09 Nismo Z exhaust project

Megan370z · 02-14-2014, 11:36 AM

Quote:

Originally Posted by Dzel

In for laughs!!!

there shouldn't be any laugh.... please he is doing a nice personal project and there hasn't been any aftermarket part being sold as a 3.5'' anyway , on the 350z or 370z , unless you prove me wrong with a link somewhere

In general 3'' is still good.

(IMO there is a but...)

Chuck33079 · 02-14-2014, 11:46 AM

Quote:

Originally Posted by Megan370z

there shouldn't be any laugh.... please he is doing a nice personal project and there hasn't been any aftermarket part being sold as a 3.5'' anyway , on the 350z or 370z , unless you prove me wrong with a link somewhere

In general 3'' is still good.

(IMO there is a but...)

Correct. It's a cool project. I'm just trying to get him to correct the major issue before he gets to the end and regrets not doing it in the beginning.

Fulljim · 02-14-2014, 12:31 PM

Hi ! I'm wall ... Talk to me

Chuck33079 · 02-14-2014, 12:34 PM

You've been lead to water. It's on you to drink.

Fulljim · 02-14-2014, 12:36 PM

Sorry Chuck, but I think you are the wall in this discussion ...
Everything as been said, every aftermarket are 3in ...
Mandrell bends, Y pipe and HFC will provide the necessary
flow to have gains.

I respect your opinion, so from now, wait for results and then,
we'll talk again !

Megan370z · 02-14-2014, 12:39 PM

Quote:

Originally Posted by Fulljim

Sorry Chuck, but I think you are the wall in this discussion ...
Everything as been said, every aftermarket are 3in ... Mandrell bends, Y pipe and HFC will provide the necessary
flow to have gains.

I respect your opinion, so from now, wait for results and then,
we'll talk again !

mostly due to clearance..

Chuck33079 · 02-14-2014, 12:43 PM

Quote:

Originally Posted by Fulljim

Sorry Chuck, but I think you are the wall in this discussion ...
Everything as been said, every aftermarket are 3in ...
Mandrell bends, Y pipe and HFC will provide the necessary
flow to have gains.

I respect your opinion, so from now, wait for results and then,
we'll talk again !

Not even close. What aftermarket exhausts are 3"? The ONE that's on the market? The one that has gains simply because it removes the 2.3" bottleneck in the stock Y?

Here, I did the math for you. The area of a single 3" pipe is 45.606 cm^2. The area of two 2.5" pipes is 63.342 cm^2. That's a huge difference (17.736cm^2). You're introducing a bottleneck at the y. For comparison, a single 3.5" pipe has an area of 62.071 cm^2. Go back and read Megan's posts. You must have missed the part where he build a single exhaust. You should be taking his word for it because he's already done all of the testing.

Megan370z · 02-14-2014, 01:35 PM

Quote:

Originally Posted by Chuck33079

Not even close. What aftermarket exhausts are 3"? The ONE that's on the market? The one that has gains simply because it removes the 2.3" bottleneck in the stock Y?

Here, I did the math for you. The area of a single 3" pipe is 45.606 cm^2. The area of two 2.5" pipes is 63.342 cm^2. That's a huge difference (17.736cm^2). You're introducing a bottleneck at the y. For comparison, a single 3.5" pipe has an area of 62.071 cm^2. Go back and read Megan's posts. You must have missed the part where he build a single exhaust. You should be taking his word for it because he's already done all of the testing.

All I have to say which is already a big hint is if we aren't talking about headers, the next spot to look at is how the y-Pipe is made and even more importantly is the throat aera which will play one of the biggest role.

that's not only coming from me but by Find Custom Exhaust, Header Collectors, Race Mufflers & More | Burns Stainless

Fulljim · 02-14-2014, 01:42 PM

The Y collector will be assemble soon, i'll write the theory
behind my build ... But yes, it's a critical part.

jwick · 02-14-2014, 04:12 PM

Quote:

Originally Posted by Megan370z

you close but not quite.

