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Discussion Starter · #1 · (Edited)
First of all, shout out to @smc4C for his write up and @Keiji Takahashi for the inspiration that gave me the motivation to do this for my car. I decided to do the DIY install @smc4C posted except with the ADDW1 catch cans using the location that @Keiji Takahashi used to mount them.

I decided to do a little extra work and design a bracket to use the same location those guys but that would make install easier as well as get the can inlets and outlets higher. (more on that below)

Once I sorted out the catch can bracket design to get it perfect I was off to the races. This was a really simple install once I had the plug and play bracket for the coupe. I didn't need any heat, or lube, or any other tricks to put the hoses on either like I thought I might which was an added bonus and sped up install.

Update Below:

@John4C reached out to let me know that the area that the bracket mounts in the coupe is the same in the spider. The reason I thought there was a difference is because I thought the spider guys were using two factory threaded spots like the bracket does. The other issue I ran into with keeping them mounted at that height (without the bracket) was that I could not unscrew each catch can to service them like I wanted in order to make it turn key. The third reason I ended up making the bracket is that the bracket makes install of the cans incredibly easy and straight forward as you do almost all assembly outside the car where you have all the space and dexterity you need to properly assemble and align the parts. This is the best part of the bracket as I tried installing the cans in the location without the bracket before making this. It was incredibly tedious and next to impossible to get it all lined up how I wanted.

One other thing to note is the bracket makes the inlets and outlets of the can in between the height of the PCV and the intake manifold which is great because it keeps things moving downhill. Without the height of the bracket you would most likely be mounting the inlet and outlet of the catch can below the intake manifold which would put it at risk for oil filling up the catch can.


Here are some pics of the bracket and install.

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The bracket: I know what you are thinking. How did it take a few revisions to come up with that??


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The bracket was designed specifically for the ADDW1 cans but from what I have seen you could attach any universal can to it.

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Tucked in the corner neatly out of the way but still very easy to unscrew the bottom and check for oil.

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This is how I routed the hoses to try and keep the radii from being too small and to use existing hardware to shape the routes.

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Beau's cover doesn't impede the ability to do this mod at all.
 

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how much blow by does our cars get to need a catch can?
Without port injection, the intake, particularly the valves, are never getting cleaned by fuel, and the entire system is set up to recirculate exhaust byproducts into the intake. There is enough oil, in even the best DI engine, that byproducts eventually foul the intake. Performance will slowly degrade over time. It's almost a guarantee, so we're past the point where anyone needs to measure it or prove it. The VW group and BMW, since they produced millions of DI engines virtually identical to ours, are the providers of all the evidence, prevention and repair options we need.

So, exhaust gases have oil in them and they're going back into the intake, which is unwashed (catch can helps) and the oil is getting diluted by fuel (solved by doing oil changes twice as often, because oil change intervals are carryovers from pre-DI era)
 

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Thank you for posting - that is a nice bracket you fabricated!

As it so happens, I also did an install a couple weeks ago on my coupe. I was able to fit the SpeedWow cans (SPEEDWOW Oil Catch Can Tank... https://www.amazon.com/dp/B086H9SSG1?ref=ppx_pop_mob_ap_share). These cans do fit without any bracket nor modification to the car. Just had to get the right length bolts and washer stack similar to @Keiji Takahashi (buy extra washers to shim the bolts to the right length. I also was able to install with no heat nor lube.

Here’s a pic for anyone who is thinking of doing this (highly recommend). As @thatarchitect says, it’s a straightforward install.
 

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Discussion Starter · #10 ·
View attachment 130492
Thank you for posting - that is a nice bracket you fabricated!

As it so happens, I also did an install a couple weeks ago on my coupe. I was able to fit the SpeedWow cans (SPEEDWOW Oil Catch Can Tank... https://www.amazon.com/dp/B086H9SSG1?ref=ppx_pop_mob_ap_share). These cans do fit without any bracket nor modification to the car. Just had to get the right length bolts and washer stack similar to @Keiji Takahashi (buy extra washers to shim the bolts to the right length. I also was able to install with no heat nor lube.

Here’s a pic for anyone who is thinking of doing this (highly recommend). As @thatarchitect says, it’s a straightforward install.
Nice! Were you able to mount to 2 spots that were threaded on the car or did you use a nut to hold one in place? Unless I missed one, the two on my car were too close together for the diameter of the cans.

