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Low oil Pressure indication

H

HUMBY

New member
I recently took delivery of a new 2019 Macan S petrol and noticed that the indicated oil pressure at idling appeared low e.g. 1.4 bar with a cold engine. This oil pressure remained close to 1.4-1.5 bar when the engine oil was hot (95 Deg C) @ approx 2000 RPM. There were no fault indications therefore I returned the vehicle to my local Porsche dealership (Bournemouth) for their comment. Several other new Macan V6 engined Macans were checked at the dealership and their oil pressures were identical to my experience. I could not get any explanation from the dealership and was given the number of the Porsche Customer Assistance Centre in Reading. They could not give me an instant response but did contact me next day to state that their senior Technician stated that the oil pressure on this type of engine is monitored and controlled by an electronic control called the DME, therefore the oil pressure is increased as the load on the engine increases, and is not only influenced by oil temp and engine revs alone.
As an engineer I find this control methodology very interesting and I asked if further clarification could be obtained that I could share with the Register. Their reply was this information is confidential to Porsche AG and could not be divulged!
Has other Macan owners observed this and can anyone throw further light on this control mechanism? I would be very interested in understanding how the oil pump can increase pressure electronically (unless it is electrically driven) ?
Steve
 
The DME (Digital Motor Electronics) or ECU receives input signals from numerous sensors dotted around the vehicle and uses relevant information to govern the demand-controlled oil pump.
Regards,

Clive
 
Thanks for that Clive, is the oil pump driven mechanically or electrically, if mechanical it must have some type of electrical solenoid that can influence the output pressure. Is this methodology used on other high performance engines.
My 911 (997 series 1) is pretty constant at 5 bar at 3000 rpm and 95 deg C so I assume it has the older style pump with a mechanical pressure release valve.
 

HUMBY said:
Thanks for that Clive, is the oil pump driven mechanically or electrically, if mechanical it must have some type of electrical solenoid that can influence the output pressure. Is this methodology used on other high performance engines.
My 911 (997 series 1) is pretty constant at 5 bar at 3000 rpm and 95 deg C so I assume it has the older style pump with a mechanical pressure release valve.
Click to expand...


997 series 2 was a big change in engine design and the start of computer controlled oil pressure.
 
Thankyou gentlemen for a concise explanation of the functionality of the oil pressure system fitted to the latest generation of Porsche Engines. Your prompt answers confirms the importance of our register for all issues concerning our Porsche cars.
 
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