Huey52

iTrader: (2)

Yes, that's good enough. I purposely capped there to make return to stock easier if desired.

Ross_Dawg

iTrader: (2)

yeah same here

pistonkilla

ok i am slightly confused. I have studied jons diagrams and seen the video and have a question. Does simply caping off the nipple behind the throttle body keep the vfad open since it needs vaccum to close it?

Jon316G

iTrader: (1)

You are correct.
As long as you don't introduce vacuum back into the line, the valve will stay open.

Now... if you only remove the hose behind the throttle body, the valve will stay closed because the VFAD solenoid is closed and keeping vacuum in the line to the actuator.
Two easy ways around this.
1) When you drive your car and take the RPM above 5500, the solenoid will open and release the remaining vacuum in the line.
2)Remove the line connected to the solenoid (line going to the actuator) and you'll hear the vacuum escape. Then just reinsert the hose onto the solenoid so its not dangling.

tksnobords

i have a stock 04 6MT...i have a k&n drop-in filter. should i even bother with this mod?

Jon316G

iTrader: (1)

Its totally up to you.
Nice thing is, if you cap the nipple behind the throttle body to keep the VFAD open at all times and you find out a few days later that you don't like it, just remove the cap and reinstall the hose.
Very easy to go back as long as you don't remove anything like the solenoid, vacuum chamber, and the one-way valve.
Then if you do like the "mod" and want to remove the components (to make it look cleaner), you can do that.

pistonkilla

ok, i went out to do this and my throttle body does not seem to have the nipple or hose running down as shown in you're pics/diagrams. Very strange, as theres just nothing there on that side. I will try to post pics tom of my throttle body. I have a 05 if that helps at all.

Jon316G

iTrader: (1)

^Do you have a 4-port engine?

pistonkilla

i beleive so but im not sure. how do i tell? srry i just got my 8 not to long ago and i am still learning alot. but im pretty sure it's not 6 port. thanks for the help!

Jon316G

iTrader: (1)

The 4-ports didn't have a VFAD installed... so if you don't have that nipple behind the throttle body, more than likely its a 4-port.

Spinning Sushi

iTrader: (21)

They have the FAD (Fresh Air Duct) but not the VFAD (Variable Fresh Air Duct).

Jon316G

iTrader: (1)

Correct.
This was posted earlier in this thread:

The FAD is the tube running off to the left and the VFAD is the piece facing forward with the actuator attached to the right side.
The 4-ports don't have the VFAD part installed.

pistonkilla

gotcha. however, when i hit 4,300 rpm (automatic) it definitely gets alot louder and revs quicker. is this some variation of vfad or is that just the nature the 4 port renesis. i have always been told thats the vfad opening

edit: ok so i have a fad, not vfad. does this mean since its not "variable" it's always open?

Jon316G

iTrader: (1)

If you have an '05 auto, you don't have a VFAD.
The VFAD normally opens at 5500rpm (if you have it), the SSV (secondary shutter valve) opens at 3250rpm which is on all models.

Jon316G

iTrader: (1)

You don't have that whole VFAD piece/body there.
Its just the FAD tube straight into the engine bay.

pistonkilla

ok. thanks alot for the help

Jon316G

iTrader: (1)

No problem.
I did a quick and dirty Photoshop job on the pic above to show the FAD (without the VFAD).


Its not exact but close enough.
I couldn't find a real pic quick enough

Red_Fox

or you can buy a HKS CF duct thats mounts in front you just drill a hole rx ocho has it on his i'm looking to doing mine too

Jon316G

iTrader: (1)

Or buy a RB duct and you don't have to drill a thing

Red_Fox

^ah true true

vy_MR2

iTrader: (2)

Well today I removed the hose going to the intake and capped it with a rubber grommet (looks like a plastic valve cap) I don't notice any difference in sound but I notice that there is no hesitation around the 5500 RPM mark. Some have said that it should be louder. Just curious if others are noticing the same thing.

Huey52

iTrader: (2)

It's only a little louder, but the biggest benefit is the lack of hesitation where the VFAD would have normally transitioned.

Ban the VFAD.

notorque

keep in mind you have butterfly valves in the intake manifold that open around 5k as well. thats where the stumble is. but when you get rid of the vfad it might help a little to provide less vaccum resistence so it gives the perception of more responce to the motor due to less piping. its like a short ram, works better for top end, cold air long tube works for the bottom end of the range more.

and as for the rb duct, you have 2 full 90 degree bends before it goes into the intake pipe. but if you use a straight forward duct it will help alot more. exspecially on the k/n intake with a surround to provide positive pressure.

Huey52

iTrader: (2)

The in-motion "ram air effect" of the RB duct easily overcomes the slight resistance of the two bends. But intakes are more about suction than intake pressure anyway, in that the engine will take all it can get. Yes I know we talk about FI in terms of "boost" (increased air pressure to achieve denser oxygen rich air) but our, and most other, engines run starved for air as stock.

Also keep in mind the 2nd set of injectors that come into play around 5k rpm. Removing the VFAD won't of course have any bearing on those, but again removing it does eliminate the VFAD shutter transition lag.

Collier's Ride

Could i do this with stock intake flaps removed??? or do i have to have an after market intake? and what exactly do i disconnect? if i cap the lil thingy what else is there to do. i need some specifics