GT-R R35 Plenum Test Fitment on my VQ37HR

DIGItonium · 04-11-2013, 08:09 AM

If you look at the VR38 valve cover, the oil spout is a separate piece attached to it. It is also angled further away from the plenum. Either that or your options for oil caps are very limited. GTM uses a very compact oil cap. It is ugly, but it clears the plenum. The VR38 engine cover definitely needs to be cut to make it easier to access the cap as well. Otherwise, it'll require removal each time.

Do you have the balance tube attached to the plenum? IIRC, someone posted white papers about the intake design of the VR38. It's crazy, but that tube diameter plays a role in affecting midrange torque. If anything, maybe you can fab a custom tube with an adjustable knob one can use to adjust the airflow through the tube. Just an idea... [shrugs].

ChrisUR · 04-11-2013, 10:57 AM

@DIGItonium

thank you for sharing your thoughts ! You are correct that the oil cap will be a though issue but we will find a solution.

For the balancing tube we will definitely have to fab a custom connection as the stock tube does not clear all the things which are behind the plenum already, most importantly the VVEL motor !

I think we will do 2 options to start with, a pair of block plates to cap the balancing ports and a custom tube which clears with the 370Z engine.

We will then dyno both setups to see how the balancing affects torque throughout the rpm band.

For FI setups you should definitely have the balancing so I can imagine to offer different diameters, e.g. -6AN, -8AN and -10AN so people can play around with these to find the perfect match.

Current time schedule is that we need to weld the lower manifold as one piece and then continue with the fuel setup - this will happen during next week, so more pics are coming next weekend !

Chris

DIGItonium · 04-11-2013, 11:29 AM

Awesome. I wonder what's the difference between fabricating various diameters of the tube versus a fixed diameter with an adjustable valve to control flow across the tube. Who knows, but hopefully it can save you from fabricating various tubes.

BTW, I hope you have a fuel rail setup that can handle at least 650cc. If I were to do this swap with the new rails I might as well grab larger injectors than the ones I have know. I'm currently thinking about the Injector Dynamics 725cc, but others will probably opt for 1000cc.

Reaper42 · 04-11-2013, 03:22 PM

I hope you can actually make this happen in the next couple weeks. I have been itching for some more NA mods to come around since I dont want to go FI due to weight and overheating issues. Thanks for taking this on and hope to see a final product I can buy from you guys soon!

ChrisUR · 04-11-2013, 04:51 PM

@Reaper42
same here - I first wanted to go FI but as I have the 7AT and dont want to upgrade the transmission plus I track the car a lot and am concerned about stability I wanted to max out the NA first. Currently I run headers, cats, exhaust, intake and pulleys and make about 320WHP. The manifold is hopefully the i on the pie which squeezes out the last remaining HPs plus giving a better mid- and end torque. But no question the best benefit will be achieved with this plenum uprade and FI - those guys should see big gains if we made it right.

@DIGItonium
I will investigate if there is a valve that would suit our purpose. If you have an idea what we could use please feel free to share !

For the fuel no worries. We will make a -6AN Dual Rail Setup with DASH fittings in the front. This is completely customable to match any power level up to 800HP and beyond.

The basic setup for NA cars (like mine is currently) will be an Y-adaptor which is connected to the stock fuel pressure regulator and distibutes the fuel evenly to the two rails (remember only 3 injectors are sitting in a -6AN rail. We have build Supras with over 1000HP which are feed by a single -8AN rail with 6 injectors in it !).

The rails will be build so they can take the stock injectors and also every injector which has the same design on the top end. If required I'm able to match the bore for the injector as you wish as every rail will be hand drilled here in our shop.

As the rails have two ports on each end it is even possible to run two separate lines from two fuel pumps (e.g. if you have the CJM fuel pump assembly) to the rails (one pump for one rail) and make the balacing on the other side to even the fuel pressure.

Our setup will also be compatible with fuel return kits where you eliminate the stock pressure regulator and connect either the Y-adaptor to the adjustable FPR or run two lines from the FPR to the rails directly.

hope you like that answer

Chris

roplusbee · 04-11-2013, 08:45 PM

That's wassup! Looks like I may have to really keep my eye on this one now.

