GT-R R35 Plenum Test Fitment on my VQ37HR

octet · 06-05-2014, 06:28 AM

This is still happening, will upload photos and details later on today, just finished chatting with Chris in Germany, extremely nice guy!!!

octet · 06-06-2014, 02:13 AM

Right, little update from Chris, after we've been chatting yesterday.

Quote:

"About 3 years or so I looked at the forums and after having decided to keep my car NA I looked into all possiblities to make more HP - did exhaust, 300cpi cats, manifolds, gen3 intake, NST pulleys. I didnt want to alter the engine internals like pistons etc. cause I track my car on all german and european raceways during the year and thats about the only purpose I have it for - no daily driver. This year I will compete in the first time attack series here in germany so the ultimate primary is reliablity!

When I first saw pics of that 1000HP build from GTM where they test fitted the GTR manifold I was in love. So I thought as everything else for this car is already avail and so many people pray for the GTR conversion I said to myself this would be a project I can be recognized for in the Z world - and having awesome friendship to a automotive parts designer I accepted the challenge and didnt want to stop until the goal is reached, my car running with that manifold.

Well, I wasnt aware what I decided to do the easiest part was buying a usied GTR manifold - then things went seriously. So many problems to solve - but as I have annouced already to make it happen I couldnt stop for my own piece of mind. First we discovered that the heads of the GTR have a totally different flange pattern, so a reuse of either the GTR lower nor the 370Z lower was possible. We had to create a hybrid with Z head flanges and GTR upper plenum flanges. Next problem was that the Z incorporates the injectors in the lower manifold so its not a simple cut&welding job but real CAD construction.

I wanted a design I can put together here at my shop so I dont need to have a cast iron - problem with cast iron is that the initial costs are really high and you have to order so many units at once that the financial effort is huge, and you cannot simply modify the design and evolve the part as once you have the cast iron negative you are doomed to produce with that to get your initial money back.

So I wanted a welded solution - we designed the lower flanges and the upper flanges - but the flange design is extremely difficult as you need to make a transition from the head ports to the upper plenum ports and connect both with round tubes. The CAD design in the end was one of the easy parts - cost me quite some money as this is nothing someone does for free but there was a result we could work with and the drawings looked awesome

The really PITA now was to have it acutally made - as our complex design asked for a 5-axis CNC machine which either not many shops own or those who do asked obscene prices, and I wanted just ONE - as a prototype for my car to test and fit and race before I would be eager to offer it to any one

Therefore I delayed the production for many months - at this point I had invested about $5000 in research and parts and construction already with nothing else than a drawing and CAD files for some CNC shop. You can imagine that my motivation has decreased at this point - having invested quite some money and no chance to transfer to the real world as just the prototype will cost another 10K+.

But over the months I continued to speak to CNC shops all over Germany and finally found one which made the 3 flanges (actually thats it, three f***ing flanges, some straight piping and a lot of welding) for under 5K.

I saved some money over the months and finally decided that I wanted to finish the project no matter what.

I ordered the 3 flanges, ordered the pipes, ordered a new aluminum welding machine and finally removed my stock intake manifold and started the build. I made my adapter and fitted it to my car.

Due to the welding I had to hand polish and grind every runner up and down to make the transition from oval lower to round to upper spheric perfectly smooth.

When the upper plenum was mounted we found out that the throttle bodies need to be relocated - happily I had the stillen gen3 already so I simply cut the pipes going into the front fascia and made it fit. The water cooling for tb was also removed - you could reuse it but for looks throw it away.

Here you see the welding of my prototype ON the car to make it a perfect fit - took 2 days and a lot of argon gas.

First I thought we need a different fuel rail but as I wanted to keep the design simple as possible and so that everybody would be able to install it to his car we found a way to keep the stock fuel system. Well of course you can use other rails but thats only an option not a need.

Above you see the finished prototype unit with rails and injectors installed. See that grinding in the runners - perfectly smoothed by my own hands during hours and hours.

Finished - no CEL codes, all sensors, pipes, hose, etc. are connected, idles completely stock, no ECU mod necessary, simply install, fire up and drive.

As I track the car 99% of the time I also wanted to find a solution for the strut bar - we tried to make the manifold as low as possible but no chance to reuse the factory strut
thats why the GT-R has none over the engine also, same problem.

So here is what the engine bay currently looks:

What we found while playing around with uprev and our inhouse dyno is that we have good gains across the torque band - power is also increased slightly in the low and mid range but for the top range we would need to alter the VVEL to really use the higher air flow which is not possible with OSIRIS currently, but for your Greddy Twin Turbo setup it should be awesome!

