Custom Intake

[07typeS]

Well after the obstacles chino ran into, I decided to give it a shot myself. A little custom work, and I was able to to get a SRI installed with no cel codes thrown. Right now its very generic and installed, but I will be working on cleaning it up, changing coupler colors and hose colors.

There is definately a noticable change in sound, mean as shit is how I put it HA! Performance wise I noticed a very small amount at mid and high RPM.

If there is enough desire, I could definately get some of these kits together for anyone who wanted one. Its not gonna be so much involved like chinocharles was, I dont have enough time. But I could definately fab them up if anyone wanted to.

heres some pics.

[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.

[RShatchback]

damn - clean and gets the job done..:thumbsup:

[sboy]

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.

yeah, i'd like to see the MAF sensor too.

[mandriu]

looks like maf sensor on bottom.

[Black Yaris]

Dang Chino's got compitition... but I want to your MAF adapter plate before I call you real compitition

[07typeS]

Its a little off center, can you explain why it needs to be mounted dead center of the pipe? What about CAI's where the piping is longer and you cant get the sensor more centrally located? Do you mean it should be located a little closer to to the throttle body?

Like I said I am not 100% done with it, I wont say I am until I am completely happy with it.

the maf adapter plate lines up perfectly and fits great.

I want to try some more trial and error on the silicone hose, im thinkin a 45 degree angled piece would work better...

when im done I will get pictures together and probably write up a how to piece it together yourself and also offer others who dont have the skills/tools/time to pull it off themselves...

feel free to ask questions guys

[Black Yaris]

I think your placement of the MAF in referance to the throttle body is correct.
what material is it made out of?

[07typeS]

the maf adapter? aluminum....same as the piping.....

[fu_im_from_texas]

Its a little off center, can you explain why it needs to be mounted dead center of the pipe? ...


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...

[Black Yaris]

the maf adapter? aluminum....same as the piping.....

where did you get the MAF adapter and/or the pipe with the adapter already attached?

[Vanderkitten]

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 velicity 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...

Playin' with the big brains now... time for bed!!

[churp]

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


Soooo....you're saying if off center the maf doesn't sense as much velocity and would send less fuel, causing a lean condition?

[fu_im_from_texas]

Soooo....you're saying if off center the maf doesn't sense as much velocity and would send less fuel, causing a lean condition?

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...

just a guess though...depends on too many conditions to make a blanket statement...i think a lean condition would be worst case... :iono:

[fu_im_from_texas]

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

Clarification: Center measured along the diameter, not the length ... clear as mud, right?

[07typeS]

I get you texas, the piping is the same size as the original accordian tubing. the maf adapter plate doesnt look like its any thicker than the stock mount, but then again I eyeballed it. So I will pull the pipe off and check it again.

I was driving on the freeway and either the svs or cel light came on, i tried to check it with my code reader but nothing came up. I unhooked the battery lastnight for 10-15 minutes to see if this would clear it up, we will see.

[ChinoCharles]

For future reference, it will be about 50 miles before your ECU throws a CEL due to anything airflow related. Therefore, to properly test a setup you have to clear the code (disconnect the battery) and drive 50-80 miles before you can say for sure it throws no codes. At any rate, way to be proactive and give it a shot. Good luck!

[mandriu]

fuimfromtexas

the stock maf sensor is at the mouth of the airbox. I think reynold's number would not be significant in a 2.5"ID tube. Laminar and turbulant flow are calculated for use in fluid mechanics. but as an example the chart you have show a coefficient of friction of .04 or four-hundredths. Air probably produces less friction or drag at such low velocities.

[YarisGuy]

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]

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]

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...



...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... :respekt:

[Black Yaris]

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

[Katana]

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]

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]

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=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.+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]

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.

[thewifesyaris]

looks like spectre from pepboys...
i did the same with the plastic pieces for the wifes, but after about ten miles the maf lit the cel. the tubing is too big for the little throttle body. the diagram further back that explains air flow explains it too well.

as for chinos im hoping he is designing something in lines of this so that the engine always graps from a larger pocket of air. if not patiance is fine and if i come to not like yours chino, sorry but weapon-r has a affordable reasonable short ram.

[07typeS]

what do you mean the tubing is too big for the throttle body?? It looks to me that the stock tubing is 2.5" in diameter, the same as the piping im usuing....

[bladesmith6]

Any more luck on your intake?, I'm working on a homebrew myself and wanted to know how your progress was.

[Polish0017]

I'm wondering where you got all your piping from and how much it cost. I tried running over to Pepboys today to see what piping they had for intakes. They had a good selection, but I had the slightest clue as to what angle I should have the elbox at.