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

Foxfan88

My Grandpa has great wood.

Sep 13, 2004

2,487

4

0

Miami, Ok

Sep 9, 2007

#1

• Sep 9, 2007

• #1

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.

 

D

Djstorm100

Member

Aug 5, 2007

109

0

16

Sep 9, 2007

#2

• Sep 9, 2007

• #2

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


is it electirc or is it mech guage?

 

BLOWN 5.0 FOX

Member

Apr 4, 2005

213

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16

NORTH SHORE MA

Sep 9, 2007

#3

• Sep 9, 2007

• #3

sounds like compressor surging

 

kbeefy

New Member

Aug 12, 2007

29

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0

Sep 9, 2007

#4

• Sep 9, 2007

• #4

BLOWN 5.0 FOX said:

sounds like compressor surging

Click to expand...

^^ 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

My Grandpa has great wood.

Sep 13, 2004

2,487

4

0

Miami, Ok

Sep 10, 2007

#5

• Sep 10, 2007

• #5

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

Member

Apr 4, 2005

213

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16

NORTH SHORE MA

Sep 10, 2007

#6

• Sep 10, 2007

• #6

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

My Grandpa has great wood.

Sep 13, 2004

2,487

4

0

Miami, Ok

Sep 10, 2007

#7

• Sep 10, 2007

• #7

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

New Member

Feb 3, 2004

652

0

0

Converse, TX

Sep 10, 2007

#8

• Sep 10, 2007

• #8

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

 

Foxfan88

My Grandpa has great wood.

Sep 13, 2004

2,487

4

0

Miami, Ok

Sep 11, 2007

#9

• Sep 11, 2007

• #9

got it ordered last night