Porsche Killer Build

Chuck33079 · 05-25-2016, 10:07 AM

Quote:

Originally Posted by EVOHUNTER

This manifold issue could be solved with some 20$ flex pipes.

How? I'm genuinely curious. GTM manifolds are a log style and they usually crack between cylinders. Where does the flex section go?

TerribleONE · 05-25-2016, 10:18 AM

Quote:

Originally Posted by Chuck33079

How? I'm genuinely curious. GTM manifolds are a log style and they usually crack between cylinders. Where does the flex section go?

This

Don't think flex pipes would help anything.

roplusbee · 05-25-2016, 12:35 PM

Quote:

Originally Posted by Presto

You also need lot of go fast suspension bits like coil overs and anti roll bars if you don't have it already. Also better brakes, excellent sticky tyres.

Unless the NISMO Suspension is shot, this is not actually necessary. Additionally, the Sport brakes are just fine with better quality pads and fluids.

Now if he is planning to be a track junkie, he is going to have to spend some money in a lot of areas to address the strains of track performance, but that is a whole different animal in terms of engineering the build.

Quote:

Originally Posted by G37Some

tyres

THIS!

EVOHUNTER · 05-25-2016, 01:09 PM

they crack from the engine moving back and forth, when they're extremely hot, there only weaker.

my friend has a stage 2, gtm, his manifolds cracked 3 years ago.

We placed a flex pipe about 3" before the test pipe flange that bolts up to the manifold.

He was actually in 3 days ago, we changed his oil and etc...

His manifolds are still going strong 50,000 kms later.

Ive seen them crack in a few different places, but I truly believe that there isn't enough flex in there, Everytime you give your car throttle, the engine moves back and forth, the manifold is the weakest point, And when there red hot, there super weak.

Chuck33079 · 05-25-2016, 01:22 PM

So the flex goes between the turbo and test pipe?

EVOHUNTER · 05-25-2016, 01:54 PM

Quote:

Originally Posted by Chuck33079

So the flex goes between the turbo and test pipe?

test pipe, flex pipe, test pipe flange, turbo, manifold

Chuck33079 · 05-25-2016, 01:55 PM

So you cut into the downpipe and add the flex post-turbo. Ok, that makes more sense. After your initial post, I was racking my brain trying to figure out where you put the flex between the manifold and turbo.

roplusbee · 05-25-2016, 02:07 PM

That sounds interesting. I am curious as to why other manufacturer's do not have similar issues with regard to cracking. The GTM manifolds are cast iron or something else?

Chuck33079 · 05-25-2016, 02:18 PM

Quote:

Originally Posted by roplusbee

That sounds interesting. I am curious as to why other manufacturer's do not have similar issues with regard to cracking. The GTM manifolds are cast iron or something else?

They're cast iron. It's probably just a shitty casting process. OEMs have used cast manifolds for decades without major issues. Also, there's no support for the turbos on the GTM kit. The manifold holds all the weight.

EVOHUNTER · 05-25-2016, 02:20 PM

Quote:

Originally Posted by Chuck33079

So you cut into the downpipe and add the flex post-turbo. Ok, that makes more sense. After your initial post, I was racking my brain trying to figure out where you put the flex between the manifold and turbo.

Exactly, by adding that flex pipe you reduce a lot of stress on that manifold.

the flex pipe takes all that stress.

Seemed to work for my friend.

EVOHUNTER · 05-25-2016, 02:23 PM

Quote:

Originally Posted by Chuck33079

They're cast iron. It's probably just a shitty casting process. OEMs have used cast manifolds for decades without major issues. Also, there's no support for the turbos on the GTM kit. The manifold holds all the weight.

I forgot to mention this, we made 2 brackets out of flat bar steel for the turbos, these brackets where bolted to the block.

Now the block, manifold and turbo all move as one when the engine sways.

The flex pipe takes the stress now.

I can get you some pics if you want Charles.

Chuck33079 · 05-25-2016, 02:26 PM

Quote:

Originally Posted by EVOHUNTER

I forgot to mention this, we made 2 brackets out of flat bar steel for the turbos, these brackets where bolted to the block.

