Does anyone use their safc to compensate for venting bov to atmosphere?

[gob4sho89]

I have herd that you can and was just woundering if anyone had first had experence with this and might be able to walk me through it. i am new to the safc so any tips on that would really help me out too. thanks.

 

[Quasimondo]

You've heard wrong. The dec-air feature only works with flapper type MAF's like what Nissan and Mazda use, not karmen sensors that DSM's have.

 

[gob4sho89]

do you think it would help? I tried venting the bov without anthing but a plug in the intake because i got bored over break. My car seemed to pull harder and hold more boost. My friends car is usually 1-2 car faster then me going 0-60 an now i beat him by a nose. no changes to his car. he said my car shot a few small flames just about 6-8inches out the exhaust right when i pushed in the clutch to shift. My car definatly is pulling harder right after shifts. This baffels me because i was expecting to be all boged down and supper rich after every shift. Is this just dumb luck, maybe compensating for something that was wrong before? I am so confused because what actually happened cotridicted everything i have ever herd about venting BOVs. Please dont say anything about ricer, because me and my friend and i were just curious to see what my 1g bov sounds like compared to his greedy one when vented to the atmosphere. If anyone could explane this to me, i might sleep better tonight...

 

[MrBoxx]

From the site founder:

2. Loud BOVs (the pssshhhhh sound between shifts)
The second most common question is, "how do I make my BOV louder?". Most of us DSMers will cringe when we hear this question. The fact is, a louder BOV on these cars will conflict with vehicle performance. In order to make a BOV loud, you have to vent to the atmosphere (as opposed to back into the intake, like our cars do from the factory), releasing the excess air instead of routing it back into your turbo system. The problem with this, is that your ECU has already accounted for this "excess air" and adjusts fuel curves accordingly. If it's not in the system anymore, the ECU is compensating incorrectly. This means that the car will not run the way it's supposed to. It may idle poorly, or it may not be noticable - but it will have a negative effect, even if you can't feel it (the logger will prove it). In any event, it is not the best thing to do if you are serious about making maximum performance. And if you are more interested in making your car sound "furious" and not making it "fast", expect a good deal of heckling, as this is a performance community.

From Quasimondo:

You cannot vent any car that has the BOV between the air sensor and the throttle body. This is because any air that the ecu has already measured will be lost when the BOV opens up, causing your engine to run rich between shifts, or any time the BOV opens. In other words, it has already measured for (x) air, but when you vent openly, it really has (x) minus whatever was blown out through the bov. It doesn't know that this air was already vented out, it's already calculated for enough fuel for (x) air, and now it has too much fuel and your car will stumble whenver you have to shift or come off the throttle. The problem isn't when you've come off the throttle during shifts, it's when you have to come back on it.

The only way to vent openly is to relocate the air sensor so that it is in between the BOV and the throttle body. None of the air that is vented when the BOV opens up will be measured by the air sensor so there will be no problem of running rich between shifts, etc.

Just for clarification, putting a stock 1g/2g MAF/MAS in the upper intercooler pipe is NOT the correct way to do it.

From oldman:

The effects of venting, just like fpr overrun, can not be tuned out.

That pretty much sums it up. To properly vent the BOV, you need a MAFt setup or some other air measuring system (MAP, speed density, etc) located downstream of the BOV. Regardless of AFC, DSMLink, or any other engine management/tuning tool that uses the stock air measuring set-up to count the air, venting your BOV will cause your car to run rich. You might not think it "feels" that way, but in reality, that's what's happening. It's made even worse when the BOV leaks air past the valve seat, producing a constant boost leak under all conditions.

Please recirculate your BOV if you care about the performance of your car.

 

[JayRolla]

That fireball is your car running really rich between shifts which is not good. Put it back the way it was, it can also make you back fire real bad. Also there is no way its making you have more power.

 

[KillerX]

now if you do want a bigger psst sound the "correct" way to do it would be to get a bov with a recirc hose on it, so its almost like your original one. I also have heard a hard UICP (upper inter cooler pipe) will make it harder as well but in all cases your still running it back into the system and not blowing into the atmosphere.
Hey I wont lie right now I have a Turbo XS SSQ blow of valve and when i give her its LOUD and SICK but my cars performance has gone down the toilet. I have troubles starting it sometimes and other times it will start fine. Sometimes my idle is crap and sometimes its good, lot of stalling etc. So I usually put my original on there and it runs fine.
Like a lot of people have said, if you want the correct way buy a MAFT but your looking around 250-350 and that money you could make your DSM a lot faster instead of having that sound and getting killed by civics

I hope this helps if ya need more help or Im not making sense (its late give me a break ) give me a pm and ill try to do my best to help

Brad

 

[Batman™]

I use a Turbosmart Dual Port. Vents to atmosphere AND plumb back. Works fine on my car.

 

[99gst_racer]

Please dont say anything about ricer, because me and my friend and i were just curious to see what my 1g bov sounds like compared to his greedy one when vented to the atmosphere.

You aren't a ricer, but you're concerned with BOV noises? O-K.

The Wisemen summed it up quite well. It's not possible to do what you're wanting to do. Run it recirculated.

Another BOV venting thread bites the dust.

 

[oldman]

Damn what I missed?

 

[leet]

This thread sucks.