Adrian if you really want one of those I would be happy to reactivate the machinery and figure out a price. If you want feel free to share everything we discussed at the forums - of course it would make things easier if I order to CNC more parts at a time."

This is the chat I had with Chris yesterday. I will make sure I get some price estimates and some dyno sheets from him and post them here as soon as possible.

To make this happen, I would need a list of how many people are seriously interested in buying this, providing the price is fine. I would make a wild guess, cheaper than the GTM version. I will stay in touch with Chris and keep you guys updated here.

Please express your interest by putting your name in the list bellow:

1. octet
2.
3.
4.
5.

Adrian

370Z JT · 06-06-2014, 02:24 AM

Im interested!

octet · 06-06-2014, 02:27 AM

1. octet
2. 370Z JT
3.
4.
5.

Cell · 06-06-2014, 02:31 AM

Depending on cost I may or may not be interested. Will wait before putting my name on the list.

Sent from my Nexus 5 using Tapatalk 4

octet · 06-06-2014, 05:25 AM

Thanks Cell, will try to get price estimate early next week. Chris is working on it this weekend.

Anybody else interested?

Jordo! · 06-06-2014, 07:10 AM

I am very interested, but it would be nice to see a clear dyno of before and after EDIT: Meaning after tuning. I still only see the original dyno, untuned.

Also, would this include a modified strut bar or is the end-user on his or her own on that?

Otherwise -- congrats to Chris for successfully completing the project!

Rangerz · 06-06-2014, 07:21 AM

Im interested as well but, want to see price and dyno sheets like everyone else. Also what time frame for production after you lock in the list?

octet · 06-06-2014, 08:25 AM

It's not a final list guys, just express the interest so we gather an idea of how many we might need. This way we can negotiate with the CNC shop to get parts sourced at a better price.

I'll ask Chris to source prices for everything, including the strut bar.

1. octet
2. 370Z JT
3. Cell
4. Jordo!
5. Rangerz
6.
7.
8.
9.
10.

merkil · 06-06-2014, 11:16 AM

Subscribed for pricing details. From 2011 till now. Just amazing.

Sent from my iPhone using Tapatalk

octet · 06-06-2014, 02:02 PM

1. octet

2. 370Z JT

3. Cell

4. Jordo!

5. Rangerz

6. merkil

7.

8.

9.

10.

Benci · 06-06-2014, 02:13 PM

hmmmmm interesting........as long as the price is right......add me to the list

binary0x01 · 06-06-2014, 02:35 PM

Interested, intrigued, in...

octet · 06-06-2014, 03:26 PM

1. octet
2. 370Z JT
3. Cell
4. Jordo!
5. Rangerz
6. merkil
7. Benci
8. binary0x01
9.
10.

Good stuff, we should be able to get this a lot cheaper if we can order like 10-15 kits at least. Keep expressing your interest guys, I know we don't have a price tag yet, but we should have it pretty soon, as I said.

Rusty · 06-06-2014, 05:55 PM

Interested. Depending on the price and dyno sheet.

06-05-2014, 06:28 AM	#1 (permalink)
octet Enthusiast Member Join Date: Jul 2013 Location: London, UK Posts: 305 Drives: 2017 Nismo 370z 6MT Rep Power: 3369	This is still happening, will upload photos and details later on today, just finished chatting with Chris in Germany, extremely nice guy!!! JARblue likes this.

06-06-2014, 02:24 AM	#3 (permalink)
370Z JT A True Z Fanatic Join Date: Jan 2010 Location: United States Posts: 2,905 Drives: 370Z PW 7AT Rep Power: 380	Im interested! __________________ Click for My Journal Top Secret \| EVO-R \| Fujimura Auto \| Shine Auto \| Seibon \| MRWorks \| Swift \| SPC \| SSR \| UpRev \| Project Kics \| NST \| Titek \| Eibach \| Nismo \| Whiteline \| Quaife \| Invidia \| Fly1 \| CF Element \| Carbon Signal

06-06-2014, 07:10 AM	#7 (permalink)
Jordo! A True Z Fanatic Join Date: May 2010 Location: nirvana Posts: 6,394 Drives: 2023 NATM Rep Power: 420	I am very interested, but it would be nice to see a clear dyno of before and after EDIT: Meaning after tuning. I still only see the original dyno, untuned. Also, would this include a modified strut bar or is the end-user on his or her own on that? Otherwise -- congrats to Chris for successfully completing the project! __________________ Enjoy it. Destroy it. Last edited by Jordo!; 06-06-2014 at 07:20 AM.

