GT-R R35 Plenum Test Fitment on my VQ37HR

Mandingo

Well it will sure look cool at least

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some mods

Perf.Des

Also very interested to see the dyno gains. Visually it looks badass. Im guessing that the stock strut tower brace would no longer fit, correct?

hazzazi

Subscribed .... Good luck

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ChrisUR

@phunk
I really appreciate your work (awesome manifold build) and your input - as said earlier it was just like "everybody talks about the GT-R manifold on our cars, but there is zero to none progress, so lets try".

I'm absolutely ready to accept if this conversion does not yield any performance gains on my NA car. But hey, at least I finally tried it so there is a definite answer to the question if and how it works for the VHR.

As for the low end torque design I wouldn't be too angry if it helps our cars in the low end region as this is were we are missing torque the most. As soon as the VVEL kicks in the characteristics of the engine changes completely but before it feels very weak, so any gain here would be appreciated.

My hope with this conversion on the NA car is that it will gain in the low and mid rpm range and still keep the stock manifold numbers in the high end range.

As for keeping the stock lower manifold and modify it thats no option for me as it has square runners while the gtr manifold has almost round runners. When I take the effort of mounting this thing on our car I want to have at least a design which looks like to be the optimum you can do - testing a combination of stock lower and gtr upper says nothing about the potential this conversion may have.

@Bullitt
as said I can't wait to see what GTM finally releases and how they worked around the issues I have found so far. It can't really hurt to have two separat approaches to the same problem and two independant testing results. My build is not intended to be a selling product in the first place, its more like a project I wanted to do - well, if everything is ready and somebody wants one, there's no worries

@Perf.Des
indeed the stock strut brace is also an issue - we tried to sit the plenum as low as possible but because the R35 has no strut bar over the plenum they have not designed it to clear one. When you look at the stock plenum it has a special angle and some kind of notch where the strut bar runs across.

we will either work with spacers or design a new strut bar that goes in front of the new plenum.

Chris

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eastwest2300

Man, that engine is beautiful!!

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cc370z

If the numbers are there I'll be very interested in one. Keep up the hard work! And thank you for taking the time to do this.

AlexRaymond19

Hey man, its worth a try, if nothing else, who else can say they did this? Fantastic work so far! Keep it up! Sub'd

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Perf.Des

I cant wait till this is complete and you have dyno results...if it works I will definately be ordering a conversion from you.

ChrisUR

Hey guys,

sorry for the delay, during christmas and new year the development was suspended but now we have continued to work on the manifold adapter.

In order to make everything fit more easily and to have an extra option for the FI guys we decided to go with new custom made fuel rails. The rails will have a larger diameter and can be used with stock injectors or aftermarket injectors. You can run the rails in stock configuration as a returnless system or easily convert to a dual feed return system.

here are the newest prototype pictures - remember this is work in progress, the final product will look much nicer !

Chris

Attached Images

	adapter.jpg (3.8 KB, 514 views)
	adapter2.jpg (3.3 KB, 505 views)
	adapter3.jpg (3.8 KB, 502 views)

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theDreamer

In for results.

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370ZilverZ

Subscribed. Great thread!

370Z JT

When do you think testing will start?

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shumby

in for results.

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Originally Posted by SAM@GTM
Engine detonation is not normal and it should never never happen, and whoever told that need to do something else for living .
Sam

DIGItonium

IIRC, GTM managed to reduce the installation height. It might be possible to fit the stock strut bar. If not, I'd love to see a CF strut bar like the GT-R.

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ChrisUR

I really hope GTM will reveal their solution as I'm curious how they overcome certain issues I discovered while working on this.

For for installation height there are some key aspects you normally cannot change:
- the manifold cannot sit lower than the stock manifold as the "air boxes" touch the valve covers. Even if you simply place the manifold on top of the engine as I did on one of the above pictures, means in the most lower position you can get with no space between mani and valvecovers the strut bar will not fit.
--> that is the reason why the flange for the GTR plenum needs to be at least 2cm / 0.787" higher to make the mani clear the valve covers

Nissan has designed the stock mani in a special way to fit the strut bar. If you put the stock mani on a table and have the lower flange (which connects to the lower manifold) in a horizontal orientation you will find that the top of the plenum has an angle which makes it lower in the front section. The GTR plenum doesnt have that as it was not designed to work with a strutbar going over it.

We have tried to make the plenum sit as low as technically possible so you might be able to put some thin spacers under the strut bar and make it fit but that has to be tested.

Chris

@370Z JT
the whole CAD development is now at about 80% ready - we hope to finish the design by end of this week so the production of the flanges etc. can start next week. My personal goal was to have the prototype ready and installed for testing before end of January.

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