DIGItonium · 04-11-2013, 11:45 PM

How about a ball valve? Perhaps a bypass tube around the valve is in place so that air can still flow when the valve is fully closed. This can serve as the default or minimum flow across the tube.

Jordo! · 04-12-2013, 12:32 AM

Nice to see this project is still on

Have you guys flow tested the IM? Does it actually flow significantly better than the Z intake?

Z eliminator · 04-12-2013, 07:08 AM

I have to get one of these's.
great work on the project !!!

Z

ChrisUR · 04-12-2013, 04:34 PM

sorry guys but I couldnt wait any longer to start the building process

here are the most current pictures - hope you enjoy !

first fitment test for the flanges and pipes

point welding the pipes to the lower flanges

next will be welding it all together to have the final prototype piece for installing the GT-R plenum - stay tuned !

Chris

SPOHN · 04-12-2013, 04:36 PM

Damn. You don't play

critical · 04-12-2013, 05:47 PM

I want one. Going to look sick.

tommyguns · 04-12-2013, 05:58 PM

Put me on the list! Nice work.

Ron · 04-12-2013, 06:08 PM

Any rough estimate on pricing? Sorry if it has been asked already.

Z370Z011 · 04-12-2013, 06:59 PM

I wonder what the performances gains will be

04-11-2013, 08:09 AM	#196 (permalink)
DIGItonium A True Z Fanatic Join Date: Jan 2009 Location: Kansas Posts: 3,800 Drives: 09 Z34-TT 6MT Rep Power: 42	If you look at the VR38 valve cover, the oil spout is a separate piece attached to it. It is also angled further away from the plenum. Either that or your options for oil caps are very limited. GTM uses a very compact oil cap. It is ugly, but it clears the plenum. The VR38 engine cover definitely needs to be cut to make it easier to access the cap as well. Otherwise, it'll require removal each time. Do you have the balance tube attached to the plenum? IIRC, someone posted white papers about the intake design of the VR38. It's crazy, but that tube diameter plays a role in affecting midrange torque. If anything, maybe you can fab a custom tube with an adjustable knob one can use to adjust the airflow through the tube. Just an idea... [shrugs]. dirTy_shoeZ likes this. __________________

04-11-2013, 10:57 AM	#197 (permalink)
ChrisUR Base Member Join Date: Jun 2010 Location: Germany Posts: 116 Drives: 370Z Black Edition Rep Power: 14	@DIGItonium thank you for sharing your thoughts ! You are correct that the oil cap will be a though issue but we will find a solution. For the balancing tube we will definitely have to fab a custom connection as the stock tube does not clear all the things which are behind the plenum already, most importantly the VVEL motor ! I think we will do 2 options to start with, a pair of block plates to cap the balancing ports and a custom tube which clears with the 370Z engine. We will then dyno both setups to see how the balancing affects torque throughout the rpm band. For FI setups you should definitely have the balancing so I can imagine to offer different diameters, e.g. -6AN, -8AN and -10AN so people can play around with these to find the perfect match. Current time schedule is that we need to weld the lower manifold as one piece and then continue with the fuel setup - this will happen during next week, so more pics are coming next weekend ! Chris G37sHKS and dirTy_shoeZ like this. __________________ ProStreet N1 exhaust \| ProStreet N1 Y-Pipe \| STILLEN G3 Intake \| NST Pulley Kit EIBACH Pro-Springs \| EIBACH Pro-Spacers \| EIBACH Sway Bars \| SEIBON GT2 Rear Wing MOCAL Oil Cooler 25row\| STILLEN TransCooler \| STILLEN PS Cooler \| STILLEN Front Fascia

04-11-2013, 11:29 AM	#198 (permalink)
DIGItonium A True Z Fanatic Join Date: Jan 2009 Location: Kansas Posts: 3,800 Drives: 09 Z34-TT 6MT Rep Power: 42	Awesome. I wonder what's the difference between fabricating various diameters of the tube versus a fixed diameter with an adjustable valve to control flow across the tube. Who knows, but hopefully it can save you from fabricating various tubes. BTW, I hope you have a fuel rail setup that can handle at least 650cc. If I were to do this swap with the new rails I might as well grab larger injectors than the ones I have know. I'm currently thinking about the Injector Dynamics 725cc, but others will probably opt for 1000cc. __________________ Last edited by DIGItonium; 04-11-2013 at 11:32 AM.

