TheChunkNorris

Pretty sure you can get a dry one too. The other option would be a Gruppe M or the FSI.

Porschetech3

That sure is pretty, but Carbon Fiber will conduct more heat from the hot air inside the engine compartment to the air inside the box than PA66 ( Nylon 66)..

Carbon Fiber conductivity 5-8 W/m*K
PA66 ( Nylon 66) conductivity .200-.260 W/m*K

This means at low speeds under 40mph or at idle in traffic, the Carbon Fiber one will show a hotter IAT than a PA66 one...

You can easily check your IAT's with a simple $20 dongle ( ELM327) and a free app for you phone..

EVOMMM

I still like mine better
even 2 years on and 6k miles
for $500 im good but the rennline box is pretty

Porschetech3

You would be surprised at how fast one like that will cool off the IAT's once you get above 40mph, the factory box takes longer to cool off. There is a lot of ambient air going down into that area at road speeds directly on the air filter..

Yes yours looks good too !! The Rennline reminds me of a "K&N that is enclosed, made from Carbon Fibre" because of the snake like look to the tube..but it is purdy..

philbert996

I applaud any company that is developing products for the 996.
Rennline has put out some really great looking carbon fiber stuff recently.

damage98MO

Skip, I used to have a Remington Nylon 66 .22 cal. Great gun, super light with a very smooth action.

Porschetech3

Yep, Nylon 66 ( Polyamide 66/PA 66 ) is very light weight/ very thermal resistant, strong ( especially when filled with glass), and inexpensive...and is used extensively in Automotive underhood items.

Carbon Fiber is extremely strong, light weight, very beautiful, but is not as thermally resistant, and is expensive..

I have a Savage .22 Auto in Nylon 66 . sweet little fun gun..

TheChunkNorris

Where are you getting the 40mph number from? The reason why I ask is the FSI airbox is also all carbon and they actually do R&D and heat transfer seems like a gross oversight by alot of people/engineers.

Porschetech3

The articulating spoiler used on the non-aero cars lowers at about 40mph. This decreases the air flow into the engine compartment greatly.. This is also one of the reasons I fixed mine to be extended at all times , besides I like the looks of it extended over the silhouette of it lowered...Just a personal preference..

I have had my car for 15 years and always leave my OBDLink dongle plugged so I can have all the OBD2 data displayed on my phone when driving so I can monitor all the data.

I have watched the time it takes for the IAT'S to go up at idle when at a red light and how long it takes to cool off after getting up to speed with both the factory air box and an open air box like the one shown above..

You can do this too for about $20 ....

TheChunkNorris

I see. Let me ask you, isn’t it conceivable for carbon to cool as quickly as it heats? Your calculation is based on a nylon box or the one of your creation you posted a while back. In the case of my particular car it’s a non factor because it currently has a ducktail and vented.

Porschetech3

Well, the thing about heat transfer is that the heat always finds a way to go to a cooler area, but the cooler area never goes to a hotter area, it just heats up or finds a way to go to an even colder area..

That said, I love Carbon Fiber as much as the next guy, I'm just stating what I know...

EVOMMM

F the nay sayers
I like it and don’t race it
aesthetics inside engine areas are as important to me as the outside

brontosaurus

the tl;dr from what I would eyeball from my mass transfer courses from forever ago would basically be that anything in that engine bay is eventually going to heatsoak to some steady state and it's really not going to matter to the final IAT much, esp at WOT.

What people should actually care about is the pressure drop end to end, how the filtering media compares to the huge panel that's in the OEM box, and probably most importantly, the overall length of the induction tract. This is a nice looking piece but I suspect there won't be much gain to be had here.

Porschetech3

IAT's will vary from about 140F down to ambient temp.in a normal drive ..Ambient temp or 1-2* above when at speeds and about 140F stilling at a traffic light..( in Bama)

The difference is how long it takes to reach these high/low values between an open filter like the one EVOMM has, and an enclosed one like the Factory one..

You don't have to take my word for it, it is so easy to see for your self...

brontosaurus

Point is, conductivity doesn't matter much when the overall mass is little and is heatsoaked easily, along with minimal surface area compared to what is flowing inside of it.