Fast Intentions exhaust is here!

Ron · 05-26-2011, 03:15 PM

Is there hiss on a completely stock exhaust on a non-nismo Z?

XwChriswX · 05-26-2011, 03:16 PM

Quote:

Originally Posted by Ron

Is there hiss on a completely stock exhaust on a non-nismo Z?

Believe so, but it's muffled enough you can't tell. I could hear it when decelerating from high rpms, but now it's much more pronounced with the straight through exhaust.

Ron · 05-26-2011, 03:25 PM

So I guess we can agree that hiss is caused by the extended X-Pipe design on non-Nismo Zs but incremented by the addition of HFCs since they are less restrictive. Less restricion = less muffled sound = more hiss. Same goes for TPs. Yes? No?

XwChriswX · 05-26-2011, 03:30 PM

Quote:

Originally Posted by Ron

So I guess we can agree that hiss is caused by the extended X-Pipe design on non-Nismo Zs but incremented by the addition of HFCs since they are less restrictive. Less restricion = less muffled sound = more hiss. Same goes for TPs. Yes? No?

I would agree to this. The sound is inherent from an X design, and with the increased flow from HFCs or TPs or LTHs' the hiss is more pronounced... Here check this out:

See how both pipes come together and even if you get an aftermarket Y pipe, you're still maintaining the X profile.

Here is the Nismo exhaust, notice the H crossing instead of a Y/X. Very different in terms of how it affects/improves the flow. This is why it's less noticable on a Nismo.

**Pics courtesy of my350z.com

Ron · 05-26-2011, 04:28 PM

I see what you are saying, but I think that even though the overall shape of the stock exhaust looks like an X, I would not call it an X-Pipe design and don't think it acts the same way.

True X-Pipes are basically 2 tubes with a small opening in the center connecting each other, right after this, they split into separate pipes.

On the stock design, gases come together on a single relatively long pipe and then it splits again. I think this would have an effect in sound and performance.

I guess what I wanna get at is that the hiss is caused by something else. Stock setup uses Y pipe and hiss is there... FI setup uses X pipe and hiss is there. Maybe its something with the engine itself, exhaust valves, gremlins. Lol I don't know.

wstar · 05-26-2011, 05:05 PM

Well, Chris's explanation about air pressure equalization between banks makes as much sense as anything else I've heard. If that's what causes the hiss, the hiss is probably present on any exhaust setup with a decent connection between the two sides, it's just a question whether and how well you can hear it under what conditions.

XwChriswX · 05-26-2011, 08:44 PM

Quote:

Originally Posted by wstar

Well, Chris's explanation about air pressure equalization between banks makes as much sense as anything else I've heard. If that's what causes the hiss, the hiss is probably present on any exhaust setup with a decent connection between the two sides, it's just a question whether and how well you can hear it under what conditions.

This is probably why the base stock exhaust is setup the way it is. To mitigate as much of this hiss as possible.

shawn84 · 05-27-2011, 03:47 AM

anyone have FI exhaust with CNT Racing HFC ??

F.I. Inc. · 05-27-2011, 10:29 AM

Quote:

Originally Posted by shawn84

anyone have FI exhaust with CNT Racing HFC ??

I am sure someone out of my 300 exhaust systems installed has to have that combination.

Do you already have our exhaust or is it something you are planning for?

Presto · 05-28-2011, 04:17 AM

and im looking for someone with the F.I exhaust with ART pipes to hear what that combo sounds like

ZOLE · 05-28-2011, 11:59 AM

Well, I have my UPS tracking info, the exhaust is on its way!

Says it should arrive this Thursday. In preparation I got under the car today and sprayed all bolts with PB blaster (I might hit 'em one more time on Wed). Everything looks like it should be straight forward, it's the first time I actually got a good look under the car.

For others who have done the install themselves I've got some questions. I backed up onto Rhino ramps in my driveway. Seems like I can get to all the bolts fairly easily (with the exception of the connections at the CATs where I had to crawl under from the side of the car. Wondering if I should bother jacking up the front a bit as well in order to get to the bolts near the front a little easier). Does anyone have any tips/tricks they can share? Anything I need to watch out for? I plan on doing the install the day it arrives (take off early from work if I have to). I heard it takes roughly 1.5-3hrs from start to finish.

Thanks in advance!

wstar · 05-28-2011, 04:25 PM

If you're just doing the catback, rear rhino ramps should be fine. The FI catback is really easy to install. Even if you're also doing HFCs it's still pretty easy, but you might need to lift the front as well to break the Cat<->Manifold bolts easily.

XwChriswX · 05-29-2011, 07:02 PM

I'd say, if you have the Ability to jack up the whole car, might as well for peace of mind. If not, then I would recommend to jack up the front end first, and get the HFC's on since that will be the most difficult part. And then if you run out of time, you can just bolt them to the stock exhaust, come back the next day and do the rest of the exhaust jacking up the rear end.

Footloose301 · 05-29-2011, 08:33 PM

^^Agreed. Removing stock cats might take awhile.

ZOLE · 05-30-2011, 11:18 AM

Thanks for the tips guys. I didn't opt for the HFCs just yet, so I'll just be installing the catback only. I might find some thick planks to put under the front wheels for a little extra room near the front. I just don't trust jack stands for much other than changing tires/wheels (where I'm not directly under the car).

