I have an autometer boost gauge on a crx b20 turbo, it shows about 20 vac at idle, but when I press the gas too the floor it goes straight to 0, I can hear the turbo spooling and everything can someone help, I tested the gauge and it works fine

 

is it actually building boost? what rpm are you at? what turbo? where is your gauge connected?

 

Where do you have the sensor connected, if I had to guess I'd say in the brake booster line after the check valve... which is why it shows vacuum and not boost

 

Dont put it before the check valve on the booster, also don't "T" off of the fuel pressure regulator.

 

You are either sitting still and revving the engine and it won't build boost unless you have anti lag setup OR you've got a boost leak. Either way it sounds like this is and FMU or basemap setup ready to go kaboom then the question will arrise why did my motor blow.

 

lol

 

like Turbo LS said if your engine isn't in load they will not build boost.

Take it out of the garage and test it.

 

Whether I'm going or staying still it moves with the gas pedal, no gas=20 little gas it stars going to ten then full throttle it goes straight to 0, I'm not sure if it is hooked up to the right vacum hose. So which hose to I connect it to?

 

Then where is the best place to pit it without tapping directley to the intake manifold

 

directly to the intake manifold

 

Definitlly on intake mani or vacuum manifold. Straight to the guage to ensure no interference. Are you still pulling hard during these symptoms? Check for boost leak if this is happening.

 

the only thing you cant run off the fpr T is a blow off valve. boost gauge will work fine. if the car was put together properly youll hear and feel the spool AND see some positive pressure on the gauge. sounds like you got an NA car lol