Custom Intake

[YarisGuy]

Originally Posted by fu_im_from_texas

The velocity of air passing through the intake does not flow at a uniform speed. At the edges of the pipe the velocity of the air is 0 (theoretically), as shown in the figure below. For more info, do a google search on "no slip boundry condition" or "velocity profile."

The MAFsenser is calibrated for the velocity of the air at the center of the pipe...

pm me if your interested in suggestions to maximize air flow...i have studied the topic extensively...

Excellent post. Thank you for the pics!

[PetersRedYaris]

Originally Posted by fu_im_from_texas

Clarification: Center measured along the diameter, not the length...

This is more clear than my statement, but is exactly what I meant.

[07typeS]

yea but like what was noted before, the stock maf sensor is located in the upper air box lid. So your thought of the maf HAVING to be located in the dead center of the piping isn't entirely accurate. It may be perfect in a perfect world, but we all know it aint true.

I unhooked the battery lastnight and it threw a code on my first decent trip this morning which was less than 30 miles....

when i try and check the code, my little unit doesnt give me anything. I doubt the maf being mounted upside down makes any difference, yes it is flowing in the same direction as stock. I made sure I kept that the same.

chino, if you have any ideas for me as to why the cel light is coming on id really appreciate it. If you need me to take more pics just let me know.

[fu_im_from_texas]

Originally Posted by fu_im_from_texas

i think the maf wont see as much air, the computer will see that the airflow falls outside the acceptable tollerence, and a code will be thrown...

Originally Posted by 07typeS

...it threw a code on my first decent trip this morning which was less than 30 miles....

if i get any better at predicting the future, im going to have to apply for a crystal ball permit...

[Black Yaris]

Hmm.... same problem I ran into while trying to modify my TRD intake.... How about we just wait for Chino

[Katana]

Originally Posted by PetersRedYaris

Nice job. What is your MAF sensor mounted in? In case you didn't know, it needs to be mounted so the actual sensor is exactly in the center of the pipe.

More than correct!

[07typeS]

lol, all of you guys telling me it has to be mounted dead center of the pipe, go out and take a good look at where the maf sensor is located. Its mounted on the airbox lid, not on the 2.5" accordian tubing, so that theory shoots it out the window....

I open for ideas though, maybe the maf sensor has to be located a little closer to the throttle body? because of the open air filter? thats something i may try...

[RShatchback]

Dont give up - you should def. try to move the location of the maf, youll get it..

[Black Yaris]

Originally Posted by 07typeS

lol, all of you guys telling me it has to be mounted dead center of the pipe, go out and take a good look at where the maf sensor is located. Its mounted on the airbox lid, not on the 2.5" accordian tubing, so that theory shoots it out the window....

I open for ideas though, maybe the maf sensor has to be located a little closer to the throttle body? because of the open air filter? thats something i may try...

It is not on the according tubing because the actuall air source is under the headlight.... like I said it was a similar problem I had while trying to modify my TRD CAI into a short ram... I kept throwing CEL because the MAF postion was for long tubes..... I am not saying I am an expert, I just know what does not work, can't tell what will

[fu_im_from_texas]

Originally Posted by 07typeS

lol, all of you guys telling me it has to be mounted dead center of the pipe, go out and take a good look at where the maf sensor is located. Its mounted on the airbox lid, not on the 2.5" accordian tubing, so that theory shoots it out the window....

...

you are right when you say a square duct does not equal a circular tube. however, air at standard tempature and pressure can be treated as an incompressable fluid. incompressable fluids have constant volumetric air flow. the maf (in the stock location) measures the flow at the begining of the accordian tube (even though its actual location is in the air box)...which is equal to the air flow at the middle, and end of the tubing.

so, even though the maf is mounted in the air box (shaped like a square) it is actually measureing the airflow at the beginning of the center of the tubing (shaped like a circle)...clear as mud?

hope this is written clearly, and helps get you back on track...driving around in limp mode with a cel sucks...

[PetersRedYaris]

[QUOTE=07typeS;99176]lol, all of you guys telling me it has to be mounted dead center of the pipe, go out and take a good look at where the maf sensor is located. Its mounted on the airbox lid, not on the 2.5" accordian tubing, so that theory shoots it out the window....QUOTE]

Tube length aside, you need to go take your airbox lid off all-together so you can see that it IS mounted exactly in the center (center of diameter) of a plastic tube formed within the lid. Disconnect the accordian style tube and you will see the tip of the sensor dead center.

[Motorhead6T5]

[QUOTE=PetersRedYaris;99270]

Originally Posted by 07typeS

lol, all of you guys telling me it has to be mounted dead center of the pipe, go out and take a good look at where the maf sensor is located. Its mounted on the airbox lid, not on the 2.5" accordian tubing, so that theory shoots it out the window....QUOTE]

Tube length aside, you need to go take your airbox lid off all-together so you can see that it IS mounted exactly in the center (center of diameter) of a plastic tube formed within the lid. Disconnect the accordian style tube and you will see the tip of the sensor dead center.

+1 you could even cut the stock one out to make a maf housing for a cold air intake,if you cut in the right spots it would be a 2.5" diameter tube. Check it out. Just like with the 05 stangs,if you mess with the maf housing size,you need to reflash the ecu with new map. If you want a cia and you want it to work its going to come down to the maf diameter needing to be excactly the same size as stock,till they come out with a reflash device for this car.

[07typeS]

Thanks everyone for the positive comments, i think i may be hacking up the piping i got and moving it away from the filter and closer to the throttle body. I think fu im from texas is right that its seeing too much of the atmosphere and not so much of the turbulance of the incoming air....

unfortunately when doing an sri, you dont have too much room to work with, but I will definately give it a shot...i aint done yet...I wanna R&D this, even if it gives all of us a way to custom make a working intake that wont throw codes....

I aint trying to outdo chino in no way, im not nearly on his level. But i got some inspiration from his attempts. If anyone else has some knowledgable advice, bring it on.

[ChinoCharles]

How about a picture of where/how you have the sensor mounted? Can't see a thing in any of the other pics.

[07typeS]

chino, if you look at the 2nd picture at the bottom of the tubing about an inch or 2 away from the filter, you can see the maf harness and plug. Thats where it is, id say its roughly 1-2 inches from the filter and that may be too close.

So what im gonna do is hack out that middle part between the vacuum line and the maf, leaving enough room on the ends for couplers, and swapping the section with the maf and the piping....

what do you think?

[07typeS]

I went to check out weapon r's site and I noticed how close the maf is to the throttle body. I think thats gonna be my answer right there.

[ChinoCharles]

Originally Posted by 07typeS

chino, if you look at the 2nd picture at the bottom of the tubing about an inch or 2 away from the filter, you can see the maf harness and plug. Thats where it is, id say its roughly 1-2 inches from the filter and that may be too close.

So what im gonna do is hack out that middle part between the vacuum line and the maf, leaving enough room on the ends for couplers, and swapping the section with the maf and the piping....

what do you think?

So wait, you're going to use four couplers?

[07typeS]

Actually it would be 3, one at the throttle body, one between the vacuum'd pipe and maf, and one between the maf and the pipe to the air filter....

Like I have said a million times, this is just a tester piece to get a working intake, after I get the placement of the parts I can do some research on how to get it into one piece or two pieces max.