Thinking out side the box 370z SINGLE TIP EXHAUST

vipor · 11-09-2009, 06:56 PM

Quote:

Originally Posted by bullitt5897

Haha I want my straw to have a ton of funky bends! Viva crazy straws!

hehe

only if it makes a slide whistle sound!

Knives · 11-09-2009, 10:04 PM

Correct me if I am wrong here, but wouldn't funneling exhaust gases into a single pipe create a log jam, so to speak??
Or is the diameter going to be larger than 2.5/2.75 to compensate?

370Ztune · 11-10-2009, 12:42 PM

Quote:

Originally Posted by Knives

Correct me if I am wrong here, but wouldn't funneling exhaust gases into a single pipe create a log jam, so to speak??
Or is the diameter going to be larger than 2.5/2.75 to compensate?

More than likely they will use a larger diameter; probably 3".

-Hunter

Knives · 11-10-2009, 09:04 PM

Quote:

Originally Posted by 370Ztune

More than likely they will use a larger diameter; probably 3".

-Hunter

Makes sense. Interested to see how this turns out.

RCZ · 11-10-2009, 09:19 PM

Maybe its for the torque.

Robispec · 11-11-2009, 01:31 AM

No its for the sexy sound!

YouTube - Robispec Nissan 370Z single exhaust

the twin exhausts I have seen are 40-50 mm the single is 3" = 77mm

the 3" flows 4 times what a 40mm single 3 times a 50mm and 2 times a 60mm would so 40mm + 40mm = 2x the flow...vs 4x with the "BIG single"

semtex · 11-11-2009, 07:18 AM

Sounds okay. Kinda average, to be honest, maybe even slightly below average. That's just my subjective opinion, of course; I prefer a deeper sound. But I'd be more interested to see what kind of gains this design yields over stock on the dyno. Function trumps form, in my books.

1slow370 · 11-12-2009, 04:31 AM

A little loud for my tastes but that is what a single should sound like. Reminds me of the guys in my car club with de 350z's with exhausts except with more awesomeness up top thanks to the vq37. I'm going to go from the dual 2.5 header outlets through a custom y pipe into single 3.5 to the back. i wan't to see what one large tip the size of the rear valence area looks like before i decide on tips. Three problems so far- 1. spent all my exhaust money on fines 2. hard to snake 3.5 out past the axles without being a scrape machine 3. Hard as hell to find good 3.5 stainless and mufflers. Thinking of using a borla race straight through in the middle and maybe something at the back. It's still at bar napkin stage.

RCZ · 11-12-2009, 11:57 AM

Quote:

Originally Posted by semtex

Sounds okay. Kinda average, to be honest, maybe even slightly below average. That's just my subjective opinion, of course; I prefer a deeper sound. But I'd be more interested to see what kind of gains this design yields over stock on the dyno. Function trumps form, in my books.

+1 but I dont have a race car. So 5hp aint worth the less than spectacular sound.

370Zsteve · 11-13-2009, 02:09 AM

Quote:

Originally Posted by RCZ

5hp aint worth the less than spectacular sound.

But add the weight savings of a single vs a dual, and then maybe the equation improves?

There is a ton of conflicting info on the web about this subject (single vs dual), and a ton of outright BS (one site goes so far as to say that exhaust gas does not flow backwards at all) but I've always understood that a properly designed single is no more or less efficient or powerful than a properly designed dual. It still comes down to balancing flow and velocity with the correct diameter, bends, welds and design.

RCZ · 11-13-2009, 12:45 PM

Quote:

Originally Posted by 370Zsteve

But add the weight savings of a single vs a dual, and then maybe the equation improves?

There is a ton of conflicting info on the web about this subject (single vs dual), and a ton of outright BS (one site goes so far as to say that exhaust gas does not flow backwards at all) but I've always understood that a properly designed single is no more or less efficient or powerful than a properly designed dual. It still comes down to balancing flow and velocity with the correct diameter, bends, welds and design.

Yeah weight savings does tip the scales a little bit in favor of the single pipe. Maybe something to look at later down the road. Although longtube headers running straight all the way back would be better in my opinion. Throw a couple of v-banded cats in the middle for daily driving and then replace them with V-banded straight pipes for the track. I think I just made a mess in my pants and I figured out what I'm eventually going to do with my exhaust...

370Ztune · 11-13-2009, 01:49 PM

Quote:

Originally Posted by 370Zsteve

But add the weight savings of a single vs a dual, and then maybe the equation improves?

There is a ton of conflicting info on the web about this subject (single vs dual), and a ton of outright BS (one site goes so far as to say that exhaust gas does not flow backwards at all) but I've always understood that a properly designed single is no more or less efficient or powerful than a properly designed dual. It still comes down to balancing flow and velocity with the correct diameter, bends, welds and design.

