Fast Intentions Long Tube Headers are here!

Daishi · 06-14-2010, 01:50 PM

Quote:

Originally Posted by cotizi

So I finally got these installed this past weekend and have put some miles on it. Question for those who have installed these already:

Does yours hiss like crazy? There's always been that deceleration hiss from the FI catback which ive come to know for awhile, but now its all over the place, deceleration, acceleration, WOT, whatever, there isn't really a throttle position or RPM where it isn't making the noise. At first I thought it was something loose, but after removing and reinstalling the section between the resonators and LTH the sound is definately comming from the resonator section or the muffler section after that.

I watched Semtex's video but he has the stillen catback so I don't think its a fair comparison. Tony's video doesn't have nearly the amount of noise im getting with mine, but im wondering if thats just from the recording or what.

Even before the LTH's I had a hissing noise even on acceleration. Theres just too much flow in the exhaust system and the x pipe makes it worse because of all the flow it hisses once the exhaust gases meet at the x pipe. Jack your car up and turn it on have someone rev it a little while you put your hands over the flanges and check for any air leaks. Careful not to burn yourself. Mines not leaking what so ever ive checked a million times already. Theres no rasp or hiss out the back of the mufflers but its easily noticeable from the side of the car or when the windows are open.

cotizi · 06-14-2010, 08:41 PM

Quote:

Originally Posted by Daishi

Even before the LTH's I had a hissing noise even on acceleration. Theres just too much flow in the exhaust system and the x pipe makes it worse because of all the flow it hisses once the exhaust gases meet at the x pipe. Jack your car up and turn it on have someone rev it a little while you put your hands over the flanges and check for any air leaks. Careful not to burn yourself. Mines not leaking what so ever ive checked a million times already. Theres no rasp or hiss out the back of the mufflers but its easily noticeable from the side of the car or when the windows are open.

I noticed this as well. Standing behind it in my driveway all you hear is narly exhaust note that sounds awesome, but the second you get next to it its the opposite, just hiss. When driving with the windows up I hear it all the time coming from what seems like under the spare tire area.

Jamaica · 06-14-2010, 10:12 PM

Quote:

Originally Posted by cotizi

I noticed this as well. Standing behind it in my driveway all you hear is narly exhaust note that sounds awesome, but the second you get next to it its the opposite, just hiss. When driving with the windows up I hear it all the time coming from what seems like under the spare tire area.

is the hiss getting annoying? does it sound bad? hopefully you feel the power

cotizi · 06-14-2010, 11:14 PM

Quote:

Originally Posted by jamaica951

is the hiss getting annoying? does it sound bad? hopefully you feel the power

Power yes, I uninstalled my intakes awhile back, and this weekend I went from just Catback to Catback + Intakes + LTH and their is absolutely a big difference. I'm taking the car in to get tuned by Uprev HQ soon and will post final dyno numbers after tune is complete.

I honestly didn't know the sound would change so much and the hissing noise would overpower the exhaust note so much. I don't like it. The physics behind it make sense, as now that there is more flow through the exhaust, the hissy-ness of the x-pipe would only get worse. I'll try and take a video of what I'm talking about tomorrow. Hopefully the audio equipment can do it justice.

I'm glad the Z isn't my daily driver, because it would get old fast. From some of the other stuff I've read on here, its a factor of the car itself, and is prevalent with other exhaust as well, not just FI's. I think the long tube headers just bring attention to something that I didn't notice nearly as bad when I just had the cat-back.

Jamaica · 06-14-2010, 11:47 PM

Quote:

Originally Posted by cotizi

Power yes, I uninstalled my intakes awhile back, and this weekend I went from just Catback to Catback + Intakes + LTH and their is absolutely a big difference. I'm taking the car in to get tuned by Uprev HQ soon and will post final dyno numbers after tune is complete.

I honestly didn't know the sound would change so much and the hissing noise would overpower the exhaust note so much. I don't like it. The physics behind it make sense, as now that there is more flow through the exhaust, the hissy-ness of the x-pipe would only get worse. I'll try and take a video of what I'm talking about tomorrow. Hopefully the audio equipment can do it justice.

I'm glad the Z isn't my daily driver, because it would get old fast. From some of the other stuff I've read on here, its a factor of the car itself, and is prevalent with other exhaust as well, not just FI's. I think the long tube headers just bring attention to something that I didn't notice nearly as bad when I just had the cat-back.

interesting. my car is a daily driver and honestly i want to hear the hiss. If you feel the power then maybe i can just tuneout the hiss.

F.I. Inc. · 06-17-2010, 10:56 AM

Quote:

Originally Posted by jamaica951

interesting. my car is a daily driver and honestly i want to hear the hiss. If you feel the power then maybe i can just tuneout the hiss.

