JWT pop chargers, Berk HFCs, and Stillen Catback.....raspy...

mattkim85 · 04-29-2009, 04:29 AM

my setup is jwt popcharger, berk hfcs, and stillen catback

as soon as i installed the hfcs there was a raspy sound during mild throttle.
i thought it might be a loose bolt and got the mechs at stillen to check it out during the stillen catback install. everything checked out fine and was informed that hfcs tend to have a raspy sound. Well after a couple weeks of driving around hoping the raspiness will die down... the sound keeps getting worse.. I guess the exhaust is fully broken-in and it amplifies the raspiness way more.. Anyone know how to get rid of this annoying sound? It is not very pleasant to hear that kind of noise from a new car..

Oh and anyone else notice a hisssss kind of sound when you let off the throttle? i would think its normal to hear a hiss when i
accelerate meaning that it is breathing in air from the intakes but hearing it
while decelerating... didnt make much sense to a newbie like me.

any info would be greatly appreciated

crbn_fbr · 04-29-2009, 04:47 AM

You can pretty much guarantee that the cause of the raspy is the HFCs. This is why I will not put them on mine, raspy is a fear I have. And the intakes probably are the hiss sound you hear, they do make the intake more audible which can have a hiss sound even when letting off the gas

arcticreaver · 04-29-2009, 05:43 AM

Quote:

Originally Posted by crbn_fbr

You can pretty much guarantee that the cause of the raspy is the HFCs. This is why I will not put them on mine, raspy is a fear I have. And the intakes probably are the hiss sound you hear, they do make the intake more audible which can have a hiss sound even when letting off the gas

will it get better over time?

tvfreakazoid · 04-29-2009, 05:54 AM

Can you make vid of how it sounds?

Quote:

Originally Posted by mattkim85

my setup is jwt popcharger, berk hfcs, and stillen catback

as soon as i installed the hfcs there was a raspy sound during mild throttle.
i thought it might be a loose bolt and got the mechs at stillen to check it out during the stillen catback install. everything checked out fine and was informed that hfcs tend to have a raspy sound. Well after a couple weeks of driving around hoping the raspiness will die down... the sound keeps getting worse.. I guess the exhaust is fully broken-in and it amplifies the raspiness way more.. Anyone know how to get rid of this annoying sound? It is not very pleasant to hear that kind of noise from a new car..

Oh and anyone else notice a hisssss kind of sound when you let off the throttle? i would think its normal to hear a hiss when i
accelerate meaning that it is breathing in air from the intakes but hearing it
while decelerating... didnt make much sense to a newbie like me.

any info would be greatly appreciated

ssqpolo · 04-29-2009, 12:00 PM

Ive listened to a Z with HFCs, CBE, and the G3 intakes, and there was no rasp. check out semtex's videos, you can see. I have test pipes, and there is a little rasp. there is also a hiss too when u drop in revs, no worries.

crbn_fbr · 04-29-2009, 12:26 PM

Semtex sounds to have a little to me. Guess it is more noticable to others and some not. Plus he did say it was after the hfc install. If it sounds raspy to you now, then no it will not sound much different later to you.

semtex · 04-29-2009, 02:36 PM

Matt, have you checked to make sure the exhaust isn't in contact with the lower crossmember? It's possible that you're mistaking rattle for rasp, as they don't sound entirely different from one another. Do you know which crossmember I'm talking about? Here's a pic, just in case. If that pipe comes into contact with the crossmember, it will resonate pretty significantly.

mattkim85 · 04-29-2009, 03:12 PM

[QUOTE=semtex;65069]Matt, have you checked to make sure the exhaust isn't in contact with the lower crossmember? It's possible that you're mistaking rattle for rasp, as they don't sound entirely different from one another. Do you know which crossmember I'm talking about? Here's a pic, just in case. If that pipe comes into contact with the crossmember, it will resonate pretty significantly.

i was informed by the mechanic at stillen's shop that it cleared the crossmember just fine. It definitely is not a rattle.. im pretty sure..

semtex · 04-29-2009, 03:21 PM

[QUOTE=mattkim85;65090]

Quote:

Originally Posted by semtex

Matt, have you checked to make sure the exhaust isn't in contact with the lower crossmember? It's possible that you're mistaking rattle for rasp, as they don't sound entirely different from one another. Do you know which crossmember I'm talking about? Here's a pic, just in case. If that pipe comes into contact with the crossmember, it will resonate pretty significantly.

i was informed by the mechanic at stillen's shop that it cleared the crossmember just fine. It definitely is not a rattle.. im pretty sure..

Still can't hurt to pop your head under there and check.

