12SecZ

Completly new Catback all custom done from scratch.

Latest work starts on this page on the last photo and continues for another page (I took the pics in series before and after.)

Click Here

Total price out the door? (I know people will ask) $150.00 bucks!

In case those didn't see the first half it starts on this page (this work was done in 2 sessions) this first session was the resonator removal and FlowMaster addition, I take credit for being the first to try the 80 series but my Tech has more ideas for top end should I go turbo. Anyways let me paste the first link in then explain what I *might* do if I go Turbo.

Initial work starts at last photo on this page

Anyways let me first say that the car flat out screams. The difference is very noticable. There is no delay when opening it up as there was before (very slight bog) it just flys like a rocket. I hit 85mph a full second before I used to (I am not exagerating.)

It kicks in around 3k to 4k it seems. The stock cats and FlowMaster were retained to keep back pressure but if I go Turbo my Tech want to cut in a MagnaFlow straight through Muffler with no chambers at all. Talk about flow! He said this would only be done if I went Turbo and would cost about $140.00

So session one was $240.00 and session two was 150.00.
That's under 400 backs for a completely new catback including muffler!!

Thoughts?

I think they did an excellent job on the Y-Pipe myself. This is a different shop than the one that did session one. They both have their own unique areas of expertise.

I'm sure that people want Dyno #'s but I am not ready to Dyno yet at only 2k miles and I have never put much stock in the numbers. My butt meter and track times are more important to me. But after Injen makes a Blue CAI I will Dyno to see where I am at at the Rear Wheels and post it. Hopefully by then I will have around 5k miles and get a good accurate reading. I will have new plugs by then too. Looks like AEM is only going to do M/T versions so their loss.

Thanks foir reading this long post!

bringthenoise

Why wouldnt you dyno it before, so you know before-after results?

2003z

iTrader: (7)

Looks much better than mine.

this is from this thread:https://my350z.com/forum/newreply.ph...threadid=16666

"PS: We will soon be offering the 350Z intake system with black silicone hoses for the Blue RD1985 only. This also includes the custom molded elbow which makes the lower portion of the intake system. For those that already have the intake system, replacement hoses can be special ordered from your Authorized Injen Retailer.

Phillip
www.injen.com"

so you shouldn't have to wait much for the blue one.

12SecZ

Thanks for the Injen info 2003z!
Apreciate it! Your design is still better than stock, the stock Y Pipe is a bottle neck. Do you fell less bog when you punch it now?

As for the Dyno I have allot of reasons not to Dyno at 2200 miles.

A. Cars tend to Dyno higher after about 5k miles and I don't like to Dyno them too often because it stresses the car.

B. I have been down this mod road before and I pretty much know what works and what doesn't and trust those that work on my car. I have learned to take their advice

C. I don't put much stock in Dyno numbers. I have seen cars that Dyno a full 25RWHP lower beat that car by 3 tenths in the quarter. So what did the Dyno number prove to the loser? He has more HP!

D. I think this board has established a base line Dyno as a stock number so after I can guestimate what gains I have off of this average.

E. Dyno runs are 60 bucks here, before after that's 120 bucks.
80% of the cost of my catback

I have other reasons but those are the main ones. Besides I just found out my Dyno man Ralph at Hot Rod Heaven shut his doors and sold his 9 second car. No where to Dyno in Sac?

12SecZ

They are coming I promise.

A Dyno and a time slip will be at my site and posted here as soon as I can.

I would say an average Dyno using a Dyno Jet here is about 230?
I have seen 224 low and 240 high?

If I get 250 then I did something right? So far exhaust is all I have done. I even pulled my K&N and sold it to a member here.

So any increase will have to have come from the exhaust.

I will commit to a Dyno before I do another mod how is that?

