Ffim catch can advice.

**toyotanos** · August 16th, 2012, 12:31 PM

Yep, sounds like you have the right idea!

***kotu100*** · August 16th, 2012, 12:44 PM

Any idea where I might find a check valve. I found that IJ is using a "fuel miser 102" metal PVC valve but I haven been able to find a source on where to buy them. The only other check valves I could find we're fuel check valves. Not sure if that would work. I saw the way nashman has his system hooked up and that's what I'm going for.

**toyotanos** · August 16th, 2012, 12:49 PM

You don't want a check valve, a PCV valve will work correctly. You want flow in both directions through the intake manifold hose. Just look for a PCV that fits your application. In my case I'll be running a 1"-> 1/2" coupler at the catch can, then running it over to the backside of the FFIM, then a PCV plugged into that hose then into the intake.

***kotu100*** · August 16th, 2012, 01:44 PM

So I could use just any generic PVC valve?
How about if I were to tap the ffim and install one like in the link below?
http://www.thepartsbin.com/catalog/?...CIoBEIMIMAc4Cg

**toyotanos** · August 16th, 2012, 01:56 PM

Not sure if 'just any' PCV valve would work, I suspect that's why IJ used that specific metal one(but I'm still not sure). More research will be needed to find the best answer, I think.

**IBoughtASupra** · August 16th, 2012, 03:01 PM

If it seals when boost hits, I don't see why it wont work.

**toyotanos** · August 16th, 2012, 03:27 PM

Because you always want movement in the system. If you only allow vacuum to suck stuff in, what is there to help the gasses move during boost? It ties back to where you don't want *only* crankcase pressure moving the gasses. Just lie the factory did, letting a little flow reverse back through the PCV system allows it to do its job better.

Intake pressure/vacuum moving + PCV vapors = positive crankcase ventilation.
PCV vapors + crankcase pressure = crankcase ventilation.

One is better than the other.

***MarkIII4Me*** · August 17th, 2012, 04:55 AM

So how much of a boost leak will you get from running a pcv from the ffim? Won't this cause problems?

**toyotanos** · August 17th, 2012, 08:24 AM

You run a restrictor into the manifold, just like the factory throttle body had. It is a small leak, but since its going back into the intake system after the MAF it won't mess up your MAF signals/AFR's.