06-06-2014, 07:21 AM	#8 (permalink)
Rangerz Enthusiast Member Join Date: Jun 2013 Location: Northern Utah Age: 61 Posts: 476 Drives: 2012 370 Nismo Rep Power: 14	Im interested as well but, want to see price and dyno sheets like everyone else. Also what time frame for production after you lock in the list? __________________ Stillen Gen III/ NST/ Fast Intentions Non-Res HFC & 12" Resonated CF TDX/ Setreb series 9 OC/ SPL upper control arms/ Whiteline front & rear swaybars/ Uprev tuned by Seb@specialtyZ/ 319HP 262TQ/ Z1 PS Cooler/ Z1 SS Premium break lines/ CJM Road Race pump/Carbotech F:XP10 R:XP8 Nismo OC DIY

06-06-2014, 02:35 PM	#13 (permalink)
binary0x01 Track Member Join Date: Jun 2012 Location: Idaho Posts: 892 Drives: 2012 6-SPEED 3.7L Z Rep Power: 16	Interested, intrigued, in... __________________ Tune (by Seb@SpecialtyZ) -- Upgraded Parts List : When in doubt, use brute force; if it doesn't work, you aren't using enough.

06-06-2014, 02:27 AM	#4 (permalink)
octet Enthusiast Member Join Date: Jul 2013 Location: London, UK Posts: 305 Drives: 2017 Nismo 370z 6MT Rep Power: 3369	1. octet 2. 370Z JT 3. 4. 5.

06-06-2014, 02:31 AM	#5 (permalink)
Cell A True Z Fanatic Join Date: Jan 2010 Location: Chicago Posts: 1,449 Drives: A Garbage Truck Rep Power: 23	Depending on cost I may or may not be interested. Will wait before putting my name on the list. Sent from my Nexus 5 using Tapatalk 4

06-06-2014, 05:25 AM	#6 (permalink)
octet Enthusiast Member Join Date: Jul 2013 Location: London, UK Posts: 305 Drives: 2017 Nismo 370z 6MT Rep Power: 3369	Thanks Cell, will try to get price estimate early next week. Chris is working on it this weekend. Anybody else interested?

06-06-2014, 08:25 AM	#9 (permalink)
octet Enthusiast Member Join Date: Jul 2013 Location: London, UK Posts: 305 Drives: 2017 Nismo 370z 6MT Rep Power: 3369	It's not a final list guys, just express the interest so we gather an idea of how many we might need. This way we can negotiate with the CNC shop to get parts sourced at a better price. I'll ask Chris to source prices for everything, including the strut bar. 1. octet 2. 370Z JT 3. Cell 4. Jordo! 5. Rangerz 6. 7. 8. 9. 10.

06-06-2014, 11:16 AM	#10 (permalink)
merkil Base Member Join Date: Oct 2013 Location: Brantford, Ontario Posts: 63 Drives: 2011 370z Rep Power: 13	Subscribed for pricing details. From 2011 till now. Just amazing. Sent from my iPhone using Tapatalk

06-06-2014, 02:02 PM	#11 (permalink)
octet Enthusiast Member Join Date: Jul 2013 Location: London, UK Posts: 305 Drives: 2017 Nismo 370z 6MT Rep Power: 3369	1. octet 2. 370Z JT 3. Cell 4. Jordo! 5. Rangerz 6. merkil 7. 8. 9. 10.

06-06-2014, 02:13 PM	#12 (permalink)
Benci Base Member Join Date: Sep 2011 Location: New Iberia Posts: 16 Drives: 2011 370Z solid red Rep Power: 15	hmmmmm interesting........as long as the price is right......add me to the list

06-06-2014, 03:26 PM	#14 (permalink)
octet Enthusiast Member Join Date: Jul 2013 Location: London, UK Posts: 305 Drives: 2017 Nismo 370z 6MT Rep Power: 3369	1. octet 2. 370Z JT 3. Cell 4. Jordo! 5. Rangerz 6. merkil 7. Benci 8. binary0x01 9. 10. Good stuff, we should be able to get this a lot cheaper if we can order like 10-15 kits at least. Keep expressing your interest guys, I know we don't have a price tag yet, but we should have it pretty soon, as I said.

06-06-2014, 05:55 PM	#15 (permalink)
Rusty A True Z Fanatic Join Date: Dec 2011 Location: Fayettenam,Pennsyltucky Age: 70 Posts: 35,579 Drives: 2011 Nismo GM 6M Rep Power: 2684440	Interested. Depending on the price and dyno sheet. __________________ 浪人 - 殺し屋 "The Difficult Anytime, The Impossible By Appointment Only" http://www.the370z.com/members-370z-...o-journal.html

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