under boost at high rpm, boost needle shakes fast, any ideas?

[Foxfan88]

been working on my car had some running issues, got it running decent and got a good pull on the back road. the powerpipe i installed works real well it seems

one time in 2nd gear i was turning maybe 5400 or something, its was up there and i made about 7 psi but the needle started shaking, going up and down about 2 psi really fast.

could this be valve float or something, because i dont feel anything, just the needle on the boost gauge shakes violently. only happened once so i am not sure.

but i could tell a difference with the boostmaster pipe, the car was hauling ass.

 

[Djstorm100]

whats boostmaster pipe suppose to do? or the powerpipe? link


is it electirc or is it mech guage?

 

[BLOWN 5.0 FOX]

sounds like compressor surging

 

[kbeefy]

sounds like compressor surging

^^ yeah. My truck does that under heavy load. Does it make any noise? Sound like a turkey?

If it's surging, it's stalling the intake airflow and creating a shockwave, basicaly your cavitating your impeller.

 

[Foxfan88]

any way i can stop it? i dont hearing anything i dont think...

and the boostmaster pipe is the same as a power pipe, its pretty much a cold air tube for the blower

 

[BLOWN 5.0 FOX]

poss defective and or poor vac to your bypass valve... if your using one...if your not... get a bypass valve. Basically when your throttle is shut aka shifting etc, the boost has no where to go but "back" to your compressor creating pressure in the discharge pipe. A bypass vents that pressure to before the blower which in turn recycles the air without creating pressure. Good luck!!

 

[Foxfan88]

i dont have a bypass, i guess it is surging, i didnt realize this.

but it seemed like it happen before i shifted maybe i was shifting i duno

 

[TheBocSez]

If your seeing over 5-6lbs, a bypass would be a good investment for you.

 

[Foxfan88]

got it ordered last night