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Forced Induction Forum
Discuss supercharging, turbocharging and even nitrous and water injection here.

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Old 03-07-2016, 06:10 PM   #1
Pole position
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What to do with Vacuum Lines When boosted? A/C?

What do you guys do with your vacuum lines when Boosted?

For example:
A fuel regulator increases pressure as vacuum increases. With boost wont it flow less? Do you just run the vent to atmosphere instead so it stays constant?

What about the vacuum lines that go to the stock F-Connector on the intake boot?

The brake Booster?

I have a front mount intercooler kit and am not sure what to do with my vacuum setup. I rather have it all planned out before I dig in. I found this website, http://www.e46turbo330ci.com/?page_id=752 , but I'm not sure the car ever got finished so I don't want to go on that without checking. Attached to a post a diagram that guy created.

It also just doesn't seem feasible or correct. I currently am running a catch can with a pcv valve in-line. How do you guys plumb your systems including wastegate, boost controller, BOV, and stock features?

On another note, is there a way to relocate the A/C components? I see the hard pipes that come out by the passenger side of the radiator are right in the way of my top-mount manifold.
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Old 03-08-2016, 04:41 AM   #2
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I think the diagramm would work, I don't see a big mistake on it.

But you don't need the check valve in the fpr line. The fpr will raise the fuel pressure when manifold pressure raises. This line is to hold the fuel pressure at a constant level above the manifold pressure. So the flow through the injectors will be constant at the specified value.

Also if you don't care about emissions you can vent the catch can into free air.
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Old 03-08-2016, 05:32 AM   #3
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Are we 100% shure that the pressure regulator on the fuel filter does work with manifoldpressure? From what i´ve read it doesn´t.
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Old 03-08-2016, 07:04 AM   #4
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Hmm yes, you are right on the original setup it is connected between MAF and throttlebody. Don't ask me why

But with FI it works with manifold pressure.
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Old 03-08-2016, 07:35 AM   #5
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What to do with Vacuum Lines When boosted? A/C?

Do I need those tiny check valves everywhere?

Will I run into pressure issues if I continue to run a closed system catch can (no vent to atmosphere)? I have it so it creates vacuum, which I thought was good.

I will call the fpr company to ask about the pressure. I do not think a check valve should be there though. Just did some more searching and it turned up some things I didn't see before. Fpr works with both boost and vacuum, basically zeroing out the pressure the injector outlet is "feeling". In short, the fpr needs a direct link to the manifold pressure, whether it be negative or positive.

My intake setup is different. Maf right before intake, and bov right before it.

Is the fuel tank breather valve already a "check" valve?
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Old 03-08-2016, 11:38 AM   #6
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What to do with Vacuum Lines When boosted? A/C?

Possibly a suitable vacuum blocks-
https://www.ebay.com/ulk/itm/262232339011

https://www.ebay.com/ulk/itm/251074676801

Need to go through the system and find all the hose sizes.
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Old 03-08-2016, 05:16 PM   #7
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Does anyone who is already boosted have an opinion on this? Id like to hear back from someone whos actually done it!
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Old 03-08-2016, 05:49 PM   #8
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Agreed! Thanks
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Old 03-08-2016, 07:31 PM   #9
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Check valves typically go things that only use vacuum. Check the directions to any supercharger kit and you'll see all the places they should
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Old 03-09-2016, 11:14 AM   #10
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Just read through the AA supercharger install instruction. They don't make sense in some places, but this is what I learned...I think.

Brake booster line that connects to the stock intake F-connector: plug it shut.

One way check valve between the manifold and gas tank vent solenoid.

Uncap a vacuum nipple(there from factory?) on back of manifold and run vacuum/boost from that. Connect this to BOV and FPR.

However since I will be running more lines than what a supercharger runs, I will need a vacuum block and divert from there. Hoping the nipple that is noted is indeed there so I don't need to drill a hole in the intake.
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Old 03-09-2016, 01:29 PM   #11
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What engine? Any stock plastic manifold is typically not great for boost
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Old 03-09-2016, 01:32 PM   #12
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Quote:
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What engine? Any stock plastic manifold is typically not great for boost
M54 intake is developed for 8 bar pressure peaks...
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Old 03-09-2016, 04:10 PM   #13
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What im going to end up doing is using the vacuum nipple on the intake manifold (number 1 on picture) and hooking that up to a vacuum block. From the vacuum block i can connect up to 6 hoses....
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Old 03-09-2016, 04:23 PM   #14
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Yes there is a niple on the back of the intake manifold.

I've been thinking about the position of the pressure port for the fuel pressure regulator. If it is connected to the intake manifold, the engine at idle should be running too lean (with original map). Because of the pressure difference before and after the throttle.

I got this today checked at my supercharged engine and actually it runs in idling a little too lean. I haven't tuned it yet.
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Old 03-09-2016, 04:24 PM   #15
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Sweet, yeah that is the nipple I saw in the AA directions.

Seems like a vacuum block is just what the doctor ordered.

So with that setup we only need a check valve between the fuel tank vent solenoid and the manifold, and then were all set.

Mint!
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Old 03-09-2016, 04:26 PM   #16
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Quote:
Originally Posted by jd improved View Post
Yes there is a niple on the back of the intake manifold.

I've been thinking about the position of the pressure port for the fuel pressure regulator. If it is connected to the intake manifold, the engine at idle should be running too lean (with original map). Because of the pressure difference before and after the throttle.

I got this today checked at my supercharged engine and actually it runs in idling a little too lean. I haven't tuned it yet.
With adjustable FPR you should set the fuel pressure at idle with the vacuum line to the FPR nipple disconnected. When you reconnect it will automatically adjust for the conditions inside the manifold. Should help your lean problem.
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Old 03-09-2016, 04:53 PM   #17
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Well I actually have no real lean problem. I know where it comes from.

I just wanted to comment that there is a difference in the absolute fuel pressure at idle, if the pressure regulator is connected before (original NA setup) or after the throttle (FI setup). But with closed throttle the manifold pressure will be the same in both setups.
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Old 03-09-2016, 05:57 PM   #18
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Also according to hobbit, "Don't worry about the booster line, it already has a check valve in it. Ditch the purge valve and plug it. There are a couple lines on the back of the manifold, use those for your bov, fpr, boost gauge,ect. Plug what you don't need."
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Old 03-09-2016, 06:29 PM   #19
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Also according to hobbit, "Don't worry about the booster line, it already has a check valve in it. Ditch the purge valve and plug it. There are a couple lines on the back of the manifold, use those for your bov, fpr, boost gauge,ect. Plug what you don't need."
Great info, thanks.
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Old 03-28-2016, 01:32 AM   #20
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Bumping this thread, has anyone found a way to keep A/C with a top mount manifold?
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