GT-R R35 Plenum Test Fitment on my VQ37HR

Calvin

subscribed.

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kevr6

Holy!! I'm in!!

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DIGItonium

Any offers for my GT-R intake plenum and engine cover? It's boxed up and ready to ship. Priorities changed, so I won't be able to take on this project.

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VQStryker

I want to see how this works out but I'd consider it. If this works out and shows large improvements, that plenum will become very marketable

ChrisUR

My car is currently not ECU-tuned - it has been dynoed with the stock manifold and my other mods (exhaust, CAI, NST Pulleys) then will be dynoed with the GTR plenum conversion.

I think for most people its interesting how mods can perform just with the OEM Nissan tune, so you can have real bolt-on performance.

Of course I have read the articles in DSPORT where they tested the M370 manifold and found out that a ECU tune is vital to at least restore stock peak performance and have gains in the RPM band.

Depending on how the conversion performs with the stock tune I will then maybe do a custom tune for the manifold to see whats really possible on a NA car if you max out possibilities.

I will report about every step and result in detail when we start testing.

Chris

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wstar

That's not really what I mean, exactly. I guess what I'm saying is, the situation some have observed with the M370 is this: Stock tune before, bolt on the M370, stock tune after, got gains. Dyno-tuned before, bolt on the M370, re-Dyno-tune after, no gains. In other words, the M370's gains were entirely overlapped with effective dyno-tuning, making the mod pointless, especially considering a dyno-tune can be had for far less than the cost of a GT-R manifold and custom extra hardware.

If the GT-R manifold conversion makes true flow gains (as opposed to just tricking the stock ECU into leaner conditions at various points in the rev range), you should be able to dyno-tune a stock car w/ UpRev, install the GT-R manifold, and then re-dyno-tune again and still see gains from the new part.

Sorry for seeming negative, I'm really not . I love the idea of this, and I suspect it's capable of real gains. Just want you to know ahead of time, that's what it's going to take to prove it: either you, or a customer, will have to do that dyno_tune->dyno_test->install_it->dyno_tune->dyno_test process.

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ChrisUR

no problem, I see your point !

what I will do is test the GTR manifold on my car first for fitment, etc. Then I will dyno my car which has the stock tune on it but already other mods like CAI, catback, NST pulleys and compare before and after installation.

If everything fits and the car runs perfectly with the new manifold I will ask one of my friends who will dyno-tune his car with catback and sport cats next week to stop by and have the GTR manifold installed.

He will then go to the dyno again and measure before re-tune, then re-dyno-tune with the manifold and have another dyno pass.

I hope that is what you are looking for !

Chris

@Chrisw
I apologize for not having at least a ball park figure for you currently but today I don't even have a clue how much the fabrication of the flanges plus welding will cost me, so whatever number I give you now I might regret later.

Plus we have never installed at least the (not build yet) prototype so it is possible that during the installation and testing we discover that additional small parts are needed which I will put in the package to give you a real complete bolt-on solution as good as it can get.

Please bear with me for another couple of days - we are almost there and my plan is that before end of January the final product and installation package is ready to be build with prices and dyno results.

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phunk

if it requires a tune to make power, than that means it didnt make power.

these cars are MAF based. any changes in airflow will be detected and compensated for.

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phunk

great design work ChrisUR... i am very very curious to see if there are any gains using the GTR plenum with your lower runner section.

What methods do you plan to use to manufacture this? I would assume billet cylinder head flanges and billet top flange with fabricated tubing inbetween?

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phunk

also, care to share what your runner length within your part is? i have a VHR part and a GTR plenum here so I can compare overall runner length

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ChrisUR

we tried to make the runners as short as possible, but you have to have a certain height of the top flange to make the GTR plenum fit above the valve covers, so the runner lenghts is quite determined by technical limitations.

everything will be made out of aircraft aluminum to save weight. According to the CAD design program the whole part will be around 2.3kg / 5pounds so its slightly more than the stock cast lower manifold.

You are absolutely right, my primary goal is always to achieve performance gains with the stock tune and the ECU re-calibration itself for the higher air flow.

As it is proven to work with e.g. the STILLEN Gen3 this should also work with a better intake manifold design - first dyno tests will show :-)

Chris

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MattP725

Not by any means to be a naysayer but with all the time and development you are spending to make a OEM part fit a different car, why not just fabricate a higher flow manifold to utilize the stock components like fuel system and MAF? Wouldn't that simply things and perhaps save some design cost?

modme

Because GTR FTMFTW!!!!

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ChrisUR

you got me !

of course we could have designed a completely new manifold - but the challenge was to make GT-R fit.

So many people in this forum were talking about this conversion for years and my dream was to finally make this happen.

@indyn
yes, the stock throttle bodies are exactly the same with GTR and 370Z - you can simply bolt them on, all cables and hoses will fit.

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XwChriswX

I know its still very early in the development and production of this, but for all those wondering if their wallets can support this... has there been any talk about pricing yet? Or has that even been thought of. Not looking for something exact of course, but maybe a ballpark figure just so people can think about their finances because there is obviously a high demand for this part right now. And it will only grow once it's released, bolted on, and looks and performs miraculously.

Just trying to get a guesstimate... Are we talking $1k, $2k, $3k range?

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