04-11-2013, 03:22 PM	#199 (permalink)
Reaper42 A True Z Fanatic Join Date: May 2009 Location: Chicago, IL Posts: 1,030 Drives: GetLucky370 Rep Power: 18	I hope you can actually make this happen in the next couple weeks. I have been itching for some more NA mods to come around since I dont want to go FI due to weight and overheating issues. Thanks for taking this on and hope to see a final product I can buy from you guys soon! __________________ Sponsor roll call: Get Lucky Brand \| TOYO TIRES \| Element Graphics \| Unique Fabrication Follow on fb- Jon Sackett and Instagram @GetLucky370 GetLucky370

04-11-2013, 04:51 PM	#200 (permalink)
ChrisUR Base Member Join Date: Jun 2010 Location: Germany Posts: 116 Drives: 370Z Black Edition Rep Power: 14	@Reaper42 same here - I first wanted to go FI but as I have the 7AT and dont want to upgrade the transmission plus I track the car a lot and am concerned about stability I wanted to max out the NA first. Currently I run headers, cats, exhaust, intake and pulleys and make about 320WHP. The manifold is hopefully the i on the pie which squeezes out the last remaining HPs plus giving a better mid- and end torque. But no question the best benefit will be achieved with this plenum uprade and FI - those guys should see big gains if we made it right. @DIGItonium I will investigate if there is a valve that would suit our purpose. If you have an idea what we could use please feel free to share ! For the fuel no worries. We will make a -6AN Dual Rail Setup with DASH fittings in the front. This is completely customable to match any power level up to 800HP and beyond. The basic setup for NA cars (like mine is currently) will be an Y-adaptor which is connected to the stock fuel pressure regulator and distibutes the fuel evenly to the two rails (remember only 3 injectors are sitting in a -6AN rail. We have build Supras with over 1000HP which are feed by a single -8AN rail with 6 injectors in it !). The rails will be build so they can take the stock injectors and also every injector which has the same design on the top end. If required I'm able to match the bore for the injector as you wish as every rail will be hand drilled here in our shop. As the rails have two ports on each end it is even possible to run two separate lines from two fuel pumps (e.g. if you have the CJM fuel pump assembly) to the rails (one pump for one rail) and make the balacing on the other side to even the fuel pressure. Our setup will also be compatible with fuel return kits where you eliminate the stock pressure regulator and connect either the Y-adaptor to the adjustable FPR or run two lines from the FPR to the rails directly. hope you like that answer Chris DIGItonium and Reaper42 like this. __________________ ProStreet N1 exhaust \| ProStreet N1 Y-Pipe \| STILLEN G3 Intake \| NST Pulley Kit EIBACH Pro-Springs \| EIBACH Pro-Spacers \| EIBACH Sway Bars \| SEIBON GT2 Rear Wing MOCAL Oil Cooler 25row\| STILLEN TransCooler \| STILLEN PS Cooler \| STILLEN Front Fascia

04-11-2013, 08:45 PM	#201 (permalink)
roplusbee A True Z Fanatic Join Date: Dec 2009 Location: Killeen, TX Posts: 2,360 Drives: 2007 350Z NISMO Rep Power: 22	That's wassup! Looks like I may have to really keep my eye on this one now. __________________ 2007 350Z NISMO #0618: Zerolift \| UPREV \| F.I. \| Greddy \| Competition Clutch \| Injector Dynamics \| Aeromotive \| Pioneer \| JL

04-11-2013, 11:45 PM	#202 (permalink)
DIGItonium A True Z Fanatic Join Date: Jan 2009 Location: Kansas Posts: 3,800 Drives: 09 Z34-TT 6MT Rep Power: 42	How about a ball valve? Perhaps a bypass tube around the valve is in place so that air can still flow when the valve is fully closed. This can serve as the default or minimum flow across the tube. __________________

04-12-2013, 12:32 AM	#203 (permalink)
Jordo! A True Z Fanatic Join Date: May 2010 Location: nirvana Posts: 6,394 Drives: 2023 NATM Rep Power: 417	Nice to see this project is still on Have you guys flow tested the IM? Does it actually flow significantly better than the Z intake? __________________ Enjoy it. Destroy it.

