Ok so looking at my 91 GXE intake I started thinking. I love the idea of the dual log, but one log coming out of one side, the other front the other side, bending nearly 180 degrees to the front, then in front of the TB bending down 90 degrees, to make another near 90 degree turn to the drivers side, then all the other bends in the plastic piping itself, seems like a lot of useless bends. Why not run off the passenger side with both logs, into the dual TB and from that almost a strait shot to the MAF and air box? Might need to relocate some small things that could be moved but seems like shorter distance and less bends would make a pretty big difference. In essence taking the idea behind the 2nd gen intake and applying it to the 3rd get dual log style.
This idea

With this intake


Anyway, I am placing the dual log on a Z31 so I need to do some fabrication anyway, but would put the inlets on what would be the pass side of the intake for that application. I can simply rotate the bottom bend of the intake manifold the other direction and re weld, but the more I looked at it the more I though it seems like useless bends to fit and look good rather than with performance in mind. Not sure if anyone has done this yet, or if any one will even consider it, but thought I'd see if there has baan any thouts or attempts of this before. Any input is welcome.

 

eh, the 3rd gen intake has better torque output than the z31/2nd gen style intake.. only difference between 2nd gen and z31 is the bend at the back. i'm gonna be putting my 3rd gen's engine, including intake and wiring harness, in my z31, and get nistune so the oversize injectors will no longer be a problem plus just generally getting more power from being able to tune properly. only real thing i'm gonna swap is the motor mounts and oil pan.

 

yeah I want the 3rd gen but I think if I can reduce the bends I can gain more response and flow.

 

only one way to find out

 

trust me, I plan on it, only problem is that since it will be going on a Z31 I won't have anything to compare it with. Maybe I can get it flow tested once it's done but does anyone even have flow tests done on a factory manifold? So I'm gonna go ahead and guess no one has tried this yet then. Since this would only require the upper intake plenum could be relatively easy to swap to a different vehicle to compare, but flow tests would be the best way to know, that is if I am able to get them tested. I like #'s over feel.

 

or just relocate the battery. then you can run the filter right to that corner.

 

that would eliminate 2 bends, I'm talking about eliminating 9 bends. I used MS paint to chop and move things around to get a general idea across to the Z31 forums, so I'll post that crappy pic here too, but the TB is on the wrong side in this pic because it'd be intended for the Z31. For a Max it'd be same idea but TB on the other side and shoot a small pipe to the MAF and air filter. At least that's the theory. Here's the example, and please, I know it looks like S***, I used paint and spent all of 2 min to get the idea across, not to be pretty.

 

you could hust make an adapter plate and swap out the upper and lower intake manifold and run it the 2nd gen manifold.

 

the lower manifold will bolt up to my Z, which will allow me to use the 3rd gen upper manifold. I know a lot of guys use the 2nd gen manifold in the Z31 for the direct inlet, so if I can use the direct inlet style on the 3rd gen dual log I think it'd make for some decent power and response. I am also thinking of expanding the log size, they are quite a bit smaller than the Z31 and 2nd gen max intake, though pull air through faster and more evenly, so if I can increase size and flow seems likes a good mix.

 

in order to use the 3rd gen's intake on the z, you need all 3 intake manifold pieces from the maxima, but you need to swap out the upper water neck (the part with the radiator cap, on the z) that bolts onto the lower intake. then you need to find a place to put the CTS. since i'm using a full maxima wiring harness and ECU it'll be a little easier for me than for you, since you have to make it intertwine with the stock wiring and emissions equipment.

 

And damn that setup looks wicked.

 

noone's mentioned the variable intake actuator on the side there, you'd have to remove that

 

why get rid of it? doesn't hurt topend to keep it, and it helps low end when it's working properly.and based on the visual depiction that richard made, you'd be able to keep it as long as your throttle body was on the passenger side of the car.

on a side note... one issue i'm running into (possibly) with my maxima-intake-on-a-z31 is that the maxima-specific fuel rail piping kinda interferes with the z31-specific intake-to-waterpump dump tube, which is mounted inside of the inner timing belt cover instead of looping over top of it like the maxima one does. gonna grab my spare maxima and z31 intakes tomorrow to see if i can make heads or tails of it on my spare motor.

 

i was assuming that it would be modified to have the tb on the right so the filter went the same way as before,

i've got one of these variable intake, i want some sort of over-the-radiator CAI but, that would prove interesting when using an airflow meter

 

maybe.. i mean a 2nd gen intake would probably do that job, but i think that's not what he's going for. either way, a true CAI does little to nothing on these cars anyways.. it's mostly for status, looks, and sound.

 

yeah i'd go for looks sound throttle response,

anyways /threadjack

 

i didn't say anything about throttle response... dunno where you got that from. seriously, 'cold air' intakes don't do jack squat on n/a 3rd gens. maybe a fraction of a percent if you're really really lucky.

 

so i was doing some mockup work on my hybridized z31/3rdgen setup.

from the 3rd gen:
lower intake
fuel rail
middle/upper intake

from the z31
thermostat housing
upper water outlet



..............

everything went pretty well EXCEPT what i thought would cause a problem.. the maxima fuel rail sticks out a tiny bit too far and causes a clearance issue between itself and the upper water outlet. sooo now i have to figure out what i wanna do about that.

from what i can tell, my choice are:

• chop the curvy tips off the front-side of the fuel rail and connect the hose to the straight part and kinda wrap it around the water outlet
• cut off the ends and cap them, and use an afpr with a splitter to split the incoming fuel between the afpr and a splitter that goes to the left and right side fuel rails, like the below pic. basically the fuel in the 2 rails would still have to be up to pressure, because the regulator wouldn't release it unless it was.

 

thanks.



as for this setup on the z31 hybridized motor are you gonna use the maxima low plenum and make a adapter plate??

 

no i'm using the stock 3rd gen lower/middle/upper intake since it has a variable intake for better lowend torque compared to the z31/2ndgen style intakes. i'm pretty much doing the opposite of what Richard is trying to do.. since this is an N/A motor that i will be DD'ing for a little while, i'm focusing on lowend velocity instead of topend flow. i just need to keep the fuel rail from hitting the water outlet, since the z31 water outlet doesn't have a cutout to make room for the rail like the 3rd gen one does. keep in mind this is going into my z31, not going into a maxima.. but i'm using alot of maxima components (intake, injectors/rail, sensors, harness, and ECU to name a few)


however for richard... he could use a 2nd gen lower intake mani with the 2nd gen upper mani as long as the fuel rail would fit, and just swap on the 3rd gen water outlet. the 'flanges' for the water outlets are all the same on vg30e intakes as far as i've seen thus far.