Jean

What a nice car and build! The GT35 should be a real blast

I would maybe reconsider placing the air intake in the rear fender inside the wheel wells. That is a low pressure area and very little air goes through it, air passes by the side of the body, across the rear wheels, and then straight to the rear bumper, especially in wide body cars, there is little or almost no air flow coming inside the wheel wells while dirving.

One should look into the GT2 Evo setups and try to simulate them by routing a duct from a high speed fresh-air location such as the top of the rear engine deck lid, where fresh air flow is massive, coming from the rooftop towards the top of the wing tail, where the intercooler is located. A scoop there, (think GT3 Cup) and ducting all the way down to the turbo seems like a better option despite the distance travelled.

Just my 0.02c.

911rudy

Another option is to add the rear brake vents like you see on my car. I noticed when I put them in that with some custom made ducting running along the inside of the wheel well, that it could be routed into the engine bay very easily. It would be pressurised air while moving and would be a lot cleaner. If the old style vents were not wanted the new style, half moon, which are drop in vents could be used.

jimculp

I'll just use a chisel and hammer to get this effect

PorschePhD

LOL, the S ducts would be cool. We have done this before which worked out well.

911rudy

I believe the boxster has rimmed intakes that fit into the fender through a hole that is not lipped. These would be much easier than the old 930 S type.

bogey1

I always LOVED the S rear panels.

jimculp: are those factory or aftermarket?

PorschePhD

Don't get any ideas .Phil!

JBH

I absolutely agree - this seems risky. The K&N filter is not the best for filtering small particles and dust. I bet after a few weeks, there is considerable buildup of dirt on the filter. I would also do an oil analysis looking for silicon and aluminum indicative of mineral matter.

PorschePhD

Jeffrey,
You can actually get a sock for the filter that is an additional filter to help with the particles usually missed by just the normal K&N. It is also useful on the newer TTs that have MAF issues in regards to the oil and the film on the maf.

All things considered when you have a 4 inch pipe going to the turbo your options are VERY limited.

JBH

Stephen:
I can't put my hands on the photos, but I remember seeing the air inlet/filter routed back up into the engine bay. Was there no room, the plumbing too complicated or something unusual about this conversion?

Edit: I found this photo...

PorschePhD

Part of it was space. We would have to cut about a 5 inch hole in the side of the engine bay in order to accommodate a 4 inch holes. Reroute the engine harness and the fuse panel, etc. It when it came down to doing it the space was questionable and I didn't want to cut half of the bay to rig something that wouldn't work. We considered stepping the pipe down but I didn't want to restrict the turbo inlet.

I have done smaller pipes like 3 inch that way but another inch makes it a bit more challenging.

PorschePhD

Snowmobiles!! What the hell does snowmobiles and this project have in common you are asking. Glad you asked Well apparently snowmobiles have an issue of melted snow water locking motors! AKA water! So they developed a screen that will resist water but still allows flow for the intake to come through. So we ordered some and will be placing it around the area of the filter. This should keep any large amounts of water out of the filter area yet allow good flow to the filter.

As soon as we get it I will post pics. And to think I hate the snow!

PorscheDoc

You love snow!

PorschePhD

Yep, that is about a 3 inch pipe though not the 4 inch we have coming off of the turbo now. There is not that much metal on the tray! I do think the new solution will work well. All the snowmobile forums talk about the screen. I guess it is a silicone based screen that is also used in pet doors???

Uh huh Karl love the snow. That cloud in front of me is not my breath. It is me cursing as my hands went numb!

dholling13

Would this also be a necessary add on item for the BMC Filter kits?