Quote:
Originally Posted by SilverSurfer
The forge doesn't have a diaphragm just a spring and an alluminium piston. as mentioned you can get different springs and shims. They used to list a full kit for about a tenner.
It doesn't explain why it does it with a standard valve though. Its as if you have too much vacum on the engine side when the throttle is closed compared to the levels on the intercooler side of the throttle.
Did u check all the intercooler pipes and connections and breathers.
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It doesnt have a rubber diaphram but it has to seal the vac line area with the piston.
Ie. work like a diaphram. If you compress the piston and place your finger over the vac connection the vacuum created should hole the piston in place. If it doesnt then air will be sucked through the vac pipe or escape through the dump valve depending if on boost or not.
And the piston will open when it shouldnt.