What do you think of this intake filter gizmo, they claim huge increases!

[turbovanman²]

The theory is logical but I don't see the HP gains on turbo cars or the reduced lag?

http://www.turbohoses.com/velocity_stack.htm

[Tbird232ci]

I don't see why it wouldn't work. You see all the race cars with the bumpers cut out with big ole bell mouths on the turbos, so it has to work at least in some way.

[RoadWarrior222]

I think that might be 5-7HP over the stock airbox...

The best design for that kind of thing is to have a full rolled back trumpet totally inside, protruding into, the area inside the filter, because then it will suck air from behind the mouth.

---------- Post added at 07:12 AM ---------- Previous post was at 07:08 AM ----------

If you've got one that ends in a flat end step to the hose, then you can improve it by extending a tube out a couple of inches from the flat plate, and improve it more by flaring it, and improve it most by fully rolling it.

[wallace]

I don't see why it wouldn't work. not sure about the gains I think that would depend on the application and how it is used. anything to ease the entry of airflow into the intake tract on a turbo application is going to increase performance as it should also increases the flow rate. The inlet of the compressor and outlet of the turbine needs all the help it can get.

[contraption22]

I don't see why it wouldn't work either. The K&N Xtream clamp on filters have a rounded tapered neck leading to their flange. Same concept as this.

[turbovanman²]

I agree on the concept but reduced lag? They showed a 20hp gain on one car, which unless it had the worst flowing air box in history, I can't see it.

[contraption22]

I agree on the concept but reduced lag? They showed a 20hp gain on one car, which unless it had the worst flowing air box in history, I can't see it.

Any resistance to the air entering the turbo is going to contribute to "lag".

[wallace]

Any resistance to the air entering the turbo is going to contribute to "lag".

For sure. The compressor inlet and turbine outlet need all the help they can get.

[turbovanman²]

Any resistance to the air entering the turbo is going to contribute to "lag".

Again, I agree but to pick up that kind of HP, he must have had a shitty airbox to being with.

I am surprised by you guys, usually you jump all over this stuff as crap, lol.

[shackwrrr]

I don't see why they market these as some magical new device. Its just a velocity stack nothing new here and fluid dynamics proves that they work.

[contraption22]

Again, I agree but to pick up that kind of HP, he must have had a shitty airbox to being with.

I am surprised by you guys, usually you jump all over this stuff as crap, lol.

I cannot dispute that it works. I also cannot dispute their big HP numbers, assuming, as you said, that the intake system was far from ideal to begin with.
I forget the MPH numbers that Brian Slowe's car picked up when he went from an open compressor inlet to his bumper mounted air-horn. It was significant... and that's with adding 4 feet of tubing to it!

[OmniLuvr]

maybe the filter they base line tested with was dirty...

[thedon809]

The intake box on 3.3/3.8 minivans has a velocity stack in it.

[turbovanman²]

I cannot dispute that it works. I also cannot dispute their big HP numbers, assuming, as you said, that the intake system was far from ideal to begin with.
I forget the MPH numbers that Brian Slowe's car picked up when he went from an open compressor inlet to his bumper mounted air-horn. It was significant... and that's with adding 4 feet of tubing to it!

I agree on that, changing to a 4" system on my van was night and day, it leaned out so bad I had to add a ton of fuel.

I don't see why they market these as some magical new device. Its just a velocity stack nothing new here and fluid dynamics proves that they work.

Because most have no clue so they can market it as new fangled technology,

[Rrider]

20 is a bit much. But it looks like a ~320hp M3 on that one which is right in that 5-7% they claim. I guess its possible from their filter/stack if like you guys said the stock airbox was horrible. Now somebody needs to post a tutorial on how to make one with $5 worth of home depot parts!

[Tbird232ci]

In a lot of our setups, where we run a 3" intake tube, then it necks down to 2" or so at the turbo, I can see this setup not being a whole lot of help. If we were to run this setup, and then smooth out all of the kinks and reductions in the intake, it will probably help much more significantly.

Once I figure out my plan for my turbo, and get the rest of my big item parts together, I may try one of these. The biggest problem in my opinion, is the expense. I remember years ago a company tried to market these, I just don't remember what happened to them.

[Rrider]

http://www.sonicelectronix.com/item_...FUdxQgodQgkAMw

---------- Post added at 04:50 PM ---------- Previous post was at 04:44 PM ----------

I'll split one with you Simon... comes to $6 each. :P

[turbovanman²]

http://www.sonicelectronix.com/item_...FUdxQgodQgkAMw

---------- Post added at 04:50 PM ---------- Previous post was at 04:44 PM ----------

I'll split one with you Simon... comes to $6 each. :P

I'd be all over that if I hadn't just bought new 4" air filters.

[RoadWarrior222]

Now somebody needs to post a tutorial on how to make one with $5 worth of home depot parts!

If you keep your eyes peeled at the dollar stores, you can definitely find trumpet shapes in vases, flowerpots, beakers etc.. a good metal one is some "bundt" tins, that you can find used at the sally ann etc.... another one to look out for for big hood or bumper intakes is some types of christmas tree holder, but you have to turn them upside down to see it.

---------- Post added at 06:43 PM ---------- Previous post was at 06:40 PM ----------

Ohhhh, there's been some donut making kits with likely looking tins in, for individual intakes probably as they're not large diameter, but you get 6 to a tin. Those should be hitting the discount stores soon.

---------- Post added at 06:47 PM ---------- Previous post was at 06:43 PM ----------

Oh anything that does a 90* but doesn't roll right back, you can probably improve by using a flexible cylinder fixed around it, such as pipe insulation or something (fine for airbox, but not plenum/intake)

[moparman76_69]