ARK GRIP + GTM RTP = :mad:

Daishi · 03-22-2011, 01:48 PM

It's the way this engine is designed that makes the hissing noises. It's there stock but can't really be heard because of the restrictiveness of the exhaust. You can lessen/ pretty much eliminate the hissing with better exhaust designs. The x pipe design is going to make the hissing louder but there is a way around it. Again it's all in the design of the exhaust. For example. The fi exhaust comes out of the cats and goes straight into an x pipe. The fi x pipe crossover is very small and creates Alot of hissing through it. I switched over to the invidia exhaust and noticed that the hole in the x pipe is larger to allow more air to crossover and flow with less turbulence. Also there are resonators right before the x pipe on the invidia exhaust to quiet to hissing down. There is virtually no hissing from the invidia exhaust. The fi exhaust hissing was almost unbearable. If companies start to use invidias design or even better use resonated x pipes I believe everyone will be much happier as there will be little to no hiss. I tried telling Tony this at fi only to be told that the different x pipe design would make no difference and that it was a characteristic of this engine and that nothing could be done to change it yet when I switched it made all the difference in the world.

BalanBro · 03-22-2011, 09:01 PM

Quote:

Originally Posted by BLM

From all the videos I've watched it seems that the exhausts that are "true dual" (such as ARK and FI) sound different from those that are constructed off of the OEM Y pipe platform. The latter tend to be a bit more raspy and metallic whereas the true duals are deeper. I can say that my setup sounds totally different from stock in terms of the overall sound. The OEM style y pipe designs tend to sound like a louder version of stock.

However, the rub here seems to be that the true dual systems are more susceptible to the hissing on decel (when a test pipe or HFC is added) than the OEM style systems.

Hoping ARK comes through with their HFC soon to fix this issue. The system is great otherwise.

Yea, ARK told me the same about the HFC. If they can come up with one that fixes the hiss, I'm putting the Berk's up for sale.

BLM · 03-23-2011, 05:14 AM

same here. the eta for the prototype is apparently 8 weeks so I would hope some time during the summer. Either way, the car is making great power. And it sounds great at WOT.

CrownR426 · 03-23-2011, 06:37 PM

I just listened to the sound clip and damn that sucks!
How don't you like that rasp when your car sounds amazing @ WOT.
That is sexy.

One_Quick_Z · 03-23-2011, 06:51 PM

I'm telling you check my thread I have videos and the source of the hissing noise it the X-Pipe.

Dan

BalanBro · 03-23-2011, 07:38 PM

Quote:

Originally Posted by One_Quick_Z

I'm telling you check my thread I have videos and the source of the hissing noise it the X-Pipe.

Dan

Oh yea, we know. It's just that ARK is supposedly working on an HFC design (resonated?) that should solve this issue. Either that or maybe they can offer a true dual replacement center section to replace the x-pipe.

BLM · 03-24-2011, 10:02 AM

I wonder how much the hiss will be decreased with the FI RESONATED HFC? It's kinda price though. I wonder if it would be better to just save the money and go back to the stock cats? I think i'd sacrifice a lot of power though.

cmancha003 · 03-24-2011, 10:38 AM

Just out of curiosity, do you think an H pipe would help in all of this? I haven't seen many of them on the forums but I would think that it would help while also improving performance over the stock cats.

Footloose301 · 03-24-2011, 11:59 AM

FWIW I don't have hiss with my HKS HI POWER TI. However, I have stock cats and stillen G3 intake.

BLM · 03-24-2011, 12:01 PM

The ARK also has no hiss with stock cats either. I'm trying to decide whether it's worth it to switch from my RTP to a resonated hfc or if I should just go back to stock cats. They're so restrictive though. The hfc itself will lessen the hiss but I don't know if adding a resonator to the pipe will eliminate it. Im doubting it. The HFC guys have hiss and I have it with an RTP.

Splinter · 03-24-2011, 03:42 PM

the hiss supposedly comes from too much exhaust flow, so anything that is less restrictive than stock cats will hiss, i think

BLM · 03-24-2011, 05:44 PM

I THINK a Berk HFC/CBE combo doesn't hiss. Idk really. I'll either deal with it or re-install the oem cats. Not gonna pay another $500 plus install for a resonated cat pipe unless I'm sure it will eliminate the hiss. I'll just wait for ARK to release their pipe.

