vacuum port priorities?

[compression]

Ok so , there are 4 ports on the underside of the manifold, i have : Afpr, bov, wastegate, boost gauge, gm map sensor, and the brake booster. I understand you want your sensor to have its own designated hose, so it does the brake booster does as well, that leaves afpr, bov, wastegate, and gauge. would it be ok to tie afpr/wastegate and bov/gauge? or vice versa, afpr/bov gauge/WG. should some of these have their own designated line?

 

[turboglenn]

Here's how i have mine setup.

BOV off port closest to PCV on intake manifold (1g manifold)

FPR, Boost Gauge (and in my case the feed to the electronic boost controllers internal boost sensor - this is not used to control the boost only as a reference) These are all pulled off OEM FPR port

Brake booster gets a "T" in it before the check valve, this "T" goes to the MAP sensor

Now that leaves wastegate, you can "T" this off the BOV, or the better way to do it is to run it off the port that's usually on the turbo compressor housing (or you can drill and tap the housing for a fitting yourself if you like) The wastegate and boost controller usually don't need or aren't supposed to see vacum, so putting this one on the compressor cover port is exactly how it's meant to be (ever see turbos with the line coming out of the cover and going right around to the port on the internal gate's actuator?

The reason it's important to have a dedicated line to the MAP sensor is because when tapped off the BOV, wastegate or other things that have a diaphram in them that moves is that it will give erratic signal to the MAP sensor causing you to have weird little stumbles when coming to a stop and the bov moves and settles with the vacum, and when wide open the wastegate actually opens and closes rapidly (not fully) but it does fluctuate, at least when using electonic boost controller based on PWM signals.

I have heard some say not to tap the MAP off the brake booster but the haltech pulls 180 frames of datalogging per second and i've never seen an issue with signal spikes or fluctuations running my MAP from there. When hooked to the BOV, or wastegate they are plain as day on the logs.

You can also run the MAP off a "T" to the AFPR, you can share it with the boost gauge as well (all 3 at once)

then you just have the BOV and WG, and like i siad earlier you can run them off the same port usually (i haven't experienced issues with it but it's a lot of vacum line to hook them together so i don't)

HOpe that takes care of any quetions or issues you have

 

[compression]

i forgot a check valve in my booster line.. i've got to find a place to get an inline check valve. Yea, im accually running a jmfab race smim, which has four ports on the bottom ( same shit though ). my compressor cover doesnt have a fitting on it, but i believe theres a spot for one. is this where i should tap?

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[99gst_racer]

^^^ Yup. Drill and tap there, or weld a bung to the LICP.

 

[1990AWD]

Wastegate - source off compressor housing
BOV - dedicated line
Brake booster - dedicated line
MAP - dedicated line
AFPR/boost gauge - use the same source.

That's how I would do it.