I don't think you need a system pressure regulator. I agree with the previous post, if the system pressure really was 1 bar the engine wouldn't run. This may be a measurement error. Before putting in the pressure regulator I would measure the output of the pump, both pressure and volume tests, then re-run the system pressure test.

Once the system pressure is verified OK then and only then will the control pressure test be meaningful. Control pressure should be in the range of 3.1 to 3.5 bar (engine warm).

If the control pressure is low with engine warm then your warmup regulator will probably have to be replaced. It's possible to adjust the wamup regulator but the range of adjustability is very small. If the control pressure is 1.2 bar with the engine warm then your chances of a successful adjustment are very low. If your control pressure is a few tenths low then your chances are better. Remember that your car left the factory with the control pressure just right. If it's low now that means that something is wrong, usually (but not always!) with the warmup regulator itself. That's why our company makes lots of warmup regulator upgrades.

BTW, if the control pressure really is 1.2 bar then DON'T run the car for an extended period of time. We lost an engine in one of our test vehicles due to scuffed cylinder walls because of this problem.

Steve
UnwiredTools Support Team
www.unwiredtools.com