Splinter · 03-24-2011, 11:24 PM

hm i think the berk cbe is designed differently tho, their X section in made by welding 2 pipes bend in a U shape, which would give more volume in the part where the pipes meet for the flow to cross over.

Same here, was looking at the ERZ/CNT HFC or RTP but im worried about the hissing, so i'll wait to see what ARK comes up with.

edit: you can see a pic of the berk cbe in this thread

One_Quick_Z · 03-25-2011, 11:53 AM

Quote:

Originally Posted by BalanBro

Oh yea, we know. It's just that ARK is supposedly working on an HFC design (resonated?) that should solve this issue. Either that or maybe they can offer a true dual replacement center section to replace the x-pipe.

Yes they were working on that months ago when I had their exhaust. I wouldn't hold my breath.

Dan

BLM · 03-25-2011, 11:58 AM

I've been trying to decide if I should just go with the Fast Intention resonated cat pipe ($600 plus install) or simply re-install the stock cats. There's no guarantee the FI pipe will eliminate the rasp. I feel the longer I wait I'll just end up getting used to the sound. Plus, starting in July I will be garaging the car for a year. So at some point in the next 16 months I'm sure ARK will come up with a fix for the rasp.

Quote:

Originally Posted by One_Quick_Z

Yes they were working on that months ago when I had their exhaust. I wouldn't hold my breath.

Dan

How is the rasp/whistle/hiss with your current set-up?

03-22-2011, 01:48 PM	#61 (permalink)
Daishi Track Member Join Date: Jul 2009 Location: NJ Posts: 683 Drives: 09 370z 6Speed Rep Power: 17	It's the way this engine is designed that makes the hissing noises. It's there stock but can't really be heard because of the restrictiveness of the exhaust. You can lessen/ pretty much eliminate the hissing with better exhaust designs. The x pipe design is going to make the hissing louder but there is a way around it. Again it's all in the design of the exhaust. For example. The fi exhaust comes out of the cats and goes straight into an x pipe. The fi x pipe crossover is very small and creates Alot of hissing through it. I switched over to the invidia exhaust and noticed that the hole in the x pipe is larger to allow more air to crossover and flow with less turbulence. Also there are resonators right before the x pipe on the invidia exhaust to quiet to hissing down. There is virtually no hissing from the invidia exhaust. The fi exhaust hissing was almost unbearable. If companies start to use invidias design or even better use resonated x pipes I believe everyone will be much happier as there will be little to no hiss. I tried telling Tony this at fi only to be told that the different x pipe design would make no difference and that it was a characteristic of this engine and that nothing could be done to change it yet when I switched it made all the difference in the world. __________________ Cobb Tuned \| Injen Intakes \| Fast Intentions Long Tube Headers \| Fast Intentions TDX Catback 18" Resonators CF Mufflers \| Tommy Kaira Hebi Bebi Shift Knob \| 19x9.5/19x10.5 Five Axis Design S5:F w/ 245/40/19 - 285/35/19 Hankook Ventus V12's

03-23-2011, 05:14 AM	#63 (permalink)
BLM Enthusiast Member Join Date: Feb 2011 Location: NJ Posts: 342 Drives: 2011 Silver M6 sport Rep Power: 14	same here. the eta for the prototype is apparently 8 weeks so I would hope some time during the summer. Either way, the car is making great power. And it sounds great at WOT. __________________ K&N // GTM // BERK

03-23-2011, 06:37 PM	#64 (permalink)
CrownR426 A True Z Fanatic Join Date: Nov 2008 Location: South Korea Posts: 4,676 Drives: Manual Rep Power: 848	I just listened to the sound clip and damn that sucks! How don't you like that rasp when your car sounds amazing @ WOT. That is sexy. __________________ Love + Hardwork + Passion RIP SVTRacer

