BlouZbee

iTrader: (7)

hello everyone,

heres the story....wasnt boosting correctly so i started troubleshooting....installed efini y-pipe, checked IC piping and couplers, replaced all 4 check valves with Dales, replaced CRV, broke a solenoid nipple so went in after it to replace.... turned that into a vac hose job.... replaced 70 lines.... tested every solenoid in rats nest plus the 2 that attach to the UIM. road test in 3rd showed 11-9-11, felt great i was stunned by the power, looked down and i was doing 110..WOW.

i am still unsure of boost in 1st and 2nd, it seems i only get boost if i really mash the pedal. so anyway i decide to vent the BOV to the air just hear it... well it makes noise under acceleration in first and second, it only doesnt vent if im really on the pedal.

1)is this normal?

2)can someone explain what i should be seeing in first and second?

thank you.

wjp005

iTrader: (3)

You shouldn't hear squat out of the BOV until you are off throttle.

Sounds like it isn't closing properly, in which case you will be loosing boost through it.

I would take both of them off and test them. (see if you can pass air through them)

dgeesaman

iTrader: (7)

It's normal not to get full boost in 1st or 2nd until you really mash it.

The BOV should not vent when boost is above 0psi.

Dave

CantGoStraight

I'm guessing your hearing the CRV, not the BOV. One way I've found to verify there working correctly is to place a small section of garden hose in the end of the BOV or CRV (depending on which your troubleshooting) and run it back under the hood on the passenger side and into the passenger window. While driving you should hear no air out of the BOV until you get out of the throttle (any gear any rpm that has spooled the turbos) and if your testing the CRV you will hear air all the time until about 4500 rpm (transition) then it should close completely with no air sound. Not very high tech. but quite effective as it can tell you exactly when your CRV closes (you'll see boost build instantly on the gauge) and it will help you find a lazy transition and basically help confirm proper boost Just a thought as this has been useful for me.

BlouZbee

iTrader: (7)

by what u guys are saying it sounds like my system is working correctly because under normal acceleration im under 0 psi in 1st and 2nd so it is venting partial(sound is annoying). ill have to do some more testing to confirm. thanks for the feed back.

do aftermarket BOV vent like that? all the time if not boosting?

BlouZbee

iTrader: (7)

its the BOV because i hear nothing until i vent it to the air, the forward most air bypass valve

CantGoStraight

BOV should only vent under vacuum (letting of the gas) if your on the gas and you hear air it's your CRV (or you have a boost leak)

BlouZbee

iTrader: (7)

im am SURE im not hearing the CRV, a) its vented into the air box, b) i hear nothing UNTIL i vent the BOV to the air.

i can accelerate through 1st and not make boost, so the BOV is venting though the entire gear(i can hear it when vented to the air). that is what i am guestioning at this point. it does close when i boost, but under normal driving im not always boosting in 1st and 2nd so i hear venting the ENTIRE time until i mash the pedal. 1st doesnt seem to boost unless i WOT or close to it so i hear venting through the whole gear and most of second is the same. should the BOV vent like that?

my CRV is brand new BTW. i get 11-9-11 in 3rd. these lower gears are confusing me.

gracer7-rx7

iTrader: (16)

I experience what sounds like the same issue at part throttle and lower gears. I just tested both my CRV and ABV and both are fine. When I get on it WOT, I don't hear that venting. When I'm on it part throttle with some boost, I do hear some venting also.

Yes it is kind of annoying hearing that all the time. Yes an aftermarket BOV will not make that noise at part throttle like you and I are seeing. I used to have one and might get another one some day to get rid of this contstant sighing of the BOV at part throttle.

Good luck.

BlouZbee

iTrader: (7)

well at least im not alone

id like to hear the venting characteristics of the stock BOV in low gears/partial throttle from other users that have it vented to the atmoshere.

as cantgostraight said i think we would hear it less.

anyone else chim in?

Upgrayedd

iTrader: (1)

Mine was vented into the atmosphere for a while and it would never vent unless it was under vacuum. I still have the CRV hooked up and my HKS BOV in my FMIC piping and the CRV will vent at some throttle points while in primary boost. My solution would be upgrade your bov. I get 8psi in 1st and a full 14 psi in 2nd. Was it having the same problem with boost patterns when it was recirculated into your intake?

