Blow Off Valve Problems (Please Help!)

[Outrun Talon]

Two questions here so bear with me

1) I took the little recirculation hose off the stock BOV. You know, the really short curve hose that recirculates air from the stock BOV back into the air intake system about a foot before the turbo? When I did that, my poor Talon ran like crap. in 2nd and 3rd gear at about 3500 RPMs the stock BOV would just constantly dump air out (constant PSHHHHH sound) and the car itself would jerk back and forth (REALLY bad) as you drove it. Is this because it was gaining boost, then loosing it, then gaining it, then loosing it over and over without that recirculation hose? When I put the hose back on, everything worked brilliantly again. Took it off again, and the problem returned.

A) Why does the Talon apparently have to have the recirculation hose hooked up to run (well, run good). I was under the impression that all that hose did was recycle blow off air back into the intake, instead of just discharging it into the atmosphere.

B) If I have to have that hose, how the hell am I supposed to install the HKS BOV that I bought? The whole point of the HKS BOV was to dump air into the atmosphere and get a nice PSHHHH, not recirculate the air back into the air intake. I didn't pay several hundred bucks to get a HKS BOV that was going to do the exact same thing as the stock one!

C) When I took the recirc hose off, I did plug up the hole in the air intake were the recirc hose would usually fit. This way, it was't sucking un-metered air into the intake and turbo. Shouldn't I be able to just plug that hole up, take the recirc hose off, and get the stock BOV to give me a nice PSHHH? And later on install this HKS BOV without having to recirculate air back into the intake after I blow it off?



2) Anyone know were to get a 95 Eagle Talon BOV flange for my Universal HKS SSQV3, or should I just buy something like THIS (link)


Thank you in advance for the help guys, I sure need it!

 

[GsXdSmKingGsX]

Our cars run like crap without it. And its very bad for your car/turbo.

 

[Outrun Talon]

Our cars run like crap without it. And its very bad for your car/turbo.

Hmm, then how have people been able to put BOVs on their Talons? There are several videos on YouTube of people with HKS BOVs giving a nice PSHHHHH, and there cars seem to run fine.

When I took mine off, my Talon almost shook me out of the car, it was ridiculous.

 

[GsXdSmKingGsX]

Did you plug the hole on your intake tube after you removed it?

 

[DSMxJB]

Well, my car runs terrible with the stock bov vented but runs just fine with my HKS vented. You should be fine when you get your HKS to run vented though it is the improper way. That flange in you link works just fine,I use one. If you want to recirculate your HKS BOV they sell a recirculation fitting. Idk why but for some reason my car barely runs if I try to vent the stock BOV. I tried because I wanted to see how stock sounded vented but decided not to even drive it.

 

[Outrun Talon]

Did you plug the hole on your intake tube after you removed it?

C) When I took the recirc hose off, I did plug up the hole in the air intake were the recirc hose would usually fit. This way, it was't sucking un-metered air into the intake and turbo.

Yes.

Well, my car runs terrible with the stock bov vented but runs just fine with my HKS vented. You should be fine when you get your HKS to run vented though it is the improper way. That flange in you link works just fine,I use one. If you want to recirculate your HKS BOV they sell a recirculation fitting. Idk why but for some reason my car barely runs if I try to vent the stock BOV. I tried because I wanted to see how stock sounded vented but decided not to even drive it.

Sweet, I'll buy that flange and give it a go.

 

[Dustin269]

I was pretty sure the hks bov's came with an insert to resirculate did you buy it used?

 

[DSMxJB]

Do you have a aftermarket intake? That in itself will make the stock one louder, and if you recirculate the HKS it will not sound anything like the stock one sounds. Mine has the whistle when it's vented but when it's recirculated it has a flutter that sounds somewhat like compressor surge. and yeah, Idk why but for some reason the car barely runs if I try to vent the stock BOV.

I was pretty sure the hks bov's came with an insert to resirculate did you buy it used?

I had to buy a recirculation fitting but mine came with a flange.

 

[Outrun Talon]

I was pretty sure the hks bov's came with an insert to resirculate did you buy it used?

They do not come with a recirculation fitting. You have to buy it separately. The HKS SSQV3 universal BOV does not come with a flange either unless it is a cheap Chinese knock off, so I have to buy one of those too.

