Are my CRV and ABV valves flipped and does it matter?
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Are my CRV and ABV valves flipped and does it matter?
Edit: changed ACV to ABV, forgot that acronym...
Hey everyone,
I recently was going to vent the stock bov (ABV) to atmosphere but after looking at some pictures I'm wondering if the person who I bought the car from installed the intake and ABV/CRV incorrectly. From what I see in pictures they look a bit backwards.
Now from what I see in diagrams and pictures the ABV is towards the front of the engine bay and should connect to the bottom apexi intake. Mine is hooked up like this.
To me this looks like the valves were switched and the ABV is where the CRV should be. Not sure if the valves are identical (CRV can act as ABV and ACV can act as CRV). If this can happen then it also looks like these are venting into the opposite intake of where they are supposed to. Since they're are just venting I don't think it's a big deal but wanted to make sure I wasn't venting the CRV to atmosphere when I do this mod and screw something up.
Hey everyone,
I recently was going to vent the stock bov (ABV) to atmosphere but after looking at some pictures I'm wondering if the person who I bought the car from installed the intake and ABV/CRV incorrectly. From what I see in pictures they look a bit backwards.
Now from what I see in diagrams and pictures the ABV is towards the front of the engine bay and should connect to the bottom apexi intake. Mine is hooked up like this.
To me this looks like the valves were switched and the ABV is where the CRV should be. Not sure if the valves are identical (CRV can act as ABV and ACV can act as CRV). If this can happen then it also looks like these are venting into the opposite intake of where they are supposed to. Since they're are just venting I don't think it's a big deal but wanted to make sure I wasn't venting the CRV to atmosphere when I do this mod and screw something up.
Last edited by nemix; Apr 18, 2015 at 10:00 AM.
Joined: Nov 2011
Posts: 3,425
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From: okinawa to tampa
the CRV is the stock BOV and is connected to the forward leg of the y-pipe. the ACV is connected to the aft leg of the y-pipe and vents the air from the secondary turbo until that magical moment happens when all those doors and actuators move and the car goes faster.
your valves are plumbed properly. it matters not into which intake they are vented to. there is no defect in your current set up.
your valves are plumbed properly. it matters not into which intake they are vented to. there is no defect in your current set up.
Thread Starter
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Joined: Sep 2014
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From: Sacramento
the CRV is the stock BOV and is connected to the forward leg of the y-pipe. the ACV is connected to the aft leg of the y-pipe and vents the air from the secondary turbo until that magical moment happens when all those doors and actuators move and the car goes faster.
your valves are plumbed properly. it matters not into which intake they are vented to. there is no defect in your current set up.
your valves are plumbed properly. it matters not into which intake they are vented to. there is no defect in your current set up.
From reading around I thought the CRV is designed to vent boost from the secondary turbo when it is prespooling. A few people mentioned leaving that hooked up as is.
Turbocharger Overview
Also, doesn't this diagram show the CRV connecting to the aft leg of the y-pipe? Or am I looking at this backwards?
http://www.turborx7.com/images/Techn...e_diagram2.jpg
Last edited by nemix; Apr 18, 2015 at 09:59 AM.
Joined: Nov 2011
Posts: 3,425
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From: okinawa to tampa
****, everything i said but switch acv and crv around. I also got my acronyms messed up =[
But yes, you are correct. The crv goes on the aft leg. My bad.
And yes, the crv does just that. It vents the second turbo air until the crossover.
But yes, you are correct. The crv goes on the aft leg. My bad.
And yes, the crv does just that. It vents the second turbo air until the crossover.
Last edited by cr-rex; Apr 18, 2015 at 12:42 PM.
10-8-10-8
Joined: Jan 2012
Posts: 848
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From: Australia
The CRV and ABV (whatever acronyms you want to use. I don't use acronyms. I think acronyms are *****) have different internal springs and diaphragms and different opening and closing pressures. That is why the part numbers are different. They should not be interchanged as they are not the same.
Just FYI.
Just FYI.
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Joined: Sep 2014
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The CRV and ABV (whatever acronyms you want to use. I don't use acronyms. I think acronyms are *****) have different internal springs and diaphragms and different opening and closing pressures. That is why the part numbers are different. They should not be interchanged as they are not the same.
Just FYI.
Just FYI.
Just checked mine. CRV is labeled N390 and is the one nearest the firewall on the Y-pipe off the secondary turbo. The ABV is labeled N3A1 and is nearest to the air cleaner. It does appear the N390 is where the ABV should be, but can't see the numbers on the other one to tell if they are switched or you have two of the same one.
You should also check your vacuum lines to make sure they are not wrong as well. The vacuum diagram will show where they should connect to
You should also check your vacuum lines to make sure they are not wrong as well. The vacuum diagram will show where they should connect to
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