1994 G50/Q45 Cold Air Intake prototype finally built

[qsiguy]

I dug out my old OEM airbox and all the related plumbing in case anyone hasn't see everything that is under the bumber and behind the headlight. It's quite a maze of piping.....I'll keep my new CAI over that stuff any day!

[db_autotek]

Here's what Sergeant Domokun and Admiral Ackbar think:

[Q45tech]

Yep years of work by teams of engineers and computer scientists were necessary to create this beautiful functional work of art.

No other company has ever spent the time or money [and never will again] to achieve so close to perfection.

It should be on display in every museum on Earth. School children should be taught that this is one of the highest achievements of mankind.

[qship96]

send it to MOMA in Manhatton to replace the jaguar xke on permanent display for automotive art.

[db_autotek]

Mine is curently owned by the Orange County Waste Management Authority, and is proudly on display at a nearby landfill, underneath a few diapers and a bud light box.

[ponzy]

you got mail. (email got from your profile)

[ponzy]

as i was puffing my last cigarette for the night, i was thinking about a design for the CAI. it's quite newbish but pls care to listen first..hehhee...anyways, the stock air is drawing air from the front bumber entering the hood through an oval shaped opening, right. maybe we can hook up an oval-shaped k&n air filter (inserted to that oval-shaped under headlight)and attached it to the fabricated bead blasted air pipe going to the maf and just remove the stock air passages (the ones you remove and showed picture on the thread., and put some water baffle(entering the engine area) just after the oval-shaped filter or just a filter sock on the filter itself. this way no need to cut just install the pre-fabricated CAI kit.

does it makes sense or senseless?

[qsiguy]

I'm sure K&N, and whoever else, has various shaped air filters. The problem is the filter will get the best cold air if it's located outside the engine bay. To get the filter outside the engine bay the CAI tube must pass through the engine bay somwhere. The OEM opening is about 6.25" wide x 2.5" high at it's widest spot. You can see it in some of my photos above. The 3.5" tube won't fit through there without some modification to the tube or the car. Once through there the space directly behind the headlight isn't very big so the tube will have to go down or maybe towards the grill to find a place to fit the air filter. I'd have to pull my headlight back out and get a better look but I think it's a lot more work for nothing IMO. Plus you also end up with more bends in the CAI tubing, one reason I made it the way I did. The air filter is in a wide open location and minimal turns in tube.

You could do it like PopPop did and just put the air filter in front of the OEM opening but you'll never get as cold of air as you'll get where I put mine. If you want that for simplicity that is no problem to make. I just removed my old one that left the air filter in the engine bay right there and I could always tell a power difference after the car warmed up and engine temps were high.

[heywier427]

a little off the topic your on now, but if you want to dress up/ make look finished, that hole you cut, use door gaurd around the hole. the stuff you can buy at any auto parts store that go over the edge of the door.

my father did it to one of his cars and made it look much nicer. it will seal up that gap a little more too.

nice job and effort.

[Q45tech]

Consider how the fuel pressure DAMPENER works on the input of the fuel rail....................it is controlled by the minute pressure differential just after MAF...[1 of 2 tiny vacuum hoses just after MAF]..............which progressively increases from zero to 14" [~~0.5 psi] from idle to redline [most of this vacuum = lower than atmospheric begins at 4,000 rpm].

So if you reduce the resistance in front of MAF by 4 or 5" H2O you reduce the lower pressure to the fuel dampener............fooling the dampener into thinking your flow is lower [lower rpm].

Never actually measured the fuel rail pressure waves but obviously Nissan would not have included a damper system if it wasn't needed to optimize something.

The air flow is not comtinuous but in pulses as each cylinder opens.

The dampener is their to help control the rail pressure drop at high flow rates when an injector opens then flows.

There are always consequences in any modification.

Visualize as the TB is opened the plenum [vacuum goes away] which closes the fuel pressure regulator in the return line and as the rpm reachs torque peak the pressure dampener opens allowing more fuel into rail.

[bullittandy]

That air box looks like an vestigial organ from a Gary Larson Farside cartoon.

I got slightly nauseated looking at it.

[ponzy]

paypal is ready man, let me know.........all the infos ...thanks

[qsiguy]

I made my new intake with my blow off valve installed so I have my original CAI prototype up for sale if anyone is interested. It's the one pictured below. It is used but I will re-bead blast it and it'll have a new air filter. I suggest picking up a K&N filter "sock" for it but I do not provide it. I plan to sell these, if I go into production, for about $189 but I'll let this one go for $125.

It will not work on the active models because the area where the filter is relocated to is full of active suspension components. You do have to completely remove the oem air box and plumbing, and cut about a 4" hole below the stock airbox location (see page one for detailed photos)



Here's my new one in case anyone wanted to see, I like it

[bullittandy]

I've been wondering what I'm going to get Maxnix for Christmas-now I know!!

[nick701clark]

whats up i been on here from time to time scoping out parts for my q45 in i saw your cold air intake on yours in i was wondering where did you get it or who made it cause i been tryin to get my hands on one for a good minute so if you could help a fellow q45 enthusiest to another I would gladdly appreciate it hit me back

[qsiguy]

If you go back to the beginning of this thread you can get more detail but I fabricated all my own parts for this. I had the MAF flanges cut on a waterjet cutter but I welded up the rest of it. I still have the original prototype shown above. I also have made a few MAF adapters for people with just a straight 3" tube on them.

Here's a pic of that adapter

Also, like it says above, it will not work on active models due to the location of the suspension components.