Bov Too Crap For Boost?

[Lachlan33]

My car has some aftermarket (no idea what brand) atmo venting, problem causing blow off.

Apart from the usual stall issues one gets with such a thing (massive pain in the ass) I have recently had a SAFC installed along with upped boost. And pretty much from day 1 of the upgrade ive been getting weird ass issues.

Like sometimes it seems as if the BOV almost gets stuck open, if im just driving around on partial throttle I will notice a massive cut in power yet the pod sounds like its sucking in alot of air (or the bov is venting alot), a quick prod of the throttle sees the noise dissapear and my power instantly return.

The other issues is when under full throttle, my mid range is often interupted by a massive lack of power and a rapid popping noise form the exhaust, then when higher revs are reached the popping stops and its back on full power.

My thoughts were that the BOV isn't holding the boost for whatever reason, and the popping was fuel being dumped unburnt into the zorst than igniting, kind of like when you lift off and get a pop with an atmo BOV.

Oh and my clutch slips horribly in 4th and 5th gear under 80%+ throttle but thats to be expected with stock clutch and over 200rwkw (or so im told)

Anyway do people agree with my conclusion that the BOV is not handling the boost? Id turn down the boost but its been tuned to 11psi and its one of those 'wind it and test' bleed valve type controllers that I would prefer to leave alone.

[R31Nismoid]

Why dont you just put a plumbed BOV back on there? (read the stock or GTR one)

That would fix the stalling issue, and potentially if your BOV isnt holding the boost... also that aswell.

For $70 (stock BOV) - $200 (GTR BOV) at the most, its a pretty basic and cheap fix.

[r33cruiser]

Why dont you just put a plumbed BOV back on there? (read the stock or GTR one)

That would fix the stalling issue, and potentially if your BOV isnt holding the boost... also that aswell.

For $70 (stock BOV) - $200 (GTR BOV) at the most, its a pretty basic and cheap fix.

if u still want the pleasure of having an atmo bov. y dont u invest in a ssq bov. they operate with a push pull piston system. the advertisement states that it is almost impossible for them to 'leak'.

i personally have one on my r33, and have never had any stalling issues or other crap that people have stereoptyed with a vta bov.

good luck

[Gazee]

is it a new safc or safc 2?

the newer safc's have a feature that stops it from stalling when changing gears or slowing down etc, but really atmo bov's are just for attention, you can get the same thing (if not better) in a plumback.

or you can just mod your stock bov to stop leaking, theres a thread on here that shows you step by step what to do and it works...

if your not running big boost, you dont need another bov.

rip it off and put your stock one back on, economy will come back and it'll be headf*k free

[mad082]

the popping you are getting is probably due to your spark plugs and coils not being able to cope with the extra boost. how old are your spark plugs? what heat range and gap are they? the stalling caused by an atmo bov is made worse when your spark plugs are worn. i had the stalling issue on my stock bov cause my spark plugs were shot. try a new set of plugs and that should help with the popping up high in the revs, and may help a bit with the stalling.

i'd say your bov is probably also leaking. it may need the spring tension wound up a bit to stop it opening when driving at low load where it may be still under vacuum.

[Lachlan33]

Thanks for that guys.

I do plan to go back to the stock BOV, im trying to source one. I never wanted the atmo one, you get over the psssh pretty damn quick. The spark plugs making the issue worse might help to explain why the car didn't do it as bad when I first got it. With any luck the stock BOV, some new sparkies and a new clutch should have my car running sweet again. I haven't changed or even looked at the spark plugs since I bought the car over a year ago so it could be an issue