No recirc bov, now pushing lower boost??

[Cdaug720]

Hey guys! So I have been running a turbo xs bov on my 97 gst and it was recirculated into my intake pipe. I recently put a different intake pipe on and an HKS super sequential bov on so now it is not recirculating. When it was recirculating I was pushing 13psi and now I that it is not I am only pushing 9psi! The HKS bov came off of my buddie's 98 gst and he was pushing 13psi with it on and not recirculating. (Both cars are stock besides intake, exhaust, & bov) So I thought maybe if I drove around for a while and let my ecu adjust to not having it recirculated that it would go back to normal. I also tried unhooking my battery to reset my ecu but i have had no luck! I've driven about 100 miles give or take and nothing has changed, I am still stuck at 9psi! Any thoughts?

Thanks!
-Christian

 

[clipto]

Pre turbo leak is not ganna fly my man, find a way to recirulate it, or look into speed density.

 

[Cdaug720]

How come it would do this on mine and not on my friend's though?

 

[MY1GDSM]

Pre turbo leak is not ganna fly my man, find a way to recirulate it, or look into speed density.

While no that's not good... and would make them lean.

How are you figuring that is lowering the op's boost? and if you meant the BOV that is not Pre turbo...

OP just Do a Boost leak test to at least 20psi Recir the BOV somehow if you don't have the means to run a GM Maf or SD and call it a day... .

 

[Cdaug720]

I just don't see why mine is doing it and my friend's worked fine. But I hooked my recir pipe and bov back up to see and I was able to push 13psi again. And when I took it off and put the hks back on its back down to 9. I'll do a boost leak test here pretty soon. If all else fails I'll put my old one back one and recir it...I just love the way this sequential sounds..but I'll take an extra 4 psi over sounding good if I have to. I plan on running a GM maf somewhere down the road. I just got a new job so pretty soon here I'll have money to be doing things I want to my car

 

[tonyspyder]

op i know what you're saying. my first gst i had the hks bov dumping out without recirculating it too. weird. my first gst ran fine. no bogging or any hiccup. im still wondering how can this be too. my spyder as of now i have to get it recirculated. any ideas? i know forsure the evo doesn't need their bov recirculated. interesting.

 

[Doubleot]

That's off but not uncommon. Some cars (like mine) run just fine un recirculated. I never noticed a difference when I still had It dumping into the intake and now into the atmosphere. I would recommend doing a boost leak test and seeing if you are leaking from around the hks flange or snap ring. If not, find a recirc fitting and see if that helps any.


Also just to clear up some mis information in here, Evo's do recirculate in the intake.

 

[Abe'sGST]

^^^ I would do a boost leak test, chances are it is leaking around the HKS flange.

 

[Cdaug720]

I just barely put my old bov on and didn't recirc it to see if the bov was the problem, but I could only hit 9psi still. But when I put the other pipe on and recirc it I'll hit 13psi no problem...

 

[johnmel]

You probably got a leak some where with the hks I have the same bov you have and I'm at 16 psi no problem and it holds just fine. Also check the screw in the back if yours has it (I'm not sure if the newer ones do or not) sometimes the come lose and you'll have a little leak from that tighten it down alittle and see if that helps
also I think there's a myth about this whole non recirc/ circ just watch
Blow Off Valves Mythbusted - YouTube
Here's a pic of what I was talking about with the screw
http://autosportz.com/engine_mods/blow_off_valve_hks_diagram.jpg

 

[tonyspyder]

my friend drives an evo9 unrecir. all day and night no problem. yes of course all evo come from the factory recir. back to the intake but when they run after market bov they can choose to or not to recir. it back into the intake. another evo 10 from a performance shop runs it unrecir. too no problem daily driving too. everyone has their own 2 cents. im just throwing mines in. i talk to alot of shops and some say you can some say you cant. if it was his bov than it wouldnt work on his car either. bottom line is all motor arent the same. some will work some wont. again this is just my 2 cents. if you still want sound and a hks bov than try the hks v2. those doesnt have the adjuster bolt in the back and still will make the sound you want. just not as loud. even look into a by pass valve. good luck

 

[WES_393]

There is no opinion or myth about it. Our stock air metering system was designed to recirculate. Air is metered before it is compressed and the ECU calculates how much fuel to give. When you vent to atmosphere, you are blowing out air that has already been "counted". This also raises vacuum and draws in more air which tells the ECU to give even more fuel. What you end up with is the ECU giving too much fuel during shifting. Yes, some people will experience no noticeable effects. However, the engine is still runing rich while shifting. Without a blow-through MAF, SD, or a way to tune around it, it's best to recirculate. And those "car guys" (or whatever they call themselves) on youtube should not be taken seriously. They beleive air filters and exhaust pipes are "supporting mods".