Now the block, manifold and turbo all move as one when the engine sways.

The flex pipe takes the stress now.

I can get you some pics if you want Charles.

That would be great. I'll bet the turbo supports made a big difference.

Masterbeatty · 05-25-2016, 02:38 PM

Quote:

Originally Posted by roplusbee

That sounds interesting. I am curious as to why other manufacturer's do not have similar issues with regard to cracking. The GTM manifolds are cast iron or something else?

Their metallurgy is most likely different and the design/ production method is different too.

roplusbee · 05-26-2016, 12:11 PM

Roger that. The 20Gs are supported by the Greddy manifolds as well. We worked a couple brackets to support some of the weight as well, but I never had an issue with cracking and I put roughly 40k miles on that setup (when it was in my 09 NISMO).

squid267 · 07-17-2016, 04:14 PM

MaxJax lift comes in Tuesday. First step to this install will be installing a lift. Then turbo install starting in August.

Oh and I ended up purchasing V3 exhaust manifold.

05-25-2016, 01:09 PM	#19 (permalink)
EVOHUNTER Track Member Join Date: Jul 2011 Location: Edmonton, Canada Posts: 681 Drives: BOOSTED3-7-0 Rep Power: 15	they crack from the engine moving back and forth, when they're extremely hot, there only weaker. my friend has a stage 2, gtm, his manifolds cracked 3 years ago. We placed a flex pipe about 3" before the test pipe flange that bolts up to the manifold. He was actually in 3 days ago, we changed his oil and etc... His manifolds are still going strong 50,000 kms later. Ive seen them crack in a few different places, but I truly believe that there isn't enough flex in there, Everytime you give your car throttle, the engine moves back and forth, the manifold is the weakest point, And when there red hot, there super weak. __________________ Last edited by EVOHUNTER; 05-25-2016 at 01:13 PM.

05-25-2016, 01:22 PM	#20 (permalink)
Chuck33079 A True Z Fanatic Join Date: Nov 2011 Location: Houston Posts: 12,265 Drives: 2011 370ztt Rep Power: 29539	So the flex goes between the turbo and test pipe? __________________ 2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

05-25-2016, 01:55 PM	#22 (permalink)
Chuck33079 A True Z Fanatic Join Date: Nov 2011 Location: Houston Posts: 12,265 Drives: 2011 370ztt Rep Power: 29539	So you cut into the downpipe and add the flex post-turbo. Ok, that makes more sense. After your initial post, I was racking my brain trying to figure out where you put the flex between the manifold and turbo. __________________ 2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

05-25-2016, 02:07 PM	#23 (permalink)
roplusbee A True Z Fanatic Join Date: Dec 2009 Location: Killeen, TX Posts: 2,360 Drives: 2007 350Z NISMO Rep Power: 23	That sounds interesting. I am curious as to why other manufacturer's do not have similar issues with regard to cracking. The GTM manifolds are cast iron or something else? __________________ 2007 350Z NISMO #0618: Zerolift \| UPREV \| F.I. \| Greddy \| Competition Clutch \| Injector Dynamics \| Aeromotive \| Pioneer \| JL

05-26-2016, 12:11 PM	#29 (permalink)
roplusbee A True Z Fanatic Join Date: Dec 2009 Location: Killeen, TX Posts: 2,360 Drives: 2007 350Z NISMO Rep Power: 23	Roger that. The 20Gs are supported by the Greddy manifolds as well. We worked a couple brackets to support some of the weight as well, but I never had an issue with cracking and I put roughly 40k miles on that setup (when it was in my 09 NISMO). __________________ 2007 350Z NISMO #0618: Zerolift \| UPREV \| F.I. \| Greddy \| Competition Clutch \| Injector Dynamics \| Aeromotive \| Pioneer \| JL

07-17-2016, 04:14 PM	#30 (permalink)
squid267 Base Member Join Date: May 2013 Location: Worcester, MA Posts: 207 Drives: 12 Nismo 370Z PW M6 Rep Power: 38	MaxJax lift comes in Tuesday. First step to this install will be installing a lift. Then turbo install starting in August. Oh and I ended up purchasing V3 exhaust manifold. Tigger likes this.

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