Who's running a catch can?

tranceformer

I've definitely seen a catch can in a few TT Z's down here in Florida.

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Ray
2009 370Z Base Sport 6MT / 12.860 @ 109.09mph / 1.921 60ft / street tires
official 1/4 mile track times

Ron

toner123

i guess the real question is, do we really need to have one? Like what are the Pro's and Cons of it

Nixlimited

No cons other than extra connections and a marginal amount of extra weight and space needed. Pros are less oil coating the intake tract as well as the fact that the vapor that is burnt off in the combustion chamber allegedly lowers your effective octane rating i.e. tends to promote detonation. That's what I was told at least on my old STI. I would be very surprised, however, if NA cars collected the same amount of oil as FI cars. The increased pressure of the FI tends to cause more blowby and more junk ending up in the intake tract. With that said, factory turbo cars come without catch cans so it may be overkill.

Note: I also had two lines on my STI and I ran twin cans rather than 1.

toner123

seems like a mod I should do then. Modme could you give us a DIY since I am familiar with your style and used your TT Diy to install mine into my Z

wstar

I posted a DIY when I did mine, over here: DIY - Oil Catch Can (w/ M370 + Batt Reloc). Mine's specific to my setup though (M370 intake manifold, and an empty battery compartment as a convenient location - may as well use the battery compartment heat shielding to promote vapor condensation in the can), but there's some general notes and ideas there too if you read through it.

All in all, doing your own catch can install is pretty simple once you understand where things hook up, you just have to decide where and how you'll mount/attach it.

I would think in general you'd be right about FI getting more blow-by, seems to make intuitive sense. But that just puts more blow-by into the crankcase, which is mostly fuel vapor. From there you're venting the crankcase through the PCV valve, and the crankcase shouldn't be at abnormal pressure, and most of the rest of the vapor is oil vapor from there. It may be that the rate of catch can condensation is mostly driven by crankcase pressure/airflow, which shouldn't vary much for FI vs NA.

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wstar

Oh and the primary Con, IMHO (and the reason factory cars never come with a catch can): it's another maintenance task you have to keep up with. If you don't dump out your catch can on time (on our cars, seems like once an oil change would be fine most likely, maybe twice if you're paranoid), the can could eventually fill up too much.

If it filled completely, or even filled far enough that the fluid can creep up the sides to the level of your outlet hose in a high-G corner, you could suck the liquid contents of the can into your intake. The condensed oil vapor + whatever else is thicker and greasier than your normal engine oil.

Imagine pouring 1/4 cup of thick greasy oil straight into your intake in one shot, while the car is at high revs pulling through a corner or whatever. At the very least I'd think you'd get some bad knock for a couple of seconds and have a mess to clean in your intake manifold, but there could be worse consequences. I don't plan on finding out

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Journal thread / Car setup details

modme

Actually, crankcase pressure/airflow are completely different from NA versus FI. In NA, you will never reach positive pressure inside the intake manifold. During WOT, pressure in the manifold will drop down to zero, the PCP valve will close and crankcase air will vent minimally through the crankcase vent.

However, in FI, your manifold pressure will reach up to 12 psi or whatever boost level you are running during WOT. So now the PCV valves close, but you have significantly more pressure venting from the crankcase vent to the air intake piping. How much oil vapor is blown through during this process, I am not sure.

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GTM Twin Turbo Stage 2|GTR Turbo/Engine Gauges|KW V3 Coilovers|HKS Exhaust|Oil Cooler| Vossen CV1

modme

Pro:
-Prevent oil from gunking up the MAF sensor and throttle body
-oil will lower the octane level of gas in the engine

Con:
-Cost of the catch can

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GTM Twin Turbo Stage 2|GTR Turbo/Engine Gauges|KW V3 Coilovers|HKS Exhaust|Oil Cooler| Vossen CV1

Zoren 370

What does it do for your Z?

Chuck33079

A catch can? The same thing it does for any vehicle. It collects the vapor that the pcv system and crank vent feeds back ito the intake tract. This way you're not adding oily vapor to the clean fresh air your motor is trying to burn.

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O&G

I welded my intake inlets shut, PCV valve is still stock and the crank case vent tubes are open at the moment, debating on hooking them up to a can to collect the very tiny amount of oil that vents out @ WOT. If you go w/ that setup get small cans!

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JB-370z

It was dark in my garage so the iPhone pics are horrible. I had to use regular black hose that does not bend easy because the clear hose Top Secret sent was too short due to TT setup. Does anyone know where I can get more clear hose so I can get rid of this black stuff?

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erkthejerk73

go to any auto parts store and ask for Clear PVC fuel line, you should then be able to buy it by the foot and reinstall it. make sure it is stiff enough not to kink.

ANMVQ

Are SC guys running these, Get my SC installed on Tuesday?

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