Vacuum meter won reach 0mmhg

[gggti]

How come my vacuum value won reach 0mmhg (at 100% throttle)?

This is the value shown in my SAFC2.

The current value is -53mmhg(sometimes-46mmhg) at 100%throttle,
and rpm is 7800.

My current setting throttle enlarge plus hi cam.

 

[gsrTurbo9166]

yo bro r u driving a turbo car or na car?
if i not mistaken
na car wil never reach 0 coz it cant produce force power (kilopascal)

 

[gggti]

But my fren s mivec can reach 0.
Also i read one article on net,it mention that a healthy na engine
should reach 0.

Anyone knows,pls share ur knowledge.

 

[GrimReaper]

i'm using a stock satria 1.3 wif vacumm meeter.when i 1st install it ..the meter was on 20-25..but now, for quite couple of mths oledi, whenever i step on accelerator fully, the indicator is on 0...n when i start engine,its on 8mmmg...wat does it means... meter on 8 when start, 5 on normal acceleration, 0 on full step on acceleration...any experts can tell? thanks

 

[sta]

what is a vacuum meter for?