I had a look at the UPR check valve on their website here:A PCV valve is a little more involved than a simple open/closed check valve
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It’s a zero psi crack pressure check valve meaning there is no spring in the valve body.
The position of the PTFE ball inside is going to be based solely upon the pressure differential across it.
So the check valve is going to give you maximum flow out of the crankcase, or no flow at all.
When you have a large pressure differential across the check valve but only need to bleed a small amount of blowby gas out of the crankcase (at idle for example), the check valve will move to the completely open position and vent more gas than is necessary. This is why Radium is saying that using a check valve instead of a PCV valve will give you a “vacuum leak” at low loads.
The PCV valve has a second spring in the valve body to allow a small flow of blowby gas at idle.
I can see that the tune plus website appears to show gutting the OEM PCV and using a check valve as a possible solution to high crankcase pressure and smoking issues. I don’t understand why they would recommend doing so when they also sell the radium PCV valve & baffle kit? Am I missing something, or interpreting it incorrectly?
YOU MUST MEASURE YOUR HOSE BEFORE ORDERING! This is a necessary upgrade to your UPR catch can system if you are running over 22psi. The included checkvalve in the UPR kits work great but overtime can break down and fail to hold boost from entering the catch can. We have found it a great upgrade...
They also mention gutting of the oem PCV and using a check valve in the “my car smokes after exhaust changes” FAQ section here:
Do I need anything to run E30/E85? For E30 you do not need to change anything but the tune on the car. However we will not tune an Ecoboost Mustang without an upgraded intercooler. Other vehicles we support intercooler's are OK but can heavily benefit from being upgraded. The biggest benefit of...