiler -- GTR Start Button -- VLED Parking Lights -- PWJDM V2 shift knob

04-08-2011, 01:08 AM	#6 (permalink)
Jordo! A True Z Fanatic Join Date: May 2010 Location: nirvana Posts: 6,394 Drives: 2023 NATM Rep Power: 417	Hmmm.... okay. With Nismo S-tune CBE (which includes y pipe) and resonated cats it sounded PERFECT. With the above, but Y pipe swapped out, hissing like a snake... Charactersitic of the pipe or can be repaired???? __________________ Enjoy it. Destroy it.

04-08-2011, 12:01 AM	#4 (permalink)
RCZ A True Z Fanatic Join Date: Nov 2008 Location: Miami Posts: 6,403 Drives: '09 370Z Rep Power: 1118	yes, the more you free the path of sound out of the engine, the more you will hear the hiss.

04-08-2011, 03:32 AM	#8 (permalink)
Jordo! A True Z Fanatic Join Date: May 2010 Location: nirvana Posts: 6,394 Drives: 2023 NATM Rep Power: 417	Zero rasp -- just a hiss on coast down and slight hiss on up shift... Sounds isolated to one side, which makes me think exhaust leak, but this motor is notoriously noisy... If this is a characteristic of the Y pipe, it's going up for sale -- very annoying to me... __________________ Enjoy it. Destroy it.

04-08-2011, 05:33 AM	#9 (permalink)
Staples Track Member Join Date: Sep 2010 Location: Baltimore, MD Posts: 546 Drives: '08 Infiniti G37s Rep Power: 15	I only get an audible hiss when decelerating. If my foot stays on the pedal I don't have any issues. I would check for leaks just to be cautious. __________________ '08 Infiniti G37s - Forced Induction Fed

04-08-2011, 07:10 AM	#10 (permalink)
BLM Enthusiast Member Join Date: Feb 2011 Location: NJ Posts: 342 Drives: 2011 Silver M6 sport Rep Power: 14	Some set-ups have minimal hissing. But the more you free up the exhaust path the more likely you are to get the hissing sound, which as has been stated many times before, is a characteristics of the VQ harmonics and is masked by the factory exhaust set-up __________________ K&N // GTM // BERK

04-08-2011, 07:28 AM	#11 (permalink)
spearfish25 A True Z Fanatic Join Date: Mar 2009 Location: Naples, FL Posts: 4,117 Drives: to work Rep Power: 1856	Yep, the VQ37 is a cobra. __________________ 2013 Cadillac V-Wagon, RIP Z

04-08-2011, 07:50 AM	#12 (permalink)
6spd A True Z Fanatic Join Date: Aug 2009 Location: South Florida Posts: 3,001 Drives: Q50RS Rep Power: 24	just a side question, why'd you switch out the y-pipe? __________________ -Jay- jonathanjamesphotographer.com

04-08-2011, 09:48 AM	#13 (permalink)
GZ3 A True Z Fanatic Join Date: Dec 2009 Location: SATX Posts: 3,296 Drives: Z Rep Power: 21	i have a bit of hiss with ART pipes and XYZ...very little.... __________________ 09 GT-R 12' 370Z 7AT HANDED DOWN 12'+13' 5.0 SOLD

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