Junior370z · 04-29-2009, 03:36 PM

When I installed my stillen exhaust it rest on the brace. I've tried adjusting it but no joy. Anyways it's been on for about a week and I don't hear it rattling. I don't think it the sound he is hearing.

semtex · 04-29-2009, 03:39 PM

Hmm...I don't know then. I mean, it might even be that his exhaust sounds just like mine, except I'm more used to it because I've been running exhausts with HFCs and test pipes for years now. In fact, my 370 sounds less raspy than my 350 because I had test pipes in my 350, not HFCs.

wstar · 04-29-2009, 04:31 PM

I think I'm a bit more rasp-sensitive. I'm used to a V8 sound. Some of the rasp I have now is definitely from a leak though. More than one of my gaskets may be compromised, but at least one is for sure (from playing with the flanges while dealing with the crossmember issue). Stillen and Berk are sending me a complete set of replacement gaskets for everything, so I'll get some new audio and opinion on this issue once I know that's cleared up.

crbn_fbr · 04-30-2009, 03:06 AM

Yes audio helps to see if it sounds like others

Minicobra1 · 04-30-2009, 05:04 AM

I have the hiss on the decel (after HFC install) and the rasp, but the rasp tends to go away the warmer the car gets, after 200 on the oil gauge, it's barely there, a little bit more on WOT, but not bad. It's terrible when the car is first warming up in the morning.

I also noticed this vibration right around 1800-2000 rpm, it goes away past that. when idling if I rev the engine slowly, as it's climbing and get to the 1800rpm mark I get the vibration. It's pretty noticeable when cold, and not as much when warm, but still there. I'll post a video on that later, anyone else have this vibration?? I noticed slightly before the HFC install, but way worse after. I have the Berks & the Nismo CBE.

mattkim85 · 04-30-2009, 05:21 AM

Quote:

Originally Posted by Minicobra1

I have the hiss on the decel (after HFC install) and the rasp, but the rasp tends to go away the warmer the car gets, after 200 on the oil gauge, it's barely there, a little bit more on WOT, but not bad. It's terrible when the car is first warming up in the morning.

I also noticed this vibration right around 1800-2000 rpm, it goes away past that. when idling if I rev the engine slowly, as it's climbing and get to the 1800rpm mark I get the vibration. It's pretty noticeable when cold, and not as much when warm, but still there. I'll post a video on that later, anyone else have this vibration?? I noticed slightly before the HFC install, but way worse after. I have the Berks & the Nismo CBE.

couldnt have said it any better.. that is exactly how it is for me

04-29-2009, 04:29 AM	#1 (permalink)
mattkim85 Base Member Join Date: Dec 2008 Location: los angeles, ca Age: 39 Posts: 230 Drives: 09 Z34, 08 AP2 Rep Power: 16	JWT pop chargers, Berk HFCs, and Stillen Catback.....raspy... my setup is jwt popcharger, berk hfcs, and stillen catback as soon as i installed the hfcs there was a raspy sound during mild throttle. i thought it might be a loose bolt and got the mechs at stillen to check it out during the stillen catback install. everything checked out fine and was informed that hfcs tend to have a raspy sound. Well after a couple weeks of driving around hoping the raspiness will die down... the sound keeps getting worse.. I guess the exhaust is fully broken-in and it amplifies the raspiness way more.. Anyone know how to get rid of this annoying sound? It is not very pleasant to hear that kind of noise from a new car.. Oh and anyone else notice a hisssss kind of sound when you let off the throttle? i would think its normal to hear a hiss when i accelerate meaning that it is breathing in air from the intakes but hearing it while decelerating... didnt make much sense to a newbie like me. any info would be greatly appreciated

04-29-2009, 02:36 PM	#7 (permalink)
semtex A True Z Fanatic Join Date: Jan 2009 Location: Behind enemy lines Age: 54 Posts: 5,995 Drives: People to drink Rep Power: 32	Matt, have you checked to make sure the exhaust isn't in contact with the lower crossmember? It's possible that you're mistaking rattle for rasp, as they don't sound entirely different from one another. Do you know which crossmember I'm talking about? Here's a pic, just in case. If that pipe comes into contact with the crossmember, it will resonate pretty significantly. __________________ "There are no small accidents on this circuit." -- Ayrton Senna 316.8whp & 248 ft/lbs (Dyno Dynamics) \| 319whp & 256 ft/lbs (DynoJet) (04/23/10) Stillen G3 CAI, CBE, Pulley / F.I. LTH / GTSpec Ladder Brace / Setrab Oil Cooler / UpRev-tuned by Forged Perf.

04-29-2009, 03:39 PM	#11 (permalink)
semtex A True Z Fanatic Join Date: Jan 2009 Location: Behind enemy lines Age: 54 Posts: 5,995 Drives: People to drink Rep Power: 32	Hmm...I don't know then. I mean, it might even be that his exhaust sounds just like mine, except I'm more used to it because I've been running exhausts with HFCs and test pipes for years now. In fact, my 370 sounds less raspy than my 350 because I had test pipes in my 350, not HFCs. __________________ "There are no small accidents on this circuit." -- Ayrton Senna 316.8whp & 248 ft/lbs (Dyno Dynamics) \| 319whp & 256 ft/lbs (DynoJet) (04/23/10) Stillen G3 CAI, CBE, Pulley / F.I. LTH / GTSpec Ladder Brace / Setrab Oil Cooler / UpRev-tuned by Forged Perf.

