Free Cold Air
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Joined: Feb 2006
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Free Cold Air
I just did a mod on my 09 C6 A6 base, pulling the plastic fasteners out of the lower cowling going to the air cleaner and creating a gap for outside air to enter the intake air filter area. I did this on my 06 and all was fine. However, after a test ride today after doing this on my 09, I noticed a roughness or hesitation on steady throttle and deacceleration. Does this make any sense, is the location of the MAF a factor and is it that sensitive?
Any input or suggestions would be appreciated, thanks.
Any input or suggestions would be appreciated, thanks.
Safety Car
Joined: Nov 2007
Posts: 4,433
Likes: 873
From: Bay Area CA
I just did a mod on my 09 C6 A6 base, pulling the plastic fasteners out of the lower cowling going to the air cleaner and creating a gap for outside air to enter the intake air filter area. I did this on my 06 and all was fine. However, after a test ride today after doing this on my 09, I noticed a roughness or hesitation on steady throttle and deacceleration. Does this make any sense, is the location of the MAF a factor and is it that sensitive?
Any input or suggestions would be appreciated, thanks.
Any input or suggestions would be appreciated, thanks.
Racer
Joined: May 2009
Posts: 389
Likes: 0
From: Staten Island NY
Would using the free air mod, in addition to a cone filter like airraid on a LS3 be ok? Would having a cone filter as opposed to the stock air unit smooth out and reduce the turbulence seen when using the stock intake???
Safety Car
Joined: Nov 2007
Posts: 4,433
Likes: 873
From: Bay Area CA
I actually made two elongated holes (about 6" long) at the bottom ends of my shroud to allow cold air to flow directly into my my air filter. This mod is recommended on Jim Hall's website for Halltech's Killer Bee/Beehive intake setup, which I have. I also re-installed the stock LS3 intake with the open holes in the shroud and it runs fine. I have no problems with hesitation, surges or CEL's. It's actually a great way of getting cold air using the stock intake. Keep in mind, this mod worked for me, I do not claim it will work for everyone. The stock LS3 air filter is a good unit, I do not know if you will be gaining any hp using the cone filter setup.
Race Director
Joined: Apr 2008
Posts: 17,373
Likes: 6
From: Chatsworth California
It seems that the 08's and 09's MAF sensor are sensitive to turbulent air flow causing surges and issues similar to what you are experiencing. The MAF sensor prefers an even flow of continuous air, such as, some of the aftermarket cold air intakes (CAI). However, there are downsides to some CAI, water ingestion and design quality in some units. Do your research. The stock LS3 air filter is actually a good unit, just lacking cold air.
Racer
Joined: May 2009
Posts: 389
Likes: 0
From: Staten Island NY
I actually made two elongated holes (about 6" long) at the bottom ends of my shroud to allow cold air to flow directly into my my air filter. This mod is recommended on Jim Hall's website for Halltech's Killer Bee/Beehive intake setup, which I have. I also re-installed the stock LS3 intake with the open holes in the shroud and it runs fine. I have no problems with hesitation, surges or CEL's. It's actually a great way of getting cold air using the stock intake. Keep in mind, this mod worked for me, I do not claim it will work for everyone. The stock LS3 air filter is a good unit, I do not know if you will be gaining any hp using the cone filter setup.
