cold air intake
1st Gear
Joined: Jun 2010
Posts: 233
From: North Dallas suburb
cheers
3rd Gear
Joined: May 2008
Posts: 1,612
From: south florida
also, skip the oiled filters. Get an AEM dry-flow. With an oiled media filter, the oil is drawn accrss the elements in the MAF and **** up our readings. take out your MAF and soak it in alcohol. see if that helps with the trac control/MAF light. if so, its def your filter. ditch it and go with a dry element filter.
1st Gear
Joined: Jun 2008
Posts: 115
From: Willow Springs, IL
also, skip the oiled filters. Get an AEM dry-flow. With an oiled media filter, the oil is drawn accrss the elements in the MAF and **** up our readings. take out your MAF and soak it in alcohol. see if that helps with the trac control/MAF light. if so, its def your filter. ditch it and go with a dry element filter.
1st Gear
Joined: Jun 2008
Posts: 115
From: Willow Springs, IL
Last edited by A8 LOOONG; Feb 3, 2011 at 12:46 AM.
1st Gear
Joined: Mar 2011
Posts: 4
From: Atlanta, GA
the problem with cold air intakes...
Gay-Lussac's Gas Law states "the pressure of a gas is proportional to the absolute temperature of the gas"
Because all the pressure is created in the turbo... the air isn't heated to extremely hot temps until well after the intake... inside the turbo. any extra length at all added to an intake will reduce flow in some way.... since the CAI won't cool the end result air before entering the engine, the only effect of the CAI is sound and reduced airflow.
The Only real thing you can do to your intake on the 1.8t TT is to add a high-flow intake to increase the airflow as much as possible... giving the turbo more air to compress and 'forced induct' (<-- I realize that isnt a word).
You want to get as much air in as possible... just shorten the intake as short as possible and install the highest flow filter you can find. Usually this is a HKS mushroom style filter, or hollow center cone filter (the solid center cones only draw in from the outside while the hollow ones draw from inside AND out).
Now of course in the winter... colder outside tmps WILL affect the power, but only if the temps are much much lower than summer ambient air. and this is bcause 20-30*F air is very dense with oxygen (freezing cold air = dense with oxygen = bigger bang = more power)
Most CAI's only decrease temps by 5-10*... not nearly enough to create a difference in O2 content.
Gay-Lussac's Gas Law states "the pressure of a gas is proportional to the absolute temperature of the gas"
Because all the pressure is created in the turbo... the air isn't heated to extremely hot temps until well after the intake... inside the turbo. any extra length at all added to an intake will reduce flow in some way.... since the CAI won't cool the end result air before entering the engine, the only effect of the CAI is sound and reduced airflow.
The Only real thing you can do to your intake on the 1.8t TT is to add a high-flow intake to increase the airflow as much as possible... giving the turbo more air to compress and 'forced induct' (<-- I realize that isnt a word).
You want to get as much air in as possible... just shorten the intake as short as possible and install the highest flow filter you can find. Usually this is a HKS mushroom style filter, or hollow center cone filter (the solid center cones only draw in from the outside while the hollow ones draw from inside AND out).
Now of course in the winter... colder outside tmps WILL affect the power, but only if the temps are much much lower than summer ambient air. and this is bcause 20-30*F air is very dense with oxygen (freezing cold air = dense with oxygen = bigger bang = more power)
Most CAI's only decrease temps by 5-10*... not nearly enough to create a difference in O2 content.
neur0tic is the man. Spot on as always. Been reading these forums for years and he's always dropping the knowledge. Had to finally create an account and let him know lol!
1st Gear
Joined: May 2010
Posts: 33
I'll second the oil in the filter problem, in my first week with my tt I cleaned the filter from the modshack intake with that k&n oil cleaner crap...ended up with messed up maf readings and cleaned the maf with a bottle of specialized maf cleaner from crc. Advanced auto carries it.
Thread
Thread Starter
Forum
Replies
Last Post
Sp33d07
Audi A4
1
Sep 3, 2006 05:06 AM
