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Zettai Unmei Mokushiroku
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Discussion Starter #1 (Edited)
PERFECT CAI (Hybrid Aftermarket Intake/Stock Airbox Mod)

If your car is having bogging and hesitation problems and you have an aftermarket intake (cold air or short ram), this is the answer you've been looking for!

Reason For Bogging/Hesitation
Aftermarket intakes use larger piping (usually 2.75" vs stock 2.5"). This is supposed to allow more airflow, but unfortunately, our mass airflow sensor (MAFS) is tuned to read air through a 2.5" pipe. Increasing the size of the pipe actually slows down the air speed, since our engines can only take in so much air. The lower air speed makes the MAFS think less air is coming into the engine. This results in the engine getting less gas than needed, making it run lean. This will cause the engine to bog at low RPMs, hesitate during normal driving RPMs, and reduce overall engine power output. It can even lead to check engine lights (CELs), with the code of P0171.

Reason Why This Modification Works
This modification replaces the aftermarket intake's MAFS mount with the stock mount. The piping inside the stock mount is 2.5", so it allows the MAFS to read the incoming air correctly and provide the engine with the proper amount of fuel. It combines the best characteristics of the stock airbox (proper airflow speed) and the aftermarket intake (low restriction airflow) to provide maximum power gain.

Will My Intake Work With This Modification?
Yes. :) This modification has been tested sucessfully on the AEM Gen 1 CAI/eBay CAI, the Injen short ram, and the RMM short ram. It will also work with the Injen CAI/APC Intimidator CAI, K&N CAI and short ram, and PHR CAI. As long as the intake's pipe has a constant diameter, this mod will work. The exception may be the Iceman intake, since its diameter continually changes over the length of the intake.



INSTALLATION INSTRUCTIONS (shown on eBay CAI)

Parts Required

Stock airbox
Aftermarket intake
Flathead and Philips screwdrivers
Power saw or Dremel
Pipe cutter (optional)
File (optional)
Pliers
Epoxy
Power sander
80 grit sandpaper
600 grit wetsanding sandpaper
Spray paint
Knife or strong scissors
45 degree silicone coupler (optional)
Straight silicone coupler (optional)


 

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anyone know if this mod passes smog?
this seems like a very good mod. I just want to pass smog with it, when i cut up my only stock intake
 

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00 LSM GTS said:
anyone know if this mod passes smog?
this seems like a very good mod. I just want to pass smog with it, when i cut up my only stock intake
Doesn't affect emissions any differently then the CAI you're using.
 

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Well i got bored, and was tired of check engine lights with my injen sri. So i got on ebay and bought a CAI for 44 bux shipped. I spent about an hour choppin and refinishing my MAF tube, and about a half hour cuttin the new cai. Install took me about 3 hours or less, and im very happy with the results. No more check injen light, barely any bogging, and a bit more noticeable power in 1-3 gears! This mod is one of the best things ive done so far. I gotta give it up to Blue for figuring out this crazy little trick. Although i do need to get a little sound dampening for my wheel well, to block out water, and calm down the crazy loudness on the drivers side from the new cai. Now i just have to give it the test of time, and see how it all goes from here. Ill let ya's know!
 

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get a cel light over the weekend, checked it out and one of my couplers seemed loose, tightened it up and reset ecu. Seemed fixed. Now i get another cel light today, kinda gettin pissed off. Gunna go scan the code and see whats up, if u have any ideas, let me know!!!!
 

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ok its a p0441, which is a EVAP Emission control system purge flow fault. I have no idea what that means, do u guys have any ideas what would be wrong with my install to set that off, cuz i got that code with my injen SRI also, and i need to get it fixed!!!!!!
 

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sounds great have the cai and gettin ready to do the mod, but i was wondering how many of you guys have managed this without check engine lights? because i def don't want any of that
 

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one question...

the MAF is going to read air from the aftermarket pipe wich is probobly bigger than 2.5

get my drift?
 

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Wakenthefallen said:
one question...

the MAF is going to read air from the aftermarket pipe wich is probobly bigger than 2.5

get my drift?[/QUOTE

Wrong, the MAF is mounted in the stock location using a piece from the stock intake box. It will be reading airflow at 2.25" dia.

I just did this mod last week and I have to say that it does appear to improve driveability and power. My pulls have been much stronger since this mod and to answer Spikeman's previous question, no I have not had any CEL's nor have I ever.

Nice work Bomber!
 

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Sorry to revive a dead thread, but I performed this mod in the early winter, and through a little swearing and patience I got it to fit right and look good. After driving it I could instantly tell that the hesitation and bogging was gone. My celi is actually a lot easier to drive around town, especially coming out of driveways and intersections. I would recommend this mod to anyone with a CAI or a SRI. I had the latter.
 

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I started getting everything ready for this mod.. I don't have bogging problems or anything, just wanted to get rid of the CEL (Check Engine Light) I figured was being caused by the CIA. When I got the stock piece ready and put it up to the Injen CIA I have, I noticed with mine, they were the exact same size around.. Didn't they make a 2nd gen intake specifically for this problem? Just wanting to make sure because I don't think I need this mod.
 

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...It's CAI not CIA

and I don't think injen ever made a gen 2? that was AEM...

it's the diameter in the center of the piping that you're worried about,

i did this mod and it got red of my CEL and all the other problems with CAI/SRI's.
 

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It's Rid not Red. ;)
 

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I did this yesturday and the write up helps alot! No more bogging at low rpms. Thanks
 
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