Need help diagnosing a problem.

GoBoost · 09-28-2010, 10:15 AM

Here's the scoop. I had previously installed Stillen G3 intakes, and a stillen exhaust. the car ran great, but wasnt loud enough for me. I decided to increase the sound by going with Berk HFC's. I knew about the 'demon bolts' and decided to go straight to a shop for the install. Anyhow, as soon as I heard the car start up after the install, i thought to myself "this is NOT how this car is supposed to sound". I told the guy that installed them, and he assured me i'd be ok.

I did feel under the car to see if I could feel an exhaust leak, but I could only feel the warmth of the pipe, and no exhaust. You can hear in the video the car hisses at just below 2k rpms. I've heard other people say they get a huge power increase from Berk's HFCs but honestly I felt no change, or maybe even a drop.

Anyhow, I dont have anyone else with me to do isolation tests to figure it out, so I thought i'd take some video, and see if any of you with all your expertise could help me pinpoint what would cause this problem.

On to the videos.

m4a1mustang · 09-28-2010, 10:25 AM

Totally normal!

When you open up the exhaust with HFCs or test pipes you get the hiss. All the crossover pipe systems do it.

It's not a problem... it just is what it is.

GoBoost · 09-28-2010, 10:28 AM

^Oh really? That's surprising to hear. I was basing mine from other cars i've seen on youtube (which I know not all cameras pick up sound the same) with the same mods. Anyhow, the other cars seemed to sound deeper, without the hiss.

m4a1mustang · 09-28-2010, 10:31 AM

It varies from exhaust to exhaust, but any system on the 370 that has a crossover pipe is going to have a bit of a hiss. The hiss is amplified with HFCs or test pipes.

6MT · 09-28-2010, 10:31 AM

Quote:

Originally Posted by m4a1mustang

Totally normal!

When you open up the exhaust with HFCs or test pipes you get the hiss. All the crossover pipe systems do it.

It's not a problem... it just is what it is.

Mine has the same hiss when decelerating. Normal.

GoBoost · 09-28-2010, 10:41 AM

Thanks guys for your input! I was worrying there =)

vipor · 09-28-2010, 10:42 AM

Nismo H-Pipe + FI LTH's = lots of hiss, LOTS

F1loco · 09-28-2010, 12:04 PM

TP's and yes same HISS...VQ trademark I guess...

christian370z · 09-28-2010, 12:27 PM

I doubt you lost any power whatsoever, but the power increase would not be as noticeable with your other breathing mods. The hiss is definately not unique, I can't think of any exhaust I have heard on the 370z that has been able to completely get rid of it.

craniac24 · 09-28-2010, 11:18 PM

What's with your tips dude? Did you cut the rolls and burn them or something?

craniac24 · 09-28-2010, 11:28 PM

Also...is that moisture leaking down from one of the joints in the exhaust? I'm guessing that wouldn't be a good thing...

SE · 09-29-2010, 12:30 AM

Quote:

Originally Posted by craniac24

Also...is that moisture leaking down from one of the joints in the exhaust? I'm guessing that wouldn't be a good thing...

I couldn't watch the video but unless your car was wet recently you shouldn't have moisture dripping from any flange. If you have moisture coming down from a flange typically it's a sign of an improperly secured one.

ncheung85 · 09-29-2010, 01:16 AM

what is that ? the bits of stuff flying out from your exhaust on the 1st video at 14sec.

CBRich · 09-29-2010, 06:26 AM

I've also got the hiss. Totally normal.

Vegitto-kun · 09-29-2010, 06:33 AM

you should be happy your car only does the hiss around 2000ish mine does it whenever I let go off the throttle.

freeflow exhaust = drone and hissing man.

09-28-2010, 10:15 AM	#1 (permalink)
GoBoost Base Member Join Date: Apr 2010 Location: Cabot, AR Posts: 51 Drives: '08 Evo X Rep Power: 15	Need help diagnosing a problem. Here's the scoop. I had previously installed Stillen G3 intakes, and a stillen exhaust. the car ran great, but wasnt loud enough for me. I decided to increase the sound by going with Berk HFC's. I knew about the 'demon bolts' and decided to go straight to a shop for the install. Anyhow, as soon as I heard the car start up after the install, i thought to myself "this is NOT how this car is supposed to sound". I told the guy that installed them, and he assured me i'd be ok. I did feel under the car to see if I could feel an exhaust leak, but I could only feel the warmth of the pipe, and no exhaust. You can hear in the video the car hisses at just below 2k rpms. I've heard other people say they get a huge power increase from Berk's HFCs but honestly I felt no change, or maybe even a drop. Anyhow, I dont have anyone else with me to do isolation tests to figure it out, so I thought i'd take some video, and see if any of you with all your expertise could help me pinpoint what would cause this problem. On to the videos. __________________ I <3 Evos

09-28-2010, 10:25 AM	#2 (permalink)
m4a1mustang A True Z Fanatic Join Date: Feb 2009 Location: Northern VA Posts: 55,385 Drives: on two wheels Rep Power: 6962	Totally normal! When you open up the exhaust with HFCs or test pipes you get the hiss. All the crossover pipe systems do it. It's not a problem... it just is what it is. __________________ - Steve Zs & Coffee - Saturdays at 10AM in Fairfax, VA and Columbia, MD (Click the banner!) LIKE us on Facebook!

