Forge splitter adjustment HELP PLEASE.

**.Mad Hatter.** · 05-20-2008 01:31 PM

Hey guys,

just got my splitter valve and Im about to install it. I need to know where I should have the adjustment set at. I spike at 17psi on my k03.

the valve has a total of 53 clicks, 0 being the weakest(low boost), 53 being the strongest(high boost).

I put it at 35, I figure thats about right...any input would be great guys.

**bob12312357** · 05-20-2008 04:21 PM

Hmm, I'm also curious on this one.

**.Mad Hatter.** · 05-20-2008 06:16 PM

Originally Posted by bob12312357

Hmm, I'm also curious on this one.

I think about 23-25 clicks from 0 is working for me now. it holds 17psi much longer that my core valve did.

**Squarrl** · 05-20-2008 06:46 PM

what controls the split then?

**.Mad Hatter.** · 05-20-2008 07:10 PM

Originally Posted by Squarrl

what controls the split then?

nothing, its a myth as far as i know.

the dial on the top adjusts the spring tension, if there is a way to adjust the split id love to know.

**baboom** · 05-20-2008 10:23 PM

hows it running?? ive heard some bad and some good about this valve.. hows the sound??

**AudiRacerS4** · 05-20-2008 10:50 PM

Originally Posted by baboom

hows it running?? ive heard some bad and some good about this valve.. hows the sound??

what bad things have you heard...

**Forge UK** · 05-21-2008 04:06 AM

Useful http://jonnyjetta.blogspot.com/

**.Mad Hatter.** · 05-21-2008 05:43 AM

no issues at all with it, it holds boost very well and sounds pretty good...i actually wish it was louder

**soundspeedstyle** · 05-05-2010 08:11 PM

just curious did you ever figure it out? I have been having an issue with setting mine also. In town it works perfect but on the highway i get a cel and then my boost gets limited like a boost leak. then after town driving it all goes back to good. Im down to 18lbs right now. any idea how many clicks i should go for?

**danphines** · 05-05-2010 08:16 PM

0 clicks for me. 23 pounds. the clicks change the spring tension which only changes the amount of sound you get out. i get the same boost at 53 clicks i get at 0 clicks. 23 pounds any way i do it. its just louder a 0 clicks.

**soundspeedstyle** · 05-05-2010 08:18 PM

there should be a guide somewhere to clicks vs boost. just to give a rough idea.

i haven't ever heard that... interesting. I will try that see if I still get a cel.

**soundspeedstyle** · 05-05-2010 08:46 PM

Originally Posted by danphines

0 clicks for me. 23 pounds. the clicks change the spring tension which only changes the amount of sound you get out. i get the same boost at 53 clicks i get at 0 clicks. 23 pounds any way i do it. its just louder a 0 clicks.
Re: Forge splitter vs forge 007p
i didnt like the stares from people i felt ricey every time i would shift. i like my car to be as quiet as possible. thats the only reason i still have my stock exhaust. i dont understand why people want their cars loud i dont want mine to be heard.

Did you change your mind? lol

I read after a ton of searching that 23-27 clicks is good for stage 1 a4

I am gonna try 0 first then go for 28 cuz i am a lil more than stage 1

**.Mad Hatter.** · 05-05-2010 09:05 PM

ya thats fishy...the spring tension is directly related to how much boost it will hold...i tested this.

turns out mine was leaking, i sold it to a guy on here or 4T. i went with a strat valve (again)

**fbdohc** · 05-05-2010 09:45 PM

Originally Posted by danphines

0 clicks for me. 23 pounds. the clicks change the spring tension which only changes the amount of sound you get out. i get the same boost at 53 clicks i get at 0 clicks. 23 pounds any way i do it. its just louder a 0 clicks.

Are you sure about that ?

**danphines** · 05-06-2010 09:27 AM

yep changed my mind about the sound got an exhaust on too but i have tried this on both my brothers gt28 and on my car. take your splitter out and hold it in your hand. put it at 0 clicks and push the piston up and look at the hold on the bov part of the splitter, it will completely open. now do the same thing but at 53 clicks. you will see that it wont completely open. this is what i have found with testing. it seems to have no impact on my boost levels whatsoever. i dont get any fluttering with it at 0, then again i have 0 vacuum leaks because i just redid all of the vacuum lines in the car. just take an hour and experiment with it thats what i did cause there is a pitiful amount of information on the splitter online about tuning it.

**fbdohc** · 05-06-2010 09:30 AM

Wow so what does the clicking is use for if it doesnt change anything for the boost ?

**danphines** · 05-06-2010 09:36 AM

I was under the impression that it changed the amount of boost you could run but now idk about that.