I personally think it EVERYONE who has the long tube headers needs th 18" resonators only. At this point I have heard enough in person to make me believe the 18" is a smoother sound with less buzz or hiss!

The hiss is created by the car as we all know and the headers just enhance it. Bottom line, the more free flowing exhaust you have the more prominent the hiss will be. Now, with the combination of our long tube headers and cat back exhaust this is as free flowing as it gets!

Tony

F.I. Inc. · 06-17-2010, 11:02 AM

UPDATE- 6/17/2010

HNGonzalez: 001 (Installed)
Semtex: 002 (Installed)
Daishi: 003 (Installed)
Mr. Anonymous: 004 (Delivered)
Kolya: 005 (Installed)
The Dreamer: 006 (Installed)
LeonZ5: 007 (Delivered)
Earwicker7: 008 (Installed)
Zello370: 009 (Delivered)
Matrix_Square: 010 (Delivered)
Dainedazz: 011 (Delivered)
Cotizi: 012 (Installed))
Jason S. (Delivered)
NYBladeZ: 014 (Delivered)
Valentino: 015 (Delivered)
res0zsfa: 016 CANNOT GET AHOLD OF YOU FOR PAYMENT (SKIP)
Danny3.7: 017 (Delivered)
Tardcore: 018 (Delivered)
Booger: 019 (Installed)
PG6speed: 020 (Building)
Jnaut: 021 (Building)
Shultea1: 022 (Building)
VH370ZNISMO: 023
Vipor: 024
E.Johnson: 025 (Delivered)
Jamaica951: 026
MattKim85: 027
Bejan: 028
roplusbee: 029
Vegitto-Kun: 030

On a side note, I am getting married on July 3rd and I will be out of the office from starting July 2nd and will not be returning until July 12th. MY GOAL is to have the entire group buy completed and shipped before I leave. That is sets #1-25! That leaves 5 more sets within the next two weeks. I will make it happen. I know that this has taken longer than most have expected, myself included. Let's remember though production started a month late due to the tooling being almost a month late. In addition we have discovered that production on these is a little more time consuming than originally projected. I will always keep the lines of communication open, this is why I am telling all of this...

Thanks, Tony

Daishi · 06-14-2010, 10:45 PM

Quote:

Originally Posted by cotizi

I noticed this as well. Standing behind it in my driveway all you hear is narly exhaust note that sounds awesome, but the second you get next to it its the opposite, just hiss. When driving with the windows up I hear it all the time coming from what seems like under the spare tire area.

Yup because the hiss sounds like it's coming from the x pipe area. That's what your hearing your seat is basically slightly infront of the xpipe.

06-17-2010, 11:02 AM	#7 (permalink)
F.I. Inc. The370Z.com Sponsor Join Date: Feb 2009 Location: Simi Valley, CA Posts: 2,989 Drives: 2010 GT-R/2007 F-250 Rep Power: 687	*UPDATE- 6/17/2010* HNGonzalez: 001 (Installed) Semtex: 002 (Installed) Daishi: 003 (Installed) Mr. Anonymous: 004 (Delivered) Kolya: 005 (Installed) The Dreamer: 006 (Installed) LeonZ5: 007 (Delivered) Earwicker7: 008 (Installed) Zello370: 009 (Delivered) Matrix_Square: 010 (Delivered) Dainedazz: 011 (Delivered) Cotizi: 012 (Installed)) Jason S. (Delivered) NYBladeZ: 014 (Delivered) Valentino: 015 (Delivered) res0zsfa: 016 CANNOT GET AHOLD OF YOU FOR PAYMENT (SKIP) Danny3.7: 017 (Delivered) Tardcore: 018 (Delivered) Booger: 019 (Installed) PG6speed: 020 (Building) Jnaut: 021 (Building) Shultea1: 022 (Building) VH370ZNISMO: 023 Vipor: 024 E.Johnson: 025 (Delivered) Jamaica951: 026 MattKim85: 027 Bejan: 028 roplusbee: 029 Vegitto-Kun: 030 On a side note, I am getting married on July 3rd and I will be out of the office from starting July 2nd and will not be returning until July 12th. MY GOAL is to have the entire group buy completed and shipped before I leave. That is sets #1-25! That leaves 5 more sets within the next two weeks. I will make it happen. I know that this has taken longer than most have expected, myself included. Let's remember though production started a month late due to the tooling being almost a month late. In addition we have discovered that production on these is a little more time consuming than originally projected. I will always keep the lines of communication open, this is why I am telling all of this... Thanks, Tony __________________ *Follow us on Facebook: Fast Intentions Inc.* Phone: (805) 522-FAST (3278) Email: tony@fastintentions.com www.fastintentions.com "FUELED BY PASSION"

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