MATTPEREZ39

Hey everyone. I first want to apologize if I am adding another thread to this forum that may have already been covered. I was having trouble finding what I was looking for.
I have a 2015 c300 and I have an exhaust cutout on the way to try out. I was wondering if anyone had any knowledge of the vacuum lines or a diagram that would help me determine where to tap into.
Thank you in advance!

dagger22

The easier way is to tee into the nipple (circled in green), the harder method is to buy a boost tap/adaptor to fit into the pressure sensor (circled in red).

MATTPEREZ39

Thanks so much for the reply man, I appreciate it! Do you have any insight into tapping into power from the front cigar lighter? Mostly wondering which color wire I need to tap to power my valve switch

dagger22

you should look at your fuse box and find the one for switched power.

https://knigaproavto.ru/shemy/en/mer...e-diagram.html

MATTPEREZ39

The kit that I am receiving today has the tap included I think, something that looks similar to the attached image. In this case I will not need to mess with any fuse right?

W205PR

Sorry this question but why tap a vacum line for a exhaust cut out? Is that cut out work by vacum to activate?

diamondsilver16

Yes. The divertor that directs exhaust flow is a vacuum actuated unit.

MATTPEREZ39

hey dagger sorry to call you back to an old post.. I was wondering if I need to tap into the bottom nipple that is more in the circle of the photo you posted to me or if I can tap into the one slightly up and to the left of it as it is much easier to tap

dagger22

not sure which other location you are referring to though... is it the one before the throttle body?

MATTPEREZ39

Just the other nipple that is like an inch up and to the left of the one circled in green, the green line of the circle is going through the nipple I am referring to. Only because I think I would have a much easier time accessing the vacuum line coming from that nipple

MATTPEREZ39

wanted to insert a picture to clarify which nipple I am referring to. I added a red arrow pointing to it. The tubing coming out of that nipple that the red arrow points to seems to be a harder pipe like tubing rather than softer hose. I am not sure how easy it is going to be for me to tap into it based on how sturdy it felt, but the one underneath which you have circled in green seem so difficult to get to. I'm not sure what to do to be honest.. =\

dagger22

ah, I got it. the one that you pointed to only takes a vacuum feed, not sure if there is a check valve built in. the one i circled reads both vacuum and pressure.

MATTPEREZ39

since I am just trying to get a source of vacuum to activate the flap when I flip my switch inside would that work for me? If I was installing a boost gauge I would for sure want to tap into the bottom one I imagine. I hate to ask so many basic question but I can't seem to find a lot about the w205 c300 with the c43 and c63 turning up in a lot of the searches I have tried given the enthusiasm around them more so than a c300.

MATTPEREZ39

Hey again dagger, I have been doing some research and it would seem that a lot of people who need to tap into their intake manifold do so by actually drilling or punching a hole in their intake manifold to add a port. Most people who do this do so because their intake manifold doesnt have an extra port or they cannot access tubing easily enough to T tap into one (this is the case for me, too tight of a space and taking the part off would seemingly take lot of work) So let me know what you think about my idea of carefully drilling a small hole in my intake manifold where I put the red X and screwing a brass nipple into that with a small amount of epoxy on it to keep it sealed and secure.

dagger22

yes that is definitely possible and easy to do.

MATTPEREZ39

I think that will be my approach. I'm gonna use a wood bore tip to slowly shave off the the majority of the way through and then from there I think I will heat a thin blade to cut around the diameter of the hole and hopefully remove it as one piece. I have also heard of some people using a lubed or greased bit while slowly drilling to allow the shavings to stick to the lube or grease when drilling aluminum intakes. I think the same thing would work for me. I'm not sure which to do. Any suggestions? by the way, I really appreciate your guidance thus far

dagger22

i’d recommend removing the screws holding the intercooler (i think its 3 or 4) and move it forward, then remove the throttlebody.

you should be able to stuff a rag in to prevent any possible shavings/debris into the intake tract.

i still believe in doing it once and doing it good. If some plastic shavings drop into the intake, it may not pose any issues (fingers crossed).... but just the thought of it, i’d just try ways to prevent it from even happening.

MATTPEREZ39

that is a good idea. I would imagine it will only add about 20 minutes onto the job and I much prefer to do a job once and to do it correctly as well haha

MATTPEREZ39

I just went out to look at the car and removing the air cooler and throttle body might not be possible for me to do with my limited tools, experience, and lack of work space. I would not say I am going to wing it necessarily but I think I may just try my original idea and be very careful. Do you think that melting through that last thin layer of plastic would be a safer bet that trying to cut it out?

edit: not to mention I can't find any instructional videos online about removing the throttle body or air cooler in the w205 =\

MATTPEREZ39

To follow up, I had great success tapping into the recessed circle that is on the top of the intake manifold. I used a low power hand held cordless drill and SLOWLY shaved off each layer off plastic until I broke through. I used a vacuum on high power and a narrow nozzle to suck directly next to the bit when breaking through to make sure no plastic would fall inside. The tapping point fits a 1/4" NPT (closer to half an inch in diameter)pretty nicely and I used a 7/16 drill bit to make the hole for it. It was slightly challenging to get the NPT into the drilled 7/16 hole as it was barely too small. I used a pair of needle nose, spinning them while closed in the whole to expand it very slightly. The exhaust flap works fast and without any issue. I will edit with some photos tomorrow during the day. Thanks to @dagger22 as you have been my main source of information and helped me feel more confident about doing it myself.