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Thread: 1g bov hooked up overboost, take bov out only 7 psi?

  1. #1
    boostaholic
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    1g bov hooked up overboost, take bov out only 7 psi?

    I just redid all the vacuum lines on the car and installed a vacuum manifold and a 1g bov in the lower intercooler hose.

    The bov makes the right noise when you let off. When it starts to make boost the car makes some very odd growling/whistling noise in the intake. Never did this before the bov. When driven with the bov hooked up it over boosts and you get the wonderful code 45.

    If I just disconnect the bov then the car makes 7 psi and that's it.

    The wastegate vacuum line is hooked up t1 style so turbo nipple to a orifice (red) then to a tee, wastegate actuator then to the solenoid. I say this because the wastegate vacuum line has nothing to do with the bov or the vacuum manifold.

    I dont understand why the strange intake noises with the bov in the circuit and how the bov could be affecting boost if it has nothing to do with the vacuum manifold.

  2. #2
    turbo addict
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    Re: 1g bov hooked up overboost, take bov out only 7 psi?

    why is the WG line hooked up the way it is? Isn't this an 88 T2 car? Disconnecting the BOV will just let it leak open at 7psi so you're overspinning the turbo. Sounds like you need to put the lines back to stock. Run the BOV off the small nipple on the drivers side of the TB, the one that's capped off. You can see it here:


  3. #3
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    Re: 1g bov hooked up overboost, take bov out only 7 psi?

    hooked up the wastegate this way since its running a boost button cal.

    So the bov will blow off with nothing hooked up to it? That sux.

  4. #4
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    Re: 1g bov hooked up overboost, take bov out only 7 psi?

    Well that's normal and good. This isn't some ricer BOV. It has boost pressure to the top and bottom of the diaphram + pressure pushing on the puck itself. So to hold it closed there's boost pressure and spring pressure pushing the puck down. And then there's boost pressure on the bottom of the diaphram and puck trying to push it open. The boost pressure on top and spring pressure can over come the other pressures up to around 18psi to hold the valve closed. When you lift the pressure on top of the diaphram becomes vacuum and the pressure on the bottom of the diaphram spikes because it has it's boost reference from what's inside the IC pipes. This blows the BOV open quicker when you lift. But if you don't have that line hooked up up top then it just sees 0psi and the boost from the i/c lines that are pushing on the bottom of the diaphram and puck overcome the spring at 7psi.

    If you want to run more than 18psi you mod it like Gary D and Gus figured out years ago, that's basically to seal of that bottom boost reference port, and vent it to the outside air. At that point you can hook it up to a solenoid and a hobbs switch so that under 15psi it functions like stock with it's quick release and then above that turns into a high boost setup that will take as much boost as you can throw at it.

    http://www.thedodgegarage.com/turbo_bov_mod.html

  5. #5
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    Re: 1g bov hooked up overboost, take bov out only 7 psi?

    ok hooked it up to the second nipple. Sounds the same. Is the turbo supposed to whistle/growl at the transition from vacuum to boost? Still overboosting. Maybe back to the grainger...dont like the grainger though.

  6. #6
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    Re: 1g bov hooked up overboost, take bov out only 7 psi?

    The DSM bov shouldn't open until around 17 psi.

    Post some pictures of your setup.

  7. #7
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    Re: 1g bov hooked up overboost, take bov out only 7 psi?

    Whistle a bit yes, growl, probably not but hard to say over the internet with no video. I could never get the boost button boost control to work with my or a friends setup. What's not to like about the grainger??? Boost matches foot position. Hard to argue with that.

  8. #8
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    Re: 1g bov hooked up overboost, take bov out only 7 psi?

    Grainger does not have the drivability of computer controlled boost. To me at least.

    This is the bov location


    Vacuum manifold
    "]<a href="http://s1191.photobucket.com/user/frankjhunt/media/vacuum.jpg.html" target="_blank"><img src="http://i1191.photobucket.com/albums/z474/frankjhunt/vacuum.jpg" border="0" alt=" photo vacuum.jpg"/></a>[/URL]

    Wastegate solenoid


    Manifold hookup

  9. #9
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    Re: 1g bov hooked up overboost, take bov out only 7 psi?

    with it mounted in the lower hose it can make some interesting noises at part throttle. Take the filter off, cap it so the BOV can't vent and see if the noises go away. The noises probably aren't hurting anything, it's just something I've noticed when they're in the lower hose. I like them.

    I tried both 88 and 89 orifices and different nipples on the WG solenoid trying to get the BB control to work. Never did, though this was probably 5 years ago. Then 3 years ago with a friends 89 Turbo Mini. Both run the grainger now. I can tweak the boost curves on a stock bin just fine and they work. It's cool having the boost set at 14.5psi with no cut out. I cranked the curves to give me more grainger like capabilities unless it was cold or detonating which was nice since I didn't have to be so conscious of what my foot was doing. As far as drivability with stock curves I don't like it, it's a dog until you're floored which I don't want to have to do all the time.

  10. #10
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    Re: 1g bov hooked up overboost, take bov out only 7 psi?

    so you use the stock bin file and tweak the wastegate curve to your liking? Can you tweak the stock bin for bigger injectors and 3 bar?

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