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Old 12-07-2007, 02:04 AM   #1
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Default help with my friend's BOV

I dont think my friends BOV is working. He is running about 18lbs of boost. The BOV is a Tial with what he thinks is an 11lb spring in there.

Whether fully boosted or partially I havent heard the BOV while i was driving it. I simply here compressor surge.

Oh, and it is hooked up to a vacuum line on the top. I know alor of people dont run that.

Any tips would help he and I are noobs.

Thanks folks.
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Old 12-07-2007, 03:40 AM   #2
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Tell him to take it apart,clean it and lube the piston.
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Old 12-07-2007, 10:25 AM   #3
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it's also possible that you are hearing flutter rather than surge. might need adjustment (spring up/down)
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Old 12-07-2007, 10:30 AM   #4
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too tight.
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Old 12-07-2007, 12:24 PM   #5
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I run an 11psi spring and it blows off great at full boost. But in partial boost conditions it doesn't like to open fast enough and i hear some comp surge. I drilled and tapped my upper plenum for 1/8" NPT and the BOV has it's own dedicated vacuum line which is much bigger than what fits on that little baby nipple near the throttle body. That should be your first course of action.
I would take the BOV apart to make sure it's all in there straight and to verify the spring. If it's silver, it's the 11psi one.
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Old 12-07-2007, 12:29 PM   #6
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Thank you everyone.

I will check it out tonight.

I will reply back and let you know what happens..
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Old 12-07-2007, 12:33 PM   #7
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Ya know, after thinking I do hear a fluttery sound.

I am a noob, how do you adjust the pressure/spring up or down. I looked at the tial site and I dont see anything about adjustment..

Thanks
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Old 12-07-2007, 12:36 PM   #8
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There is no adjustment. You have to buy a weaker spring for $30.
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Old 12-07-2007, 01:38 PM   #9
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Ahhhhhh, Well then new spring time. Well after I check the rest of the BOV to make sure its legit..

Thanks bro
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Old 12-07-2007, 07:29 PM   #10
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I have seen the oring on the valve stick before. A light coating of lube helps. Makes sure the signal line is hooked to a port on the intake manifold at least as big as the fitting on the wastegate.
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Old 12-08-2007, 04:18 AM   #11
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BOV's....? who needs em

nothing beats the sound of boost banging around in the pipes, sounds cool when you shift too.

But seriously, a friend of mine has been running almost 20lbs of bost on his 18g setup for a few years,and over 60K miles. His turbo is holding up fine, and the increase throttle response is astounding. The lubrication on modern turbos allow for longer lifespan and more durability under abusive driving,

just a little food for thought

-dan
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Old 12-08-2007, 11:45 PM   #12
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I like food bro, I would just rather be safe than sorry. Thats all. The cool sound is the turbo saying "hey mother ******!!!!!" Ya know what I'm saying..

Anyway, I will be playing with this thing tomorrow to see whats up.

Thanks everyone!!
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Old 12-09-2007, 12:02 AM   #13
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Quote:
Originally Posted by dirtyboost View Post
BOV's....? who needs em

nothing beats the sound of boost banging around in the pipes, sounds cool when you shift too.

But seriously, a friend of mine has been running almost 20lbs of bost on his 18g setup for a few years,and over 60K miles. His turbo is holding up fine, and the increase throttle response is astounding. The lubrication on modern turbos allow for longer lifespan and more durability under abusive driving,

just a little food for thought

-dan
are you recommending running 20psi with no form of bov?
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Old 12-09-2007, 12:31 AM   #14
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His avatar should be applied to his advice.
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Old 12-09-2007, 12:47 AM   #15
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Quote:
Originally Posted by Mach929 View Post
are you recommending running 20psi with no form of bov?


i know of plenty of cars that run more than that with no bov. wrc cars for one, and ams road NASA road race car doesnt have one as well, i believe.

i drive my diy turbo 1.6 intercooled at 8 psi without one, no problems yet. Does wonders for the throttle response.
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Old 12-09-2007, 10:47 AM   #16
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it makes throttle response worse as you basically a forcing the turbo to stop spinning as all the air must go back out through the compressor. then you put it in the next gear and hit the gas you have to respool the turbo.
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Old 12-09-2007, 01:33 PM   #17
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Quote:
Originally Posted by dirtyboost View Post
i know of plenty of cars that run more than that with no bov. wrc cars for one, and ams road NASA road race car doesnt have one as well, i believe.
......and everyone of those cars have the engines and components checked and replaced/rebuilt after a race.
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Old 12-09-2007, 06:33 PM   #18
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Will cutting the spring reduce its rate???

Let me know. i will cut this bitch to soften it up
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Old 12-09-2007, 06:47 PM   #19
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I don't suggest cutting the spring. It's a specific length for a reason. Cutting it might be a ------ rigged way of lessening the pressure on the valve but you're not really reducing the springs rate. Cutting the spring might make it leak at idle, thats the last thing you want. Your spring is currently worth money. Buy the 9psi spring, sell the 11 on ebay.
Where are you getting vacuum from? If your vac source is too small, it won't blowoff right. The Tial is one huge *** piston. Give it the air it needs. Mine works fine with the 11psi spring and i'm only running 8psi of boost. Only times i have surge is when i get into less than 4psi.
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Old 12-09-2007, 09:11 PM   #20
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I am getting vacuum from the vacuum line right above/past the throttle body.

It is a smaller line. Should I maybe tap into the big *** vacuum line that goes to the break booster? That's the biggest on on my mani.

What one do you have it on? Do yuo have the stock size banjo/vacuum bolt on the Tial?

Thanks bro. I appreciate it.
OK I just uploaded this, so I can stop fukken around
is this vacuum too small and ****?
Name:  BOV.jpg
Views: 1
Size:  68.2 KB

Last edited by TURNS101; 12-09-2007 at 09:29 PM.
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