Boost Gauge Problem?

[Aaron]

Hey all I was looking at my gauge today on the way home and at WOT my gauge will spike to 7 psi and fall to about 5.5 psi. I am all stock right now. I noticed that the needle will start vibrating at around 6 psi. What could this be?

fault gauge?

vac still reads steady and normal with a/c on 21-20.

turbulence problems?

[rocketspeed]

What kind of gauge? The fall-off in boost as RPM's rise is universal- I've heard a few explainations from the plastic pipes to the restrictive exhaust. Who knows, but its universal.

The shaking gauge needle is also common for whatever reason- I can't figure it out. I'm on my 2nd Autometer, both shake.

[Aaron]

yeah I have the autometer ultralite gauge. It didn't do it before and just noticed it today. Vacumm is steady. Really weird. I will check hoses tomorrow after work.

[srtchick]

sounds normal.

[lamp3]

my vacume reads about 22 then if i kick the a/c on it falls to about 18 or 19...

[Aaron]

i not worried about the boost dropping. I am worried about the boost needle shaking vibrating at WOT. never has done this before???

thanks

[FSDET]

get a electronic gauge the needle wont vibrate.
the boost drop is due to exhaust and plastic IC pipes.. maybe even from the SMIC itself

[lamp3]

could be caused by the waste gate opening up. the exhaust where the waste gate dumps is a VERY shitty design and cuases alot of turbulence...

[mspeed101]

could be caused by the waste gate opening up. the exhaust where the waste gate dumps is a VERY shitty design and cuases alot of turbulence...agreed

[dominoy2k1]

get a electronic gauge the needle wont vibrate.
the boost drop is due to exhaust and plastic IC pipes.. maybe even from the SMIC itself
better yet get a digital one. who needs needles anyways.