S650 is there no actual oil temp sensor?

[Skye]

Is rpm inferred as well?

No. There is at least one sensor directly supporting RPM measurement: the Crank Position Sensor. The attached photo highlights its location.

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[Zig]

No, there is at least one sensor directly supporting RPM measurement: the Crank Position Sensor. The attached photo highlights its location.

Would an oil pressure temp sensor be outside of the possibilities?

 

[Skye]

Would an oil pressure temp sensor be outside of the possibilities?

One sensor which measures both? It's possible I suppose. There might be some manufacturers out there now using such a sensor. I like simple: one sensor for each reading (oil pressure and oil temp), both independent of one another. One sensor fails, I still have the other. Neither can interfere with the other.

From Ford's perspective, they probably removed a dedicated oil temp sensor for cost and QC. If you're producing millions of engines a year and determine most drivers don't need a $1 part, you save millions. One less widget is one less item that can leak or fail.

From the Driver's perspective however, accurate data and correlation of events is everything. As we're seeing in the comments above, while some are witnessing accurate readings, others are not. Pushing the car to the limits, it's best to confirm where that limit is before exceeding it.

 

[roket]

Great info. I can confirm after installing a thermalcoupler with the oil cooler, the temps are 25-30 degrees cooler than what is displayed on the dash. I installed the OEM PP oil cooler, radiator, and front brake ducts back in December and have monitored the temps closely since the install. Really want to get the issued resolved as I enjoy track days in Daytona and Sebring. The question now is how do you change the algorithm to reflect the addition of the OEM oil cooler on non-PP cars? Is there something in FORScan data or is it a PCM flash update? If it's a flash update, my guess is Ford will not be very cooperative.

one thing worth noting is the actual calculated oil temp does in fact use the existence of the performance pack oil cooler to change the calculation. as far as i know, the only way to correct the difference is to program your PCM with the firmware from a performance pack model. i checked a few vehicles and it looks like few or no modern Fords actually have a real oil temp sensor

 

[Guido]

My 24 nonperformance pack 6 spd GT will routinely show 230 degrees when cruising on the highway at 80ish. Seems the normal temp as displayed. CHT is around 205 normally. Inlet air temp is within 1-2 degrees ambient on the highway. When I upped the cruise speed to 90ish the temps dropped about 10 degrees. Temps for both drop 10-15 degrees when the AC is turned on. The engine coolant gauge sits in the middle of the normal range when all is warmed up.

 

[keithwalton]

Would an oil pressure temp sensor be outside of the possibilities?

Combined sensors are common and readily available. The clue will be in the number of pins on the connector. However could vary.
2 for passive pressure sensor or active sensor that uses engine ground. 3 for active pressure sensor or combined passive pressure and temperature. 4 pin and it's active pressure and temperature.

The crazy thing is thermistors cost pennies (cents) and the software required to infer the values probably cost more than a sensor on every gen 4 engine they'll ever build.

You would of thought the intelligent oil life monitor would factor in sustained high oil temps, but then a level sensor would also come in handy for life monitoring. Or a dipstick that wasn't directly below a strut brace that gets almost as hot as the engine.

For ref the cylinder head temperature sensor is a bit of an odd one in that it doesn't read below 60C, whilst on a cold start the oil temperature does read ambient and lags behind cht which lags behind water temp.

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