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Oil pressure drop

Practical Engine Building

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Hi HPA, I have a GT86 too with the same problem, I tried adding a baffle plate (from TMG) and using an uprated oil pump in order to increase the oil flow and so the pressure. I still have drops until 0.9-1bar over 4000rpm (should have at least 2-3 bar). I would like to use a 10w60 oil but the engine supplier advertise me against it due to bearing clearances, so I'm using 0W20 as they advertised (IAG).

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Do you have the logs from tr86 in order to have a reference?

Considering the duration of the surge is 0.4-0.8s and (correct me if wrong) the pressure sensor location (as OEM) is before the oil filter it is possible that after the filter you would probably measure a drop too but not so deep?

Have you ever tried to measure in a different location?

NOTE: lateral force are around 1.5G (slicks), log freq is 50Hz with AIM sensor and datalogger

From my experience with the FA20 in race series usage, i would not be using a 0w-20 oil. In cooler (less than 25 degrees ambient) conditions I would recommend a 10w-30, and in higher ambient temp a 10w-40. When the oil temperature goes over around 105 degrees with a 0w-20 there is not enough pressure to properly control the Inlet Cam Bank 2 position. As this is the cam that drives the DI pump, there is more load on it than the other cams, and it tends to lag the aim by a fair amount.

Before mounting the IAG block I ever used a 10w60 oil (I have around 40l in stock), could it really create problems due to tight bearing clearences or should a good warm-up of the engine be enough before moving the car?

Thanks for the support

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