The way I look at it, lot of what determines the benefits of single vs. dual comes down to the diameter of the piping and the material used. If my theory is correct, a titanium single with 3"/4" main diameter should have better results when compared to a 2.5"/2.75" stainless steel dual exhaust.

When comparing theoretical exhaust designs, there are simply too many lurking variables to really draw a good conclusion. A better question to ask, would be something along the lines of "Is the Amuse R1000 single better than the Amuse RS-Silent in terms of performance?" or "Is the Robispec exhaust better than the F.I. or Stillen ehxaust?"

Just my .02.

Quote:

Originally Posted by RCZ

Yeah weight savings does tip the scales a little bit in favor of the single pipe. Maybe something to look at later down the road. Although longtube headers running straight all the way back would be better in my opinion. Throw a couple of v-banded cats in the middle for daily driving and then replace them with V-banded straight pipes for the track. I think I just made a mess in my pants and I figured out what I'm eventually going to do with my exhaust...

I heard V-band and longtube..

I look forward to reading your journal updates

-Hunter

Chupacabra · 11-12-2009, 12:09 PM

can something like this be done? a little cleaner and more form fitting... but that should clear enough in the center channel... to make a decent diffusing tunnel, with some side diffusers.

RCZ · 11-12-2009, 12:15 PM

side exit exhausts...of course it can be done. Its just annoying loud...like that pic you posted is annoying big.

Trips · 11-13-2009, 02:31 AM

Quote:

Originally Posted by RCZ

side exit exhausts...of course it can be done. Its just annoying loud...like that pic you posted is annoying big.

11-09-2009, 10:04 PM	#2 (permalink)
Knives Enthusiast Member Join Date: May 2009 Location: New York Posts: 293 Drives: 2009 370z 6MT Rep Power: 16	Correct me if I am wrong here, but wouldn't funneling exhaust gases into a single pipe create a log jam, so to speak?? Or is the diameter going to be larger than 2.5/2.75 to compensate? Last edited by Knives; 11-09-2009 at 10:08 PM.

11-11-2009, 07:18 AM	#7 (permalink)
semtex A True Z Fanatic Join Date: Jan 2009 Location: Behind enemy lines Age: 53 Posts: 5,995 Drives: People to drink Rep Power: 32	Sounds okay. Kinda average, to be honest, maybe even slightly below average. That's just my subjective opinion, of course; I prefer a deeper sound. But I'd be more interested to see what kind of gains this design yields over stock on the dyno. Function trumps form, in my books. __________________ "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.

11-12-2009, 12:09 PM	#13 (permalink)
Chupacabra Enthusiast Member Join Date: Jan 2009 Location: Weston, Florida Posts: 477 Drives: 09 Nissan 370z s M6 Rep Power: 200	can something like this be done? a little cleaner and more form fitting... but that should clear enough in the center channel... to make a decent diffusing tunnel, with some side diffusers. __________________ Where are my aluminum pedals?

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11-10-2009, 09:19 PM	#5 (permalink)
RCZ A True Z Fanatic Join Date: Nov 2008 Location: Miami Posts: 6,403 Drives: '09 370Z Rep Power: 1118	Maybe its for the torque.

11-11-2009, 01:31 AM	#6 (permalink)
Robispec The370Z.com Sponsor Join Date: Oct 2009 Location: socal Posts: 62 Drives: 350,370EvoStiS2kRx8 Rep Power: 275	No its for the sexy sound! YouTube - Robispec Nissan 370Z single exhaust the twin exhausts I have seen are 40-50 mm the single is 3" = 77mm the 3" flows 4 times what a 40mm single 3 times a 50mm and 2 times a 60mm would so 40mm + 40mm = 2x the flow...vs 4x with the "BIG single"

11-12-2009, 04:31 AM	#8 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7250	A little loud for my tastes but that is what a single should sound like. Reminds me of the guys in my car club with de 350z's with exhausts except with more awesomeness up top thanks to the vq37. I'm going to go from the dual 2.5 header outlets through a custom y pipe into single 3.5 to the back. i wan't to see what one large tip the size of the rear valence area looks like before i decide on tips. Three problems so far- 1. spent all my exhaust money on fines 2. hard to snake 3.5 out past the axles without being a scrape machine 3. Hard as hell to find good 3.5 stainless and mufflers. Thinking of using a borla race straight through in the middle and maybe something at the back. It's still at bar napkin stage.

11-12-2009, 12:15 PM	#14 (permalink)
RCZ A True Z Fanatic Join Date: Nov 2008 Location: Miami Posts: 6,403 Drives: '09 370Z Rep Power: 1118	side exit exhausts...of course it can be done. Its just annoying loud...like that pic you posted is annoying big.