Can you unscrew the bottom of the can all the way off while in the car? I had to raise mine but it looks like the Amazon cans maybe are not as tall.
 

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Discussion Starter · #12 ·
@thatarchitect
Can you share your template dimensions please?
I am going to have a short run made based on interest in the bracket. I will need to sort out cost based on total interest but if anyone would like one they can PM me. I am working on a few other parts people might like for their 4C in the future as well.
 

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Nice! Were you able to mount to 2 spots that were threaded on the car or did you use a nut to hold one in place? Unless I missed one, the two on my car were too close together for the diameter of the cans.

Can you unscrew the bottom of the can all the way off while in the car? I had to raise mine but it looks like the Amazon cans maybe are not as tall.
yep, the two holes that were open were too close to one another. I used a longer bolt with a couple washers to replace the body bolt that was there, and then held the one can with a nut on that bolt. For the other can, the bolt I added just held the can.

yes I can unscrew my cans while in position. Probably they are a tad shorter than yours?
 

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So there is GMS that offers one system and a bunch of different cans one can piece together from Amazon and mount, but save a bunch of money. Are they all the same? Any reason to choose one over the other?
 

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So there is GMS that offers one system and a bunch of different cans one can piece together from Amazon and mount, but save a bunch of money. Are they all the same? Any reason to choose one over the other?
There are different quality cans (whether or not it matters idk). The cans @thatarchitect used are very high quality. I’m not sure what cans GMS uses but I seriously doubt they’re nicer than the ADDW1 ones. Personally, I am going to replicate @thatarchitect ’s system. He sent me his shopping cart and it was about 250 today when I duplicated it. I am hoping for a 4th of July sale to maybe get it a little less.
 
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Discussion Starter · #16 ·
yep, the two holes that were open were too close to one another. I used a longer bolt with a couple washers to replace the body bolt that was there, and then held the one can with a nut on that bolt. For the other can, the bolt I added just held the can.

yes I can unscrew my cans while in position. Probably they are a tad shorter than yours?
I didn't have an existing body bolt in that location. This is how it looked before I installed the bracket. (below)

I bet the height difference in the cans was just the amount I needed to raise mine to get good clearance for servicing.

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Discussion Starter · #17 ·
So there is GMS that offers one system and a bunch of different cans one can piece together from Amazon and mount, but save a bunch of money. Are they all the same? Any reason to choose one over the other?
There are lots of universal catch cans out there along with the GMS kit. I am not an expert on catch cans but I just personally chose to go with a brand for something like this application that was functional and involved the engine. I have no idea if the cans I chose are better than the ones from China on Amazon or not. It was purely just a choice I made for myself to go with ADDW1 after a lot of looking around.

When GMS announced their kit I thought that would be the way I went but when I saw the price I slowed down on it. Once I saw it installed in person I was 100% decided I didn't want that. I do not like the location it is installed or the look of it in the car.
 

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Once I saw it installed in person I was 100% decided I didn't want that. I do not like the location it is installed or the look of it in the car.
Initially I was looking at placing the OCC at the exact same spot you're using, but there were two issues with it. First and the main concern was that the OCC is too close to the tire well for my piece of my mind. In case of oil leak, which can happen, the oil could be getting on to the tire / under the tire, especially when cornering which can get dangerous. As we are selling this item publicly / officially, it's something we absolutely cannot afford to happen, due to safety concerns.

Second issue which is not so critical from my point of view, but not optimal either is the height of the OCC. Ideally OCC should be higher than the PCV oil separator. This way the condensed oil will flow back into the engine, while clean air will still get into the intake, which is the main purpose of the OCC. If the OCC is lower than the PCV oil separator, the condensed oil won't flow back into the engine but into the OCC. So instead of just filtering the oily air and sending the oil back to the engine where it belongs, you'll be filling the OCC's now at much faster rate.

Other than that, an OCC is a relative simple device, so you can't go much wrong whichever OCC brand you choose. The only reason why the new DFI engine equipped cars don't come with them from the factory is the environmental rules - car is not allowed to provide any external waste. However, there is not a single reason not to have one on a DFI engine if you care about your car's engine and potential carbon buildup at later stages.
 
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