Why does my dump valve not open properly?

A

Amd1691

Member +
Ok guys
Issues is that boost is consistent and normal
There are no boost leak or whatsoever, i have double checked both bov and intercooler tubing but its all fine .
So what can cause my bov to open only halfway to relieve the pressure?
 
dac69er

dac69er

Super Moderator
the tightness of the spring. when you are looking at how far it opens is this on a rolling road with a load on the engine or just in neutral? if it is in neutral then i wouldnt expect it to open much with little load on the engine.
 
markostarletturbo

markostarletturbo

Member +
If it's a baileys bov throw it in bin and buy decent 1 greddy type s, blitz, hks, etc.... The baileys ones are rubbish mate
Some bov's are adjustable and have a nut on the back or top adjust it mate to suit
 
Last edited:
H_D

H_D

Member +
I had the same problem with my old baileys dump valve. If you undo the dumpvalve and grease the wall where the spring and piston sits it should be ok at the same time stretch the spring a little bit and it should be ok.
 
ramses974

ramses974

Member +
Amd1691 said:
Ok guys
Issues is that boost is consistent and normal
There are no boost leak or whatsoever, i have double checked both bov and intercooler tubing but its all fine .
So what can cause my bov to open only halfway to relieve the pressure?
Click to expand...

what is your Bov?
 
A

Amd1691

Member +
Bov is a group 4 diaphragm dump valve.
Was functioning properly till I had a service and then theres more compressor surge and less purge.
Spring is not adjustable.
 
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