Airbox flapper question - Mazda 6 Forums : Mazda 6 / Mazda Atenza Forum

Carlb328 · 11-19-2009, 05:34 PM

I have read a lot about the airbox mod, but I am still unclear about the VAD flapper. I am unclear if it has to be completely removed, or just unplugged. If the hose is unplugged will the flap stay open all the time, or would the airflow pull it closed again?

Also, has anyone done just the flapper and still noticed improvement? I am just looking for a small torque increase without making it too loud or anything.

Freak4Dell · 11-19-2009, 08:19 PM

Just follow the writeup as written. It doesn't make it too loud. It makes it slightly louder and gives it a deeper pitch, but only when you step on it. Idle is practically the same.

I also don't really know of any power increase from the airbox mod.

ttshark · 11-19-2009, 09:20 PM

throttle response is definitely better but the power is still around the same. As said it only sounds loud after about 3500rpm depending on your car.

Also, it is in fact the flapper being removed that causes that deep sound. Remove everything else except the flapper and it won't be as loud. Or do as I did and duct all the holes to the front grill and tape off the flapper hole. Sounds almost stock but the cold air intake makes it far more preppy. I made a write-up on it.

http://forum.mazda6club.com/index.php?show...&hl=ttshark

Carlb328 · 11-20-2009, 11:52 AM

QUOTE (CarlB @ Nov 19 2009, 04:34 PM)

Quote:

I have read a lot about the airbox mod, but I am still unclear about the VAD flapper. I am unclear if it has to be completely removed, or just unplugged. If the hose is unplugged will the flap stay open all the time, or would the airflow pull it closed again?

Also, has anyone done just the flapper and still noticed improvement? I am just looking for a small torque increase without making it too loud or anything.[/b]

From what I understand the flapper limits airflow at lower RPM's for emissions, so removing/disabling it should increase torque, am I right?

ttshark · 11-23-2009, 09:01 AM

Yes, the quickest way to notice a response is to remove it entirely. To say that your torque will increase cannot be justified. The car will definitely respond to the initial throttle faster but I believe it is yet to be dyno proven.

The reason I ducted mine was to eliminate heat soak which is what helped me get the fastest 1/4 mile time for a non-turbo 6i on this forum (but then again I have a JDM 6 so it is not right to compare)

11-19-2009, 08:19 PM	#2 (permalink)
Freak4Dell Track Racer Join Date: Dec 2007 Location: Dallas, TX Posts: 810 Thanks: 0 Thanked 6 Times in 6 Posts Groans: 0 Groaned at 0 Times in 0 Posts iTrader: 0 reviews	Just follow the writeup as written. It doesn't make it too loud. It makes it slightly louder and gives it a deeper pitch, but only when you step on it. Idle is practically the same. I also don't really know of any power increase from the airbox mod. __________________ F4D Lighting - Affordable Automotive Lighting DFW (NORTH TEXAS) MEET MARCH 27th!

11-19-2009, 09:20 PM	#3 (permalink)
ttshark Track Racer Join Date: Nov 2008 Location: Sydney, Australia Posts: 405 Thanks: 0 Thanked 0 Times in 0 Posts Groans: 0 Groaned at 0 Times in 0 Posts iTrader: 0 reviews	throttle response is definitely better but the power is still around the same. As said it only sounds loud after about 3500rpm depending on your car. Also, it is in fact the flapper being removed that causes that deep sound. Remove everything else except the flapper and it won't be as loud. Or do as I did and duct all the holes to the front grill and tape off the flapper hole. Sounds almost stock but the cold air intake makes it far more preppy. I made a write-up on it. http://forum.mazda6club.com/index.php?show...&hl=ttshark __________________ 2002 Mazda 6 Limited series 1 Manual 2.3L I-4 Australian Model (Jap Spec) 10:6 High Compression Current Mods: BC Racing Coilovers \| Injen CAI \| Advanced Timing \| Dark Yellow Smoked Fog Lights \| 18" Mazda RX-8 Wheels on Bridgestone GIII 225's \| Raybrig 4500K Pure White Parker/licence/door Bulbs imported from Japan \| Audiolink ipod Connection \| Fluoro Orange Rocker Cover \| Custom Grounding Kit \| Breather Air Filter \| Apexi Turbo Timer \| PCV Oil Catch Can (Still need to install) \| RDA Front Slotted Rotors \| ACRE Super Fighter Pads \| NGK Plug Wires \| 6-SMD Red Interior Map Lights \| Honda S2000 Gearknob Coming SUPER soon: HIDs (Freight Container Arriving Soon) \| Front/Rear Strut Bar \| Exedy Stage 1 Sports Organic Clutch \| Exedy Lightened Flywheel Coming soon: F2 Supercharger kit \| F2 Header \| Custom 3" Catback Exhaust System with High Flow Cat \| Complete Haltech Tune

11-23-2009, 09:01 AM	#5 (permalink)
ttshark Track Racer Join Date: Nov 2008 Location: Sydney, Australia Posts: 405 Thanks: 0 Thanked 0 Times in 0 Posts Groans: 0 Groaned at 0 Times in 0 Posts iTrader: 0 reviews	Yes, the quickest way to notice a response is to remove it entirely. To say that your torque will increase cannot be justified. The car will definitely respond to the initial throttle faster but I believe it is yet to be dyno proven. The reason I ducted mine was to eliminate heat soak which is what helped me get the fastest 1/4 mile time for a non-turbo 6i on this forum (but then again I have a JDM 6 so it is not right to compare) __________________ 2002 Mazda 6 Limited series 1 Manual 2.3L I-4 Australian Model (Jap Spec) 10:6 High Compression Current Mods: BC Racing Coilovers \| Injen CAI \| Advanced Timing \| Dark Yellow Smoked Fog Lights \| 18" Mazda RX-8 Wheels on Bridgestone GIII 225's \| Raybrig 4500K Pure White Parker/licence/door Bulbs imported from Japan \| Audiolink ipod Connection \| Fluoro Orange Rocker Cover \| Custom Grounding Kit \| Breather Air Filter \| Apexi Turbo Timer \| PCV Oil Catch Can (Still need to install) \| RDA Front Slotted Rotors \| ACRE Super Fighter Pads \| NGK Plug Wires \| 6-SMD Red Interior Map Lights \| Honda S2000 Gearknob Coming SUPER soon: HIDs (Freight Container Arriving Soon) \| Front/Rear Strut Bar \| Exedy Stage 1 Sports Organic Clutch \| Exedy Lightened Flywheel Coming soon: F2 Supercharger kit \| F2 Header \| Custom 3" Catback Exhaust System with High Flow Cat \| Complete Haltech Tune

11-19-2009, 05:34 PM	#1 (permalink)
Carlb328 Learners License Join Date: Nov 2009 Posts: 8 Thanks: 0 Thanked 0 Times in 0 Posts Groans: 0 Groaned at 0 Times in 0 Posts iTrader: 0 reviews	I have read a lot about the airbox mod, but I am still unclear about the VAD flapper. I am unclear if it has to be completely removed, or just unplugged. If the hose is unplugged will the flap stay open all the time, or would the airflow pull it closed again? Also, has anyone done just the flapper and still noticed improvement? I am just looking for a small torque increase without making it too loud or anything.

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