I think I found a place about 20 miles from here. Next Pay Day I will upload 3 runs, anything over average we can attribute to the exhaust (and add 1HP for the Earthing Kit )

I have changed my mind on the Torque Converter. Had a friend/mechanic play with my car on detail day (last sunday) he was flashing it, he estimates it at about 2600 which is excellent for stock! They really did this car right. IIRC my LS1 stock stall was 2200!

nj1266

I have few questions

1. What size tubing did you use for the exhaust?

2. Is your muffler straight through or chambered?

3. Is the tubing crush bent or mandrel bent?

12SecZ

1. 2.5 all the way back
2. 3 Chambers,
3. The Y Pipe is Mandrel Bent

I think I amswered the straiht through reasoning and sizing
questions on my website and in my post, I said I was considering using a straight through if I go to Turbo and I said I kept the cats stock and the muffler chambered for back pressure 9less torque loss)

Right now I am using a 3 Chamber FlowMaster. It used to say that in my sig until I condensed it today.



Hehe, I wish.. I think you are misreading me somewhere, I never said I added an Intake or Headers so when I Dyno it will be just exhaust that would show gains.

I asked about Headers and thanked someone about the Injen in Blue. Hope I answered all of your questions, if not ask away, just reread the threads first?

L8TR!

12SecZ

I see you caught the mistake and edited it.

For an example of gains let's use the Top Secret Y-Pipe Design

Then look at mine again. Pretty cloe eh?

What is Top Secret Claiming for gains and how much do they cost?

12SecZ

See how theres hits the 3 inch flange then drops back to stock?

Mine keeps going 2.5 after the 3 inch all the way back

see here

Apexi350z

iTrader: (3)

Your Y-Pipe and Top Secret's are close but still there are two bends on your pipe that I see. Not sure if they make a difference... Good work though.

12SecZ

It can't be as bad as the bends that the stock pipe takes that's for sure.

apsilon

MaxHax,
Don't take this the wrong way but they're regular press bends, not mandrel bends. See the crimping on the inside of the bend? That's from it being press bent.

12SecZ

I didn't watch them do the pipe I was watching a movie up front (Meet The Parents) it was funny as hell. Every once in awhile I would go around and take a pic.

It sounds like I will have to go get a Dyno to have people accept this mod. Payday is the 21st, I will have one then.

apsilon

I wasn't saying that it won't give an improvement over stock, just that the bends aren't mandrel. I thought you might like to know if you asked and payed for mandrel bends you didn't get them. That's all.

12SecZ

I wasn't offended and apreciate the info. I went in asking for a new Y Pipe and Car Sound Cats. I didn't specify anything in particular I just trusted them.

Mandrel is more expensive I take it, thus the high charge for catbacks I guess. Now I am curiuos to see where I am at.

apsilon

I think you're exactly where you were at before. I'm sure it'll give an increase over stock and will be interested to see the results. We don't have the Z down here yet so I'm watching what other people are doing, seeing what works etc while I wait for them to arrive.

Mandrel bending can be expensive so yes, it's often the reason for high costs on some exhausts.

Anyway, time to go to work

12SecZ

That statement condadicts itself. I cannot be exactly where I was at (stock) and get gains can I?

Man, the boards are beating me up today. In almost every thread lol.

Think I'll check out too.

Have a good day at work!

apsilon

That wasn't very clear on my behalf was it. What I meant was that you were in the same position you were in before any of my comments. ie you have a new catback system that the SOTP dyno says has made a positive difference so don't worry about the bends.

BTW how does it sound?

12SecZ

It's the same at low rpm and idle.

It's louder and deeper at WOT.

I plan on doing a Dyno on Tuesday or Wednesday of next week I need to see where I am at because I have more plans!!

Wish me luch, think high numbers!

Thanks!!

Phatmitzu

iTrader: (34)

Pretty nice. But you used pressed bend pipings, thats why it was so cheap. should of used mandrel bend pipings for better flow, and if you are planning on turbo charging it later on, mandrel bend makes a huge difference on performance gain.