FAO People Running FMIC's
18 February 2009, 05:28 PM
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Q1. Blanked off, but if you're running a maf based ECU, may be best to use the std recirculating one.
Q2. I hope not!
Q2. I hope not!
18 February 2009, 05:29 PM
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18 February 2009, 08:44 PM
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Cool, thanks again for the replies guys!
Guess it isn't crucial on either which DV or catch can really it seems
Think I might try the OM Re-Circ to try to make the car run smoother when I put the FMIC on.
Guess it isn't crucial on either which DV or catch can really it seems
Think I might try the OM Re-Circ to try to make the car run smoother when I put the FMIC on.
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18 February 2009, 08:46 PM
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Catch can because of breather delete silicon inlet pipe (sounds wicked), and a Forge VTA that I've had for many years.... simply because I can't find the bung to block the pipe off with !
HTH
dunx
HTH
dunx
18 February 2009, 11:16 PM
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dont think a catch can is a must with an fmic i hope not mine has been running great for the 2 years my fmic has been on and i have a hks ssqv as my car came from japan with that being the only mod 
19 February 2009, 08:10 PM
#13
So in my personal opinion i would definitely install one and try and plumb it into cranke case and breathers on rocker covers.
Good Luck
An example of a DIY here>> DIY Hyperflow Catch Can Install - Rexnet Subaru Forums
Last edited by STI_Baly; 19 February 2009 at 08:12 PM.
19 February 2009, 08:20 PM
#14
The point of a catch can is to minimize the amount of oil vapor that's fed into an engine's air intake tract.
If you've taken the intercooler off a car with even a few thousand miles on it, you'll likely have found the inside of it to be coated with a fine layer of oil. This oil coating is also typically found in the 'Y" pipe, the throttlebody, the cold side of the turbo, and the intercooler to throttlebody hose. This oil coating is very common and isn't usually indicative of a major issue.
Why would I want a catch can?
Catch cans are useful on many, many different kinds of cars- NA and Turbo Subaru's included.
There are two, maybe three specific reasons you might want a catch can:
1) You don't want to effectively lower the octane of the fuel you're running- the oil vapor that doesn't condense on the walls of your intake tract ends up in the cylinder, to be burned away for emissions purposes. The effective octane of oil is significantly lower than that of petrol; having it in the mix will effectively lower the octane of whatever fuel you're running.
2) You've got an intercooler- by definition an intercooler is part of your intake tract, and It's generally agreed that an intercooler which is internally coated with oil won't be as effective as one that's clean.
3) You want something pretty under the hood.
Where does this oil come from?
On a WRX, this oil gets introduced into the intake tract via two hoses- the one coming from the PCV (Postive Crankcase Ventilation) valve and the valve cover vent lines.
Valve cover vent lines? There's more than one?
Yes, but they're T'd into that black tube which runs in front of your intercooler. The third part of the T is a hose running to your inlet pipe.
I hope this helps.
If you've taken the intercooler off a car with even a few thousand miles on it, you'll likely have found the inside of it to be coated with a fine layer of oil. This oil coating is also typically found in the 'Y" pipe, the throttlebody, the cold side of the turbo, and the intercooler to throttlebody hose. This oil coating is very common and isn't usually indicative of a major issue.
Why would I want a catch can?
Catch cans are useful on many, many different kinds of cars- NA and Turbo Subaru's included.
There are two, maybe three specific reasons you might want a catch can:
1) You don't want to effectively lower the octane of the fuel you're running- the oil vapor that doesn't condense on the walls of your intake tract ends up in the cylinder, to be burned away for emissions purposes. The effective octane of oil is significantly lower than that of petrol; having it in the mix will effectively lower the octane of whatever fuel you're running.
2) You've got an intercooler- by definition an intercooler is part of your intake tract, and It's generally agreed that an intercooler which is internally coated with oil won't be as effective as one that's clean.
3) You want something pretty under the hood.
Where does this oil come from?
On a WRX, this oil gets introduced into the intake tract via two hoses- the one coming from the PCV (Postive Crankcase Ventilation) valve and the valve cover vent lines.
Valve cover vent lines? There's more than one?
Yes, but they're T'd into that black tube which runs in front of your intercooler. The third part of the T is a hose running to your inlet pipe.
I hope this helps.
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