pd-Elements Adjustment: 225° vs. 180°

Hello everyone,

I have a question about setting up the PD elements!

I understand the adjustment process so far, but I would like to have more background information regarding the new adjustment specification from VW, which involves loosening the 'pre-tension screw' on the roller pivot lever by 180°.
It was 225° before.

Perhaps I'm wrong, but in my opinion, I achieve the same result by adjusting the timing of the camshaft earlier. Because the camshaft position has now been changed, the pressure inside the PDE is higher.

In the case of extreme early injection timing or tuning modifications (where the injection duration is extended), it can happen that at high engine speeds, fuel should still be injected, but a pressure loss in the high-pressure pump (PDE) is already expected. This means that the maximum displacement of the camshaft has been exceeded. This results in lower injection pressure, reduced efficiency and combustion, as well as decreased torque and, ultimately, a loss of power.

'In my opinion, these disadvantages of pressure drop could be mitigated by setting the PDE (pressure drop equalization) to 180°.' This implies that a smaller injection volume in the PDE is also required!
Isn't that more of a disadvantage then? (e.g., lower leakage losses for cooling the PDE and perhaps even a lack of power). Or am I mistaken?

What benefits can be expected?

Has anyone changed the settings and can share their experiences regarding the engine characteristics before and after the change?
I am particularly interested in the consumption trend, the before-and-after comparison!

Best regards,

Ferdi.


See also:

/viewtopic.php?t=5408&highlight=pde+180

... More recent VAG guidelines specify that the adjustment screw should only be turned out by 180 degrees instead of 225 degrees. This applies to all PD engines, even if a different setting of 225° was previously specified for the same engine.

and also...

/viewtopic.php?t=11725&highlight=180+setting