lets dwelve into the boost solenoid

[clownhair]

so I was changin my oil recently and got to looking at the boost relief valve. Is that little hose going to that black valve the only thing venting our boost away from the car. If so how is it able to bleed 3 psi though a vaccuum line? Why would it not be possible to remove the valve totally? I mean it might throw an SES but it would work?

[Sp00ner]

Are you talking about the solenoid that opens the internal bypass valve? That's how it bleeds boost if I'm not mistaken. It's not through the hose, it's referenced off the hose. The bypass is internal, so it just starts opening the bypass a little as we get past 12 psi. Or am I talking about something different?

[clownhair]

Originally Posted by Sp00ner

Are you talking about the solenoid that opens the internal bypass valve? That's how it bleeds boost if I'm not mistaken. It's not through the hose, it's referenced off the hose. The bypass is internal, so it just starts opening the bypass a little as we get past 12 psi. Or am I talking about something different?

I'm going on 3 hours of sleep here so I'm trying to be coherent. Now let me remember what I saw under my hood. The vaccuum diagram had a hose coming from the intake manifolt to a solenoid and then to what it called a bypass valve (was external black round thing) and that went into the sc head unit. If it is something internal where is it internally? Is it in the sc? Where does it bleed it to?

[Sp00ner]

Yes, the bypass is internal to the supercharger. There's a great moving demo pic of it around here somewhere. There's a butterfly type of thing that lets the air skip the blower as it opens up. So instead of letting boost out of the car, it simply begins to open the valve more and more, so the air goes around the compressor. That's what happens when crusing on the highway. The valve opens and the air routes around the blades, creating a vacuum in the blower itself. That allows the blower blades to spin without air friction at part throttle.

[JPK]

I have that animated vid saved on my computer. Clownhair, you can PM me your email address and I'll send the vid to you if you'd like.

[SaturnI0Nredline]

Only if it was that easy! Some have tried the boost bypass mod but it not recomended. Look for the the boost bypass mod some where on this forum.

[clownhair]

Originally Posted by SaturnI0Nredline

Only if it was that easy! Some have tried the boost bypass mod but it not recomended. Look for the the boost bypass mod some where on this forum.

I know of that mod, tried it myself without success. What I am thinking of trying is disabling said butterfly valve. As soon as I get the vid from jpk I will examine it. People have disabled there TVIS butterfly valve on like toyota engines so maybe it can be done on this. I'm willing to try.

[Signals]

Originally Posted by clownhair

I know of that mod, tried it myself without success. What I am thinking of trying is disabling said butterfly valve.

That probably wouldn't be a good idea. The valve allows air to bypass the impellers inside the supercharger (no kidding, right?) The point is that, at low RPMs, the supercharger isn't spinning fast enough to be of any benefit. The impellers inside would actually restrict airflow and rob the engine of power.

Now, going the other way, getting more than 12 psi boost I think would require better fuel management (more fuel) through the injectors. So, I wouldn't try that one just yet.

[clownhair]

Originally Posted by Signals

That probably wouldn't be a good idea. The valve allows air to bypass the impellers inside the supercharger (no kidding, right?) The point is that, at low RPMs, the supercharger isn't spinning fast enough to be of any benefit. The impellers inside would actually restrict airflow and rob the engine of power.

Now, going the other way, getting more than 12 psi boost I think would require better fuel management (more fuel) through the injectors. So, I wouldn't try that one just yet.

Do we know for certain how big the injectors are? I'm gonna look into this and try and crack it.

[goofyguy]

first at 1000 rpms the engine make 2psi. <---- HEHE is all I can say the beauty of having a gauge I guess. second you will only get 2 more psi at redline if you bypass it. Third say good by to your milage becuase you are going to be forcing the supercharger to work 100% of the time which makes some crazy heat and noise.