| Need Blow Off Valve Help - Click HERE for Original Thread |
| Kyle2K |
I bought a single ARC BOV for my 91 GTR and it didnt work. i thought it was the valve itself so i sent it back and got 2 HKS bov's.
The new BOV's do not work either and i cannot figure out why! i found the vacuum line diagram in the manual i downloaded and i am quite confident the vacuum lines are hooked up properly but it still seems like all of the pressure is being released through the intakes.
oh, and the stock recirc valves are blocked off, as well as there is no problem with boost leaks or anything else that i can tell.
i will post pics in a bit, maybe they will help.
any and all help is appreciated! |
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| T-LAV MRV |
are they adjustable?, thats what pops into my head. also can u move the piston by hand?.
mike |
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| Kyle2K |
| i tried adjusting the ARC one when i had it, didnt help. I dont believe these ones are adjustable, pics will be up in a sec |
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| BJayne |
| They don't look adjustable but if they are turn the spring tension down and see what happens. If it doesn't work, take them off and see if the cylinder moves by hand, if it does then you know you have the vacuum lines hooked up wrong, or there is a leak somewhere. |
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| T-LAV MRV |
holy overkill batman, take one of those off, get the proper pipe, run only one, thats should help with the issue.
mike
edit, and run a vac line DIRECTLY off the intake manifold, not tee'd into something else which is tee'd into something else. give that a shot. |
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| Beerking |
quote:
Originally posted by T-LAV MRV
holy overkill batman, take one of those off, get the proper pipe, run only one, thats should help with the issue.
mike
edit, and run a vac line DIRECTLY off the intake manifold, not tee'd into something else which is tee'd into something else. give that a shot.
Agreed, you should try just running BOV vac lines directly from the manifold, not tee'd off from the FPR.
I have had weird luck with BOV's. My old BLitz SS would seize all the time, so I would have to take it apart and clean it. The I got the Greddy RS and for the first two days it did not open (stuck somehow), but eventually while running at high boost it just popped open. Check and see if you can push the piston manually, if not then it is probably stuck. |
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| RADRIDE |
Guys it also depends on the boost he is running. If he's running 8-10psi of boost he will pretty much hear fuck all. My supra at 26psi makes that HKS super sequential scream. But I am also running 1 bov not 2. Like someone said get rid of one, run a vacuum line off of the manifold specifically for the bov.
Also if they are adjustable then do the following. Start the car and let it warm up at idle. Start backing off the screw on the bov until you lose vacuum on your boost guage (your car will start idleing higher). That means you have gone too far and the spring is too loose. Tighten it 2 turns and you should be good to go. Good luck.
R.K. |
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| Beerking |
quote:
Originally posted by RADRIDE
Guys it also depends on the boost he is running. If he's running 8-10psi of boost he will pretty much hear fuck all. My supra at 26psi makes that HKS super sequential scream. But I am also running 1 bov not 2. Like someone said get rid of one, run a vacuum line off of the manifold specifically for the bov.
Also if they are adjustable then do the following. Start the car and let it warm up at idle. Start backing off the screw on the bov until you lose vacuum on your boost guage (your car will start idleing higher). That means you have gone too far and the spring is too loose. Tighten it 2 turns and you should be good to go. Good luck.
R.K.
I never really understood why some run 2 BOV's. RADRIDE if you are only running 1 BOV for that much boost and you have no problems, why are some running 2??
Also my Greddy goes off at 1 lbs of boost, its a little quieter but there is no flutter, and at 14 lbs it's fairly loud. I guess every engine is different. |
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| chris f |
it doesent matter how much boost you have, but how much air flow you have. A turbo pushing 80lbs at 20psi would need two blow off valves more then a turbo running 40lbs at 30psi. a blow off valves main fuction is to vent a volume of air out of the intake tract.
As stated, cut it down to one and hook it ho to the manifold, after the throttle body.
And 26psi is no that much boost. |
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| Destrukt |
quote:
Originally posted by chris f
it doesent matter how much boost you have, but how much air flow you have. A turbo pushing 80lbs at 20psi would need two blow off valves more then a turbo running 40lbs at 30psi. a blow off valves main fuction is to vent a volume of air out of the intake tract.
As stated, cut it down to one and hook it ho to the manifold, after the throttle body.
And 26psi is no that much boost.
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| Kyle2K |
thanks for the replies. i would try the single however those are both welded on there. Plus, fyi if you didnt know, my car comes stock with 2 recirc valves so i figured i would stick with that (i thought i ordered replacement bov's but this is what came, welded to the ic pipe). And as for adjustment i didnt see any screws but i will look again. also i will try a more direct vacuum line.
any ideas as to why the pressure seems like its being released through the intakes? |
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| tokes |
GTR's run individual throttle bodies. The throttle plates are just off the head, past the intake plenum. If you took a vacuum source like a traditional single throttle body car, your BOV's will not see vacuum untill the whole intake tract is under vacuum, which obviously is not happening untill all that boost escapes via your turbos.
