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GVR-4 greddy oil catch can install questions..

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Jason84

15+ Year Contributor
948
3
Jul 10, 2003
Manitowoc, Wisconsin
well got my new motor all in and done... putting on my catch can now..

im wondering how did everybody else install theres?

i was thinking of putting a hose barb where the pcv usually goes and run a T to the valve cover breather... and then the other hose goes to the intake right??

or is there another way of doing this?



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yes it is... unlike other DMS's they dont really make alot of radiators for GVR4s... the only one ive found is a koyo for evos which you sorta have to modify or a C&R for $500.

otherwise id have one already.. just saving up for the C&R though.
 
Alright I ordered a new intake from dejon to fit my 50 trim correctly and I recieved it without the 2 vacume nipples that go to the valve cover and im not sure where the other hose connects to. but I have a catch can in the garage to use I just need to know how to run it. i know its not the same as my srt-4 and thats why im confused.

a diagram would be great
step by step would do well also

thanks guys.
 
the nipple on the side of the valve cover, to the passenger side. hook one tube to that. hook the other tube to the the intake nipple. then plug both into the catch can. you're good to go. there should be an extra large vac hose floating in the passenger side of the engine bay somewhere that plugs into that other large nipple.
 
Those nipples are an option from dejon tool & you can select any combo of the 3 stock nipples. Ones for the crank case vent ones connects for emissions & the other is for the stock bcs. If you want to hook up your catch can then best method is to have a sealed catch can so one hose from it goes to the valve cover while the other goes to the intake. This will keep the car running like stock & not give you the oily intake issue.

If your catch can has a filter/is vented you can hook one hose from it up to the valve cover if you don't have the nipple on the intake as some people do this but this isn't the recommended method & won't operate like stock. With this setup you end up pulling unmetered air in, this happens because of the pcv valve on the valve cover. The pcv is basically a on way valve that closes under boost so the crank case doen't see boost pressure but it opens under vacuum to circulate all the air from the crankcase back into the intake. When this condition happens you end up pulling air from the vent on the catch can that hasn't been metered. How much this effects your tune, that I don't know, I do know it will throw your g/rev off at idle.
 
maybe i was not clear....sorry guys.

The only tube i have on the intake is for the BOV.
 
It's simple. Just grab the two lines that used to go to the intake and hook them up to the catch can. One is from the valve cover and the other is from the charcoal canister under the battery (emissions stuff).
 
It's simple. Just grab the two lines that used to go to the intake and hook them up to the catch can. One is from the valve cover and the other is from the charcoal canister under the battery (emissions stuff).

Do you actually know its okay to do this or are you just taking a guess? Do you know if the origional poster has a vented or sealed catch can? I don't know the emissions routing so I can't verify its connection but more then likely it needs fresh air just like the valve cover, since that the whole reason their attached to the intake. If you attach the lines to a sealed catch can where are you getting fresh air from? More then likely you aren't & this isn't a good idea (but would have to check emissions routing to be sure). If his catch can is vented then it should be no problem to hook up the emissions line but the valve cover line will still take in unmetered air.
 
I know it's ok...i run my car with no emissions and the valve cover breather completely open.
Like you said, you get a lil bit of unmetered air in at idle and cruise but nothing that will harm the car.
 
I know it's ok...i run my car with no emissions and the valve cover breather completely open.
Like you said, you get a lil bit of unmetered air in at idle and cruise but nothing that will harm the car.

Ya thats probably okay, like I said you will get some unmetered air & you can easily spot this with dsmlink but as to how much it effects your tune I have no idea & it doesn't seem to be something that others know either. I just know that one of the first things they say to change when you are having tunning issues (could just be to help rule things out) I was more concerd if his catch can was sealed & he hooked both hoses to it. Then unless the emissions has some other inlet for freah air, you won't be getting freah air into either of these areas which is probably not a very good idea. Thats why I was wondering what type of catch can he is planning on running?
 
I just installed my Greddy catch can and I had to do some research before I installed it. To those who read this, there IS a right way and a wrong way. Here's a diagram of the RIGHT way. Needless to say, it doesn't matter if you have an SMIM or not, you NEED to pull vacuum for the PCV. Eliminating it doesn't necessarily help as much either (although you can draw your own conclusion from your own research, I decided to keep mine in stock operation).

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For those who have an FP pipe, it IS possible to drill into it. It's made up of about 1/4" aluminum piping and can be drilled by using a pilot drill (I used 11/32", but whatever) and then ended up using a 3/8" so I can put on a 3/8" brass NPT nipple.

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My actually routing: (VC > Catch can > Intake pipe) & (big vacuum port from JMF to new OEM PCV).

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Why is there 3 lines coming out of the valve cover? I know there is the breather on the left side and the pcv but what is the other for? Also you are running 2 catch cans? :confused:
 
Ahhh I see now cool, so the pcv goes into a check valve which goes into the back of the Jm fab smim? If so why do you need a check valve and not run the pcv into the back on the smim? Sorry for all the questions but my JM smim should be here in a few weeks.
 
Here is an install of the Saikou Michi Co. Dual Chamber catch cans. They work great and the quality of Mr. Saikou's craftsmanship is outstanding! I did ask him to make them 5 inches long and not the standard length of 6 inches. This made installation much easier and didn't seem to have a negative effect on the performance in any way that I could tell.

All the mounting hardware (hose, clamp's and brackets) and 2 polished cans cost me $152.00 delivered to my door. The service was excellent! They were custom made and still were delivered in less than 2 weeks from my on line order.

The mounting position for each can is as follows:

1.) intake - front mounting hole from where CC diaphragm was removed

2.) PVC - Used Brake line Proportioning valve mounting bolt against firewall.

I realize than there are many different catch cans out there, but these clearly perform as advertised!

Hope this helps.

Pres
 
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