 

[DSMxJB]

They do not come with a recirculation fitting. You have to buy it separately. The HKS SSQV3 universal BOV does not come with a flange either unless it is a cheap Chinese knock off, so I have to buy one of those too.

Well mine is a legit HKS SSQV3 I bought a flange and then it came with one so I ended up with two.

 

[agarc023]

It'll continue to run bad dumping to the atmosphere until you have a way to change how the ecu "see's" the air. That would be through a GM maf with a translator (or ecmlink) or with speed density and ecmlink.

However it is good that you are replacing the stock bov because those are just plastic pieces of junk

 

[Outrun Talon]

Well mine is a legit HKS SSQV3 I bought a flange and then it came with one so I ended up with two.

Strange. According to the HKS website, if it comes with a flange it is a counterfeit (second image from the very bottom of that page). Maybe you bought a vehicle specific kit? Those come with a flange, but the universal SSQV3 does not come with a flange unless its a fake.

It'll continue to run bad dumping to the atmosphere until you have a way to change how the ecu "see's" the air.

Oh man don't say that. That sounds expensive and like its a PITA!

 

[DSMxJB]

Strange. According to the HKS website, if it comes with a flange it is a counterfeit (second image from the very bottom of that page). Maybe you bought a vehicle specific kit? Those come with a flange, but the universal SSQV3 does not come with a flange unless its a fake.

I forgot I did buy vehicle specific and that's a great link to tell fake and real.

 

[jtmcinder]

This is worse than the typical "my car runs like crap when vented to atmosphere" thread since this guy has a 2G. The 2G compressor bypass valve (which is one of the correct names for the thing) is known to not be able to hold much pressure and leak. So the OP is not only running rich on shifts, due to the venting, but is running rich all the time, due to the leaking.

For now, put the hose back on. When you can, get a new upper IC pipe with a 1G valve flange. Then get a slightly crushed 1G valve or the aftermarket valve of your choice.

 

[Outrun Talon]

I forgot I did buy vehicle specific and that's a great link to tell fake and real.

Ah, there you have it. Vehicle specific does come with a flange, therefore you sir have on legit HKS BOV

This is worse than the typical "my car runs like crap when vented to atmosphere" thread since this guy has a 2G. The 2G compressor bypass valve (which is one of the correct names for the thing) is known to not be able to hold much pressure and leak. So the OP is not only running rich on shifts, due to the venting, but is running rich all the time, due to the leaking.

For now, put the hose back on. When you can, get a new upper IC pipe with a 1G valve flange. Then get a slightly crushed 1G valve or the aftermarket valve of your choice.

Hmm, I'm running rich when I have the hose on or off? Just trying to understand you here . When I have the hose off, I have problems. When I have the hose on the BOV (or compressor bypass valve as you just tought me it works just fine. So it would appear the BOV only leaks when it has no recirculation hose on it, but that doesn't make any sense to me

Or maybe you are saying that my BOV leaks into that hose, sending extra air into my engine, which in turn runs rich to compensate for the extra air that's leaking out of the BOV and into the intake? Maybe I'm understanding you.

 

[DSMxJB]

Ah, there you have it. Vehicle specific does come with a flange, therefore you sir have on legit HKS BOV




Hmm, I'm running rich when I have the hose on or off? Just trying to understand you here . When I have the hose off, I have problems. When I have the hose on the BOV (or compressor bypass valve as you just tought me it works just fine. So it would appear the BOV only leaks when it has no recirculation hose on it, but that doesn't make any sense to me

You are running rich with the hose off. These cars don't like to be vented and will run rich in between shifts if they're not recirculated(vented) without speed density or a gm maf. You're car may have issues when it is vented and may not with the HKS people will argue about this. I recirculate because it is the proper way but my car drives/runs the same when it's vented with my HKS.

 

[04bls84]

Im thinking the difference between a stock BOV and an aftermarket is simple. Design is the difference, the stock is designed to do the job effectively with the stock setup and the aftermarket is designed to replace the stock, and when a person upgrades there system from stock the first thing they usually do is rice the car out by venting not recirculating. And then they realize they should have looked at the forums about venting vs recirculating the BOV. Anyway the reason the two act differently is because the stock setup and the aftermarket setup are different designs. One is designed to be recirculated and one is designed to be vented or both depending on the exact maker and type. And they will make your car run differently.

