Hello everyone,
My name is Samuel and I recently picked up a 2005 A6 C6 RHD here in Japan and while I intended it to only be a family since its my only vehicle right now I could not resist modding it a little. We all know that itch. Anyways I decided to start with something easily accessible…thats right the intake system. While I am a big lover of going all out crazy on building a Cold Air Intake, I decided to take it easy on this one and just modify the stock air box to be better.
Step 1. Remove the stock air box to inspect it on how to make it better.
http://i228.photobucket.com/albums/ee159/sugerdady20012001/746ABA12-0A7A-4840-B3F9-E382E80DA52F.jpg
http://i228.photobucket.com/albums/ee159/sugerdady20012001/8894522C-389D-4C03-B884-A4ABBBC50784.jpg
http://i228.photobucket.com/albums/ee159/sugerdady20012001/0A7C2AF7-0A0D-4FC1-884F-8A72A946581C.jpg
This little thing is used to help quite the intake system…so of course its going bye bye.
http://i228.photobucket.com/albums/ee159/sugerdady20012001/611F5399-AA48-4DFC-9FD8-7E5FF62503F8.jpg
This little flap thats opened by vacuum on the diaphragm will also go bye bye.
http://i228.photobucket.com/albums/ee159/sugerdady20012001/BC47BCDF-8CDF-4D47-A4E9-1218FE8218D0.jpg
This is the stock intake snorkel that sucks air from inside the fender well into the airbox…this will also go bye bye.
http://i228.photobucket.com/albums/ee159/sugerdady20012001/ADF147B6-0B66-4BB6-894D-AD7191B9E4B1.jpg
Step 2. The MAF…While the stock MAF can be left untouched I decided that the little extra plastic bug catcher inside was a little overkill sooooo…yes thats right It got ganked.
http://i228.photobucket.com/albums/ee159/sugerdady20012001/ED28E8DE-B943-4B62-B26A-9DC8E1A1B025.jpg
http://i228.photobucket.com/albums/ee159/sugerdady20012001/B5B56E50-99E8-445C-B30E-5AC813903D08.jpg
http://i228.photobucket.com/albums/ee159/sugerdady20012001/B968B79B-FCCC-419A-BC75-C5216A8A8C41.jpg
Step 3. I noticed that when the stock filter was removed and the MAF was attached to the air box there was just the right amount of space to put a coupler to attach a different cone filter. But there was these little tabs in the way that had to go.
http://i228.photobucket.com/albums/ee159/sugerdady20012001/BDE8C425-06D8-4B37-BA4D-834A2E3B2EE8.jpg
Next I had to do a little cutting and trimming on some things to make the new filter work but before I get to that let me just show you all some interesting information. I used my OBD2 iphone scan tool to find out what the intake air temps are while driving and while sitting in traffic so I can see how much difference the mods make. SO here are some screen shots of the readings.
This first one was about 10min after start up. Now just to give you an idea of the air temp difference the outside air is 25 degrees Celsius so a difference of 13 degrees. Also notice the timing of the engine at that temp and notice the change from the next couple photos.
http://i228.photobucket.com/albums/ee159/sugerdady20012001/FF40EC59-295D-4374-8BFA-DD0643DFAE68.png
http://i228.photobucket.com/albums/ee159/sugerdady20012001/66A68F99-C635-474D-B710-022F50868A69.png
http://i228.photobucket.com/albums/ee159/sugerdady20012001/526AB3A6-88CD-4F20-B0B8-F233BFF1E226.png
http://i228.photobucket.com/albums/ee159/sugerdady20012001/0F5568BC-BF14-4FE5-B806-D1DEE6F0A024.png
Sooooooooooo we can see there is a HUUUUUGE difference in the timing and air temp as the car heats up to running temp after 30min of running. The outside air never changed temp from 25 degrees but the intake air temp went from 38 not long after start up to 68!!! thats 30 degrees and a difference of 30 degrees of timing to 9. The timing was really retarded to keep the engine from detonating because of all that heat. So needless to say I have my work cut out for me. I will be posting up here again tomorrow after I do some heat wrapping and modding to the intake snorkel to get more cool air into the air box.
Step 2.