What makes the IPCV valve ingenious is that it re-routes the various high and low pressure feeds through a clever internal piston system. When the throttle is opened and the car is accelerating, boost pressure generated by the turbocharger will ensure that whichever dump valve or recirculation valve you have fitted will be kept sealed. As no boost is now being lost through the intercooler (which can usually be anywhere between 1-3 psi of boost drop) the pressure acting on top of the piston of your dump valve is precisely equal to that underneath it. The result? Only a relatively weak spring is required to keep it operating, which means response times can be kept quick and throttle response is immediate.
This Part Fits the Following Vehicles
|Volkswagen||Jetta IV GLI||All||1.8T|
|Volkswagen||Passat B5||4 Motion||1.8T|