Flamenco-T

so far I have 2 vacuums tap in the FPR and 4 on the EVAP purge valve..
is there another vacuums source? I don't want to tap too much in one source, especially on the FMU since it's kidna sensitive reading the boost and fuel press. and etc..

stan

dbman96

Try the brake booster vacuum source comign off the top of the intake manifold; it's about 2x the size of the rest and works like a charm as long as you tap it BEFORE the check valve that's mounted to the firewall.

Farnsrocket

Can tapping into one source with too many things affect your setup?????

Flamenco-T

I would think so, since for example, if you tap in too much on the FPR lines, the FMU will read less vacuum than the turbo is actually producing, therefore will create less fuel pressure than it should...

same goeas for WG and etc...

someone please correct em if I am wrong...

stan

dbman96

I would worry about it particularly with something like an adjustable FMU that has a bleeder on it to vent some boost pressure - that might affect the boost pressure read by other devices on the same line. Likewise a blowoff valve can use a pretty good volume of air in opening its valve chamber, and I found that my BOV response was WAY quicker when I tapped it off its own vacuum source.

Ray

Ditto

or

you can tap a bunch of holes in the manifold.

Tomakit

There was a discussion about tapping too many things to one vac source on another board awhile ago. iirc, the general consensus was that its not too bad to tap multiple things off of a single vac source. also, the readings will not be affected because there isn't enough vac to go around...(did that make any sense, or did i just complicate things more, haha )

when i had my turbo i tapped everything, and i do mean everything: BOV, wastegate, boost gauge, fmu, boost controller...to the stock fmu vac line, and had no problems what so ever.

lemme dig around for that post, maybe it can help clear some stuff up.

Tom

GruvyTune

I've got everything coming off a 5 way T on the fuel regulator line and I read nice steady vacuum. If everything is done right and there are no leaks, its a closed system and does not matter where you tap off of.


torin

Tomakit

(copy)I've got everything coming off a 5 way T on the fuel regulator line and I read nice steady vacuum. If everything is done right and there are no leaks, its a closed system and does not matter where you tap off of.(copy)

that's what i meant...hahaha, thanks.

Tom

GOLDBERG

can someone post a pic of the purge valve and where to tap it??thanks

GOLDBERG

up

DC2

Hey Stan why do you need more than those two sources? I wouldn't recommend tapping the brake booster

Deltax75

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DC2 &raquo;</TD></TR><TR><TD CLASS="quote">Hey Stan why do you need more than those two sources? I wouldn't recommend tapping the brake booster </TD></TR></TABLE>
If i remember correctly, doesn't GEM's vacuum manifold use the brake booster's source as its feed. But i know where you're comin from, thats what the "E" brake is for
-Mike

SiRkid

this is freaking old..holy crap

Pat

on their diagram, doesn't GE use the intake manifold as the feed?

Flamenco-T

holly ****..this is old hahahaha

I tapped all my vac sources on my intake manifold. I drill and tap 4mm barb fitting and run all my vac sources from there..

stan