Catch Can Routing Ffp No Pcv

[stÖrmy]

Although this topic has been covered millions of times i couldent really find an easy diagram to follow, the d1 installation guide has tiny pictures and i couldent see how it was routed..... and most of the other photots ive used as reference had the stock intake manifold, i have a FFP.. I also have my MAF directly infron of my throttle body.

so in the attached photo, can i :

Block of the GREEN

Split the red, into catch can

Vent the yellow into an intake pipe or stick a little filter onto it ?

OR

Green port into 1 side of catch can, Then

Split the red and have a t-piece, and put other side of catch can into the t-piece

Vent the yellow into an intake pipe or stick a little filter onto it

OR

Green and Yellow into catch cans, and leave the red as is ?

[LTHLRB]

My rb25 has both the yellow and green parts removed/blocked off and works perfectly. But block the green. Split the red and run the yellow into your intake pipe.

[stÖrmy]

Im running a pod strait of turbo so no piping, and the maf is infront of the t/b.

If i route yellow to intake wont the oil blow by stuff the maf up ?

[LTHLRB]

Factory nissan has the yellow part routed like that. If your setup is like that then block yellow and green off then t piece the red straight to the catch can

[stÖrmy]

Ok sweet thanks for the replies mate, forgot to add though, my catch can doesnt have a breather on it... can i still route it that way?

[Kane_R32]

if the catch can has 2 ports, have one from the split red going in, and put a breather on the "exit" if your not plumbing it back into the air intake...

[LTHLRB]

What kane said.

[stÖrmy]

Sweet, i could also just put a breather on the yellow yeah? Red and yello are thd same pipes hey ?

[LTHLRB]

You could. Or you could get another 90 deg elbow like the other one and not have the breather there at all and use that one as the t piece used in the middle.

[LTHLRB]

Like this setup

[Dan_J]

put a mini breather/air filter on the catch can then just connect the breather lines off the rocker covers into the catch can, no intake needed if you have a mini breather on the catch can

[stÖrmy]

Ok sweet i get it now hehe, only reason i didnt want filter on can is cause i was gonna have the can lying down flat and disnt want it to leak, but i think ill just have it standing up and do what you guys said.

Thanks again fellas !

[KiwiRS4T]

Two problems with a breather on a catch can -

1. They are illegal most places

2. You can end up with unpleasant fumes inside the car.

if you have a properly designed catch can then the baffles will ensure that oil is deposited in the can and you can safely vent it into your turbo intake

[stÖrmy]

can is baffled, and its a drift car so oil fumes are the least of my "smelling" worries

[Kane_R32]

if you have a properly designed catch can then the baffles will ensure that oil is deposited in the can and you can safely vent it into your turbo intake

My understanding, the oil fumes entering the air intake will hinder the quality of the air (for combustion/efficiency), though fuel is made from refined oil so I can't be sure.

Probably not a noticeable loss anyway right?

[KiwiRS4T]

My understanding, the oil fumes entering the air intake will hinder the quality of the air (for combustion/efficiency), though fuel is made from refined oil so I can't be sure.

Probably not a noticeable loss anyway right?

Doesn't seem to bother the big HP Japanese race cars who vent to the turbo intakes (or my RB30 for that matter )although they will have proper catch cans and sometimes an additional air/oil separator as well - but for the OP both of my points don't apply as for a track car legality is not an issue and he is not worried about fumes.

[stÖrmy]

One more thing guys does it really matter if the can is higher than the ports? Ive read it needs to be below the t/b but with a ffp that means it has to be beliw the headlight??? Wich is not ideal

[KiwiRS4T]

Never heard that one. The top of mine is higher than my throttle body (I have a FFP as well).

One other thing for motorsport there is often a requirement that catch cans have to be a minimum of 2 litres which a lot of ebay type ones are not.

[blind_elk]

Effectively, Yellow and Red are the same. So, leave the Red "U" tube alone, join the Yellow to one side of the "catch can". If this is a track car, you will need to direct the other side of the "catch can" somewhere other than atmosphere - this gives you an oil / air separator. On the track, they are going to be concerned about the potential to drop oil on the track - a can vented to atmosphere presents such potential. Block off Green - although it really should be connected to a PCV valve.

As you will have found in the many threads on the subject, loose pack the can with steel wool to give the oil vapours something to condense on. And because it is dealing with vapours, ie gasses, it doesn't matter a rotund rodent's derriere how high the can is relative to other engine components.

The required volume of the catch can depends on the engine capacity. Smaller engines require smaller minimum can sizes, obviously.

And the reason you need to separate the oil from the vapours is that any oil that gets into the intake air stream lowers the overall octane rating of the fuel/air mixture, leading to an increased risk of detonation on boost.

While you are in there, you will get far better benefit by moving the pod to a place where it can always get cold air. As it is, it is taking in hot air from the engine bay, the turbo is compressing it (making it even hotter), then the IC is trying to cool it back down again.

[stÖrmy]

Very informative post, thanks mate

Well i have set it up andit seems ok, however ive run into a few other issues with the engine un-relating to the catch can ( i think ) but i will make a new thread for that