03-23-2011, 06:51 PM	#65 (permalink)
One_Quick_Z A True Z Fanatic Join Date: May 2009 Location: Seneca Il Posts: 1,374 Drives: 10 Civic EX Sedan Rep Power: 219	I'm telling you check my thread I have videos and the source of the hissing noise it the X-Pipe. Dan __________________ -My BRZ with exhaust will decimate all if we overnight parts from Japan- 10 Civic EX Sedan- Current Daily

03-24-2011, 10:02 AM	#67 (permalink)
BLM Enthusiast Member Join Date: Feb 2011 Location: NJ Posts: 342 Drives: 2011 Silver M6 sport Rep Power: 14	I wonder how much the hiss will be decreased with the FI RESONATED HFC? It's kinda price though. I wonder if it would be better to just save the money and go back to the stock cats? I think i'd sacrifice a lot of power though. __________________ K&N // GTM // BERK

03-24-2011, 10:38 AM	#68 (permalink)
cmancha003 Base Member Join Date: Jun 2009 Location: Fort Worth Posts: 60 Drives: 2010 370z Nismo #390 Rep Power: 16	Just out of curiosity, do you think an H pipe would help in all of this? I haven't seen many of them on the forums but I would think that it would help while also improving performance over the stock cats.

03-24-2011, 11:59 AM	#69 (permalink)
Footloose301 A True Z Fanatic Join Date: Apr 2010 Location: Naples, FL Posts: 2,659 Drives: 40th Rep Power: 21	FWIW I don't have hiss with my HKS HI POWER TI. However, I have stock cats and stillen G3 intake. __________________ 2010 40th Anniversary 370Z

03-24-2011, 12:01 PM	#70 (permalink)
BLM Enthusiast Member Join Date: Feb 2011 Location: NJ Posts: 342 Drives: 2011 Silver M6 sport Rep Power: 14	The ARK also has no hiss with stock cats either. I'm trying to decide whether it's worth it to switch from my RTP to a resonated hfc or if I should just go back to stock cats. They're so restrictive though. The hfc itself will lessen the hiss but I don't know if adding a resonator to the pipe will eliminate it. Im doubting it. The HFC guys have hiss and I have it with an RTP. __________________ K&N // GTM // BERK Last edited by BLM; 03-24-2011 at 12:32 PM.

03-24-2011, 03:42 PM	#71 (permalink)
Splinter Base Member Join Date: Feb 2011 Location: SATX & ATX Posts: 155 Drives: GM '11 370z Base+SP Rep Power: 14	the hiss supposedly comes from too much exhaust flow, so anything that is less restrictive than stock cats will hiss, i think __________________ 2011 Gun Metallic 370Z Base w/ Sports Package 6MT Mods: HKS Hi-Power, Test Pipes, Black Z1 Stillen G3s, Swift Springs, 20mm spacers F&R, AuCar 13.6' Android Screen, Backup Camera, G35 Homelink, Rear fog

03-24-2011, 05:44 PM	#72 (permalink)
BLM Enthusiast Member Join Date: Feb 2011 Location: NJ Posts: 342 Drives: 2011 Silver M6 sport Rep Power: 14	I THINK a Berk HFC/CBE combo doesn't hiss. Idk really. I'll either deal with it or re-install the oem cats. Not gonna pay another $500 plus install for a resonated cat pipe unless I'm sure it will eliminate the hiss. I'll just wait for ARK to release their pipe. __________________ K&N // GTM // BERK

03-24-2011, 11:24 PM	#73 (permalink)
Splinter Base Member Join Date: Feb 2011 Location: SATX & ATX Posts: 155 Drives: GM '11 370z Base+SP Rep Power: 14	hm i think the berk cbe is designed differently tho, their X section in made by welding 2 pipes bend in a U shape, which would give more volume in the part where the pipes meet for the flow to cross over. Same here, was looking at the ERZ/CNT HFC or RTP but im worried about the hissing, so i'll wait to see what ARK comes up with. edit: you can see a pic of the berk cbe in this thread __________________ 2011 Gun Metallic 370Z Base w/ Sports Package 6MT Mods: HKS Hi-Power, Test Pipes, Black Z1 Stillen G3s, Swift Springs, 20mm spacers F&R, AuCar 13.6' Android Screen, Backup Camera, G35 Homelink, Rear fog Last edited by Splinter; 03-24-2011 at 11:26 PM.

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