stupid simple basic question...

[psmvchaser]

But I have to educate myself on this:

Is the vacuum system one long continuous system coming from manifold pressure?

I am trying to figure out if you would get the same vacuum if you spliced into the map sensor line or the fpr line or one of the manifold lines....

I know this is probably basic engine knowledge, but I need to know.

 

[Lynn D. Brown]

Re: stupid simple basic question...

Some of the vac lines will read only vacuum, not boost, and these lines have a check valve in the line, which won't let positive pressure thru. Ones w/o the check valve will show negative pressure (vacuum) or positive (boost). The MAP and AFPR will show either. The vac canister, cruise (Ithink) and brake booster will only see vacuum.

 

[psmvchaser]

Re: stupid simple basic question...

OK....one more thing. Where/how does the port on the compressor housing tie in?

I'm having major trouble for the second time with a brand new boost controller, so I'm trying to figure out if everything is hooked up right and getting the right readings.

According to the manufacturer, I have it right, but it still doesn't work.

 

[SeattleSy#1255]

Re: stupid simple basic question...

www.sytyauthority.net

has diagrams of the vacuum system, including the boost selenoid. It is down at the moment, but look under "tips"...tons of great info.

HTH

 

[mmp142965]

Re: stupid simple basic question...

OK....one more thing. Where/how does the port on the compressor housing tie in?

this port is its own source of vacuum, separate from manifold vacuum. Readings will be similar under boost conditions, with a difference only in the pressure drop from the intercooler and plumbing. Since this source is derived from the turbo it is suited for a boost controller/ wastegate, but nothing else.