 

[DSMxJB]

Im thinking the difference between a stock BOV and an aftermarket is simple. Design is the difference, the stock is designed to do the job effectively with the stock setup and the aftermarket is designed to replace the stock, and when a person upgrades there system from stock the first thing they usually do is rice the car out by venting not recirculating. And then they realize they should have looked at the forums about venting vs recirculating the BOV. Anyway the reason the two act differently is because the stock setup and the aftermarket setup are different designs. One is designed to be recirculated and one is designed to be vented or both depending on the exact maker and type. And they will make your car run differently.

As I stated some people say it will and some say it won't. I'm sure a logger would show my car runs differently when it's vented but it idles the same and drives the same, it's not a noticeable difference at least on my car it's not. I've changed it back and fourth multiple times and have never had a issue either way. I ran it vented for a very long time because I thought the flutter from recirculation was compressor surge and didn't want to kill my turbo. I've read probably every vented vs recirculated thread on here and in every single one some people say it'll run fine and some say it won't. It will however fowl your plugs faster and hurt your gas mileage a little bit.

 

[Outrun Talon]

Im thinking the difference between a stock BOV and an aftermarket is simple. Design is the difference, the stock is designed to do the job effectively with the stock setup and the aftermarket is designed to replace the stock, and when a person upgrades there system from stock the first thing they usually do is rice the car out by venting not recirculating. And then they realize they should have looked at the forums about venting vs recirculating the BOV. Anyway the reason the two act differently is because the stock setup and the aftermarket setup are different designs. One is designed to be recirculated and one is designed to be vented or both depending on the exact maker and type. And they will make your car run differently.

The stock BOV is a cheap piece of plastic and it leaks terribly, a aftermarket HKS is made out of solid metal and is airtight. It's not a "design" difference as much as it is a quality and functionality difference. Going from leaky cheap-o plastic to solid steel is hardly "ricing" a car out.

As for spark plugs fouling quicker, that's nothing a nice set of NGKs can't fix!

 

[DSMxJB]

The stock BOV is a cheap piece of plastic and it leaks terribly, a aftermarket HKS is made out of solid metal and is airtight. It's not a "design" difference as much as it is a quality difference.

As for spark plugs fouling quicker, that's nothing a nice set of NGKs can't fix!

NGK's are good, they just get more build up since it's rich in between shifts.

 

[Calan]

I cannot believe that this topic is still discussed at all...much less to this extent.

A simple search on "BOV" will turn up literally hundreds of threads and thousands of posts on this subject, but jtmcinder said about all that needs to be said about it.

 

[hocka09]

Those stock bovs leak so damn bad. I simply went from one of those stock plastic ones to an uncrushed 1g and made up three psi of boost that the other one couldn't handle. I'm thinking since the whole system is not contained when you vent to atmosphere that the system is unable to pressurize nearly as much as it could if it was sealed up. Makes sense if other guys run bovs that hold WAY better than those junk plastic pieces, are able to vent to atmos with no problem. Just my two cents.

 

[04bls84]

Maybe it is a cheap piece of plastic but there are some basic design differences obviosly, Im not saying one is better than the other just they will be different unless they are exactly the same. Example: The same size, material, internal parts. They are not the same which means they are different designs, I am not recirculated either and my car idle surges right now for no reason but it ran fine before I left a moron retime my car at a garage. But anyway, I know plenty of people that will argue this till they die but as for me I will keep mine vented just because thats the way mine is designed to be.

 

[Outrun Talon]

Those stock bovs leak so damn bad. I simply went from one of those stock plastic ones to an uncrushed 1g and made up three psi of boost that the other one couldn't handle. I'm thinking since the whole system is not contained when you vent to atmosphere that the system is unable to pressurize nearly as much as it could if it was sealed up. Makes sense if other guys run bovs that hold WAY better than those junk plastic pieces, are able to vent to atmos with no problem. Just my two cents.

I'm thinking that you are right. I'm going to go ahead and install the HKS BOV I bought and see if my car acts up when that's on as opposed to the leaky stock one.

 

[rlacasse1]

I'm thinking that you are right. I'm going to go ahead and install the HKS BOV I bought and see if my car acts up when that's on as opposed to the leaky stock one.

It should be fine when driving, except for when you shift. When you shift you are going to lose metered air and the car is going to run rich for a bit. You may also have issues with it wanting to die on you when you shift because it'll get rich and bog out.