05-26-2011, 05:05 PM	#6 (permalink)
wstar A True Z Fanatic Join Date: Mar 2009 Location: Houston, TX Posts: 4,024 Drives: too slow Rep Power: 3595	Well, Chris's explanation about air pressure equalization between banks makes as much sense as anything else I've heard. If that's what causes the hiss, the hiss is probably present on any exhaust setup with a decent connection between the two sides, it's just a question whether and how well you can hear it under what conditions. __________________ 7AT Track Car! Journal thread / Car setup details

05-28-2011, 04:25 PM	#12 (permalink)
wstar A True Z Fanatic Join Date: Mar 2009 Location: Houston, TX Posts: 4,024 Drives: too slow Rep Power: 3595	If you're just doing the catback, rear rhino ramps should be fine. The FI catback is really easy to install. Even if you're also doing HFCs it's still pretty easy, but you might need to lift the front as well to break the Cat<->Manifold bolts easily. __________________ 7AT Track Car! Journal thread / Car setup details

05-29-2011, 07:02 PM	#13 (permalink)
XwChriswX WFLYIDNNE Join Date: Jul 2009 Location: In The Fastlane Posts: 50,648 Drives: 02 GDB WRX Rep Power: 452	I'd say, if you have the Ability to jack up the whole car, might as well for peace of mind. If not, then I would recommend to jack up the front end first, and get the HFC's on since that will be the most difficult part. And then if you run out of time, you can just bolt them to the stock exhaust, come back the next day and do the rest of the exhaust jacking up the rear end. __________________ Bonnie - Stage 2, Audio build coming this fall! R.I.P. Abby 3/29/10 - 3/30/14

05-29-2011, 08:33 PM	#14 (permalink)
Footloose301 A True Z Fanatic Join Date: Apr 2010 Location: Naples, FL Posts: 2,659 Drives: 40th Rep Power: 21	^^Agreed. Removing stock cats might take awhile. __________________ 2010 40th Anniversary 370Z

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05-26-2011, 03:15 PM	#1 (permalink)
Ron A True Z Fanatic Join Date: Oct 2010 Location: Houston, TX Posts: 3,009 Drives: TT '11 PW Nismo #113 Rep Power: 22	Is there hiss on a completely stock exhaust on a non-nismo Z?

05-26-2011, 03:25 PM	#3 (permalink)
Ron A True Z Fanatic Join Date: Oct 2010 Location: Houston, TX Posts: 3,009 Drives: TT '11 PW Nismo #113 Rep Power: 22	So I guess we can agree that hiss is caused by the extended X-Pipe design on non-Nismo Zs but incremented by the addition of HFCs since they are less restrictive. Less restricion = less muffled sound = more hiss. Same goes for TPs. Yes? No?

05-26-2011, 04:28 PM	#5 (permalink)
Ron A True Z Fanatic Join Date: Oct 2010 Location: Houston, TX Posts: 3,009 Drives: TT '11 PW Nismo #113 Rep Power: 22	I see what you are saying, but I think that even though the overall shape of the stock exhaust looks like an X, I would not call it an X-Pipe design and don't think it acts the same way. True X-Pipes are basically 2 tubes with a small opening in the center connecting each other, right after this, they split into separate pipes. On the stock design, gases come together on a single relatively long pipe and then it splits again. I think this would have an effect in sound and performance. I guess what I wanna get at is that the hiss is caused by something else. Stock setup uses Y pipe and hiss is there... FI setup uses X pipe and hiss is there. Maybe its something with the engine itself, exhaust valves, gremlins. Lol I don't know.

05-27-2011, 03:47 AM	#8 (permalink)
shawn84 Base Member Join Date: Aug 2009 Location: Vancouver Posts: 149 Drives: 2009 370z Rep Power: 16	anyone have FI exhaust with CNT Racing HFC ??

05-28-2011, 04:17 AM	#10 (permalink)
Presto Base Member Join Date: May 2010 Location: Home Posts: 123 Drives: Car Rep Power: 15	and im looking for someone with the F.I exhaust with ART pipes to hear what that combo sounds like

05-28-2011, 11:59 AM	#11 (permalink)
ZOLE Base Member Join Date: Feb 2010 Location: Reisterstown, MD Posts: 164 Drives: 370Z PG Touring MT Rep Power: 16	Well, I have my UPS tracking info, the exhaust is on its way! Says it should arrive this Thursday. In preparation I got under the car today and sprayed all bolts with PB blaster (I might hit 'em one more time on Wed). Everything looks like it should be straight forward, it's the first time I actually got a good look under the car. For others who have done the install themselves I've got some questions. I backed up onto Rhino ramps in my driveway. Seems like I can get to all the bolts fairly easily (with the exception of the connections at the CATs where I had to crawl under from the side of the car. Wondering if I should bother jacking up the front a bit as well in order to get to the bolts near the front a little easier). Does anyone have any tips/tricks they can share? Anything I need to watch out for? I plan on doing the install the day it arrives (take off early from work if I have to). I heard it takes roughly 1.5-3hrs from start to finish. Thanks in advance!

05-30-2011, 11:18 AM	#15 (permalink)
ZOLE Base Member Join Date: Feb 2010 Location: Reisterstown, MD Posts: 164 Drives: 370Z PG Touring MT Rep Power: 16	Thanks for the tips guys. I didn't opt for the HFCs just yet, so I'll just be installing the catback only. I might find some thick planks to put under the front wheels for a little extra room near the front. I just don't trust jack stands for much other than changing tires/wheels (where I'm not directly under the car).