i owned a sti a little while back and i wasnt allowed to put a bov on there because the MAF sensor was right before Bov and it didnt Adjust your A/F ratio inbetween shift, hense when u shifted u were running rich. at first it was cool id shoot flames everynow and then but then it started getting weird and almost stalling between shifts.

just wondering if the evo x has the same problem. im probably gonna get a cold air and go half recir and half vta, and get it tuned for it, im just wonderring if its gonna eff sh*t up latter on??

 

The evo x doesn't respond well to vta blow off valves. The stock valve works great so why change it? Theres like over 9000 threads on this.

 

No problems with the stock bov or hks ssqv I have installed now.

 

I would recommend keep the stock one especially if you are going with a cold air intake like the one AMS makes.

 

anyone know the symptom's of a evox wit a bov like what effects does it have on a car?

 

Found this on the web hope it helps:

Blowoff valves are used to prevent compressor surge. Compressor surge is a phenomenon that occurs when lifting off the throttle of a turbocharged car (with a non-existent or faulty bypass valve). When the throttle plate on a turbocharged engine closes, high pressure in the intake system has nowhere to go. It is forced to travel back to the turbocharger in the form of a pressure wave. This results in the wheel rapidly decreasing speed and stalling. The driver will notice a fluttering air sound. On a car equipped with a mass airflow sensor located prior to the blowoff valve, venting to atmosphere confuses the engine control unit (ECU) of the car. The ECU is told it has a specific amount of air in the intake system, and injects fuel accordingly. The amount of air released by the blowoff valve is not taken into consideration and the engine runs rich for a period of time. Typically this isn't a major issue, but sometimes it can lead to hesitation or stalling of the engine when the throttle is closed. This situation worsens with higher boost pressures. Eventually this can foul spark plugs and destroy the catalytic converter (when running rich, not all the fuel is properly burned in the cylinder which can allow unburned fuel to combust upon contact with and melt the converter or to cause incompletely combusted fuel to leave heavy carbon deposits).

 

^^^ yah i already knew that, its common knowledge but nicely written
just wondering if people with bov noticed any problems or any stalling or hesitation between shifts. or weird idle.
any problems pretty much?

 

I have the HKS BOV installed no problems with idle at all or leaking of any kind. I will be switching back to stock BOV when I get back and install my AMS cold air intake tho, simply easier and I have never heard any problems with stock BOV.

 

ROFL my body has a 4th Gen Trans Am with no BOV and crazy compressor surge on his 60-1 Turbo so not necessarily common knowledge my friend =)

 

buddy rather I'm a little slow =/

 

Says who?

My car runs just fine. I've been running the HKS SSQV VTA for many months...the car runs and drives like I picked it up brand new yesterday.

The Evo X isn't like other MAF metered cars since it also uses a MAP sensor.

 

tons of ppl on here have had issues as well as myself. perhaps you just got lucky as far as running vta.

 

Perhaps it wasn't the vented BOV causing issues.

Tons of people also run VTA without any issue, like me. I find it hard to believe that many Evos can run VTA without problems while many others apparently got "unlucky" with how their car runs.

 

^^^ totally agree there has to be an explanation if only half the people with bov's are noticing problems and the other half are driving around without a care.

what issue did u have ????

 

Its hard to get a direct answer on here sometimes - Scottspeed, you say you have the HSK ssqv with no problems, I see you also have an intake, and you say you have no problems - jmorris, you claim many people have had problems, which I've kind of read before, but I've only read on here they had problems with the HKS bov leaking and breaking, not messing up the runability of the car - - I ordered an ssqv, haven't received nor installed it yet, but would like a clear answer on whether it causes any problems to the CAR, and if so, what those problems were?