With that said, if the BOV was leaking, it would make no difference whether it's recirculated or not. It would always be losing pressure. Are you going off the stock boost gauge? Are you plugging the stock recirc fitting when venting? If yes and no, then you are drawing in unmetered air and throwing off your airflow meter (aka stock boost gauge).

 

[TurboLaserRS]

You need to recirculate your blowoff valve, whether that means getting a new one or getting a 1g bov.
This subject has been beaten to a bloody pulp.

 

[Travisgsx96]

i actually bought the eclipse hks set up it came witht the flange for the stock hose and a fitting to recirculate it. i'm venting to atmosphere so im selling the other pieces. also did you check the o-ring that goes into the hks flange underneith the bov they like crack a lot.

 

[johnmel]

I was mainly referring to the tech guy but you are correct Wes. You should vent back unless you have it set up to where you can vent out

 

[Cdaug720]

Wes, i agree with you. If it was leaking then when I hook my other bov up it would be fine. But it's not. And I have a glowshift boost gauge that I am going off of. I have 2 different intake pipes, one set up for recir and the other one is not. I currently have the non recir pipe on and tried a few different bovs and I'm only hitting 9psi. But when I put my recir pipe on and recir my bov then I'll hit 13psi all day. I understand that I should be recirculating it, but I just do not understand why this worked fine for my friend and not for me. There has got to be a reason.

Another question, couldn't I just buy a boost controller and turn my boost back up? I mean, I know could, but I don't know if I should...

 

[MY1GDSM]

... .Have you done a boost leak test yet? Swapping parts like a BOV it's not a bad Idea to make sure your holding the same pressure after something like that.

 

[Cdaug720]

Thanks for all the input guys....but I no longer have that problem...I now have the problem of a huge hole in the side of my block and one in my hood where a rod decided to shoot out....so I'm not going to need that extra 4psi any more. My tranny also decided to blow out at the same time plus misc. damage from parts being shot around my engine bay. I'm just going to count my loses and move on. Hopefully will be buying a gsx in the near future.

 

[Abe'sGST]

Thanks for all the input guys....but I no longer have that problem...I now have the problem of a huge hole in the side of my block and one in my hood where a rod decided to shoot out....so I'm not going to need that extra 4psi any more. My tranny also decided to blow out at the same time plus misc. damage from parts being shot around my engine bay. I'm just going to count my loses and move on. Hopefully will be buying a gsx in the near future.

That really sucks man...How did this happen?

 

[Cdaug720]

Well I have cose to 160k on everything. I was just railing on it the other day and everything finally grenaded. But its ok, I'm going to buy a gsx soon. I've wanted one for a while

 

[ShadowTalon]

There is no opinion or myth about it. Our stock air metering system was designed to recirculate. Air is metered before it is compressed and the ECU calculates how much fuel to give. When you vent to atmosphere, you are blowing out air that has already been "counted". This also raises vacuum and draws in more air which tells the ECU to give even more fuel. What you end up with is the ECU giving too much fuel during shifting. Yes, some people will experience no noticeable effects. However, the engine is still runing rich while shifting. Without a blow-through MAF, SD, or a way to tune around it, it's best to recirculate. And those "car guys" (or whatever they call themselves) on youtube should not be taken seriously. They beleive air filters and exhaust pipes are "supporting mods".

This!
Some people won't have noticeable issues, others will. Point is our systems are designed for recirculation regardless of what the guy down the street is running. Evo's are NO DIFFERENT. I owned an 03 Evo VIII and happened to have an extra HKS BOV around that I put in for a few days. It was noticeable how the car ran and idled so I took it out, went back to recirc, and never looked back. Also, all that extra fuel being dumped eventually leads to fouled plugs, etc. This has been documented and spoken about for years.

Sorry you blew the motor up man but you can at least salvage some parts for your future GSX.

 

[95gsttsi]

I had mine at atmosphere never had a problem, although it ran a little rich. but i did notice it wouldnt hold boost like a diesel.. it would hit 12psi then drop down to around 8psi, so i assume it was leaking even with the vacuum delete.. only thing i ever did was play with the bov's hard and soft setting and most of it cleared up and i could keep boost between shifts.. some cars like it but some dont, i think it just depends on the set up tou have!

 

[fourgsixthree33]

This issue happened to me once when switching to an unrecirculated intake pipe. It was because the coupler on the intake pipe that clamps to the turbo would not work with the rubber insert piece that goes on the turbo.

My bet is you aren't getting a good clamp on the coupler that attached to the turbo.