Hey,

Total noob here, trying to get a catch can installed in my d16z6 turbo.

At the moment this just vents out to athmo.



In general, the car runs "perfect" only problem I have is that the map sensor keeps getting dirty from oily fumes, resulting in map sensor not working correctly anymore
and the car can not drive with turbo load anymore.

Thats why i was thinking to add a catch can to the setup to get rid of this problem.
Since I am a total noob I would be super glad if someone can point me in the right direction.

I looked at every available source regarding this topic for ages but every "guide" thread or whatever leaves me with endless more questions,
or I find it not working for my specific setup.

Does this make any sense?

 

Man I don't fool with the check valve or having anything routed back to the intake manifold. My setup (passive) has two lines off the valve cover going to the side of the catch can and one line off the back of the block going to the bottom of the catch can, so any oil that gets pushed in can drain back.

You'll hear arguments for and against a drain-back system like I use, and for and against a positive ventilation system that uses vacuum from the intake manifold. You'll just have to chose the system that you think will work best.

 

Hey thanks for answering this thread.

You are absolutely right about this, def. comes down to taste and what works.

This is also why I am seeking help, because I can not make sense out of the specific issues I got, map sensor clogging up by oily air.
Since the valve cover is vented to athmo atm. the oily air can not come from there, So my best guess was to connect the catch can to
the pcv valve and the valve cover and reroute/T it to the intake. Def do not want to have the valve cover went to athmo in the new setup.

The Idea with the check valve came from the catch can sticky thread on this forum.

 

How are you verifying that the oil residue you're seeing on the MAP sensor is what's causing your issues? I'd be surprised if that's your issue.

Venting the crankcase into the intake isn't going to reduce the amount of oil vapors the MAP sensor sees...it will likely increase it.

 

Hey, thanks for the reply.

Because when i clean the map sensor the car runs fine again for some time 50-150km, brought the car to a mechanic too, he said the same thing.
Do you have an idea how to get at this problem?

 

A few questions:

1. How are you tuning the car for turbo / what ECU are you running?
2. What specifically happens when "map sensor not working correctly anymore and the car can not drive with turbo load anymore."? Any CEL's? What's the datalog look like?
3. What MAP sensor are you using?
4. Have you verified there is no damage to the sensor or connector on the harness, and that you're getting a good connection between the two when plugged in?
5. Have you tried swapping in a different sensor?
6. How are you cleaning the MAP sensor?

 

1- car was tuned at a shop, hondata 3000
2- when map sensor is clogged up the car stalls once the turbo tries to spool up, it just goes tschtschktschk but nothing happens anymore
3-hondata 4bar map sensor
4-changed the sensor 1time , but not the connector so far, connector still looking good though. But yes, will def check this more extensive.
5-yes, bought a new one at a point, same model, hondata 4bar
6- using special map sensor cleaner

Thanks again !

 

That’s what I think also. The oil residue on your MAP sensor may be from your turbo leaking oil into the compressor side of the turbo.
You should take off some of your charge pipes (air inlet pipes) going to the throttle body and see if there is oil residue in there also. You should look at the inside of your intercooler to see if there is oil puddling up in there too.
Is your turbocharger old or new? Do you have an oil restrictor on your oil feed line going into the turbo? You could be sending too much oil to the turbo and it’s seeping past the turbo into your charge pipes. Or it could be a bad oil drain set up where the oil is getting clogged in your turbo rather than draining with gravity back to your oil pan.
Getting a catch can set up is a good idea, but it won’t really change the oil on your MAP sensor. If you route your catch can set up back to your air intake pipe, you might see an increase in oily air.
Also, I wouldn’t use the intake manifold as a spot to route your catch can into because when the car is under boost pressure, that’s when your catch can set up should be working, and putting a check valve will stop it from pulling air back into the engine. It should be routed to your air intake pipe before the turbo, or drained back into the block or maybe oil pan.

 

Yes, I did that, pipes are all clean, no oil in there.
This is where I looked.

Turbo is a bit older, need to check at the car to answer your other questions.

Thanks for the reply !

 

A proper OEM one-way check valve (non-Honda) will work fine connected at the intake manifold. It's one way, so it doesn't ingest crankcase ventilation under vacuum. (See sticky at the top of the FI forum). But this sounds more like a turbocharger issue, not a crankcase issue in this case with the information given.

 

Record a datalog of the issue happening and post it and your calibration to a new thread on the Hondata forums (S300 sub-forum) and I'll try to take a look at it. Or if you want a professional opinion, take it back to the shop that did the tuning and ask them to look at it.

 

That was also my first idea, turbocharger issues, brought it to a shop because of that some months ago, they said it is not the turbo. But idk. I am a bit undecided about trusting the shops ideas about the car. Is there a way for me to test the turbo?

And yes, got that check valve idea from your sticky thread. so is the setup for the can i posted possible? Or am I being an idiot? .-) My idea was to catch can what comes from pvc valve and valve cover and route it back to the intake.
like on the picture a bit above in the thread.

Regardless of fixing the problem or not, am not liking the setup venting to athmo, would def. prefer a more closed setup with a can.

 

Hey, thanks a lot, for your offer but I do not think I need to steal time from you like that.
The car just got a fresh tune/service, everything so this "should" be good, the shop says that the car has no
problems at all and it is just the issue with the oily air clogging up the map sensor.
They also stated that it is not the turbo that is at fault, I would just need a catch can setup.

But idk, not feeling the shops ideas about the car 100%. the tune is perfect though, just their ideas about
what the problem is does not resonate with my perception of the problem that much since my innitial idea about what is at fault
also brought me to think it might be the turbo, but I am not knowledgable.

 

But you do have the ability to deduce issues, so give yourself a little credit

Could it be a bad map sensor that is not sealed well against residue? I've never really used anything but sensors from other OEM cars, so .... Could be a possibility? just asking a silly question.

 

Well, if you do decide to, I try to look at the Hondata board once or twice a week, usually.
Maybe? I'm using the Hondata 4-bar sensor also, and I'm almost certain it's made in China like the rest of the non-OEM sensors. I had one fail that Hondata replaced. Without cutting one open to compare the guts of the sensor with a Denso sensor, it'd be hard to tell if the Hondata sensor was lacking some kind of barrier to keep crud out. From the outside it looks identical to a throttle body mounted Denso sensor, with a small "tube" that sticks down into the throttle body to sense the pressure within.

 

It's a shame that they stopped making the 3-bar map sensor, as most applications here rarely if ever use it. I would have just replaced with a different map sensor (perhaps a similar one with the same voltage Reading that Hondata can see? I'm sure that's a selection feature in the management tool of the software), to confirm. If I were running Hondata, that's what I would do.. Replace the sensor with one of similar voltage reading and see if there's any issue there.

I can say with certainty that there are NO Denso components in your MAP sensor. So, there's no help there.

 

Thanks mate! Yeah I am trying .-)
That is def. a possibility, since there is no shielding at all, it is just a little open nozzle with no filter or anything, everything just goes straight in.
And yeah, I changed the map sensor for a brand new one from hondata.

 

Cool, thanks a lot!