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Old 07-30-2003, 01:47 PM   #1
dlowman
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Default need help with catchcan

Ok guys I am an idiot. I have the catch can mounted, but not sure where all the lines go. Yes I have read the instructions in other posts, but I really need someone to walk me through which lines to plug into for the catch can on the sti. I know it's simple but I just need a little hand holding here.

thanks,
Dan
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Old 07-30-2003, 01:55 PM   #2
Austin
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Do you want to put a catch can on the valve cover vents, or do you want to put a catch can on the crankcase vent?
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Old 07-30-2003, 02:03 PM   #3
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What do you plan to do about the PVC diagnosis connector/sensor between the PVC hose and the intake duct? It appears to be a new sensor in the 2004 turbos (WRX and STi). I asked earlier on what to do about that thing but nobody seem to know. See http://forums.nasioc.com/forums/show...t=greddy+catch and http://forums.nasioc.com/forums/show...hreadid=398599 . There is a link to the way it should be installed for the 2001-2003 in the first link.

What to do?
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Old 07-30-2003, 02:24 PM   #4
dlowman
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Thats the problem. I have this catch can and not sure how I can use it.. I know guys have installed them on the sti. Not sure the best way to do it. The pvc thing does provide a bit of a problem.
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Old 07-30-2003, 02:46 PM   #5
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Quote:
Originally posted by dlowman
Thats the problem. I have this catch can and not sure how I can use it.. I know guys have installed them on the sti. Not sure the best way to do it. The pvc thing does provide a bit of a problem.
I have pictures of my Perrin catch can here.

http://home.kc.rr.com/cerberus

Last edited by Hummer; 09-08-2003 at 01:54 PM.
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Old 07-30-2003, 03:16 PM   #6
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hey Hummer,
What gauge set is that on the dash, and where can you get it. looks great!
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Old 07-30-2003, 03:50 PM   #7
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Quote:
Originally posted by WagonDave
hey Hummer,
What gauge set is that on the dash, and where can you get it. looks great!
Thanks. I got them from Jspec here.

http://forums.nasioc.com/forums/show...&pagenumber=12
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Old 07-30-2003, 05:49 PM   #8
wolverine
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Quote:
Originally posted by Hummer


I have pictures of my Perrin catch can here.

http://home.kc.rr.com/cerberus/STi.htm
Nice exhaust!!! Titanium, right? What kind of gain did you see? What exhaust is it? Any difficulties fitting it in? Thanks!
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Old 07-30-2003, 06:04 PM   #9
StiDreams
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I see that you caught the crank case vent but did not hookup the PVC vent. That's the one I'm having all the questions about.
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Old 07-30-2003, 06:35 PM   #10
Austin
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Quote:
Originally posted by StiDreams
I see that you caught the crank case vent but did not hookup the PVC vent. That's the one I'm having all the questions about.
You can't tell from the pictures what Hummer has done with his crankcase vent. It looks to me like he has installed the Perrin catch can as a valve cover vent catch can, and that his crankcase vent has been left alone.
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Old 07-30-2003, 06:41 PM   #11
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My apologies, I used the wrong terms. The catch can is "usually" installed to catch the valve cover and PVC ventings, not the crankcase. I should edit my other post for correct terminology. In any case, there is still the problem about the PVC diagnosis connector/sensor.
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Old 07-30-2003, 06:55 PM   #12
Austin
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Quote:
Originally posted by StiDreams
My apologies, I used the wrong terms. The catch can is "usually" installed to catch the valve cover and PVC ventings, not the crankcase. I should edit my other post for correct terminology. In any case, there is still the problem about the PVC diagnosis connector/sensor.
If we talking in correct terms...

There is no PVC. It's the PCV. Positive Crankcase Ventilation. Vapors from the crankcase can produce just as much oil in a catch can as vapors from the valvecover vents.

Go disconnect the sensor connector on your PCV, hook up an OBD2 scanner or DD, and report the code that is thrown.
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Old 07-30-2003, 07:31 PM   #13
StiDreams
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Sorry, PCV. I agree that the crank case vent can produce just a much oil as the valve cover vents. I'll disconnect it and see if it thorws a code. I'm pretty certain it will. The question is how do you defeat this thing. I corrected my other threads to reflect the correct terms. Read them and see if you think that one of the solutions that I was looking at seems reasonable.
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Old 07-31-2003, 11:26 AM   #14
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hey dlowman,

Did you ever get that thing in there? Did you end up doing just the valve cover vents like Hummer? Or did you do the PCV also? If so, how did you get around the PCV diagnosis connector/sensor?
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Old 08-03-2003, 12:59 PM   #15
Austin
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Quote:
Originally posted by StiDreams
In any case, there is still the problem about the PVC diagnosis connector/sensor.
The PCV Diagnosis Connector -

DTC P1491 POSITIVE CRANKCASE VENTILATION (BLOW-BY) FUNCTION PROBLEM

Disconnecting/removing the PCV Diagnosis Connector will result in a MIL illumination from a P1491 code.

The PCV Diagnosis Connector detects blow-by hose release abnormality. A 1491 code is thrown when the diagnosis terminal voltage is high. The PCV Diagnosis connector is a 5 volt sensor.
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Old 08-04-2003, 10:34 PM   #16
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Quote:
Originally posted by Austin
The PCV Diagnosis Connector -

DTC P1491 POSITIVE CRANKCASE VENTILATION (BLOW-BY) FUNCTION PROBLEM

Disconnecting/removing the PCV Diagnosis Connector will result in a MIL illumination from a P1491 code.