Get your vacuum source off of the balance tube, and I think it should cure all your woes. The balance tube is a vacuum/boost reference that is behind the throttle plates, so as soon as they close they will send a vacuum signal to the BOV's |
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| Kyle2K |
| how would you suggest i do that tokes? should i go between the balanced tube and the pressure regulator? |
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| RADRIDE |
quote:
Originally posted by chris f
it doesent matter how much boost you have, but how much air flow you have. A turbo pushing 80lbs at 20psi would need two blow off valves more then a turbo running 40lbs at 30psi. a blow off valves main fuction is to vent a volume of air out of the intake tract.
As stated, cut it down to one and hook it ho to the manifold, after the throttle body.
And 26psi is no that much boost.
Okay back to the car in hand. Its got the stock twins still on it. I didn't see 2 gt42r's did you? Everyone knows its about how much air the turbos push. In his case if he is running low boost which equals low volume of air; he won't hear shit so thats why I told him to turn up the boost;) .
R.K. |
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| STiPWR |
| Or to stop being a ricer and put the stock recircs back on. |
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| RotaryJunkie13B |
quote:
Originally posted by STiPWR
Or to stop being a ricer and put the stock recircs back on.
there's no reason to run two bov's on stock boost/turbo |
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| Kyle2K |
quote:
Originally posted by STiPWR
Or to stop being a ricer and put the stock recircs back on
quote:
Originally posted by Kyle2K
my car comes stock with 2 recirc valves so i figured i would stick with that
it came with 2, and im a noob so i put 2 back on. i wouldnt call that rice, but thanks anyways |
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| tokes |
quote:
Originally posted by STiPWR
Or to stop being a ricer and put the stock recircs back on.
Holy shit, what makes it so rice that he has a pair of BOV's? It looks cool, why the hell do you even care? Yeah, if he was running dual exhaust I'd give him hell, but you're calling him a ricer for buying an off the shelf BOV kit? :confused: |
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| STiPWR |
quote:
Originally posted by tokes
Holy shit, what makes it so rice that he has a pair of BOV's? It looks cool, why the hell do you even care? Yeah, if he was running dual exhaust I'd give him hell, but you're calling him a ricer for buying an off the shelf BOV kit? :confused:
Keep your panties on. Its like I made a racist comment. Fucking relax. You ricer. |
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| Spoonin |
quote:
Originally posted by STiPWR
Keep your panties on. Its like I made a racist comment. Fucking relax. You ricer.
haha pwnt |
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| tokes |
quote:
Originally posted by STiPWR
Keep your panties on. Its like I made a racist comment. Fucking relax. You ricer.
I'm not exactly upset over it, just curious why you think it makes him a ricer.
It would probably cost more to sell off one BOV individually and need another IC pipe welded up to fit the single BOV than it would to just keep both :dunno: |
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| STiPWR |
quote:
Originally posted by tokes
I'm not exactly upset over it, just curious why you think it makes him a ricer.
It would probably cost more to sell off one BOV individually and need another IC pipe welded up to fit the single BOV than it would to just keep both :dunno:
We throw the term "ricer" around fairly loosely on these boards and at meets.
You are probably right, although I was making the comment on his post on how he wanted the "whoosh" sound. |
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| Hoozel |
| So i am running only 8 psi as well, when i let off the throttle when in boost it basically makes a Pulsing of air over and over again. Does mine need to be adjusted ? I tried to run a nice HKS BOV but we couldnt get it to fit.... fyi its a bike. shits a little tight under the tank. lol. |
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| Spoonin |
quote:
Originally posted by Hoozel
So i am running only 8 psi as well, when i let off the throttle when in boost it basically makes a Pulsing of air over and over again. Does mine need to be adjusted ? I tried to run a nice HKS BOV but we couldnt get it to fit.... fyi its a bike. shits a little tight under the tank. lol.
its called compessor surge....u are prolly getting it because u have no bov at all |
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| Hoozel |
| i think i would know i designed and built most of the system. yes it has a small BOV. I am just new to boost, and am unsure if it is a normal thing or not. |
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| Hoozel |
| its a Rotrex Blower, what i am wondering is if the valve isnt operating propperly. it seems to be fine on shifts, just when off the throttle it " flutters " i guess you could call it. |
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| RADRIDE |
The sound you are hearing is a BOV that doesn't have enough volume of air going through it to make a wooshing sound. I don't know what type of bov you are using but is there even a adjustment screw on it? If not then you might have to get a different bov that is used for low boost applications and the spring inside is weaker. The bov's mentioned here are used for big boost applications.
R.K. |
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| RADRIDE |
quote:
Originally posted by Spoonin
its called compessor surge....u are prolly getting it because u have no bov at all
I have never heard compressor surge on a supercharger before. Thats probably due to the fact that it runs off of a belt. But I could be wrong.
R.K. |
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| Spoonin |
quote:
Originally posted by RADRIDE
I have never heard compressor surge on a supercharger before. Thats probably due to the fact that it runs off of a belt. But I could be wrong.
R.K.
OHHHH its an SC.....nm than....im retarded |
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