[killerbee]

I developed a great CAI, and it reduces max IAT from 220 to 150 when towing. The fan (for those of you who still live with it) is the cause of the 160. This heatup is responsible for a great deal of our cooling system shortage.

the simplified overheat mechanism.The IAT rises with fan engagement, hence the turbo outputs hotter faster charge, hence the CAC becomes hotter, hence keeping the fan on, never letting it shut off:

I want max IAT reduced to ambient plus 20. That takes the induction system out of the dead end thermal spiral.

So the idea is to provide a pressurized source of ambient air to displace the fan air that is migrating into the fender.

A multlouvered scoop that surface mounts for aesthetics, to be painted the vehicle color or carbon fiber. I hope that 600 SCFM at 60 mph, and 2 inches water column ram pressure will suffice. The louvers will direct any water to the area behind the intake, so element loading will bo a non-issue

 

[colnago]

KB,

Is this something you are actively working on right now? Any time frame for prototypes or production units (assuming you're moving in that direction)?

Joseph

 

[killerbee]

Hi Joe

Yes I am talking with a company to produce a variation of what is in the pic. I made a choice to also move it back on the fender about 6", a choice that baffles the intake from direct contact with rain.

It may interest a few of the more informed, those that have followed my effort from 2 years ago: I set up a test that actuates the fan with no substantial load. It consisted of a tune I built that has a ridiculous amount of boost with very little fuel. In 2nd or 3rd gear running 2800 rpm, 25 psi will trigger the clutch easily. Once the fan comes on, you can watch the IAT airbox temps increase readily. All this testing was done with my CAI, sealed to the fender. This intake change has reduced IAT peaks from around 220 or so, to around 150, a large improvement. But I really want the IAT truly decoupled from the fan, the only way to completely eliminate the feedback loop.

I tried a few things to play around with this phenom, and hands down the best way I found to keep that fan air out of the intake, was to run without the headlight. With the headlight in place, IAT would rocket from 111 to 140. With the headlight removed, it stayed under 115. It was my conclusion that ram air was displacing the hot fan air right in front of the airbox. So going forward, it is my objective to block the small openings in the fender, behind the headlight, and use this scoop to source lo temp air at low pressure to keep the fender air always charged at low temperature.

I will probably be looking for testers, if interested. I suspect a nominal charge for the piece once it is proto'd testing, around $40, at cost or below. You need a way to monitor IAT naturally.

 

[colnago]

Okay, so this gets cold ram air into the fender itself. It does not directly connect to the air box, correct? It probably doesn't need to, since (as you stated) it's preventing the hot air from the engine compartment from entering the fender area.

Cool.

Joseph

 

[killerbee]

almost correct. Yes, the scoop does not connect directly to the intake, and this is intentional, a baffle is needed to prevent water ingestion. That baffle is the dead fender air space.

I have already fixed 2/3rd of the IAT problem with the new intake.
To fix the other third requires the new scoop (looks like a vent, but technically it is a surface mounted scoop with properties similar to a NACA), AND sealing off the openings at the front in the fender. The scoop alone might be enough, however I won't know till it's tried.

 

[Thunderhead7]

I'll be watching this thread!! Great work Mike!

 

[Diesel Tech]

KB

You might want to look at the intake that Volant already sells. They made a sealed box that draws air from the front bumber area. The IAT stays within +10 deg of ambient.

 

[killerbee]

The one I tested draws from the fender and under bumper. It did not stay within 10 for me.

But I do agree it is probably the best aftermarket intake around, if you can afford it. But I cannot say that its filtration is good or bad, but I suspect if it takes after most, it is not good.

 

[killerbee]

prototypes

 

[colnago]

Are these prototypes that you can begin testing with?

Joseph

 

[killerbee]

they turned out too big, so they won't get used.

when I get useable ones, are you interested Joe?

 

[firedoger]

KB have you noticed that alot of the new GM vehicles have a vent or a scoop on the fenders? I wonder why?

 

[killerbee]

no, I haven't. Do you have a pic? I have seen medium duty type trucks with pull type vents, IIRC.

I wonder how long it will take for this project to be plagiarized also?

 

[firedoger]

I have been seeing them more and more since your idea started. I'm not sure if it's just a vent or scoop. They must have realized the amount of heated air that is trapped under the hood.

 

[killerbee]

for clarification, this does nothing for underhood heat. In fact, by intention. The idea here is use a cold air intake that source fender air, then make sure there is cold air in the fender. It's not an extraction vent, it is a positive pressure scoop that is flush.

The main problem I am trying to fix, is that the fender air will come from the fan when it starts roaring, and IAT heats up. And ALL cold air strategies I have seen suffer this, even mine. If you displace that fan induced migration with another source (scoop) then problem solved. hopefully

If there was an extraction vent placed there, I am certain it would make the IAT condition worse. Most extraction vents I have seen run at the back and down low on the fender. On the inside of the fender, there is a free and clear path to pull from the motor bay area. That does assist underhood temps.

 

[colnago]

they turned out too big, so they won't get used.

when I get useable ones, are you interested Joe?

I find the idea quite fascinating. I think the intake temps would benefit quite a bit from having a fresh source of air, and this could only help things. From their physical appearance, it looks like the new Fords might be doing something similar (although their opening seems to be the rear of the fender, so maybe this is a way for hot temps to leave the engine compartment?). In fact, doesn't GM do this on the 4500?

Some people have tried making ram air scoops by using shop vac hoses to guide air into the bottom of their air intake boxes. Have you done any experimenting with this approach, for getting fresh air into the system? Do you know if others have had much success doing this?

Thanks,

Joseph

 

[killerbee]

(although their opening seems to be the rear of the fender, so maybe this is a way for hot temps to leave the engine compartment?). In fact, doesn't GM do this on the 4500?

I believe that is the case, yes.

I am not a big believer in sourcing low to the ground, here in flash flood land, i need my truck running. The turbo has plenty of suction abilty to pull the puddle up. To me that is basically giving that expensive motor a straw to expedite kool aid suicide.

Some people have sourced the fender as well as down low in parallel. That is fine, but the fender still heats up.

If there is an oem application to pressurize the fender (I like the way that sounds) I am not aware of it.

 

[Thunderhead7]

The new Escalades have vents on both sides, I don't know the functionality of these, but they look good.

 

[LarryJewell]

Fender Scoop by Killerbee being installed today, I'll post pics tonite.

 

[LarryJewell]

fender scoop installed

Just got the fender scoop added for more cold air, also added the Volant Intake "wrapped the tube in header wrap", sealed off the inner fender to keep hot engine compartment air out of the intake and will be adding the Volant Lower intake scoop as soon as the UPS guy brings it. I dogged it fairly hard at lunch today in stop and go traffic and I couldn't get the Big fan to come on, So I they this was a worthwhile mod. IAT's are way down, averaging less than 10 degrees above outside temperature on the highway and only 20 - 25 deg. above outside temp in heavy stop and go traffic.

While the fender scoop is cut into the fender, only the outer surface was removed, there is still middle section still intact which vents downward and has several smallis holes in the middle areas. The scoop is moved back far enough that I hope not to suck in water when it rains, it looks to be protected. I'll find out later in the week, "rain is coming".

My understanding is that with the inner sections sealed off, and I used reflective dynomat to do this, a pressurized cold air source has been created.
The last photo kinda shows how the interior should be protected from rain.

Ups guy just dropped off the lower scoop, that will go on tonite.