Berk HFC's + Stillen CBE = RAAAAAAASSSSPPPPP

atx370z · 10-26-2010, 01:40 AM

Ok, so i thought i would learn to live with it, but it's starting to get really annoying. It doesn't sound good at all and it's VERY loud.

At anything over 1/4 throttle between about 3700 and 5000 rpm there is a BB's in a tin can raspiness that the exhaust produces that is borderline embarrassing it sounds so horrible. Is there any way to tame this by the addition of resonators or is it just the nature of the beast? If there is any exhaust on the market that produces no rasp when matched up with Berk HFC's .... im sold.

Thanks!

BOLIO 671 · 10-26-2010, 07:24 AM

I find this really suprising...You are probably the first person with this combo that has complained about this paired set up.

JohnnyBgood · 10-26-2010, 08:41 AM

I have the exact same set up. I only get a little rasp until it warms up, then I get none at all. Are you sure you don't have a pin hole leak somewhere?

m4a1mustang · 10-26-2010, 08:42 AM

Fast Intentions.

fuct · 10-26-2010, 08:43 AM

is anything loose or touching?

Marcus Ryan · 10-26-2010, 09:14 AM

Funny, I've got the Stillen CBE installed and I'm waiting on the HFC's to come in the mail.

Have you watched any of the videos online of this setup? There seems to be almost zero rasp at all from what I can tell.

One thing though - When I first got the catback installed, there was a rattle coming from the deadeners attached to it that could have been mistaken for rasp. I went and bent it back off of the pipe and that got rid of it.

red6spd · 10-26-2010, 09:17 AM

Quote:

Originally Posted by fuct

is anything loose or touching?

I agree. Make sure theres no leaks and nothing is touching. That combo should not give you much rasp, and trust me I know about rasp FI CBE Non Resonated + FI Non Resonated TP. LOL

m4a1mustang · 10-26-2010, 09:18 AM

Oh these things have a bit of rasp up top. One of our members here running Stillen headers + HFCs + CBE has a crap ton of rasp.

RCZ · 10-26-2010, 09:35 AM

is your exhaust touching the crossmember by any chance? If not, sounds like a leak.

I have Stillen headers, HFC and catback and I have very little rasp.

TBSS2008 · 10-26-2010, 11:48 AM

I had a small leak in my Invidia Gemini exhaust and it was very loud, in a bad way, very raspy. Once I got it fixed I couldn't believe how much nicer my the Z sounds.

tjlazer · 10-26-2010, 12:07 PM

Man am I glad to not have any rasp with my current setup! I hate it too...

atx370z · 10-26-2010, 02:52 PM

I checked the u-bolts.. they are all very tight. The bolted connections look good. The crossmember was touching, but i fixed that right away when i first got the exhaust installed.

There's no rasp unless i give it half to full throttle and its only for about 1k to 2k rpm's right in the middle of the rpm range. Up top theres no rasp. Its pretty gnarly rasp too.

I got a video of a dyno run ill try and upload. Not sure how good you can hear it, though. The quality sucks. Taken with iPhone.

atx370z · 10-26-2010, 03:14 PM

Listen here - http://www.youtube.com/watch?v=vUHanRmrRa0

If you listen close, you can here the rasp starts at around 4k rpm for about 2 seconds then it goes away at about 5k-5.5k rpm until redline

atx370z · 10-26-2010, 03:16 PM

nevermind, just watched it and can't hear ****. DAMNIT!

Bottom line... its very loud and noticeable. Ill triple check for leaks.

Thanks for all the help and suggestions!

spearfish25 · 10-26-2010, 04:26 PM

My setup was very raspy when the HFCs were first installed and then everything settled down in a few hundred miles. There's still a bit of rasp that JB1 noticed last weekend, but I really can't hear it anymore. 100% better than when the HFCs first went on though. Maybe you need to give it a little time to settle in.

10-26-2010, 01:40 AM	#1 (permalink)
atx370z Track Member Join Date: Aug 2010 Location: Austin, TX Posts: 637 Drives: 10 370Z T/S M6 Rep Power: 15	Berk HFC's + Stillen CBE = RAAAAAAASSSSPPPPP Ok, so i thought i would learn to live with it, but it's starting to get really annoying. It doesn't sound good at all and it's VERY loud. At anything over 1/4 throttle between about 3700 and 5000 rpm there is a BB's in a tin can raspiness that the exhaust produces that is borderline embarrassing it sounds so horrible. Is there any way to tame this by the addition of resonators or is it just the nature of the beast? If there is any exhaust on the market that produces no rasp when matched up with Berk HFC's .... im sold. Thanks! __________________ Berk HFC & CBE, Stillen G3's, AMS Crank Pulley, JWT Flywheel, 4.08 Gears, UpRev, H&R Springs and 20mm Spacers, JDM Rear Fog, EVO-R Front Lip and CF Upper Cover, 305's

10-26-2010, 07:24 AM	#2 (permalink)
BOLIO 671 A True Z Fanatic Join Date: Mar 2010 Location: GUAHAN Posts: 1,198 Drives: To & From then Back Rep Power: 3399	I find this really suprising...You are probably the first person with this combo that has complained about this paired set up. __________________ 2013 Nismo Z34 / FI TT #091 / IG: @lilzilla_z34

10-26-2010, 08:42 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	Fast Intentions. __________________ - Steve Zs & Coffee - Saturdays at 10AM in Fairfax, VA and Columbia, MD (Click the banner!) LIKE us on Facebook!

