BOV problems....

[AaronsSupraMKIII]

I was talking to Suprahero, and I seen on his video's that his BOV vents alot, and mine NEVER vents. He says that is bad on my turbo, so how do I fix it? Where should the BOV line be hooked to? Mine goes right under the pipe beside the 3000 pipe.

Any idea's as to whats wrong? I cant seem to get over 5 or 6 PSI also. Hope I haven't messed something up. :nono:

 

[Dunckel]

It looks to be hooked up right. Is it adjustable? Loosen the spring. And yes, it is bad on your turbo.

As for the boost issue, is your car an auto? Normal for an auto is 5.5psi iirc. What is your normal operating boost pressure?

 

[AaronsSupraMKIII]

How do I loosen the spring on it? I turned the nut on the end of it, but it just unscrewed from the bolt, there was no spring. I hope I didn't smoke my turbo.
Yes my car is an auto. I don't know what my normal is. The guy I bought it from had the EBC turned off, so it was really weak. I turned it back on and turned it up a bit, but it never gets over 5 or 6 max.

It looks to be hooked up right. Is it adjustable? Loosen the spring. And yes, it is bad on your turbo.

 

[88YotaTurbo]

Is that a broom stick? anyways That doesn't sound healthy for your car. Since you aren't boosting high I think you could be experiencing a boost leak at your bov. maybe you can adjust the screw to better hold the pressure until it has to vent. There is a spring inside the bov loosening the screw should tighten the spring internally keeping the bov shut during higher boost.
5-6 psi should have a very faint sounding blow off

 

[Dunckel]

You loosened the nut on top, correct? The thing that the nut is on, should have a place for an allen wrench to fit into. That is how you adjust it. Righty tighty, lefty loosey.

 

[AaronsSupraMKIII]

No it isn't a broomstick. It is a redneck hood prop.....OK it is a broomstick. :icon_razz I will look and see if it has somekind of adjustment. I am at work, but I parked up by the door tonight.

Is that a broom stick? anyways That doesn't sound healthy for your car. Since you aren't boosting high I think you could be experiencing a boost leak at your bov. maybe you can adjust the screw to better hold the pressure until it has to vent.

 

[88YotaTurbo]

all bov are different i guess. i have an hks it has no allen

 

[Dunckel]

yeah, some aren't adjustable, but his looks like my type-s. (kind of) Hopefully it is adjustable. It would be an easy fix.

 

[AaronsSupraMKIII]

all bov are different i guess. i have an hks it has no allen

Yeah mine is a Blitz, and there is no allen on it either. OOPS! It does have an allen! It is dark and I couldn't see very well...So It is adjustable. So I need to turn the set screw right to tighten it up, or loosen it so it will vent?

 

[88YotaTurbo]

you should be able to use the bolt on the top for adjustments. I believe yours is righty tighty lefty loosy . screw it in for tighten (hi boost) and out for loosen (lower boost). for the most part. don't get it confused with a wastegate, completely different.

 

[AaronsSupraMKIII]

you should be able to use the bolt on the top for adjustments. I believe yours is righty tighty lefty loosy . screw it in for tighten (hi boost) and out for loosen (lower boost). for the most part. don't get it confused with a wastegate, completely different.

Well that is whats confusing...It isn't venting now, so I would think that I would need to loosen it so it will vent, BUT if I loosen it, I will have less boost.
:aigo:

 

[88YotaTurbo]

no no no. like i told you. Don't get confused. The wastegate is responsible for the amount boost your engine make, for the most part (other variables matter too). Loosen the bolt until you have it venting and go another 1/2 turn out. That should be good for you.
I also think 5-6 psi shouldn't cause to much damage so i wouldn't worry about it.

 

[supramike7m]

no it wont have less boost. it just lets the bov, open to vent at lower boost. if you run low boost, and have the screw tight there is not enough pressure to open it up to vent. get it?

 

[AaronsSupraMKIII]

Oh OK...so if I rev the motor in park will the turbo spool, and the bov vent?
Or do you have to be driving it?

no no no. like i told you. Don't get confused. The wastegate is responsible for the amount boost your engine make, for the most part (other variables matter too). Loosen the bolt until you have it venting and go another 1/2 turn out. That should be good for you.
I also think 5-6 psi shouldn't cause to much damage so i wouldn't worry about it.

 

[supramike7m]

it should boost in park. just make sure the adjustment is loose, that way it will vent. when it doesnt vent it is bad, its called compressor surge. your are building boost while accelerating, but when you let off the throttle it shuts the throttle plate, now that extra pressure has to go somewhere (bov) if not it send the pressure back to your turbo, trying to turn the compressor the oppostite direction, while its already spinning one way.

 

[88YotaTurbo]

well i believe while driving cause you will not build boost without a load. and you are driving an auto right. so you will have to lift off the gas to vent.

 

[Dunckel]

If you don't loosen it, you will ruin your turbo quick, fast, and in a hurry. Don't loosen it so much that it leaks under boost. Here is the best I can do right now as far as how to adjust it.

I know it's different, but from the looks of your picture, the adjustment seems to be the same. The red lines are a poor attempt to look like an allen wrench. If the bov is new, it should have come with the correct wrench needed to adjust it.
The boost issue...http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?Section=TC&P=5 4.8-6.0psi is normal. You hooked up an MBC?? Did you hook it up right?

 

[AaronsSupraMKIII]

Yeah thats what Suprahero was explaining to me. I have been driving it this way for a few months. Hope I didnt mess up my Turbo...

Yeah Dunkel mine is the same as yours adjustment wise. I will try it in a little bit. I am fighting another problems right now too.. The damn thing wont start. The fuse panel under the hood, has a main fuse that is blown, and twisted together so it will start, and it wont start anymore........always something...lol

 

[88YotaTurbo]

i don't think so but keep them fingers crossed. you could always inspect the veins in the compressor wheel. Remover the accordion hose and look for mangled broken fins.

 

[supramike7m]

just try it while its in park, adjust it, give it some gas and let off. listen to your car, it should make a nice single swoosh of air. if it kinda echos then its surging. keep adjusting till you get it right.