Sorry that no sound clips are happening. I had my car for half a day before it started snowing here, which is bull ****. So not gonna be able to get some well done driving vids until weather gets nice. I can get an iphone vid of just revving it tho tomorrow morning

 

Exhaust looks incredible. Very well done. Looks aggressive and I bet it rumbles beautifully.

In for vids.

 

Sorry guys I got absolutely swamped with exams and stuff the past two weeks. Tonight I got a bunch of sound clips. Standing still rev, take off and some rolling take offs on the thruway. My buddy who did all the footage is putting stuff together and I'll have some clips up in the next couple days

 

this makes me wish I had better welding skills... Looks great...

 

Is this thread still alive?

I'm anxious to hear it and more importantly (and flying in the face of some "wisdom" I've read in this thread), very interested to hear about the effect on the torque curve and throttle response (or lack thereof...). That's some seriously big piping for NA street use.

And yes, I'm a veteran of about a dozen-and-a-half custom exhaust systems for both street and track... where it's been proven that bigger ISN'T always better.

But dang, that's a work of bending and welding art!

 

I was hoping to hear some clips.

 

On the street difference isnt all that important unless you want to go ricing around with other similarly slow cars. If you want to get every tenth out of the car at the track or on a circuit yeah ofc a bigger pipe isn't going to help.

 

not for NA, but FYI, here is my custom 4" exhaust for FI

<blockquote class="instagram-media" data-instgrm-captioned data-instgrm-version="4" style=" background:#FFF; border:0; border-radius:3px; box-shadow:0 0 1px 0 rgba(0,0,0,0.5),0 1px 10px 0 rgba(0,0,0,0.15); margin: 1px; max-width:658px; padding:0; width:99.375%; width:-webkit-calc(100% - 2px); width:calc(100% - 2px);"><div style="padding:8px;"> <div style=" background:#F8F8F8; line-height:0; margin-top:40px; padding:50% 0; text-align:center; width:100%;"> <div style=" background:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACwAAAAsCAMAAAApWqozAAAAG FBMVEUiIiI9PT0eHh4gIB4hIBkcHBwcHBwcHBydr+JQAAAACHRSTlMABA4YH yQsM5jtaMwAAADfSURBVDjL7ZVBEgMhCAQBAf//42xcNbpAqakcM0ftUmFAAIBE81IqBJdS3lS6zs3bIpB9WED3YYXFPmHRfT8s gyrCP1x8uEUxLMzNWElFOYCV6mHWWwMzdPEKHlhLw7NWJqkHc4uIZphavDzA 2JPzUDsBZziNae2S6owH8xPmX8G7zzgKEOPUoYHvGz1TBCxMkd3kwNVbU0gK Hkx+iZILf77IofhrY1nYFnB/lQPb79drWOyJVa/DAvg9B/rLB4cC+Nqgdz/TvBbBnr6GBReqn/nRmDgaQEej7WhonozjF+Y2I/fZou/qAAAAAElFTkSuQmCC); display:block; height:44px; margin:0 auto -44px; position:relative; top:-22px; width:44px;"></div></div> <p style=" margin:8px 0 0 0; padding:0 4px;"> <a href="https://instagram.com/p/5q-AY9s1Co/" style=" color:#000; font-family:Arial,sans-serif; font-size:14px; font-style:normal; font-weight:normal; line-height:17px; text-decoration:none; word-wrap:break-word;" target="_top">1065whp @2bar q16, 760whp @1bar 91oct - z33 PROEFI128 cold start, custom 4" exhaust idle w/ 280 Tomei Cams #1000hp #buildmotor #tomei #jdm #350z #z33 #topsecret #cwest #vertex #burnstainless #precision #wiseco #darton #fabrication #proefi</a></p> <p style=" color:#c9c8cd; font-family:Arial,sans-serif; font-size:14px; line-height:17px; margin-bottom:0; margin-top:8px; overflow:hidden; padding:8px 0 7px; text-align:center; text-overflow:ellipsis; white-space:nowrap;">A video posted by Jorge Lozano (@iiquicksilverii) on <time style=" font-family:Arial,sans-serif; font-size:14px; line-height:17px;" datetime="2015-07-28T07:26:24+00:00">Jul 28, 2015 at 12:26am PDT</time></p></div></blockquote>
<script async defer src="//platform.instagram.com/en_US/embeds.js"></script>

 

That is an intimidating sound right their. I bet the neighbors love you.

 

F-em'

one old rady kind did an even got "racist" with me about how my kind should go live in the ghetto...told her to F-off...

There is a few neigthboors with loud Harleys and a couple with a lambo and a Ferrari that sound pretty mean too.

Thanks though....the sound was better than I ever expected it would be....all premium parts....4" single exhaust...not sure who else has made a single 4" for a Z

 

What ever happened to OP I would like to hear how his turned out, Seems like a lot of work for him to just fall off the planet.