10-26-2010, 09:18 AM	#8 (permalink)
m4a1mustang A True Z Fanatic Join Date: Feb 2009 Location: Northern VA Posts: 55,385 Drives: on two wheels Rep Power: 6962	Oh these things have a bit of rasp up top. One of our members here running Stillen headers + HFCs + CBE has a crap ton of rasp. __________________ - Steve Zs & Coffee - Saturdays at 10AM in Fairfax, VA and Columbia, MD (Click the banner!) LIKE us on Facebook!

10-26-2010, 11:48 AM	#10 (permalink)
TBSS2008 Base Member Join Date: Apr 2009 Location: Texas Posts: 195 Drives: 11 Corvette GS 6spd Rep Power: 16	I had a small leak in my Invidia Gemini exhaust and it was very loud, in a bad way, very raspy. Once I got it fixed I couldn't believe how much nicer my the Z sounds. __________________ 2011 Black Corvette Grand Sport 6spd \| NNP Daul Mode Exhaust 2008 Trail Blazer SS Black \| SuperChips Tune 2009 370Z Black 7AT Touring Sport (TRADED)

10-26-2010, 08:41 AM	#3 (permalink)
JohnnyBgood Base Member Join Date: Mar 2009 Location: Austin Posts: 55 Drives: 2016 Sport Tech 7AT Rep Power: 16	I have the exact same set up. I only get a little rasp until it warms up, then I get none at all. Are you sure you don't have a pin hole leak somewhere?

10-26-2010, 08:43 AM	#5 (permalink)
fuct A True Z Fanatic Join Date: May 2009 Location: Sugar Land Posts: 3,692 Drives: 97' Ranger :) Rep Power: 23	is anything loose or touching?

10-26-2010, 09:14 AM	#6 (permalink)
Marcus Ryan Base Member Join Date: Mar 2010 Location: Dallas Posts: 77 Drives: 2010 370Z M6 40th Rep Power: 15	Funny, I've got the Stillen CBE installed and I'm waiting on the HFC's to come in the mail. Have you watched any of the videos online of this setup? There seems to be almost zero rasp at all from what I can tell. One thing though - When I first got the catback installed, there was a rattle coming from the deadeners attached to it that could have been mistaken for rasp. I went and bent it back off of the pipe and that got rid of it.

10-26-2010, 09:35 AM	#9 (permalink)
RCZ A True Z Fanatic Join Date: Nov 2008 Location: Miami Posts: 6,403 Drives: '09 370Z Rep Power: 1118	is your exhaust touching the crossmember by any chance? If not, sounds like a leak. I have Stillen headers, HFC and catback and I have very little rasp.

10-26-2010, 12:07 PM	#11 (permalink)
tjlazer A True Z Fanatic Join Date: Dec 2009 Location: Tacoma Age: 52 Posts: 2,496 Drives: Z34, R35 Rep Power: 19	Man am I glad to not have any rasp with my current setup! I hate it too... __________________ 2009 370Z Monterey Blue,Nismo Conversion,RE-11's, K&N Typhoon intakes,Blue Kickplates,Homelink,FI 18" CBE,ERZ HFCs,Hotchkis sways, Swift Spec-R, EVO-R Highwing, UPREV

10-26-2010, 02:52 PM	#12 (permalink)
atx370z Track Member Join Date: Aug 2010 Location: Austin, TX Posts: 637 Drives: 10 370Z T/S M6 Rep Power: 15	I checked the u-bolts.. they are all very tight. The bolted connections look good. The crossmember was touching, but i fixed that right away when i first got the exhaust installed. There's no rasp unless i give it half to full throttle and its only for about 1k to 2k rpm's right in the middle of the rpm range. Up top theres no rasp. Its pretty gnarly rasp too. I got a video of a dyno run ill try and upload. Not sure how good you can hear it, though. The quality sucks. Taken with iPhone. __________________ Berk HFC & CBE, Stillen G3's, AMS Crank Pulley, JWT Flywheel, 4.08 Gears, UpRev, H&R Springs and 20mm Spacers, JDM Rear Fog, EVO-R Front Lip and CF Upper Cover, 305's

10-26-2010, 03:14 PM	#13 (permalink)
atx370z Track Member Join Date: Aug 2010 Location: Austin, TX Posts: 637 Drives: 10 370Z T/S M6 Rep Power: 15	Listen here - http://www.youtube.com/watch?v=vUHanRmrRa0 If you listen close, you can here the rasp starts at around 4k rpm for about 2 seconds then it goes away at about 5k-5.5k rpm until redline __________________ Berk HFC & CBE, Stillen G3's, AMS Crank Pulley, JWT Flywheel, 4.08 Gears, UpRev, H&R Springs and 20mm Spacers, JDM Rear Fog, EVO-R Front Lip and CF Upper Cover, 305's

10-26-2010, 03:16 PM	#14 (permalink)
atx370z Track Member Join Date: Aug 2010 Location: Austin, TX Posts: 637 Drives: 10 370Z T/S M6 Rep Power: 15	nevermind, just watched it and can't hear ****. DAMNIT! Bottom line... its very loud and noticeable. Ill triple check for leaks. Thanks for all the help and suggestions! __________________ Berk HFC & CBE, Stillen G3's, AMS Crank Pulley, JWT Flywheel, 4.08 Gears, UpRev, H&R Springs and 20mm Spacers, JDM Rear Fog, EVO-R Front Lip and CF Upper Cover, 305's

10-26-2010, 04:26 PM	#15 (permalink)
spearfish25 A True Z Fanatic Join Date: Mar 2009 Location: Naples, FL Posts: 4,117 Drives: to work Rep Power: 1856	My setup was very raspy when the HFCs were first installed and then everything settled down in a few hundred miles. There's still a bit of rasp that JB1 noticed last weekend, but I really can't hear it anymore. 100% better than when the HFCs first went on though. Maybe you need to give it a little time to settle in. __________________ 2013 Cadillac V-Wagon, RIP Z

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