04-12-2013, 07:08 AM	#204 (permalink)
Z eliminator A True Z Fanatic Join Date: Jul 2009 Location: Ontario Canada Posts: 1,659 Drives: 370 Z 7AT Sports Rep Power: 18	I have to get one of these's. great work on the project !!! Z __________________ 12.343 @114.14 . 4.5 stroker motor is now being built. Dec 1 2015.

04-12-2013, 04:34 PM	#205 (permalink)
ChrisUR Base Member Join Date: Jun 2010 Location: Germany Posts: 116 Drives: 370Z Black Edition Rep Power: 14	sorry guys but I couldnt wait any longer to start the building process here are the most current pictures - hope you enjoy ! first fitment test for the flanges and pipes point welding the pipes to the lower flanges point welding the pipes to the lower flanges next will be welding it all together to have the final prototype piece for installing the GT-R plenum - stay tuned ! Chris KaienZ34, Legz and tower74 like this. __________________ ProStreet N1 exhaust \| ProStreet N1 Y-Pipe \| STILLEN G3 Intake \| NST Pulley Kit EIBACH Pro-Springs \| EIBACH Pro-Spacers \| EIBACH Sway Bars \| SEIBON GT2 Rear Wing MOCAL Oil Cooler 25row\| STILLEN TransCooler \| STILLEN PS Cooler \| STILLEN Front Fascia

04-12-2013, 04:36 PM	#206 (permalink)
SPOHN A True Z Fanatic Join Date: Feb 2010 Location: Covington, GA Age: 45 Posts: 14,844 Drives: Waiting on next Z Rep Power: 221	Damn. You don't play __________________

04-12-2013, 05:47 PM	#207 (permalink)
critical A True Z Fanatic Join Date: Oct 2012 Location: Washington Posts: 1,252 Drives: 09' 370z 7AT Rep Power: 15	I want one. Going to look sick.

04-12-2013, 05:58 PM	#208 (permalink)
tommyguns Track Member Join Date: May 2009 Location: New York Age: 64 Posts: 914 Drives: 370Z/Sport/Black/MT Rep Power: 16	Put me on the list! Nice work. __________________ 09 Sport / MB / 6sd / Nismo"R" Intake / Eibach Pro Kit / Z1 25 row cooler / JWT LW FW / New Short Block 3/11/11 /H&R 15fr 20rr/DBA 4000/FI CB with 12"res./Morel/JL/"Division"mod/SPC/EcuTek/M370/ZEX C SHOT/ART's/NRG

04-12-2013, 06:08 PM	#209 (permalink)
Ron A True Z Fanatic Join Date: Oct 2010 Location: Houston, TX Posts: 3,009 Drives: TT '11 PW Nismo #113 Rep Power: 21	Any rough estimate on pricing? Sorry if it has been asked already. __________________ 2011 Twin Turbo PW nismo #113 - My Journal - My TT Build Thread [ GTM GTX Stg2 TT \|\| HKS EVC6 \|\| Custom CarPC \|\| F.I 3'' TDX CBE \|\| SB 6puck clutch/ZSpeed CSC \|\| BC BR Coilovers \|\| SPC camber arms \|\| Work VSS-X \|\| Custom Headlights \|\| PW:JDM CF Covers \|\| Seibon CF Engine Cover ]

04-12-2013, 06:59 PM	#210 (permalink)
Z370Z011 A True Z Fanatic Join Date: Jul 2012 Location: Los Angeles CA Posts: 1,052 Drives: PearlWhite 370z 6MT Rep Power: 14	I wonder what the performances gains will be

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