GT-R R35 Plenum Test Fitment on my VQ37HR

DIGItonium

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].

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ChrisUR

@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

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DIGItonium

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.

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Reaper42

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!

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ChrisUR

@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

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roplusbee

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

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DIGItonium

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.

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Jordo!

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?

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Z eliminator

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

Z

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12.343 @114.14 . 4.5 stroker motor is now being built. Dec 1 2015.

ChrisUR

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

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SPOHN

Damn. You don't play

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critical

I want one. Going to look sick.

tommyguns

Put me on the list! Nice work.

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Ron

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

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Z370Z011

I wonder what the performances gains will be