vacum is at 18

[dsb97gst]

my vacum is at at when i am just cruing doing like 45 . i was wondering if this is right or should it be under ant bosst and showing atleast like 5lbs of boost?

 

[L2RTSiAWD]

That's fine.

 

[Tallen]

normally when you can hear the turbo, you should see boost

 

[Megaman]

yea, i get the same thing...when i'm not on wot or just cruisin aroung(lightly pressing on the gas), it stays on vac. but on wot and when the turbo spools is when u should see boost

 

[RedTurboEclipse]

thats normal.. i heard anyhere from 17-20 is normal.. i get around 16 when the car is first turned on.. and when its warmed up.. anywhere from 18-20..

 

[Megaman]

when your just cruisin aroung right?

 

[RedTurboEclipse]

yea.. when im cruising and not pressing on gas.. it will be on vac.. but once im on the gas.. and boost starts building.. then it goes to boost..

 

[Megaman]

hmm....i only get boost on wot or when the turbo starts to spool up...but when i just slightly press on the gas(like i mentioned before) it still shows vac no boost at all...

 

[MikeL]

http://www.howstuffworks.com/turbo.htm

http://www.howstuffworks.com/engine.htm

 

[RedTurboEclipse]

Originally posted by Megaman
hmm....i only get boost on wot or when the turbo starts to spool up...but when i just slightly press on the gas(like i mentioned before) it still shows vac no boost at all...

weird.. so even if you press the gas a lil it wont move out of vac? like at least to 0.. then when boost starts building then it will move to psi? thats how mine is..

 

[Megaman]

yea, i only get boost(psi) when the turbo starts to spool up or on wot...it gets to 0 but only when i press on the gas a lil harder.

 

[RedTurboEclipse]

wow thats interesting.. my gauge is active as soon as i press on the gas.. from just a little bit to a lot..

 

[Megaman]

first i thought there was some cracks on my ic pipes that made it leak but then i replaced it with greddy upper and lower ic pipes and still the same. someone told me to get higher octane gas (92+) but we only get 91 here in san diego.
it still shows boost on wot...but thats it

 

[RedTurboEclipse]

where did you connect your line from the boost gauge? i was reading a install guide on how to install a boost gauge the other day.. and it was talkinga bout 2 different places to tap the boost line.. and one of them wouldnt show vac.. so maybe thats why.. butdont take my word on it. and sorry i forgot which install guide it was.. if i remember ill link..

 

[Megaman]

i actually had my boost gauge profesionally installed...but if u remember the link, i'll check it out

 

[RedTurboEclipse]

here you go.. scroll down
http://www.roadraceengineering.com/instructions/vdoboostgaugeinstructions.htm

1. Tap the boost gauge hose into the hose that runs from the intake manifold to the solenoid that controls the fuel pressure regulator. This is the center solenoid on the driver’s side of the firewall. Remove the double-ended hose connector on the bottom hose of the solenoid and install the tee in its place.

Some prefer connecting to the "P" fitting on the throttle body. Using this connection will not show vacuum on the gauge. The reasoning behind going to the P fitting is that by connecting to the fuel pressure regulator, you run the risk of loosing pressure to the regulator should something happen to the boost gauge hose. The solution is doing a nice job of connecting the hose and keeping it safe. By connecting to the regulator, you will be able to see if the regulator is getting pressure. Nothing showing on the gauge, means nothing getting to the regulator. With the hose connected to the P fitting, you could loose pressure to the regulator and never know. We like the connection shown, it is your choice.