BlouZbee

iTrader: (7)

the boost pattern doesnt change wether its vented into the atmosphere or the airbox. i only noticed it because i vented it to the air and could hear it acting the way it is and wasnt sure if its normal. im starting to think its not.

it DOES test good according to the FSM.

BlouZbee

iTrader: (7)

is that at WOT?

Upgrayedd

iTrader: (1)

Correct. I have a boost controller set at 14psi and in 1st I get 8 psi and 2nd-5th I get 14psi. Before the boost controller I would see 5 or 6 psi in 1st and 10psi in 2nd-5th

schwass

hey as far as i know the factory bov sucks in under vacuume, hence why it is connected to the air box, so if your just cruiseing along and the car is under vacuume the noise will be it sucking in, best to either connect it back to the air box so as not to suck any forign objects in, or replace it with an after market one, i did exactly the same thing with my s6

Mark

mergatroyd

I also am having boost issues. I bought a jdm motor online, and it boosts strange. I have apexi intakes, downpipe, 3 inch cat, and what appears to be an apexi n1 exhaust. 40-60 is about 5-7 lbs depending on the grade. 60-80 is instantaneous at 15-18 depending on the grade and what else has been going on. the transition is essentially instantaneous, and I suspect it boosts more than that when I'm passing (I kind of like to keep it on the road). The transition happens at 4500~ rpm, but usually I am really busy aiming it at that point.

is there a fuel cut at 20 lbs that I don't know about, or was that me trying to break an apex seal?

Upgrayedd

iTrader: (1)

It's a one way valve. It only releases air pressure. The hose going to the airbox is a recirculation hose. The released air just goes right back into the motor via the intake.

Upgrayedd

iTrader: (1)

What's controlling your boost? Are you on stock turbos? The break up at 20 psi could be no more fuel, no more spark, etc...

cld1000

What ecu are you running, are those your only mods? if your hitting that kind of boost with only those mods and stock twins you may have something going very wrong, and may on your way to kissing that motor goodbye. just my thoughts

cesarx7

iTrader: (1)

I had the same exact problem when I first purchased my FD. I would hear the BOV leaking while accelerating at lower speeds, unless I had it at WOT. But I couldn't tell if it was leaking boost in 3rd, 4th, and 5th gear because the exhaust was too loud. I assumed that it was, so I replaced the BOV with an aftermarket one... problem solved...

dgeesaman

iTrader: (7)

Reference page F-77 of the FSM. The bov will vent partially at just a few inches of vacuum, and vent fully by 9inHg. So as you accelerate, unless you're above 0psi boost, it will be venting.

If you have your stock bov disconnected from the intake and don't like when it's making noise, plug it back in. Installing an aftermarket bov will not fix anything - it will only change the sound. It does remind me though to mention that aftermarket bov's are adjustable, and that you should adjust one to crack at 0psi, or else you'll be putting a lot more load on the turbos and raising your intake temps unnecessarily.

Dave

cesarx7

iTrader: (1)

I can't speak for the OP, but MY stock BOV was indeed venting/leaking well past 0psi under steady, moderate acceleration. Also, the sound it made was that of a steady release, rather than just a quick one (while boosting, above 0psi). So it sounded a lot more like a small, constant leak than the usual "vent". I replaced my stock BOV for the sole purpose of fixing this problem, not to change the sound.

BlouZbee

iTrader: (7)

If my BOV is working correctly then i cant understand why anyone would ever vent it to the atmosphere because it makes the car sound as if it was broken. it will vent all the way through first to the redline if im not boosting.

i need to test again to confirm exactly when it closes.

mergatroyd

Stock ecu AFAIK. I removed the pressure tanks (hooked the vacuum lines directly to the rat's nest for the top one, plugged the one that hides behind the power steering pump). Aluminum intercooler piping for the stock intercooler. Air pump is disconnected. Efini y-pipe with the secondary turbo piece coming from the jdm, the rest off the overheated one. I don't remember which motor the CRV and BOV came off of. Underdrive pulleys for e-shaft and waterpump. JDM wiring harness with the blue connector that doesn't match US spec matched as far as wire colors with one left out (the only one that didn't match, brown and something, I will check tomorrow)

As far as I can remember at the moment, that is all I have done. I am being careful now that I saw that not to boost that much.