Gernby

iTrader: (1)

I meant to say that I think the extra hole is all about sound since I think that the solid intake pipe (JoeZ style) will help some.

Buds

Ohhhh. Gotcha.

javyLSU

iTrader: (21)

I got news for everyone: The stock intake pulls engine bay air too. Take a minute and lower your hood, almost to the point to where it's shut. You'll notice that the hood when closed, sits directly in front of the intake duct. The air is pulled in through the holes in the front engine cover, which if you follow the path, means that (drum roll please.......) the intake air passes right by the radiator first. It surprises me that no one has realized this yet. The design of the stock airbox is definitely superior to that of an open box "hot-air intake," but I don't think we should revere the stock intake as if it were true cold air. As a matter of fact, I did some everyday street driving testing comparing the K&N with the stock intake. I had an OBDII sensor feeding me intake air temperature as measured by the MAF, and interestingly enough the heat soak when stopped in heavy traffic was actually worse with the stock intake than it was with the K&N.

Javier

Gernby

iTrader: (1)

There isn't anything bad about drawing air from in front of the radiator. SRI's are pulling air that has passed through the radiator.

That said, your point about monitoring IAT via OBDII is surprising. I might have to hook mine up...

javyLSU

iTrader: (21)

True - but at a stop, where there is no wind, the stock setup is drawing air from above the radiator, which probably explains the heat soak issue since this is exactly where the heat would escape. The radiator's sole function is to dissipate heat, and I wish Lexus had designed the the stock air duct so it wasn't so close to the radiator as it is. I drove around with that OBDII sensor for almost two months, swapping intakes back and forth, and the pattern was consistent. (Thanks to CL member cliffud for letting me use the sensor!)

Javier

Joe Z

iTrader: (10)

^^^
Hey Javier...
Did you ever notice the two sets of rubber gaskets???
There is one thats sits above the scoop opening that blocks off engine air, when the hood is closed all the way.

The AIR FLOW actually comes from behind the OEM Grill and then straight up the vented area that sets just below the air scoop...
Take a look...




^^ Sorry buddy.. No website... Just an avid Enthusiast...

Welcome to Club Lexus!!

Just a quick FYI again for new and old members... I would never R&D, make & sell a product if it didn't truly have any power gains...
My Dyno testing was consistent and independently completed each time..

Also, I am very glad when members like "caymandive" purchase the Intake, paid for his own dyno testing and got the same/better results... 3,000 miles away from CA...

Great work James & Thank You!!



Joe Z

Frisco

Joe, Cayman

Do you think there would be any benefit to opening up the small holes in that panel in front of the radiator? It seems all the air has to come though the grated holes and where the hood latch goes through. It's sealed with the rubber gasket all the way around it.

Gernby

iTrader: (1)

Toyota engineers would have to be totally unqualified to have messed up that calculation.

javyLSU

iTrader: (21)

That's exactly what I was referring to Joe. The air flow comes from the area directly immediately in front of the radiator, behind the grille. When stopped, heat soak is directly attributable to the intake scoops's proximity to the radiator.

Javier

Gernby

iTrader: (1)

The term "heat soak" isn't really applicable to the temperature of the air when it enters the intake. Heat soak refers to the heating of the intake air AFTER it has entered the intake as it flows through the intake pipe, throttle body, intake manifold, and head. Heat soak is particularly bad when in stop and go traffic, or between runs at a competitive event because the heat from the engine will "soak" into the other components due to reduced coolant flow and reduced air flow. The heat soak will go away after a few miles of driving at speed.

javyLSU

iTrader: (21)

That's a good point Greg. IAT would have been a better term to use.

Javier

Joe Z

iTrader: (10)

Yes very good point...

I would say, it goes away after a few seconds of driving..
(only directly related to the "soaking" in the air intake system, if any..)

How you guys ever felt the suction power / air speed inside the air intake pipe or Throttle body??

It can litterally suck your arm up on open throttle...

Joe Z

iTrader: (10)

I see what your saying, but there isn't much you can do when standing still...

Personally I have felt air flowing in through the front of my grill, when parked and hood closed..

Joe Z

Gernby

iTrader: (1)

I agree that IAT will drop a whole lot in a couple seconds of WOT, but it takes a lot longer for true heat soak to "go away". It takes quite a bit of air to cool down the whole intake system once it's been fully heat soaked. Well, I guess it won't take as long on our cars as it does on many others that have huge cast iron or aluminum intake manifolds.

My S2000 had all the cooling mods (cold thermostat, high pressure radiator cap, colder radiator fan switch, diluted coolant with Water Wetter, insulated AEM CAI, and insulating intake manifold gasket), but it still took about a minute at WOT for IAT to drop all the way down to ambient.