Boost gauge question?

[ryno]

I was just wondering what an aftermarket boost gauge should be at in neutral at idle, while driving and not under any load, and while the car is off.

Mine righht now is at -10 in idle, -20 while driving whilet not under any load, and 0 when off.

Are the numbers supposed to be all weird like that?

thanks

 

[ECLIPSE4x4]

-10 like as in negative 10?

Either way, those numbers are wrong. Is this a new gauge or used? Did it just start acting this way or acted like this the first time afetr install?

 

[GSX93DSM]

I know at cold mine holds about 20 and then drops to about 16 when warm

 

[ECLIPSE4x4]

I know at cold mine holds about 20 and then drops to about 16 when warm

He said not at WOT or under load.

 

[Highwayrun]

Your vacuum at idle should be at least 18 inHg.

Your vacuum/boost under no load should be around 0 inHg, but will vary in practice. Under deceleration, you should pull around 25 inHg of vacuum.

Your vacuum/boost with the motor off should be zero (0).

 

[Liquidus]

Other than 10 VAC on idle, everything else seems to be fine. I usually get around 18 VAC on idle. Depending on how I'm driving with no load, 20 VAC seems fine. With the engine off, the boost gauge should go to 0.

 

[ryno]

-10 like as in negative 10?

Either way, those numbers are wrong. Is this a new gauge or used? Did it just start acting this way or acted like this the first time afetr install?

It was on the car when i bought it, it is a faze boost gauge. Only owned the car for a week. Im a real noob when it comes to turbo stuff.

When I sit in idle it reads 15 on the bottom numbers of the gauge, is this negative 15?
then when i give it gas the needle will go up to about 8-10 in the bottom numbers, then go back down to the 15.

It does sit at 0 when car is off.

And goes up past bottom numbers and past zero to the top number around 15-18, when i hit boost.

Just wondering if this is normal?

thanks

 

[MrBoxx]

On a boost gauge, anything below zero is vacuum, which is measured in in/Hg, which stands for inches of mercury. Anything above zero is boost, which is measured in psi or sometimes bar.

It sounds like your gauge is acting more or less normally, but check all the hoses to make sure you're not leaking anywhere just to make sure. If you're at 15 in/Hg at idle, that's pretty close to normal. I think mine rests at 18 at idle, like Liquidus and Highwayrun said.

 

[ryno]

On a boost gauge, anything below zero is vacuum, which is measured in in/Hg, which stands for inches of mercury. Anything above zero is boost, which is measured in psi or sometimes bar.

It sounds like your gauge is acting more or less normally, but check all the hoses to make sure you're not leaking anywhere just to make sure. If you're at 15 in/Hg at idle, that's pretty close to normal. I think mine rests at 18 at idle, like Liquidus and Highwayrun said.

Ok thanks for the clarification. I started to get that after I read this thread a couple times.

THANKS