Fogging Your Airbox (1998 318ti) I just wanted to give a small walkthrough to the folks who have thought about fogging your airbox and havent quite gotten to that point because of any particular reason. The following modification was done on my 1998 1.9L 318ti. But before we get started, here's some info that you need to know about your cars intake and fuel injection system Quote:
Image #1 After I opened my airbox, I noticed some kind of baffling material that seemed to be either heat dampening material or sound dampening material. I dont know what the case may be in your car, but in mine it seemed to have "rotted" out. So i took all that out. Only the part above the air filter was ok. Take a look at this picture. Image #2 And this is my airbox with all that stuff taken out. Image #3 Ok, so once your airbox is out. You need to think about positioning for the tubing that will run from the air duct that leads to the driver side tire (or brakes). When I was doing this i saw that there was a horn in my way. So i relocated it. See these photos. Image #4 Image #5 Image #6 Ok, next is to locate the air duct that is behind the grille to the left of your driver side fog light or fog light cover. You can get to it and take it out if you take off some protective plastic peices underneath the front of the car. Make sure you disconnect the sensor on it before you go yanking away. Here is a pic. Image #7 Now you will have to cut a hole in it. I used 90 degree angled peice of PVC pipe that you can find at any hardware store. I also painted it black. Take a look. Image #8 Now take the tubing you bought (3-4 inch dryer duct tubing, or anything that works for you). Yeah take that tubing and put a tightening clamp on it, then place the air duct back into place. Be sure to pull the tubing through like in this picture, but, keep in my that the airbox should be completely out at this point so you have a lot of space to work with. Image #9 Ok. Now comes the modification on the actual airbox itself. You need to cut a hole in it and add another corner PVC peice to connect to the tube. In this picture the #2 hole is the factory hole that was there when you took the box out. The #1 hole is the PVC peice. Image #10 After that, cut your tubing to the right length, clamp on both ends, put every sensor, cap, plastic peice back on and then you're done. Image #11 Image #12 Image #13 Image #14 After I fogged my airbox i could feel a great deal of difference in the way the car drove. There is no longer that "plateau" or power. The power is constantly there to the redline. Its great, and i suggest anyone doing this performance mod. Thanks. -Sean H. ***THINGS TO KEEP IN MIND*** There are risks in doing this modification. Getting too much moisture in the engine could cause hydrolock. Also be sure to connect every sensor back where you took it off. |
that was a pretty good tutorial! i know i did mine a little differently (didnt actually connect it to the brake duct, just had it down by the foglight), but i like the tutorial...lots of pictures make it easy to follow! |
Yes very nicely done,it looks somple with all the pictures. Only thing i didn't like is that he is a Yankees fan.. :dizzy: |
Yeah, that's a very nice write up! I will do this mod in a couple of weeks. You posted the tutorial in perfect timing. Thanks! |
i noticed you cut the whole in the airbox on a different side... did you use anything to plug up the stock hole so it only sucks air from the new hole, or does it suck air from both? and i like the idea of using PVC pipe for connectors....very nice! i found that the originial tutorial for the 'fogged' airbox was a bit vague and didnt have too many pictures...i was able to get it done...but i had to really read into what they were saying... this tutorial is REALLY nice, pictures every step of the way! i like! |
Yes, i reconnected everything back to stock, which means i have 2 holes in my air box. It can breathe from the stock inlet also the new one. I haven't driven in the rain yet and i'm a little nervous about hydro lock. If one of the guys on this forum that has a little experience in hydro lock and how easily it can happen, would you please post a response. Thank. Oh by the way, i can feel a great amount of difference when i drive my 318ti now. I don't exactly get the gas milage i was getting before the mod. lol. (due to me constantly testing out the new feel) |
i am no authority on hydro lock, but i would guess that with two intake pipes, your fogged pipe wont have enough suction to really suck up enough water to cause problems...even if the fogged hose was submerged in water, it would still just suck air from the stock hose to releive the pressure...and if both hoses are submerged...then you must have driven into a lake :) but even so...not submerged...id guess that neither hose has enough suction to really take in enough water to cause trouble but then again, i am no authority on hydro lock....someone correct me if im wrong |
With two tubes at 2 different heights aren't you gonna get cold air and warm air going into ur engine? With one pipe there would be more suction which means more air to go in. |
damn looks like the pictures are down :no: was gonna use that as my guide too |
Very nice job. It is very well detailed and the pictures demonstrate all of the things that you need to understand. Very nice tutorial. :_pelvic: |
correct me if Im wrong but if you are going through all the trouble to fog the airbox why doesnt everyone just get a couple inches of 3' pipe, clamps and a cone filter and just make a full blown CAI. its less restrictive and has a way better sound. |
actually i think that by fogging your aibox it makes more power than most of the the cai. I remember seeing a comparison on it a while back ill try to find it |
What happened to the photos? Sweeet write up... and simple. I want to do this mod but the pictures aren't working. |
Not to sound dumb or like a newbie, but what the hell is fogging an airbox |
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