09-28-2010, 10:28 AM	#3 (permalink)
GoBoost Base Member Join Date: Apr 2010 Location: Cabot, AR Posts: 51 Drives: '08 Evo X Rep Power: 15	^Oh really? That's surprising to hear. I was basing mine from other cars i've seen on youtube (which I know not all cameras pick up sound the same) with the same mods. Anyhow, the other cars seemed to sound deeper, without the hiss. __________________ I <3 Evos

09-28-2010, 10:31 AM	#4 (permalink)
m4a1mustang A True Z Fanatic Join Date: Feb 2009 Location: Northern VA Posts: 55,385 Drives: on two wheels Rep Power: 6962	It varies from exhaust to exhaust, but any system on the 370 that has a crossover pipe is going to have a bit of a hiss. The hiss is amplified with HFCs or test pipes. __________________ - Steve Zs & Coffee - Saturdays at 10AM in Fairfax, VA and Columbia, MD (Click the banner!) LIKE us on Facebook!

09-28-2010, 10:41 AM	#6 (permalink)
GoBoost Base Member Join Date: Apr 2010 Location: Cabot, AR Posts: 51 Drives: '08 Evo X Rep Power: 15	Thanks guys for your input! I was worrying there =) __________________ I <3 Evos

09-28-2010, 10:42 AM	#7 (permalink)
vipor A True Z Fanatic Join Date: Aug 2009 Location: Euless, TX [ DFW ] Age: 41 Posts: 13,531 Drives: Nismo 09-0183 QAB Rep Power: 48	Nismo H-Pipe + FI LTH's = lots of hiss, LOTS __________________ 2009 NISMO # 0193 \| QAB \| Albums! \| 05.04.10 (Dynojet) 291.94hp/248.28tq Oil Cooler (DIY) \| Custom Headlights \| GTSPEC Braces \| F.I. Long Tube Headers

09-28-2010, 12:04 PM	#8 (permalink)
F1loco Base Member Join Date: Jul 2010 Location: Sunshine Posts: 203 Drives: 09 Nismo Rep Power: 14	TP's and yes same HISS...VQ trademark I guess...

09-28-2010, 12:27 PM	#9 (permalink)
christian370z A True Z Fanatic Join Date: Jul 2010 Location: Newport Beach Posts: 3,900 Drives: 2010 370Z/Saab 900se Rep Power: 431	I doubt you lost any power whatsoever, but the power increase would not be as noticeable with your other breathing mods. The hiss is definately not unique, I can't think of any exhaust I have heard on the 370z that has been able to completely get rid of it. __________________ -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

09-28-2010, 11:18 PM	#10 (permalink)
craniac24 Enthusiast Member Join Date: Mar 2010 Location: Ronkonkoma, NY Posts: 339 Drives: 2010 PG Roadster Rep Power: 402	What's with your tips dude? Did you cut the rolls and burn them or something? __________________ 2010 6MT PG Roadster w/Sport & NAV. Stillen Exhaust, Stillen GIII Intake, Eibach Springs, H&R Spacers 15f/20r, SPC Rear Camber Kit. Thanks to Vinny Ten Racing!

09-28-2010, 11:28 PM	#11 (permalink)
craniac24 Enthusiast Member Join Date: Mar 2010 Location: Ronkonkoma, NY Posts: 339 Drives: 2010 PG Roadster Rep Power: 402	Also...is that moisture leaking down from one of the joints in the exhaust? I'm guessing that wouldn't be a good thing... __________________ 2010 6MT PG Roadster w/Sport & NAV. Stillen Exhaust, Stillen GIII Intake, Eibach Springs, H&R Spacers 15f/20r, SPC Rear Camber Kit. Thanks to Vinny Ten Racing!

09-29-2010, 01:16 AM	#13 (permalink)
ncheung85 Enthusiast Member Join Date: Feb 2010 Location: Alhambra, CA Posts: 339 Drives: z Rep Power: 15	what is that ? the bits of stuff flying out from your exhaust on the 1st video at 14sec. __________________ Injen \| Berk \| HKS \| Hotchkis \| Gtspec \| EVO-R \| Forgestar \| KW \| SPC \| Uprev Youtube

09-29-2010, 06:26 AM	#14 (permalink)
CBRich A True Z Fanatic Join Date: Apr 2009 Location: SC Posts: 2,464 Drives: 370Z Rep Power: 544	I've also got the hiss. Totally normal.

09-29-2010, 06:33 AM	#15 (permalink)
Vegitto-kun A True Z Fanatic Join Date: Feb 2010 Location: USA Posts: 2,011 Drives: 09 370Z Rep Power: 262	you should be happy your car only does the hiss around 2000ish mine does it whenever I let go off the throttle. freeflow exhaust = drone and hissing man.

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