**twinturboaudi** · 05-07-2010 10:05 AM

how many clicks for each splitter valve (cause you have to run 2) should i have on a stage 2 B5 S4?

**BADRVCA** · 12-03-2012 03:42 PM

So 16 clicks will be good for a stock one ?

**walky_talky20** · 12-03-2012 04:06 PM

The main importance of the adjustment, in my opinion, is "charge pipe leak to atmosphere at idle".

At idle you have full vacuum to the splitter valve control port. If the valve is set too loosely (ie: 0 clicks), the piston will be open fully at idle. Due to the slight boost pressure in the charge pipe at idle, this will cause a loss of metered air. This creates a rich condition. I have noticed negative idle fuel trims of around 5% when the valve is "leaking at idle". Cold start and idle rpm is also a little rough. Tightening the valve will reduce or eliminate this issue. I have found that around 20+ clicks seems to be an appropriate adjustment, although it depends on several factors, so you'll need to find the right position yourself.

The valve will certainly be "open" at idle, you want that. You just don't want it to be significantly "open to atmosphere" at idle. You want to adjust it so the "psshhhh" port is at least mostly closed at idle.

**BADRVCA** · 12-03-2012 05:55 PM

Sweet... i dont know i just instaled a new n75 because i was runing with manual boost controller would be okay to have the bov set up at 20 clicks when im running stock n75 ?

**walky_talky20** · 12-03-2012 06:21 PM

Nothing will be harmed no matter where you set the valve. 0 or 50-something, the car will operate. Fuel trims/idle AFR will be more stable if you adjust it properly so it isn't creating a leak at idle.

The way you are controlling boost has nothing to do with it.

**c0r3y.af** · 12-04-2012 06:40 AM

Originally Posted by .Mad Hatter.

Hey guys,

just got my splitter valve and Im about to install it. I need to know where I should have the adjustment set at. I spike at 17psi on my k03.

the valve has a total of 53 clicks, 0 being the weakest(low boost), 53 being the strongest(high boost).

I put it at 35, I figure thats about right...any input would be great guys.

35 sounds too high. I would imagine that you need to be somewhere in the 15-25 range.

Originally Posted by Squarrl

what controls the split then?

Nothing. It's either full DV, full BOV, or split. You can't control the ratio.

Originally Posted by danphines

the clicks change the spring tension which only changes the amount of sound you get out.

This is incorrect.

Originally Posted by danphines

I was under the impression that it changed the amount of boost you could run but now idk about that.

Correct, sort of. It controls how much pressure is needed to fully open or close the valve.

Originally Posted by walky_talky20

Nothing will be harmed no matter where you set the valve. 0 or 50-something, the car will operate. Fuel trims/idle AFR will be more stable if you adjust it properly so it isn't creating a leak at idle.

The way you are controlling boost has nothing to do with it.

Correct.

**BADRVCA** · 12-04-2012 07:58 PM

So i havebmy splitter set up at 17 clicks but i dint have the "pshhh" sound its more like a shu shu shu like supras, more like a sequatial blow off valve now for what im reaing if u have it at 0 clicks u will get more of the pushhh sound ??? Correct me if im wrong

**BADRVCA** · 12-04-2012 08:04 PM

Im goin to try 10-15 see if it will make the pshh sound ,but so far im really happy with the new forge splitter bov

**walky_talky20** · 12-05-2012 06:42 AM

More clicks will open the valve less under vacuum. This does mean you will get less sound out of it, as the piston isn't opening the atmosphere port as much. Loosening it will getcha sum more "psshh", possibly at the expense of idle fuel trims and part throttle boost holding. There is a balance to had.

**.Mad Hatter.** · 12-05-2012 07:53 AM

This valve needs to die. 2 threads bumped from 3 years ago about it, ha.

**c0r3y.af** · 12-05-2012 07:56 AM

Originally Posted by .Mad Hatter.

This valve needs to die. 2 threads bumped from 3 years ago about it, ha.

Blame the users, not the valve

**.Mad Hatter.** · 12-05-2012 08:02 AM

I moved on to a Forge 004. I like that one much better :)

**M-Hood** · 12-05-2012 08:10 AM

Originally Posted by BADRVCA

So i havebmy splitter set up at 17 clicks but i dint have the "pshhh" sound its more like a shu shu shu like supras, more like a sequatial blow off valve now for what im reaing if u have it at 0 clicks u will get more of the pushhh sound ??? Correct me if im wrong

You might have it too tight based on how much vacuum your engine makes at idle, it sounds like you might be getting some compressor surge because the valve is not allowing enough pressure/air out of the system when it opens.