CJ Motorsports VHR Intake Manifold

Elmo370z

That's awesome. I really hope this intake mani makes a decent amount of power throughout the power band for poor people like me who can't afford boost. I would love to have this piece on my car

Meulen

is there any preference for a local guy, NA Z, to get his hands on one of these?

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Elmo370z

People With Na Z are praying to the gods this mani makes power. If the right engineering goes into the design it will make power for those who prefer to stay NA

FPenvy

i mean we could just crowd fund your zdayz registration fee to ensure we get to see this lol

it's only $50 for the whole weekend

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phunk

That is sort of a matter of perspective. An intake manifold design is a compromise. Adjusting the design will shift around its peformance range. If there was any free horsepower on the table, I can assure you Nissan would have found it before I could.

Since I don't stand a chance at beating Nissan at their own game, the only hopes for gains we have depend on setting different design parameters. It is possible that emissions or packaging forced a compromise on them, but other than that... It's safe to assume that they aimed for the greatest performance possible.

A manifold targetting slightly more torque such as the HR manifold does would create perceived performance gains by increasing power through the midrange, although midrange power doesn't exactly make for a faster car in terms of a drag race, but can make it more flexible and faster around a course.

I tend to be more critical of power "gains" though. I don't care for cooled-down glory pulls, or picking the best out of 12 runs to overlay from the worst of the before. I can't stand that part of this industry, and I am not a fan of people being tricked out of tons of money for a car that is only just barely faster as measured under a microscope. The butt dyno lies to please our pride.

When the time comes I will give you guys the data as it is. I don't think there is an intake manifold that will reasonably fit the engine bay and make great power for the all-motor bolt-on and tune cars. But maybe I just expect too much to personally label "gains".

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phunk

It might come to that but I won't know until right at the moment of. I have decent access to Zs for testing exciting new parts on, it will just come down to whatever car is most convenient and appropriately modified to test on.

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Meulen

LMK, I have an un-tuned 40th with FI CBE/HFCs and a stillen Gen III intake. Glad to help

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bullitt5897

I have my race prepped nismo... We will have everything N/A needed! Plus Z1 is not too far away and we can do videos and dyno comparisons for before and after. Hit me up in PM if your interested.

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Elmo370z

So will the intake manifold be a similar set to 1slow370z gtm manifold?

phunk

How about you bring BOTH your Z's up to Chicago, and we can spend a weekend on the dyno and drag strip!!! Or I guess it would probably be easier for me to just bring a manifold down there LOL.

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phunk

Since my manifold will be multi-piece rather than one solid piece, I will have the ability to alter it a little bit.

My current intentions are to have a long and a short runner version.

1slow370z's manifold has very long runners, which are good for torque. They might even be a little longer than preferred, but unless you go very short, you have to be that long, because you have to put the plenum floor on either side of the intake "cams". the vertical space between the strut bar and the valvecover over the intake cams is too short for a plenum floor.

I believe I can keep stock throttle location, or be so close to it that minimal modification to the intake tubes is required... probably at most just cutting some off and adjusting the couplers.

Something long like the GTM prototype will put the throttles in such a drastically different location, that custom intake tubes will have to be made. Which isnt really a big deal, just worth a mention.

The GTM prototype manifold replaces the stock lower intake manifold (LIM) and goes straight to the heads. This is ideal for a zero-sacrifice manifold. My manifold will be using the stock LIM. Using the stock lower intake manifold reduces costs by not requiring a custom fuel system and custom rails, and will make installation marginally easier. It may come at a cost of a couple HP though. Or maybe not.

They did a very good job on that manifold and while we didnt get to see any isolated dyno runs with it, its obviously working well either way. It would have been nice to see how much it did gain and where the gains came in... but I am going to have to say I doubt that manifold lost any top end over stock, and probably gained a lot of midrange-low. It looks to me like a pretty versatile manifold and should even work well on high HP turbo cars running 8000rpm and below. My only gripe with it is packaging / size, and reduced serviceability. But otherwise as one of GTM's critics to the most personal degree, they did really well on that.

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phunk

I am getting really anxious to start cutting this. I better get off the computer and go get the CNC fired up so I can push through this stuff in line so that I can actually build you guys a manifold. Not to mention, there was recently a fire lit under my *** and I want to get my Z back to the drag strip. That means putting it back together and that means not needing it anymore for intake manifold R&D.

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FPenvy

phunk i don't know much about the cost that goes into the cutting of a billet prototype with a CNC but i'm curious is a CF option could be cheaper? i don't know what that would run either but i saw the AMS GT-R ptroto CF mani and it got me thinking about it.

Attached Images

Alpha_Carbon_Fiber_GT-R_Manifold.jpg (310.5 KB, 51 views)

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bullitt5897

Come on down brother! I am sure Jon@Z1 and I can keep you busy

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bullitt5897

So you would want to cut a billet die for the unit and then use it to make your outer shells. From a manufacturing cost it shouldnt be that expensive but if there are errors it would be catastrophic...

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