The PCV Diagnosis Connector detects blow-by hose release abnormality. A 1491 code is thrown when the diagnosis terminal voltage is high. The PCV Diagnosis connector is a 5 volt sensor.
Hey Austin,

Thanks for the info. What do you think about my idea of:

1. PCV to Diag sensor to T, valve cover vents to T, T to can, can back to valve cover input to intake duct, and cap PCV's input to intake duct.

or

2. Same as 1 except go into PCV's input and cap valve cover vent's input to intake duct.

or

3. PCV to T, valve cover vents to T, T to can, can to Diag sensor into intake duct. and cap valve cover vent's input to intake duct.

or

4. Cap off PCV's input to sensor. Do the can mod like before. PCV T to valvec cover vent to valve cover input to intake duct.

or

5. A can with 2inputs and 2 outputs. Essentially 2 cans.

I don't have a can yet. I wanted to use the Greddy one but I'm having a hard time sourcing one with 15 mm. In any case I think I'm going to do #4 and if that craps out, I'll try #1. Hopefully one of the above solutions will be able to avoid the MIL you mention or any other for that matter. When I get a can, I'll update.
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Old 08-04-2003, 11:23 PM   #17
Austin
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Don't try to tie your valve cover vents to the crank vent. Use two catch cans. Crankcase blowby gas scavenging is much more inportant than the rocker covers.

For the valve covers, I'd just run them both into a vented can.

For the crank vent, make only one change - route the hose from the T to the induction pipe differently. Route that hose from the T to the catch can, then from the catch can back to the induction pipe. The hose that goes from the T to the PCV valve - leave it alone. Leave the PCV alone.
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Old 08-06-2003, 11:56 AM   #18
SportyBry
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Hummer:


I LOVE those STi plates inside the door jams- real slick.

Where can I get some?


//Brian
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Old 08-15-2003, 08:55 PM   #19
Hummer
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Quote:
Originally posted by SportyBry
Hummer:
I LOVE those STi plates inside the door jams- real slick.

Where can I get some?
//Brian
http://www.rallispec.com/

Update......I had a Perrin turbo inlet put in three days ago and it does not have a PCV intake. I routed the PCV and valve vents together to the Perrin catch can. It is working great so far {No CEL}

More info here
http://www.imprezawrxsti.com/postnuk...03ecdb18e09aa0

Pictures here
http://home.kc.rr.com/cerberus/pcv_a...by_reroute.htm

Last edited by Hummer; 09-08-2003 at 01:57 PM.
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Old 09-07-2003, 01:12 AM   #20
G-force
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ardDeepandSmoothEverSoCoo

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OK, we've tried this mod today and I can finally understand the reasoning for the PCV Diagnosis Connector but...

could someone please draw or layout the connections in layman's term - a pic is ALWAYS worth a thousand words..

Thanks!
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Old 09-07-2003, 01:28 PM   #21
StiDreams
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I looked at the pics on Hummer's site. The way it looks is:

If you look at the PCV you will see that right up against it is a "T" (PCV factory "T") with 2 hoses comming from it. The skinnier one runs underneath the BOV hose to the intake manifold somewhere. Leave that one alone. The bigger one comes from that "T" (PCV factory "T") and gones to the sensor which is on the turbo intake duct. That's the side that will be "T" (catch can "T") together with the valve cover vent. Hummer said that he dremeled the input to the factory turbo duct off along with the sensor. He put a hose from the sensor and "T" (catch can "T") that together with the hose from the joined valve cover vent and ran a hose from the "T" (catch can "T") to the catch can. From the catch can back to the input location at the turbo input duct for the valve cover vent. He did not have to cap off the input for the PCV because he replaced the factory turbo inlet with a Perrin one. The Perrin one does not have a inlet for the PCV. I'm going to do the same but I will try to remove the sensor from the factory turbo inlet instead of dremeling it off. If that doesn't work then out will come the dremmel.

recap: from PCV to sensor to new hose to "T" for catch can. From joined valve cover vent hose to the "T" for catch can. From the "T" for catch can to the catch can. From the catch can back to the turbo inlet (original location for valve cover vent).
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Old 09-08-2003, 12:45 PM   #22
CloNeGTS
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I looked at Hummer's personally this weekend and while I think your ideas will work....would this be easier/possible?

That hose that comes up to the sensor/input....can we cut that hose, run the PCV side up and splice it into the 'input' catch can line and then just splice the 'output' catch can line back to the input side of the PCV sensor? That would allow you to leave the sensor/input in place, keeping the CEL off, but still 'catching' both valve and crank vents.
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Old 09-08-2003, 09:09 PM   #23
MikeRambot[KaM]
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Default N00b question

Can you guys explain what is the main purpose of a catch can, and why it is good to have? From what I can come up with, it runs air some kinda air lines from air that escapes via valves and some other parts to upper parts of an engine, and when rpms go up it can push some oil there and have it sucked through lines, but where the lines end up? I just wanna justify spending some buck on useless, no-go mod mod? So if it helps keep engine clean, I might get one.. lecture me please
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Old 09-08-2003, 09:23 PM   #24
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Grap on my what?


Perrin's site explains it pretty well. Your post made my head hurt.

http://www.perrinperformance.com/pro.../catchcan.html
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Old 09-13-2003, 09:16 AM   #25
links_courses
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I installed a Perrin Oil Catch Can on my 2004 WRX yesterday with no problem. The directions state:

1) Cut the inlet hose to crankcase vent tube (fat hose) after the hose makes its right turn. (Cut where the hose is running parallel to intercooler.) See picture below.
2) Turn the hose connected to the inlet tube toward the right side of car. Now both cut ends point toward driver's side.
3) Insert the 1/2"-3/8" connectors into each cut hose.
4) Attach the catch can hoses to these two connectors and the other ends to the cath can nipples.

I don't see what the "sensor" problem would be with this install? All you are really doing is "adding length to the stock hose" with a catch can in the middle?

What am I not understanding here?

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