<center><img src="http://pictureposter.audiworld.com/711/vstacksecondary1.jpg"></center><p>Here's a couple pics of the velocity stack in the TB secondary. Due to slower air thru the secondary I'm able to taper the walls at a slightly steeper angle. This sleeve is just siliconed in lightly with some hand-cut foam wedjes between the two bores to prevent air from being sucked between the walls of the sleeve and the TB bore in case the silicone isn't enough to hold it or a complete seal. I have to be able to get this sleeve in and out so I can't mount it in any permanent way until it's proven to work.

I have a strong gut hunch what will happen on the flow bench but no idea as to final numbers. FYI: the bore diameter in the secondary has now been reduced by a hair over 17.5% from the original TB's stock bore diameter.

Can you guess what will happen and do you think it'll flow better, worse or about the same?

<center><img src="http://pictureposter.audiworld.com/711/vstacksecondary2.jpg"></center><p>

What I think is a good idea, is to flow bench the TB with the Plenum attatched and the flow through the both of them. So this way its going to measure flow the way it would be in the car instead of putting it straight down through the TB ports. The flow of air coming down and around the plenum will have a different flow effect than just straight through the TB itself.

I think a good way to do a TB is to find the strongest flow path coming down the Plenum and to accomodate the TB ports to this path.

Maybe im just over thinking, the air really has nowhere else to go, just lesser restriction is what were trying to get at.

Thus, the amount of air you have available prior to the TB and the ease at which the engine pushes the exhaust gas out of the chamber to create a stronger vacuum will have a great effect on the flow throught the TB. When testing, accounting for the pressure on both sides of the TB would give you some really interesting information on air flow.

I can foresee the air flow through at 17% reduced secondary valve both increasing or decreasing depending on the surrounding air pressure, just like how the fluid dynamics in an exhaust system or even a wind instrument can vary depending on pressure.

<img src="http://pictureposter.audiworld.com/21601/collector_1.jpg">

Just need those Brullen DP's and exhaust now.

velocity stack on the secondary runners - just spit the intake manifold, you'll see what I mean ;)

My main goal was to keep intake temps down as much as possible. Being that theres a 900 degreeF exhaust manifold inches away, I used the stock airbox.

<img src="http://pictureposter.audiworld.com/21601/collector_3.jpg">

Not really the best pic but you can see the pipe going in from the bottom.
<img src="http://pictureposter.audiworld.com/21601/inatke_3.jpg">

For the collector, I used a piece of 45 degree roof pipe plange from home depot. ;)

Heres what it looks like from behind and underneath.

<img src="http://pictureposter.audiworld.com/21601/intake_2.jpg">

<img src="http://pictureposter.audiworld.com/21601/piping_back.jpg">

<img src="http://pictureposter.audiworld.com/21601/piping_bottom.jpg">

Id say intake temps were just about sliced in half, especially at highway speeds. I dont have any rain or water problems which was my main concern, the one problem that I do have is trying to keep the dirt out.

Being that that thing sucks up so much air, it also brings in alot of dirt. I opened up the box the other day and was forced to clean it out due to all the **** on the bottom.

Id say it was more than worth it. No hot air going into the car a good collector and all for under 15 bucks. ;)

I have something similar but without a good collector.

Im sure you can find someting at Home Depot. ;)

I used the 2" because I had it laying around but I was thinking about going bigger sometime. =)