Turbo spool is dictated by the wheel size I choose, the turbo design (I use mostly twin scroll now) and my timing and boost ramp calibration.
You will not see anyone find telemetry data that identifies difference in spool on these oils discussed. And we are talking about 100 samples per second of telemetry data not being able to see it.
I'd sincerely be interested if you have any though. I've simply never seen anything like you are describing so I'm open to your data
I asked about fuel flow. Are you saying that there's no difference in the amount of fuel delivered to reach a specific rpm within the same amount of time regardless of HTHS? This would be news to the automakers worldwide.
From Lubrizol
LINK
"Long haul heavy duty commercial vehicles can realistically expect fuel savings of 0.5-1.5% by switching from SAE 15W-40 to 5W-30 HTHS engine lubricant. Further savings when switching to low HTHS viscosity engine lubricant can be expected to add 0.4-0.7% of increased fuel efficiency, depending on the engine type and operating conditions.".
Total FE savings from a 40w with HTHS of 3.5 or higher to a 30w sub-3.5 hths could be anywhere from .9% - 2.2%.
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