:driving: Turbo Boost Gauge readings

[RETed]

Vacuum reading don't really matter except for maybe at idle.
When driving, when you see vacuum on the gauge, it just means the turbo isn't working to produce boost.
Trying to see your vacuum numbers while driving is a royal waste of time.


-Ted

[nvno1]

Originally Posted by RETed

Vacuum reading don't really matter except for maybe at idle.
When driving, when you see vacuum on the gauge, it just means the turbo isn't working to produce boost.
Trying to see your vacuum numbers while driving is a royal waste of time.


-Ted

Wow Ted, i feel so honored you replied on my post. I'm not driving the car right now, my main reason for asking about the vaccum is the idle is not set and i wanted to know if at 1000rpms, if the reading is right? I have checked for vac leaks and nothing has surfaced, however i dont have another way of verifing there is no leak. So i figured the vac reading on my boost gauge would fall as a back up.

[vex]

Originally Posted by nvno1

Wow Ted, i feel so honored you replied on my post. I'm not driving the car right now, my main reason for asking about the vaccum is the idle is not set and i wanted to know if at 1000rpms, if the reading is right? I have checked for vac leaks and nothing has surfaced, however i dont have another way of verifing there is no leak. So i figured the vac reading on my boost gauge would fall as a back up.

Ah, the mysterious missing vac leak, where you know you have one, but just can't find it.

Try to get a smoke machine. That should show you exactly where your vac leak is. I am in the process of doing this, but have a few things to do first before I do (mainly earn money).

as for boost and vac readings. Are you sure your gauge is grounded properly? Not having a proper ground will give you very messed up readings. If you have, expect to have anywhere from 14-20+inHg in vac. I'm currently pulling in around 14inHg on a fresh rebuild (though compression is absolutely fine). Good luck though.

[nvno1]

Originally Posted by vex

Ah, the mysterious missing vac leak, where you know you have one, but just can't find it.

Try to get a smoke machine. That should show you exactly where your vac leak is. I am in the process of doing this, but have a few things to do first before I do (mainly earn money).

as for boost and vac readings. Are you sure your gauge is grounded properly? Not having a proper ground will give you very messed up readings. If you have, expect to have anywhere from 14-20+inHg in vac. I'm currently pulling in around 14inHg on a fresh rebuild (though compression is absolutely fine). Good luck though.

Hey thanks for the info. The gnd is good but my Vac readings are not that high(if memory serves me right). With the smoke machine the smoke will be inserted to a opening in the intake somewhere and pressurized through the system with the vac leak showing up by means of escaping smoke?

[vex]

Originally Posted by nvno1

Hey thanks for the info. The gnd is good but my Vac readings are not that high(if memory serves me right). With the smoke machine the smoke will be inserted to a opening in the intake somewhere and pressurized through the system with the vac leak showing up by means of escaping smoke?

Not quite. With the engine running (and you're reading low on vac) start the smoke machine. Point the stream over the engine and look for locations where the smoke enters the engine where it shouldn't be. Gaskets, Hoses, connections, etc are good places to look.

[nvno1]

Originally Posted by vex

Not quite. With the engine running (and you're reading low on vac) start the smoke machine. Point the stream over the engine and look for locations where the smoke enters the engine where it shouldn't be. Gaskets, Hoses, connections, etc are good places to look.

Iknew that. not really..so like i was messing with the car somemore and my Hg reading are a lot lower than what i thought it was like -5@1100rpm and at 3-4000rpms the reading is about -14hg. diffy a vac leak somewhere. my oil pressure is reading good, temp is cool, when i press in my tps the rpms climb. i got it on video but my wk pc doesnt have a dvd player, i get my mgr to load i and send it to me email so i can post it.