I have a GReddy type-RS BOV. i have been told that installing this can throw codes and also clog up my cat, but i have also read that aftermarket bovs can be an essential upgrade without it mentioning any problems. When changing from the stock to aftermarket what do i need to change if anything for the install?

 

as long as u recirculate it u shoudl be fine

 

What do you mean by recirculate it?

 

Means vent it back into the intake pipe behind the AFM. You can't vent it to the atmosphere because it will suck air after the AFM, which the AFM will sense and tell the computer that airflow has seriously decreased, which will cause all sorts of driveability problems. So if you bought it for sound, you kinda hosed.

 

So i can't use an atmoshperic bov at all?

 

daily driven atomspheric vented Apexi bov for 4 years now...

If you have a S4 then the ecu won't care.

The reason why people say recirculate it, Is because that is metered air that the ecu has already planned for. It will inject the fuel for that air. So if you go atmo then you will be rich for a split second when you shift or dump air.

The ony way I could see it "clogging the cat" is via these rich situations and over a long time.

I like fireballs and don't run cats so I don't care

 

ok im not 100% on how to change it from stock to the aftermarktet, would anyone be able to provide me with some hosing diagrams or something?

 

Murphy's law kicked in and the BOV failed this weekend. It gets stuck in the open position after a good 8-10psi.

 

i agree, you gotta run really rich for a long time to plug a cat. do the smart thing and take it out, i gained 2 lbs of boost when i did

 

I corrected the statement above..

The proper way to vent to atmosphere is to delete the AFM. Of course doing so requires the use of a standalone type EMS. You can still run one vented to atmosphere, but expect decreased catalytic converter life, some backfiring, and worst case scenario boggy throttle response between shifts.

Your call.

 

I've had no problems with my Greddy type RS. Plug the hole in the intake snorkle where the stock bov vented to with a large bolt and hose clamp it so you have no vacuum leak.

 

Mine was a kit. http://www.velocityfactor.net/prodim...SBOVRX7500.jpg You have to have the charge pipe with the greddy adapter or have an adapter welded on your stock charge pipe.

 

Have you actually run a vented BOV? I have run a vented modified stock BOV and have had my Blitz SS for about a year now and it has run perfect the whole time with zero backfiring and absolutely no boggy shifting. If your emissions system is working fine then why would it decrease cat life? 7's already run pig rich.

To the OP if you look at how the stock BOV is hooked up then it should make pretty good sense as to how to hook up the new one. If you don't have a TID then you will need to plug a few holes but it's easy.

 

Thanks for the last few responses, but I figured it all out back in 08'.. never did experience boggy shifting while I ran it..

 

LOL I never looked at the original thread date.

 

just recently purchased a 19mm adapter from Greddy in Irvine, CA since i was in the area last weekend. finally recirculated my Greddy Type S BOV to my aftermarket TID. feels good man.