 

I know thats why I posted a comment a month after the fact that car must be somewhat ridiculously load without some turbines to quiet it down.

Did you find a tape measure yet? You seem like the only hope for an answer.

 

This is the most confusing statement I've ever read.

First off, I drive my car on the street and my point was that losing bottom end is NOT a desirable thing for me (BTDT).

Secondly, I do not "rice around" on the street, I drive on the street and I run my cars hard in the hills. While not track applicable nor street applicable and being somewhere in between, I know my cars well enough to know how and when a change has occurred somewhere on the power curve. Even a simple S-Tune catback change I can tell the difference at these speeds.

Thirdly you say that a bigger pipe isn't going to help on the track.

So, my question on your commentary, if stupid on the street, and no help on the track then WHEN does a larger pipe benefit a car/driver???

And if it doesn't help anywhere, as you suggest it doesn't, then doesn't that support my original question to the OP about the effect on the torque curve being good, bad, indifferent?

Mic

 

Larger pipes decrease exhaust velocity. Past a certain point, you drop exhaust speed so much that you hurt scavenging of exhaust pulses out of the head. This means you don't make as much power. Too small and you restrict flow, which can increase exhaust velocities, and cause un-even flow because again you are changing the scavenging of exhaust pulses.

I'd call a ypipe and a Nismo exhaust barely noticeable power wise. Personally I'd say that the "gains" you feel are more in your head than actual power, simply because the car is louder. On the street you aren't being timed. And I call anyone who races around town with their exhaust "ricing around". I've done it. Everyone when they install an exhaust does it. But it's still ricing really. It's less than 5 hp gain without a tune, and having stock cats so it's pretty negligible. You'll get better acceleration by running less gas in the tank than a ypipe+nismo muffler.

And Quick my 4 inch sounded like that. I had a vibrant race muffler so it would just shake all the windows and pictures in the house at idle and while revving. There are a few single turbo z's with 4". Zion has one, Hal's car had one, mine I guess technically had one, and one guy BLDG who had a gt40 single turbo had a 3 1/2" to 4" exhaust. There may be a few others as well, but yeah. From videos, it seems they all kind of sound the same. Raspy af.
Oh I forgot, there's a guy out east I know who has an SP TT setup with a 4" exhaust. He revs to 8k and makes close to 1000whp too.

 

Oh, I get all that re: scavenging... been trying to tell people that Nissan and most mfgrs have done a pretty decent job in the last quarter century of designing very efficient and actually, decent sounding/looking exhaust systems. Your comment was just confusing as it seemed to condemn exhaust tuning in both "street ricing" (laff) application and racing. Still not quite sure I get what you're saying but, I understand the theory you're espousing.

I definitely agree with you about the Y-pipe/exhaust yields. 5 hp would be an overstatement. And that's why my S-Tune sat in my garage two months before I installed it.... not in any hurry to "realize" nominal yield. But now that I've installed it and driven on it, well, can now say "been there, done that" as one of the last "experiments" on my cars and if anyone asks, can tell them exactly what to expect.

 

MicVelo what Resmarted was probably hinting at is that the loss in torque on the low end are just as trivial as the potential gains up top, from larger tubing with no tune. All your diatribes about torque loss are mostly a function of the perception given by louder engine noise at a given rpm. Which makes you feel like you arent going anywhere but just making a lot of noise.

You keep alluding to how perceivable this torque loss is while daily driving, sorry but you just lumped yourself in the same boat as those who think theyre actually making large gains by adding an exhaust.

 

OK, guilty. Faulty butt dyno.

Will agree to disagree. I know what I know, feel what I feel, and know that I'm probably being more picky than most. But...that a lot of my perception is based on historical data/cars, in particular, one of my normally aspirated S30s that shifted the power delivery curve so drastically upward after putting on a large "turbo muffler exhaust and 2.5" piping".... and NOT on contemporary usage.

And as far as gains (on contemporary platform) are concerned, like I said, the difference from adding larger Y-pipe and lower restriction pipe-back to my NA car is negligible. That I know NOW....from experience.

But ready for turbo now. Hahahahahahahaha!

All good, thanks for the lesson.

 

You're in Cali too, why not save yourself the trouble and just buy my car? Lol seriously. It needs a little more work to get her running tip top, but the chassis is one owner, all the parts are legit. Vortech setup for e85 built motor 600whp+ capable 8,000rpm. I have some serious medical bills, and I'd really like to not have to move back in with my parents. Just keep your current Z for a daily.

 

That sounds amazing.

 

Thats awsome man, I rev to 8.2k, I had not see them much, I added a vibrant mid pipe muffler to make it a bit less rasp, and exit muffl we is race ver. Burn stainless....also from 3.5" -to 4" dp...i think they really make sense for big single turbo builds like supras

Do you still got pica or vid?, ill get some more from under car, I always appreciated the effort in the fabrication make it it as tight up as possible.

I had mine done in like 2011 lol but I sorta stopped post whoring here so I didn't say much lol...