OEM Y-pipe exit spec is as follow ; avg 2.5'' OD and 2.350'' ID ,, its a double wall exit (inner sleeve)

My caliper said I.D. was 2.4"ish

Megan370z · 02-14-2014, 04:32 PM

Quote:

Originally Posted by jwick

My caliper said I.D. was 2.4"ish

how about those then.
they are in lock mode at 2 different axis .

edit; we don't have the same y-pipe. do we?

jwick · 02-14-2014, 05:24 PM

I can't tell from your picture but if that's the factory y-pipe, then they are identical between G and Z. The battery was dead on my caliper so I had to guesstimate the reading. Not to mention I had the factory gaskets bolted on the flange so they were kind of in the way.

I'll agree with 2.35 I.D.

jwick · 02-14-2014, 05:25 PM

I should have bought a caliper with a damn dial instead of digital readout

Megan370z · 02-14-2014, 05:36 PM

Quote:

Originally Posted by jwick

I can't tell from your picture but if that's the factory y-pipe, then they are identical between G and Z. The battery was dead on my caliper so I had to guesstimate the reading. Not to mention I had the factory gaskets bolted on the flange so they were kind of in the way.

I'll agree with 2.35 I.D.

no worries,,, I'm just quite strict on measurement

I kind of jumped when you replied it was 2.4 instead of 2.35''
hehe

luigi90210 · 02-14-2014, 06:20 PM

Quote:

Originally Posted by Megan370z

no worries,,, I'm just quite strict on measurement

I kind of jumped when you replied it was 2.4 instead of 2.35''
hehe

sounds like every engine rebuilder i know :P

02-14-2014, 12:34 PM	#49 (permalink)
Chuck33079 A True Z Fanatic Join Date: Nov 2011 Location: Houston Posts: 12,265 Drives: 2011 370ztt Rep Power: 29538	You've been lead to water. It's on you to drink. __________________ 2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

02-14-2014, 01:42 PM	#54 (permalink)
Fulljim Base Member Join Date: Mar 2013 Location: Qc, Canada Posts: 44 Drives: 09 Nismo 370Z Rep Power: 12	The Y collector will be assemble soon, i'll write the theory behind my build ... But yes, it's a critical part. Megan370z likes this.

02-14-2014, 05:24 PM	#57 (permalink)
jwick A True Z Fanatic Join Date: Dec 2010 Location: Houston Posts: 14,532 Drives: '10 G37 6MT Rep Power: 2465056	I can't tell from your picture but if that's the factory y-pipe, then they are identical between G and Z. The battery was dead on my caliper so I had to guesstimate the reading. Not to mention I had the factory gaskets bolted on the flange so they were kind of in the way. I'll agree with 2.35 I.D. __________________ '10 G37T 6MT Graphite/Graphite - BP - G37T Build

02-14-2014, 05:25 PM	#58 (permalink)
jwick A True Z Fanatic Join Date: Dec 2010 Location: Houston Posts: 14,532 Drives: '10 G37 6MT Rep Power: 2465056	I should have bought a caliper with a damn dial instead of digital readout Megan370z likes this. __________________ '10 G37T 6MT Graphite/Graphite - BP - G37T Build

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02-14-2014, 12:31 PM	#48 (permalink)
Fulljim Base Member Join Date: Mar 2013 Location: Qc, Canada Posts: 44 Drives: 09 Nismo 370Z Rep Power: 12	Hi ! I'm wall ... Talk to me

02-14-2014, 12:36 PM	#50 (permalink)
Fulljim Base Member Join Date: Mar 2013 Location: Qc, Canada Posts: 44 Drives: 09 Nismo 370Z Rep Power: 12	Sorry Chuck, but I think you are the wall in this discussion ... Everything as been said, every aftermarket are 3in ... Mandrell bends, Y pipe and HFC will provide the necessary flow to have gains. I respect your opinion, so from now, wait for results and then, we'll talk again !