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Boost gauge vacuum?

B

bigduck187

New member
Not real familiar with boost gauges let alone with a supercharger but my gauge reads 0 when I'm off the supercharger. Shouldn't it have a vacuum reading? I've talked to a couple old school guys who said they tuned their cars to a 0 idle reading. But I'm seeing pics of people with -20 vacuum!? I'm at a loss on this. What is the "proper" boost my gauge should be reading?
 


Follow the line to the motor. It should be connected into the line from the T under the snout. Whether it's up front or at the back, that's the line it should be hooked into somewhere. Any other place and it'll give you no vac
 


Im also fairly new to the install other than following the line to the snout can i use the fuses on the passenger side? How properly to do this?

Sent from my SGH-T989 using Tapatalk 2
 
A fuse won't help you with vacuum. Typically a boost gauge only wants a ground and the dimmer circuit for the light. Unless you are working with an electronic one.

It would help if we know what you were working with and which year car you had.
 
I'd post pictures...especially if you don't know what's going on.

This is why I say do your own work.
 
There's no such thing as negative vacuum.

Vacuum is read in kPa (kilopascal) and Boost is read in PSI (Pounds Per Square Inch). Zero is the middle mark, where neither exist.

To convert pounds per square inch to kilopascals(PSI to KPA), multiply the PSI value by 6.894757293168361.
To convert kilopascals to pounds per square inch(KPA to PSI), multiply the kpa value by .14503773773020923.
 
BillBoost37 said:
A fuse won't help you with vacuum. Typically a boost gauge only wants a ground and the dimmer circuit for the light. Unless you are working with an electronic one.

It would help if we know what you were working with and which year car you had.
Click to expand...

Sorry lol its a 2001 GTP as far as the dimmer circuit where is that located? Ground is the black wire near the front by the battery/passenger headlight right?

Sent from my SGH-T989 using Tapatalk 2
 


There are plenty of places to ground inside as well. Any piece of metal behind the dash will work for the ground. Trying to remember, I think the small yellow wire off the headlight switch is illuminination, or the grey one. Test those two and you'll have power for the light with dimming.
 
BillBoost37 said:
There are plenty of places to ground inside as well. Any piece of metal behind the dash will work for the ground. Trying to remember, I think the small yellow wire off the headlight switch is illuminination, or the grey one. Test those two and you'll have power for the light with dimming.
Click to expand...

Ok gotcha so i can use the interior harness those are on the passenger side or driver side sorry for endless ques.. Im not by my car right now...also i have glowshift 7 color series boost gauge can i use the dimmer feature with this gauge?

Sent from my SGH-T989 using Tapatalk 2
 
Hey guys thanks for the info and the help! Been too busy to visit the site lately but I will get some pictures posted tomorrow as I still haven't figured it out. The "T" under the snout is just that, a T. But I can't see where anything is going to the supercharger. One line is running to the nitrous module. Another to the fuel rail. I don't think that's the right "T" I'm looking for lol I have a 97 gtp
 


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