here is a straight on rear shot ;)

http://www.the370z.com/members/bulli...userdesign.jpg

^^^Looks good! Should sound great too.

Bullitt, perfect! Im not that great with photoshop and that rear shot is basically exactly what I have envisioned with my drawing. Thank you for putting it into perspective with a cleaner PS job!

So, I'm confused now...is this happening for real? The way we seem to all like it? Square with a diffuser? Because if it is...please someone PM me because I obviously want in on it first LOL.

I sent an email to Artcraft I think they still have my old bumper which i could cut up and make a mock up version for both types :D 2 hole and Center Hole. Danny, Do you know where to get the exhaust tip?

Mike

Not really, I was thinking about contacting some of the bigger exhaust companies for a custom set or just fabricate my own and send them out to powdercoat/polish/whatever...

EDIT: Thinking something like this and asking if it can be double walled/rolled for a thicker more quality look to it. I dont know, its a start...

http://www.truckcustomizers.com/imag...R4PIL823.1.jpg

you going to sand, mold, paint over the other exhaust outlets?

No I'm gonna cut the whole center section out and make a new one :D maybe something that could be reproduced and sold

Im all about functionality, but it looks terrible. I really still fail to see how one exhaust pipe flows better than two all other things being equal. I would've kept 2 and pulled them out of the bumper. That would completely leave the rear end open for a big diffuser. Let me illustrate...

http://worldjff.files.wordpress.com/...lenge_rear.jpg

http://i605.photobucket.com/albums/t...ndom/rearz.jpg

:iagree:

I mean our renders werent supposed to be super accurate, just an idea (unless your talking about RobiSpec's stuff :))...but if you take your version of it you still have room in the center for a single exhaust and have the diffuser work as intended...I happen to think both versions look great!

Only if we can get someone to make this...

LOL i just had a thunk: center exhaust outlet out the butthole and wheelie bars out the stock exhaust locations for the drag cars. Somebody Photochop and i will laugh.

No, I was talking about Robispecs car. So can someone explain to me how one large pipe flows better than two large pipes? Is it a exhaust pulse thing with one pulse pulling the other out? or is this just a "lets lose weight and flow better than stock with a single bigger pipe" type thing?

I imagine it has to do with the second option; obviously I cannot speak on Robi's behalf, but it seems to me that the car will be benefiting from weight loss, less bends, and depending on their finished rear diffuser, aerodynamics.

The way I look at it, if I am sipping on a drink, I would rather have one straw that is more straight instead of two straws with a few bends.

I do not think that the benefits from this modification will be extreme or dramatic, but for those who need the extra few lbs, I am sure this is it.

Maybe after your Z34 goes all track, you can look into the F430 exhaust & diffuser combo...for something that sexy I'd throw down even though I don't own a Z :happydance:.

-Hunter

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

only if it makes a slide whistle sound! :roflpuke2:

Haha, with the right help, I wouldnt mind having my exhaust come out the middle of the bumper and having a giant diffuser there instead. Its too bad I don't own a shop hehe.

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

Makes sense. Interested to see how this turns out.

Maybe its for the torque.

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"

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.

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.

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

http://upload.wikimedia.org/wikipedi...de_exhaust.JPG

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.

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

Anything like that will require fram cutting... Forged performance is going that route :tup:

Woah now i don't need my exhaust disintegrating on my causing engine failure :p

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.

:bowrofl:

hahaha funny I type quick and sometimes letters get left out :rofl2:

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...

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.



I heard V-band and longtube..:excited: :yum: :eek:

I look forward to reading your journal updates :tup:

-Hunter

No harm intended i thought it would be a funny car joke.

Edit: Not saying you found it offensive just backing up my intent before a problem occurs so we don't fight this out over three pages and kill the thread.

Also i like the v-band idea for swapping out exhaust components might have to do that with my mufflers(for that stupid-loudness)

Edit2: Is it okay to give rep for being able to take a joke and not starting a big internet argument?

Because of the uneven firing order of the cylinders in a V6 like ours, we don't really need crossover pipes. The idea is that there aren't any exhaust pulses arriving into the exhaust at the same time and therefore we don't have a flow obstruction issues. At the same time, crossovers have been shown to increase the efficiency of V6's and make more power..as long as the crossover happens at the correct distance from the headers. Placing it too far or too close is actually detrimental. So you can get away with having a single exhaust, just as long as you have equal length headers.

Remember, this is a race car project and weight does become a factor over looks. To be honest, the car sounds much better in person and on the track. We've heard nothing but positive responses regarding that. That being said, as the car owner, I do like the other posters idea of a square exit and his diffuser. We haven't had the car that long and Robi has been working his *** off getting it ready for not only SEMA but for competition as well. I can only push him so hard :icon17:

The exhaust is not 100% finished. We'll clean it up and shave some more weight. Also, if it's not functional it won't be on my car.

We appreciate the comments and suggestions/ideas so please, keep 'em coming :tiphat:

Z06stan

would there be a simple way to push the center exhaust through the rear fog light hole and create a carbon layover that hides the dual exhaust cutouts and surrounds the center tip exit?

Oooh that would be all kinds of sexy for the US market. But yeah, would definitely be some custom work, or copy something like the newer Camaro. Granted, it would really get away from the racing aspect of having it but also sell to a more image driven consumer.

http://www.camaro5.com/forums/attach...7&d=1225846942

Or a Rounded Edge Trapezoid Tip w/e a CF insert to cover the edges of the fog

http://www.mufflermall.com/images/mufflers/62_1107.jpg

And there's another I found but the pic is a dead link :(

However, here's a link to a fany thread I saw that might interest some alternative thinking. (The motor cycle, first lambo, and Bugati are the ones I like but I'm biased)

MotiveMag Forums: Center exit exhausts....

Uh it has to do with exhaust pulsing, etc - not drinking soda from a straw ;P

Again it really depends on what's more important to you - form or function. Dual twisty straws or a single 8" chrome plated straw with a 12" Ti tip.

ok so im wondering y 1 exhaust i thought 2 exhasut is better for more flow and y do all the supras have the single exhasut too?