04-29-2009, 04:31 PM	#12 (permalink)
wstar A True Z Fanatic Join Date: Mar 2009 Location: Houston, TX Posts: 4,024 Drives: too slow Rep Power: 3594	I think I'm a bit more rasp-sensitive. I'm used to a V8 sound. Some of the rasp I have now is definitely from a leak though. More than one of my gaskets may be compromised, but at least one is for sure (from playing with the flanges while dealing with the crossmember issue). Stillen and Berk are sending me a complete set of replacement gaskets for everything, so I'll get some new audio and opinion on this issue once I know that's cleared up. __________________ 7AT Track Car! Journal thread / Car setup details

04-30-2009, 05:04 AM	#14 (permalink)
Minicobra1 A True Z Fanatic Join Date: Nov 2008 Location: Orange County, CA. Posts: 1,205 Drives: 370Z Tour, Spt, 6mt Rep Power: 644	I have the hiss on the decel (after HFC install) and the rasp, but the rasp tends to go away the warmer the car gets, after 200 on the oil gauge, it's barely there, a little bit more on WOT, but not bad. It's terrible when the car is first warming up in the morning. I also noticed this vibration right around 1800-2000 rpm, it goes away past that. when idling if I rev the engine slowly, as it's climbing and get to the 1800rpm mark I get the vibration. It's pretty noticeable when cold, and not as much when warm, but still there. I'll post a video on that later, anyone else have this vibration?? I noticed slightly before the HFC install, but way worse after. I have the Berks & the Nismo CBE. __________________ 370z Tour\| Spt Pack\|Navi\|BERK CBE\|Berk HFC's\| Eibach Springs\| Hotchkis Sway Bars\|SPC Camber Arms\|15mm Ichiba Wheel Spacers\| 19"Factory Nismo Wheels-Matt Black\|Stop Tech Rotors\|TWM Shifter\|3M Tint\|Black Fangs\|Black Rear Valance\|JDM Fog Light\| MY BAND-www.myspace.com/petroleum

04-29-2009, 04:47 AM	#2 (permalink)
crbn_fbr Base Member Join Date: Feb 2009 Location: Lex Posts: 96 Drives: 09 370Z, 02 WRX Rep Power: 16	You can pretty much guarantee that the cause of the raspy is the HFCs. This is why I will not put them on mine, raspy is a fear I have. And the intakes probably are the hiss sound you hear, they do make the intake more audible which can have a hiss sound even when letting off the gas

04-29-2009, 12:00 PM	#5 (permalink)
ssqpolo Track Member Join Date: Jan 2009 Location: Florida Posts: 882 Drives: '12 Black Nismo Rep Power: 267	Ive listened to a Z with HFCs, CBE, and the G3 intakes, and there was no rasp. check out semtex's videos, you can see. I have test pipes, and there is a little rasp. there is also a hiss too when u drop in revs, no worries.

04-29-2009, 12:26 PM	#6 (permalink)
crbn_fbr Base Member Join Date: Feb 2009 Location: Lex Posts: 96 Drives: 09 370Z, 02 WRX Rep Power: 16	Semtex sounds to have a little to me. Guess it is more noticable to others and some not. Plus he did say it was after the hfc install. If it sounds raspy to you now, then no it will not sound much different later to you.

04-29-2009, 03:12 PM	#8 (permalink)
mattkim85 Base Member Join Date: Dec 2008 Location: los angeles, ca Age: 39 Posts: 230 Drives: 09 Z34, 08 AP2 Rep Power: 16	[QUOTE=semtex;65069]Matt, have you checked to make sure the exhaust isn't in contact with the lower crossmember? It's possible that you're mistaking rattle for rasp, as they don't sound entirely different from one another. Do you know which crossmember I'm talking about? Here's a pic, just in case. If that pipe comes into contact with the crossmember, it will resonate pretty significantly. i was informed by the mechanic at stillen's shop that it cleared the crossmember just fine. It definitely is not a rattle.. im pretty sure..

04-29-2009, 03:36 PM	#10 (permalink)
Junior370z A True Z Fanatic Join Date: Apr 2009 Location: Las Vegas Age: 50 Posts: 1,024 Drives: over the speed limit Rep Power: 293	When I installed my stillen exhaust it rest on the brace. I've tried adjusting it but no joy. Anyways it's been on for about a week and I don't hear it rattling. I don't think it the sound he is hearing.

04-30-2009, 03:06 AM	#13 (permalink)
crbn_fbr Base Member Join Date: Feb 2009 Location: Lex Posts: 96 Drives: 09 370Z, 02 WRX Rep Power: 16	Yes audio helps to see if it sounds like others

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