Well lookey that there, a Honda L15BG Thailand FFV motor -- with a heat shield beneath the intake crossover. From this very site. Great minds worked alike at one point in time:

Many visible differences otherwise, to my Honda L15BG motor. Same idea for the floating heat shield as additional to the shields bolted 'round the turbocharger itself, though.

 

No joy on a fuel economy improvement with this set of mods. It appears that any improvement in the reading was the measurement catching up to the reset at the beginning of the tank . That is not to diminish the greatly improved power and throttle response.

 

I've heard if you delete the noise attention box on top of the motor as well charge temps drop. My last vehicle I had a device embedded so I could see obd info on the dash screen. I too modded and changed the stock "hot air" intake and made it draw outside air only. Got it to drop 30-50F in some cases. I did it thru a string of 95-100f days and I went from 40-50 over ambient to just above ambient. But the problem ibran into was I could see HP and TQ demand numbers. Even the rig felt like it was struggling a bit more.

I eventually went to an aftermarket setup with a closed box that had a K&N barrel filter and they extended the intake like you did to get it closer to hood edge. And the temps stayed down and the struggling went away. Come to find out I had inadvertently with the stock box choked the airndown below necessary limits at higher rpm.

Why I looked at the 1.5s open inlet and went wow better design but again it's a hot air intake. I understand the reason to increase cold temp charge temps to prevent intercooler icing but in the summer it would be nice to have a bypass flap setup to only pull outside air in unless it's below X temp.

If you had a mate with a 3D printer y9uncould make your design intergrated into the lid of the filter so it looked factory, and should you get a period of below freezing a quick swap is all that is needed.


Thanks for the water ingesting clear up, good to know the box is designed to seperate it. If I ran y9ur design in my parts it would suck in plenty of rain water.

But again I'd delete the top box or put some heat shielding under it to see if it drops charge temp more. I bought a Ultra Gauge to see Charge temps, boost etc but sadly the Honda uses a complex protocol to decode that most generc scanners lack. My Honda specific code reader actually shows everything I want to see but not designed to stay plugged in outside of diagnosis.

All and all great design. Lower charge temps are definitely better andofe beneficial. I'd love to see your petrol consumption increase after it settles in and remaps the ecu to compensate.

 

Clever approach, but I am not sure if you are fixing an actual issue in design, or simply expressing your creativity.

I personally would not make this modification as I have no idea what the long term repercussions might be for the engine in general. Plus, depending on the state you live in, this might blow a vehicle inspection if it includes any engine modifications that alter engine parameters in any way.

One thing about Honda engineers, they are fastidious about engine designs, tuning, and most of all reliability. They always leave margin on the table in favor of dependability and reliability. So I find it hard to second guess them on anything engine design related. Body panels and cabin interior though .... I would second guess them on some elements on some CRV generations.

 

Clever approach, but I am not sure if you are fixing an actual issue in design, or simply expressing your creativity.

I personally would not make this modification as I have no idea what the long term repercussions might be for the engine in general. Plus, depending on the state you live in, this might blow a vehicle inspection if it includes any engine modifications that alter engine parameters in any way.

One thing about Honda engineers, they are fastidious about engine designs, tuning, and most of all reliability. They always leave margin on the table in favor of dependability and reliability. So I find it hard to second guess them on anything engine design related. Body panels and cabin interior though .... I would second guess them on some elements on some CRV generations.

Of course your viewpoint is valid to me.

Lowering the intake charge temperature is a standard ideal for turbocharged cars (I've been playing with them and driving them since the 1970s and so before intercoolers and fuel injection) and there are NO changes to the engine or its computer at all.

The temperature of the charge air fell 60 degrees C! And as a reward for my 'whimsy', the car cruises on the freeway (up to 110 kph) at near idle vacuum (15 in/Hg vs 7 in/Hg) and on flat ground, as high as 20 in/Hg.

Fuel economy was steadily improving on a single tank to 8.5; as soon as I removed the setup my fuel economy began to drop and is at 9.0 presently and rising (it's how economy is measured here, the reverse of how it's done USA).

Even the wife has noticed the fresh 'spark' in the car's acceleration! And we all know that to impress one's wife with one's tinkering is unheard of .

Will I put it all back on? Dunno, though I did like the Mercedes-like responsiveness and smoothness. But with a new car warranty I would hate for the dealer to take your attitude so the setup may stay off anyway.

As for Honda engineers knowing better than I, who could argue -- except to say that they design for many countries but I didn't have to. My addition of the snorkel was in view of having none of the airborn contaminants like Fall leaves or locust swarms or sand storms to consider. Mighty clean air quality in Queensland! In removing my setup I also removed my K&N air filter and reinstalled the factor paper one. Despite the direct flow of air from the bonnet into the snorkel, the air box and filter surface on the underside of the K&N was completely clean! Honda designed its 'upside down' airbox to capture water, for example, and has a large holding tank for that: and the water is too heavy to rise up through the filter even under vacuum.

That's a win/win/win except for warranty concerns. And no passersby to impress: it's all completely concealed under the bonnet. No external clues to the mods.

 

Apologies for my possible ignorance, but won't it result in overheating the turbocharger? Technically hot air moves upwards and this shield may just lock it around the turbocharger.

 

Great idea. Would you mind giving me the dimensions so i can make one'?
did you use a break for the bending?

 

Sure. Bear in mind that most of this is arbitrary, including the material I used 'just because I have it'. An ordinary sheet metal of steel or aluminium w/b OK too; mine is 'silvered' on one side because I bought a batch of strips at 6" wide to use with my rooftop solar system. What that does or doesn't do, facing downwards towards the turbocharger, I can only guess at.

Mounting: note I've attached it with two bent angles. If I had it to do again I'd instead use stiff brackets to the two existing screws at the cylinder head cover, and airbox mount.

That it's bent along each long side is so that it will slide under the intake pipe at the 6" width I am using. You can make your own choices. I've removed all my improvements to see if I've been imagining a driveability improvement. Will post up my humble opinion on that.

 

i can't view the pics. It shows them as a link which goes to nothing. Can anyone else see them?

 

Yes, works fine for me. No link, they show as thumbnails that can be enlarged.