Engine Vacuum: What's Needed And What's Not?

[stangboy]

Hey guys I'm getting close to having the car running again and I need to know what vacuum lines are absolutely needed and what ones are not. I'm keeping the power brakes, a/c, and I'm doing MAF conversion. My mods are in my signature and here is the link to my build on the Talk side of this forum. Progress Thread - My First Notch build thread | Mustang Forums at StangNet

I also need to know where is the best spot to source the vacuum on the intake. I've seen it come from the side of the upper intake right before the TB and of course the usual spot under the upper intake....or do I need to use both locations. Also does anybody know if any parts stores sell those little plastic vacuum line that came on the car originally or should I use rubber lines?

Thanks in advance.

 

[madspeed]

need more info... what intake and do you have/need smog equipment?

 

[TOOLOW91]

need more info... what intake and do you have/need smog equipment?

What this guy said , My car has zero of that so i have booster, fp reg, the stuff to run the vents, the blower bypass valve , the boost ref sensor . and thats about it . Its all about how the car is setup i have no pcv so thats gone too ,no egr, no smog

 

[stangboy]

I have a Holley systemax intake, no smog. no EGR. I do still have PCV tho.

 

[liljoe07]

There is no port under the systemax like on the stock intake. All the vacuum ports are behind the throttle body. Mine has 3 ports on the back. One for the FPR, vacuum tree and PCV system.

 

[RangerJoe]

There is no port under the systemax like on the stock intake. All the vacuum ports are behind the throttle body. Mine has 3 ports on the back. One for the FPR, vacuum tree and PCV system.

Same here, with one additional from the valve cover filler neck to the throttle body.

Joe

 

[TOOLOW91]

Same here, with one additional from the valve cover filler neck to the throttle body.

Joe

Unless you are running boost then that's a no no !


Sent from my iPhone using my fingers while my auto correct makes me seem illiterate

 

[Mustang5L5]

Unless you are running boost then that's a no no !


Sent from my iPhone using my fingers while my auto correct makes me seem illiterate

But that's how the stock setup is.

 

[TOOLOW91]

But that's how the stock setup is.

correct but op is building a 363 I believe with the possibility of boost so I just wanted to throw it in there


Sent from my iPhone using my fingers while my auto correct makes me seem illiterate

 

[RangerJoe]

So just to clarify...you are saying NOT to run it this way IF you have boost?

Joe

 

[FoxMustangLvr]

So just to clarify...you are saying NOT to run it this way IF you have boost?

Joe

Correct, people typically use VC breathers to a catch can with PCV capped off when on the boost.

 

[FoxMustangLvr]

So what are people using to replace these vacuum lines? I'm in the same ball park with extending some and replacing others.

 

[liljoe07]

Correct. You can still use the line to the valve cover, but it needs to be relocated to part of the intake tract that doesn't see boost. If possible. And the throttle body port gets capped off.

If you leave it in the stock spot, you are doing nothing but building crank case pressure.

 

[TOOLOW91]

So what are people using to replace these vacuum lines? I'm in the same ball park with extending some and replacing others.

autozone has various sizes and t's by the roll


Sent from my iPhone using my fingers while my auto correct makes me seem illiterate

 

[stangboy]

Ok, I won't be boosted for a very long time. I will have nitrous before the end of the year tho. But as of right now I'm N/A. So is the line from the filler neck to the tb a no no for my setup? Should I just get a breather cap and cap off the little nipple on the filler neck and the one on the TB?

 

[TOOLOW91]

Ok, I won't be boosted for a very long time. I will have nitrous before the end of the year tho. But as of right now I'm N/A. So is the line from the filler neck to the tb a no no for my setup? Should I just get a breather cap and cap off the little nipple on the filler neck and the one on the TB?

if your not boosting it yet just leave it normal


Sent from my iPhone using my fingers while my auto correct makes me seem illiterate