hey guys, Im really new still, but im trying.

Im pretty sure im having a problem with compressor surge and RPM drop coming to stoplights and such.

I have heard about the single spring mod for the Type S bov as mentioned here: https://www.evolutionm.net/forums/ev...lly-works.html but Im wondering if it will work for my RS?

Also, Im unsure on how to route the tube to my intake. The opening on my AEM intake is attached to something (i have no idea, clarification would be awesome), and also routed to a tube that feeds into my UICP, right under my Greddy BOV

????

take a look at these pics:

first one shows the unknown thing on my intake, with a piece that is broken circled in yellow. looks like a nipple for a hose that is gone.

second one shows the hose heading to the UICP

 

so what all do I need to make this recirculating??

 

That would be the stock diverter...

 

ok, cool. thanks for clarifying

Im about to order a recirc tip for my greddy, but im confused on what to do with both outlets from my UICP, since one is already routed to my AEM intake, right under the stock DV

 

Looks like the DV is on backwards. The bottom port needs to go to the UICP and side port to intake.

If it is in fact backward this is the reason for the surge your feeling

 

Thanks!!!

I just removed the inner spring on my greddy and man, what a difference!

But now I'm getting surging when Im just cruising at one speed/rpm with no boost.

 

Your whole thread makes no sense. You talk about a Greddy RS yet your pictures show your stock DV (installed backwards). You then say you removed the inner spring of the Greddy BOV but you never addressed the fact that it wasn't there to begin with. Not to mention, you should not have to remove any spring from the BOV as it is adjustable and the Evo runs plenty of boost to open it.

 

And what about my stock dv having the broken vacuum nipple?

I just took it out and rusty water spilled everywhere coming out of that broken hole

 

Sorry, this is confusing to me too, I did not set this car up. Here's the deal:

On my UICP, there are TWO outlets. One, where my greedy rs is mounted, the other has a hose that is routed to a (broken) stock DV, which is then routed to my aem intake.

I want to make this rigged setup into a recirculating one.

It looks as though whoever did this wanted to plug both the inlet to the aem and the second outlet from the UICP

 

Ok, I think I figured out what is going on.

My UICP piece has 2 outlets for some weird reason and the prev owner decided it was a good idea to flip the dv backwards and run it from the intake to the second UICP outlet to be able to "kill two birds with one stone"

Pretty mcgiverish.

But whatever, I may know what to do now. If only I could figure out why I'm having surging while cruising around...

Must be related to my erratic idle and my RPM drop in neutral. Ugh

 

Well this whole setup explains your compressor surge. Having 2 BOVs in line with each other is pretty crazy. The released air will not recirculate fast enough through both to not cause surge. If i were you, run the one greddy rs, and purchase a recirc fitting when you can. It's bad for the tune, but won't destroy the engine.

 

The second stock bov is just acting as a dual plug for both the UICP's second outlet and the recirc port on the aem.

How should I correctly plug this second UICP hole after I recirc the greddy?

Car runs more and more like crap. The RPM are now dropping extremely low (200-400) every time I release the throttle. I'm getting frustrated. Anyone in cincinnati work on evos?

 

Find someone that can weld it closed.

 

what the heck are you doing get all that extra junk outta there. The bov goes from upper intercooler pipe to the air intake. The vacume line has to be hooked up thats what makes the BOV open.

 

Thats a stock BOV hooked up backwards with no vacumn line hooked up.