VWDiesel.net The IDI, TDI, and mTDI source.
General Information => FAQ/Tech Tips/Please Read First => Topic started by: subsonic on March 02, 2009, 11:19:23 pm
-
I saw this onlne while doing some research and thought it might help people with a visual on the dual plenum intake idea. Please feel free to add any good info you might have on this. Slap this on a modded 1.6 n/a intake perhaps?
(http://i239.photobucket.com/albums/ff120/subsonic44/dualplenumphoto.jpg)
-
Thats a very interesting picture. I'll have to study this a bit.
-
Any research/science behind it ?
-
Some here, some there.... Here is what I have boosted.
"The concept behind a dual plenum manifold design is to equalize intake runner velocity, regardless of each runner’s distance from the throttle body, thereby ensuring equal air/fuel ratios in each cylinder. Complex engine dynamics such as intake pulse reflection and rpm resonance are also much less prone to interference from incoming intake charge simply due to the fact that the upper plenum is ‘separated’ from the throttle body.
The lower plenum serves as an air distributor which tapers to increase intake velocity towards the aft side of the plenum. It feeds air into an even gap that runs the full length of the plenum causing the air to "distribute" evenly into the upper capacitance plenum. The cross-sectional area of this gap is roughly 110% of the cross-sectional area of the throttle body opening which allows for an equal distribution of intake air with a safety buffer to insure absolutely no intake restriction."
"A brief synopsis of the intake manifolds used on the Audi Rally Cars and into the VAG turbo competition cars of current day. "
http://www.bufkinengineering.com/intake%20manifolds.htm
-
I meant about the one in the photo. Anyone can weld a couple of tubes together, but with what math/ proof behind what they are doing.
-
I looked for a while via google about the mathmatic formulas for setting up the dual plenum. I have not found it yet. I have no dobt it is out there but at this point it has eluded me. However, once I get interested in something I tend to fixate on it until I develope a good knowledge base on it. Might not be fast but I eventually will get there.
-
That AKI dude that posts in TurboJ 's thread in the IDI section knows how to make them. I am sure he would have the formula(s).
-
You could just do like this guy,
http://jalopnik.com/photogallery/epicfaildiyturbo/1007634918
-
Don't even know what to say about that.
-
Wow... i just looked at every picture in that gallery... so i went out side and hugged my head and turbo in the driveway at 1am. And softly whispered "It's ok baby... you're with me. I'll keep you safe."
-
Wow... i just looked at every picture in that gallery... so i went out side and hugged my head and turbo in the driveway at 1am. And softly whispered "It's ok baby... you're with me. I'll keep you safe."
How does your gf feel when you talk to your car that way and not her?:shock: LOL
I too looked at all those pictures and WOW..
Dual plenum looks pretty cool, i get what there trying to do behind it. NOICE
-
Anyone know what those Passenger Performance manifolds look like inside?
-
Yeah right thats top secret info just like the cam grinds. Even though he doesn't sell any of it anymore. Funny though, TT shows all the specs to their cams.
-
I looked for a while via google about the mathmatic formulas for setting up the dual plenum. I have not found it yet. I have no dobt it is out there but at this point it has eluded me. However, once I get interested in something I tend to fixate on it until I develope a good knowledge base on it. Might not be fast but I eventually will get there.
I found this thread while doing some searches of the past. ot specific to the dual plenum, but definetly related:
http://vwdiesel.net/phpBB/viewtopic.php?t=209&postdays=0&postorder=asc&highlight=weight+rabbit&start=0
-
why would you need a dual plenum on an na? you already have a setup similar to itbs
-
This only benefits turbo cars. When the air is being PUSHED into the plenum, it's very turbulent and doesn't like to make the turn into the runners because of the turbulence. The dual plenum intake straightens out the flow into the runners by making it all go through that slot.
ITBs on turbo cars is pretty useless, since the real reason ITBs make more power is better, more equal intake characteristics. All the ITBs you see people put on cars have the little individual foam filters, but most race ITBs have plenums, and intake length has nothing to do with where the throttle is. A good intake manifold design can make an NA make power just as well, otherwise you'd see lots more street cars with ITBs just so works teams could run them on their race cars. The last time ITBs were put on a street car like one we could afford (ie, not the super cars) was the AE111 Corolla on the 20V 4AGE in the 90s.
-
I did not mean a dual plenum on a N/A , but a dual plenum based on a N/A intake for use on a turbo engine. The N/A intake would flow pretty good with those nice runners.