I need some help...

ZCRUZIN · 03-04-2014, 10:10 PM

NEED HELP: I recently added Fast Intentions exhaust with 12" resonators to my 370Z along with installing the Stillen Gen 3 and everything sounded fine. It was certainly a deeper sound in the cab and all of that, but it sounded good to me without any rattles etc.

Today, I had my test pipes installed, and now there is a hissing/rattle sound that's primarily on the down rev side. Sometimes on a hard up rev I can hear it but it is consistent on the down rev side. It's like the sound is from inside the exhaust, not like something rattling on the outside such as an exhaust hanger and such. It almost sounds to me like there's a piece of metal or something inside the exhaust that's causing the hiss/rattle. Any ideas what it may be?

Thanks for your help in advance!

Rangerz · 03-04-2014, 10:16 PM

The VQ hiss is normal and is amplified withe the gen 3 and FI. This occurs on deceleration wheather under load or not. A rattle is something you will have to narrow down. Loose heat sheild or something similar possibly.

COSMO · 03-04-2014, 10:19 PM

Are the test pipes hollow or high flow cats? If hfc it could be something loose inside. Chances are you just need to get back under there and have someone rev it up so you can pin point where it is coming from.. Can't wait to hear it man!!!

ZCRUZIN · 03-04-2014, 10:26 PM

Thanks for the replies. I want to add that I never heard anything like this with the Gen 3 and Fast Intentions fatback installed. I only heard this once the cats were removed and test pipes installed. They are straight test pipes with no resonators and they are hfc. The only resonators I have are the 12" resonators on midsection.

jwick · 03-04-2014, 10:34 PM

Quote:

Originally Posted by Rangerz

The VQ hiss is normal and is amplified withe the gen 3 and FI. This occurs on deceleration wheather under load or not. A rattle is something you will have to narrow down. Loose heat sheild or something similar possibly.

Hiss is status quo when you remove factory cats. Kind of like the flywheel chatters a lot. Normal for the platform.

Gibby1113 · 03-05-2014, 12:18 AM

You may wanna check if all the gaskets are on right and there aren't any leaks. Other than that you're good. Test pipes tend to make the car hiss. FI exhaust has a hiss to it. Add test pipes and you got yourself a hissing machine that sounds glorious

03-04-2014, 10:10 PM	#1 (permalink)
ZCRUZIN Base Member Join Date: Dec 2013 Location: Hattiesburg, MS Posts: 25 Drives: 09 Nissan 370Z BK M6 Rep Power: 11	I need some help... NEED HELP: I recently added Fast Intentions exhaust with 12" resonators to my 370Z along with installing the Stillen Gen 3 and everything sounded fine. It was certainly a deeper sound in the cab and all of that, but it sounded good to me without any rattles etc. Today, I had my test pipes installed, and now there is a hissing/rattle sound that's primarily on the down rev side. Sometimes on a hard up rev I can hear it but it is consistent on the down rev side. It's like the sound is from inside the exhaust, not like something rattling on the outside such as an exhaust hanger and such. It almost sounds to me like there's a piece of metal or something inside the exhaust that's causing the hiss/rattle. Any ideas what it may be? Thanks for your help in advance! __________________ 2009 370Z w/ Sport Package * Red GTR Start Button * GTR Clear Dome Light Lenses * Stillen Gen 3 CAI * Fast Intentions Exhaust w/ 12" Resonators * Z1 SS Test Pipes * Kinetix Camber Kit Front & Rear * SPC Toe Bolts * Z1 Silicone Hoses *

03-04-2014, 10:16 PM	#2 (permalink)
Rangerz Enthusiast Member Join Date: Jun 2013 Location: Northern Utah Age: 59 Posts: 476 Drives: 2012 370 Nismo Rep Power: 12	The VQ hiss is normal and is amplified withe the gen 3 and FI. This occurs on deceleration wheather under load or not. A rattle is something you will have to narrow down. Loose heat sheild or something similar possibly. Gibby1113 and ZCRUZIN like this. __________________ Stillen Gen III/ NST/ Fast Intentions Non-Res HFC & 12" Resonated CF TDX/ Setreb series 9 OC/ SPL upper control arms/ Whiteline front & rear swaybars/ Uprev tuned by Seb@specialtyZ/ 319HP 262TQ/ Z1 PS Cooler/ Z1 SS Premium break lines/ CJM Road Race pump/Carbotech F:XP10 R:XP8 Nismo OC DIY

03-04-2014, 10:19 PM	#3 (permalink)
COSMO A True Z Fanatic Join Date: Dec 2012 Location: FL Posts: 1,816 Drives: 2012 Touring GTM TT Rep Power: 19	Are the test pipes hollow or high flow cats? If hfc it could be something loose inside. Chances are you just need to get back under there and have someone rev it up so you can pin point where it is coming from.. Can't wait to hear it man!!! ZCRUZIN likes this.

03-04-2014, 10:26 PM	#4 (permalink)
ZCRUZIN Base Member Join Date: Dec 2013 Location: Hattiesburg, MS Posts: 25 Drives: 09 Nissan 370Z BK M6 Rep Power: 11	Thanks for the replies. I want to add that I never heard anything like this with the Gen 3 and Fast Intentions fatback installed. I only heard this once the cats were removed and test pipes installed. They are straight test pipes with no resonators and they are hfc. The only resonators I have are the 12" resonators on midsection. __________________ 2009 370Z w/ Sport Package * Red GTR Start Button * GTR Clear Dome Light Lenses * Stillen Gen 3 CAI * Fast Intentions Exhaust w/ 12" Resonators * Z1 SS Test Pipes * Kinetix Camber Kit Front & Rear * SPC Toe Bolts * Z1 Silicone Hoses *

03-05-2014, 12:18 AM	#6 (permalink)
Gibby1113 Enthusiast Member Join Date: Nov 2012 Location: On open empty highways Posts: 366 Drives: 40th anniversary Rep Power: 13	You may wanna check if all the gaskets are on right and there aren't any leaks. Other than that you're good. Test pipes tend to make the car hiss. FI exhaust has a hiss to it. Add test pipes and you got yourself a hissing machine that sounds glorious __________________ 40th anniversary #450/1000 \| Takeda Attack CAI \| Ark DTS exhaust \| to be continued...