VDI question, how much pressure is too much?
06-11-04, 09:22 PM
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VDI question, how much pressure is too much?
Yo, I set up a custom VDI activation system involving pressurized air. the Valve will open fully at approximately 5500 RPM, but the way its setup is that the higher my RPM's are, the more air pressure there is going to be. So am I going to rupture the actuator or anything like that with too much pressure?
The way its setup is that there is a hose coming out of the airpump with a ball valve attatched to it. and i put a "T" coupler coming off the hose, with a line going to the VDI actuator. The excess air just vents off into the atmosphere. I had my girlfriend rev the car steadily to 5500 rpm, while i slowly closed the ball valve until the actuator moved the rod. I stoped now and the, until it was fully open, then i had her let off the gas. That's how i calibrated the VDI activation.
I got this idea from SonicRat BTW (thanks)
Anyway, i just wanted to know if there was a chance that id ruin the actuator/valve with too much pressure
The way its setup is that there is a hose coming out of the airpump with a ball valve attatched to it. and i put a "T" coupler coming off the hose, with a line going to the VDI actuator. The excess air just vents off into the atmosphere. I had my girlfriend rev the car steadily to 5500 rpm, while i slowly closed the ball valve until the actuator moved the rod. I stoped now and the, until it was fully open, then i had her let off the gas. That's how i calibrated the VDI activation.
I got this idea from SonicRat BTW (thanks)
Anyway, i just wanted to know if there was a chance that id ruin the actuator/valve with too much pressure
Last edited by DEZERTE; 06-11-04 at 09:27 PM.
06-12-04, 04:19 AM
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Originally posted by RotaryResurrection
I believe it is supposed to open with 3-5 psi (read the FSM!). Much more than that could possibly damage the diaphragm inside, so I wouldnt run a shitload of pressure to it.
I believe it is supposed to open with 3-5 psi (read the FSM!). Much more than that could possibly damage the diaphragm inside, so I wouldnt run a shitload of pressure to it.
thx for reply kevin
06-12-04, 05:39 AM
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Dude, just say it. You'll be using boost pressure from a supercharger.
The VDI actuator only needs 2.8psi to fully open, and like Kevin said, much more than that is likely to split the diaphram. What you need to do it put a tee in the actuator line with a little valve on the branch to act as an adjustable bleed that will lower the pressure seen by the actuator. If you keep it away from heat, a plastic tap used for irrigation systems should work okay.
The VDI actuator only needs 2.8psi to fully open, and like Kevin said, much more than that is likely to split the diaphram. What you need to do it put a tee in the actuator line with a little valve on the branch to act as an adjustable bleed that will lower the pressure seen by the actuator. If you keep it away from heat, a plastic tap used for irrigation systems should work okay.
06-12-04, 05:56 AM
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EDIT:
Originally posted by NZConvertible
What you need to do it put a tee in the actuator line with a little valve on the branch to act as an adjustable bleed that will lower the pressure seen by the actuator.
What you need to do it put a tee in the actuator line with a little valve on the branch to act as an adjustable bleed that will lower the pressure seen by the actuator.
06-12-04, 08:52 AM
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Which is what I told you to do! 
Basically you leave an open bleed so it can release the 'excess' pressure, I've been doing it for 10k+ miles without a hitch on both my aux & vdi.
Basically you leave an open bleed so it can release the 'excess' pressure, I've been doing it for 10k+ miles without a hitch on both my aux & vdi.
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06-12-04, 11:27 AM
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Originally posted by NZConvertible
Dude, just say it. You'll be using boost pressure from a supercharger.
Dude, just say it. You'll be using boost pressure from a supercharger.
ill go take pictures.
Last edited by DEZERTE; 06-12-04 at 11:33 AM.
06-12-04, 11:43 AM
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Originally posted by DEZERTE
wtf thats not what im doing, i just explained my setup. did you not read it?
ill go take pictures.
wtf thats not what im doing, i just explained my setup. did you not read it?
ill go take pictures.
06-12-04, 11:55 AM
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Originally posted by SonicRaT
I think he gets the idea that you're paranoid about popping it once you go with your supercharger, so you masked the question with the airpump instead.
I think he gets the idea that you're paranoid about popping it once you go with your supercharger, so you masked the question with the airpump instead.
Anywhere, here is my setup, I basically copied sonic for the most part
06-13-04, 04:54 AM
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Originally posted by DEZERTE
wtf thats not what im doing, i just explained my setup. did you not read it?
wtf thats not what im doing, i just explained my setup. did you not read it?
So why aren't you doing it the way I suggested? It seems pointless to have an airpump when the manifold is always going to be under positive pressure.
06-13-04, 07:38 AM
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Originally posted by NZConvertible
Apologies for the incorrect assumption. Since you've seen talking about the supercharger for so long, I figured this was the next step in your design. My bad.
So why aren't you doing it the way I suggested? It seems pointless to have an airpump when the manifold is always going to be under positive pressure.
Apologies for the incorrect assumption. Since you've seen talking about the supercharger for so long, I figured this was the next step in your design. My bad.
So why aren't you doing it the way I suggested? It seems pointless to have an airpump when the manifold is always going to be under positive pressure.
06-13-04, 11:01 AM
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Originally posted by NZConvertible
So why aren't you doing it the way I suggested? It seems pointless to have an airpump when the manifold is always going to be under positive pressure.
So why aren't you doing it the way I suggested? It seems pointless to have an airpump when the manifold is always going to be under positive pressure.
Originally posted by SonicRaT
Because he isn't putting the supercharger on for a while, so he wanted to make it function in the meantime.
Because he isn't putting the supercharger on for a while, so he wanted to make it function in the meantime.
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