Retarded boost

[Usatuff]

Any idea?
YouTube - VIDEO0006

Gauge is hooked up properly I can feel it build boost, hear it blow off but it won't og into the boost section, just stay in vacuum

 

[96 420a-t]

Possibly a bad guage. What kind of vaccum are you seeing at idle?

 

[98GSXtacy]

Seems like your gauge is toast man. Try using another gauge if you have one available and that will probably fix the problem.

 

[XiKeiyaZI]

Where do you have the line T'd? The most accurate spot that I've used has been the hose between my Intake Manifold and FPR.

 

[96 420a-t]

I noticed it is still in vaccum at wide open. Id look at the gauge for sure.

 

[Bluefire16]

Are you positive your are building boost?

Car smoke at all?

Check the turbo for shaft play and just make sure its not toast.

Lastly, a huge boost leak will cause you to build no boost. But then again, you say you "feel it" so its possible the gauge is junk or you make have a kink in the line.

 

[98GSXtacy]

It shouldn't be a boost leak or the turbo because if it was it should still be getting up to 0/0, like it was n/a, but it's only getting up to -10 which leads me to believe it's got to be the gauge.

 

[gofer]

Verify the boost gauge is working using an air compressor by doing a quick BLT.

1. Remove your boost gauge from the A-pillar
2. Pull the vacuum line off the wastegate and shove it into the back of your boost gauge.
3. Do a BLT, pressurizing the system, seeing if the gauge will show a pressure reading other than vacuum.

 

[niddydsm]

Make sure there is no kinks in the Gauge line and that its T'd in an accurate position. If your Feeling it build boost then doing a BLT would be pointless.

 

[gofer]

If your Feeling it build boost then doing a BLT would be pointless.

Apparently you didn't read the step by step I wrote above... I didn't suggest doing a BLT to check for boost leaks, I suggested he pull the gauge out of the car and hook it directly to the IC pipe and pressurize the system.

 

[xXEclipse]

Make sure there is no kinks in the Gauge line and that its T'd in an accurate position. If your Feeling it build boost then doing a BLT would be pointless.

You can build boost and still have a leak, it wouldnt be "pointless"

 

[Usatuff]

Gauge is at about 21~22 at idle. No leaks, gauge is new and has always worked until motor swap. I'm going to switch to vacuum line instead of that plastic crap soon. Thanks for the replies and I will try testing the gauge with my mighty-vac