how do I read the boost gauge correctly

[pcpower]

topic

I understand from 0 - 25 PSI obviously, but what are the numbers below zero or almost 'negative' numbers which are measured in inHG (inch of mercury).

my car is around 20 inHG when idling, 1 PSI when the car is turned off, and anywhere from 1 - 20 PSI when giving the car some decent power.

thx

(breakn)

 

[JCell]

Negative is vac. basically your car runs in vac until the turbo is able to compress enough air past 1 bar.

20 vac at idle is right. as you approach zero, which is WOT for N/A cars, you begin building boost thanks to the turbo

 

[BillTheCat]

Yep, that's pretty much the end of this thread. lol

 

[rmgedon69]

normally, it should be reading 0 when the engine is off. don't worry though. it's typical prosport characteristics.

 

[CBMrocket]

basically your car runs in vac until the turbo is able to compress enough air past 1 bar.

and then she switches from suck to blow

 

[Kain]

normally, it should be reading 0 when the engine is off. don't worry though. it's typical prosport characteristics.

larf.

 

[808MP5]

and then she switches from suck to blow

An that's when we start ludicrous speeds

 

[i8urgti]

Good topic for a thread, should be stickied to prevent repetitive threads.

 

[pcpower]

Good topic for a thread, should be stickied to prevent repetitive threads.

(iagree) i'm just happy I didn't get flamed for asking a fairly simple question. thx for the responses