Hey, is there a "how to" for installing a catch can?
I'm a little lost here.. Someone please point me in the right direction.
Thanks!
There isn't one, oddly. I know quite a few have installed one. Including me!
It's certainly not difficult.
Biggest tip I can give is to go for a good baffled can and get pipework that matches the stock pipe END internal diameter
Noted!
I'm not sure what pipes go were though..
Quote from: mr2turboguy on April 9, 2020, 22:53Noted!
I'm not sure what pipes go were though..
Ah OK.
Well it's really one pipe you're replacing. It's the one that goes from your PCV valve to the throttle body.
It's the pipe that sticks out from under the black plastic engine cover, on the left side of the engine. Follow that pipe and it will take you to a pipe that sticks into the top of the throttle body.
It's very fiddly work to get it onto that throttle body, mind.
What you're going to do is remove that pipe and replace it with two pipes. One that goes from the PCV valve to the "IN" of the catch can. Then from the "OUT" of the catch can to thr throttle body.
Right, I figured that was what I had to do. What's confusing me is that the pipe that goes from the TB to the head is blocked off. Was it originally there to create a suction and blocked so when on boost it doesn't blow back?? The guys at RRR did it. Do I just block the TB side and add a breather filter on the head side?
I have a mishimoto copy baffled catchcan on my turbo car on the PCV line from the front/side of valve cover as shnazzle says and back to throttle body, as car its a turbo it needs a 1 way valve to stop boost entering the valve cover and i got 1 of suitable size from a subaru in scrap yard.
Can works well trapping any oil residue from the vapours coming out engine, i dont get much build up in can (thankfully as its only small) and i check it every few weeks or recently at trackday made sure it was empty before start and checked at end, only a tiny bit in there which is good, if you get a lot in there its a sign engine is worn and breathing heavy. I have a tap i can fit into bottom of can but quality isnt great so i just unscrew it to check.
Its common on turbo installs to have the rear valve cover vent vented to air via small filter (mine is plumbed into intake pipe pre-turbo) but the PCV from the front/side of valve cover should have vacuum on it to help extract the corrosive gas from engine and burn it in engine, with a turbo conversion some do just fit a filter to PCV but its not best way imo and needs to be connected to vac source like intake to pull the vapours out, while the PCV valve itself is 1 kind fo 1way valve it should not be relied upon to stop boost from turbo so extra 1way valve in line is best way to be sure you dont pressurise engine with turbo boost.
I have a couple more of same catch can 1 of which im hoping to fit in the rear vent from valve cover, but i need to source some larger bore fittings as the ones that came are too small for this larger pipe, ok for PCV which is smaller.
Might be worth getting some pictures of your current breather setups so we can see how your setup at moment
Sorry, your name should have totally given the game away that that port would be blocked.
As
@thetyrant says, the only vacuum source you can use is pre-turbo,which is where the SP240 kit has it plumbed.
Also agree that just putting a filter on the end of the PCV isn't sufficient as it doesn't "suck" the oil vapour out.
So,in you case it would be PCV to catch can to intake pipe before turbo.
Quote from: shnazzle on April 10, 2020, 10:51Sorry, your name should have totally given the game away that that port would be blocked.
As @thetyrant says, the only vacuum source you can use is pre-turbo,which is where the SP240 kit has it plumbed.
Also agree that just putting a filter on the end of the PCV isn't sufficient as it doesn't "suck" the oil vapour out.
So,in you case it would be PCV to catch can to intake pipe before turbo.
I tried the PCV to intake pipe pre-turbo but there is little to no vac on that due to the large diameter and slow gas speed at least at lower revs, i ended up going back to the stock SP240 breather setup which is as below.
Large vent port on bulkhead side of valve cover rerouted to intake pipe pre-turbo, the large port on throttle body is then blanked off, both of these is same with as its done on TTE-Turbo, all be it in a different place due to pipework being different.
PCV on side of valve cover was connected as per stock layout to intake manifold/throttle body on the car i took turbo kit from, thus relying on the oe PCV to stop boost entering engine which is risky!, again same as TTE i believe, I have fitted an extra 1way valve in the this pipe allowing gas to exit engine but not boost to enter, belt an braces over the PCV valve, ive also fitted the catch can in this line with extra 1way valve between intake and catch can so it doesnt pressurise catch can.
To summarise here below is my setup.
PCV valve > catch can > 1way valve > intake manifold.
and..
Large Vent on bulkhead side/front of valve cover > Turbo intake pipework with Port on throttle body blanked.
I think this is the best way as a minimum to allow engine to breathe and stop boost entering valve cover, i do wonder about reconneting the large vent on front of valve cover as in OE spec there is huge vacuum there which must be for a reason, most people just put a filter on it to atmosphere and blank the port on TB as its thought to be more for letting excess air out the engine but toyota had it under strong vac so makes me wonder if better to do that, ive got a catch can for this just need larger ports and suitable 1way valve, future project.
Okay thanks for all the info guys, very helpful!
It was looking so neat before I had to do all the vacuum lines and bloody sensors haha
Okay so this is what I think I'll do..
Pcv valve > catch can > 1 way valve > intake manifold
Blank off TB & breather filter on large vent on bulkhead.
My intake to turbo is in the driver's side vent so don't want to run lines that way and have to bung holes in it and all that.
Hopefully it's all good, will send pics when I've done it.
Thanks again guys
Sounds like a plan, what is the current setup breathers wise ? is the PCV on side of valve cover not connected to anything at moment?
It's all as it was from factory. Except for the one that goes to the large vent on bulkhead which was just disconnected and clamped. Not great I know, been meaning to sort it since December.