Notice on the bullhorn how it goes from 4.5 to 3 at top. The hole you saw that goes into the engine bay won't support much of anything wider than 3 inches unless you 'ovalize' the piece from a circle...and then you have to ovalize any connector you attach to it. Having this size, 3 inch, means the air will move along much quicker (and is equivalent to the intake piping up top) than the 4.5 inch where air has time to settle. My original idea with the 4.5 was to give a kind of quasi-air box at the bottom.

 

Notice the 3 inch diameter on the back of the bullhorn piece.

 

So why this design?

Originally I wanted the two pieces to join up top near the fusebox. Due to contraints in terms of what space I had to work with I came up with the compromise design.

The principle I am using revolves around the idea of how the engine pulls in air (a vacuum). There is suction effect due to the downward motion of the pistons. That is the reason, an OEM RX300 doesn't need air rammed in via bullhorn but literally sucks it up so to speak.

My bullhorn worked well with this principle, but not as well as I liked. You see as air was being pulled up, given my altitude, from a dead start and shortly thereafter, there was not enough air being replaced in this intake (only at higher speed or at lower elevation, where there is greater oxygen content), and I would have a lag. I have noticed this in the progression of my 60 foot times at the track going from 3.3s to 3.2s down to a record 2.694.

By using this dual system, one tube's air is being sucked up and right next to it in reserve is another one with available air, kind of like a boxer that strikes with one hand and then immediately follows up with the other (I will get to this at the end as there is a story behind how I thought of this). Not just one hand that has to fire, reload, then fire again.

 

Now it was time to install. First went the non-lateral piece.

 

Then the lateral piece was added.

 

A darkened view to show the light at the front.

 

A view underneath with the duct tape and plastc ties.

 

Toward the front with the same view.

 

And really not much of a bulge.

 

And now I have my double tubes.

The first idea in my mind about this design came while sitting with my father at a famous taco place here in Mexico City called Lago de Los Cisnes. It is open very late and is found in the Lomas de Chapultepec neighborhood near Paseo de Reforma and Periferico, near the Polanco neighborhood.

My father and I had just come back from Pista Tlalnepantla north of Mexico City (that is where all those videos/photos you see on youtube and my car domain page are taken at). My father had been hoping to see the Miguel Cotto vs. Zab Judah fight.

Guess what? Although it was PPV, TV Azteca was showing it on a very quick tape delay, and so my father was quite fortunate to be able to watch the fight. As I watched Cotto unload on Judah, left...right...left...right, I couldn't help but think of my intake system, two tubes. Earlier in the day in the parking lot of Costco in my neighborhood I had seen an old Mustang with two lower intakes on each side. Putting the two ideas together, I came up with a design and I later modified it to fit.

It is raining tonight so now track until tomorrow afternoon, but the engine seemed much louder and the engine was more responsive off a dead start. Didn't have that lag feeling as much at the start. So we'll see how it goes.

 

Nice design of doubling the air collector intake diameter. Now only if we can find ways to freeze the air coming in

 

Hmmm, maybe something I have to think about for another intake modification.

Actually, I still plan to modify more of the intake. I want to do a modification of that steel piece so that the offshoot part is better covered from the engine. Will involve changing piece to aluminum, cutting slits around the middle and then placing a small shield (thinking about a small cylindrical lamp cover/shade).

 

How about wrapping lower-pressure A/C pipes around (or coil inside) air intake? I don't know how to do this, just an idea.

 

That is a good idea. I'll keep that in mind.

 

that looks really cool lexmex. you should make kits for people to buy

where do you keep your airfilter or are you not using one at all? i couldnt really find it on your pics.

btw i tried to send you a message on cardomain, but your page looks like it cant receive messages.