boost gauge is off center?

[tips000]

my boost gauge reads about 3 in. of vaccum when the car is off. would it be safe to say that when i hit 9-10 psi i am actually getting 12-13 psi?

 

[agarc023]

Probably, but I would look into replacing the gauge just to be sure

 

[MY1GDSM]

It's probably doesn't rest all the way back to Zero when the car turns off do to the actual atmospheric pressure??? Not everywhere on the planet at all times is exactly 100Kpa even a big low pressure system could cause it ...

I know I've seen mine rest a little off from Zero an it always matches up with my map sensor in logs.

 

[tips000]

It's probably doesn't rest all the way back to Zero when the car turns of do to the actual atmospheric pressure??? Not ever where on the planet is exactly 100Kpa a big low pressure system could cause it ...

thats a possibility, i guesse i never thought about that. i think the gauge needle is just bent a little or something though. 13 psi should be safe i think?

 

[Bud92gsx]

Wg pressure should be about 12psi..So even if your hitting 13 it will be safe..

 

[4Lurker4]

^^ I agree, WG initial set up will limit it (unless you're setting up a boost controller).

 

[forcdndukshun]

Most boost gauges reset back to zero. If it is an autometer it is probably off every one I have ever owned has been off after a few months.

 

[tips000]

It is an autometer. But I do have an Mbc.

 

[knochgoon24]

Atmospheric pressure shouldn't affect your boost gauge. It reads psig - aka. gauge pressure. It's the difference between your boost pressure and ambient pressure. With the car off, the pressure on each side of the gauge should be equal, so it should read 0 psi/inHg. If it doesn't, then it's calibrated wrong/broken.

 

[gofer]

I've noticed my Autometer 30/30 Phantom gauge will go above or below 0 with the car off if I twist the back of it with my hand. Just hold the face plate and turn the back a bit, you won't be able to completely rotate it but just enough to re-align the needle to 0.

 

[housegsx]

Both of my Autometer gauges have been off center. My current one reads 1-2 psi when the car is off. It's an Autometer thing.

It doesn't bother me because I just use the gauge as a reference point.