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Discussion Starter #1
Hello i am on my second skyline and when there is a bov fitted to it it just stalls coming down from high revs! really annoying and makes ya look like a twat to say the least? do i have to get a idle speed controller or just ditch the bov? any help would be greatly appreciated? also whats tthe difference between a twin piston bov as mine is a cheap crappy one atm! thanks!
 

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Id stick with the original standard BOV what was your need to buy a new one? ive been told by verious mechanics AND RB specialist that the faxstan BOV is stronger then (dear i say it) alot/some A/market Dump valves

Itd be good to hear other peoples thorts on the original dump vales
 

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There's a few options if you don't want to revert back to the standard recirc valve:

There's the HKS EIDS (Electronic Idle Stabilizer) probably the cheapest solution but not that easy to come by.

Then there are the Apexi S-AFC2, AFC Neo and PowerFC which all have a function called Dec Air (deceleration air) which helps prevent stalling when coming down off the revs.

They're the only ones i'm familliar with so there could be more out there :)
 

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i was told only a re-map would sort it out BUT the dec air function looks good....where you you find that on the powerFC? can you use the hand controller to change it?
 

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No idea mate, I've only got the AFC Neo in at the mo, my Power FC's sitting under my bed :(

But yes it can be accessed from the hand controller
 

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I tried many bovs on the skyline. All made the car run too rich and jerk between gear changes. The stalling issue was present with all vta bovs I tried (HKS SSQV, GReddy Type RS, Blitz SuperSound) but I managed to keep the engine idling fine by using the Dec Air setting in the SAFC2.

My opinion, don't bother with vta's. Engine runs much smoother with the stock recirculating bov.
 

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there is a dec air function on the pfc but it needs plugging back into a laptop to adjust it if memory serves well - I think you can do it from the hand commander but it might not save the settings as I used to adjust ignition timing on my hand commander 1 or 2 degrees for a bit more power and it never saved it when I switched the car off

my vta bov runs fine with the neo adjusting dec air so if you get the settings sorted on your pfc it should be sorted out - get it to a tuner it wont take em more than an hour :)
 

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Just a thought - I had problems with my bov, instead of getting an adaptor and fitting it onto the original location on the original pipe, I had a custom pipe made up and had a flange welded on. Could perhaps restricted airflow through the custom pipe cause the stalling and juttering issues? How have you got yours fitted?
 

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my vta bov runs fine with the neo adjusting dec air so if you get the settings sorted on your pfc it should be sorted out - get it to a tuner it wont take em more than an hour :)
Just out of curiosity mate, what % have you got your Dec Air set to on your Neo? Is yours just the % Throttle that you've adjusted or the Neo1 and Neo2? I've got my % throttle one set at 3.6% but it's still giving me some issues after initially being ok :(
 

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THR POINT SETTINGS:

LO THR - 45%
HI THR - 50%


DEC AIR SETTINGS:

I've tried to display it below as I see it on my screen..


-------NEO1--------NEO2---
----------------------------
THR 500rpm 1000rpm
----------------------------
3.4% 5.5% 5.6%


it seems to not have any issue with stalling at all and thats with a blitz vta bov which are notorious for stalling apparently - it was doing it yday morning on the way to work, but that turned out to be exhaust blowing which I had swapped yday evening lol!!

note - these are the settings which were on the car when I bought it - I haven't chagned it since - i will say that it tends to idle a bit higher than usual on cold start but it doesn't cause any stalling issues no matter what so its a good trade off imho. The cold start is alot better since the new exhaust tho
 

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Discussion Starter #12
Thanks for all of the help i just got it cos im an idiot but am not going to bother now so into the fire it goes! was just jealous of why some cars could run it but im not goin to set my car up just for a noise! thanks for all the help!
 

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You and me both bud. People told me when i first got my Neo that if i had serious plans about performance then i should just save up for a PowerFC... Within a year... PowerFC! Good luck with the map too, i can't wait to get mine done.
 

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I'm taking the car down south tomorrow morning - 10 hour round trip and alot of it is in the london area which I dont like touching with a barge pole when it comes to driving down there but Ben @ eurospec is the only person I can trust to fit the map2ecu unit and tune it up. Basically if this doesn't fix the majority of the running issues I'm gonna be selling up on the car as I've replaced nearly everything in the last year and I just have a feeling its never gonna be enough. At least I can take comfort knowing that if I break the car I can sell soooooo many cool bits.
 
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